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Chapter 6 - Troubleshooting 

Confidential and Proprietary Information of ZTE CORPORATION 163 

Call Drop Rate in Cell Rises Suddenly 

1.

 

Symptom 
The call drop rate in a cell rises suddenly. 

2.

 

Source 
Find the fault in dialing and analyzing the performance report. 

3.

 

Related parts 
Parameter setting, ETRM, AEM and the antenna feeder system. 

4.

 

Fault analyzing and locating 
The fault is caused by: 
v.

 

Call drop due to coverage. 

¾

 

Too good wireless transmission and high power of the on-serving 
cell result in the too large coverage, which surpass the coverage of 

the adjacent cell B to reach the cell C, while the current cell does 
not define the adjacent cell C. At this time, if the MS hands over 

according to the adjacent cell B provided by the original on-serving 
cell, call drop may occur since it can not find appropriate cells. This 

phenomenon usually appears in the place where BSs are densely 
constructed. 

¾

 

A “hole” which is not covered by the wireless signal appears on the 

border of two cells. 

¾

 

The shadow of the tall buildings will cause the mobile signals to 

attenuate rapidly and handover not to be done in time, which 
results in call drop. 

¾

 

The incomplete definition of the adjacent cells causes the MS to be 
held in the current cell. If the MS is beyond the coverage border of 

the cell, call drop will occur. 

vi.

 

Call drop due to handover. 

¾

 

The lower handover limit IRXLEVULH and IRXLEVDLH are 

configured too high. When the receiving level of the mobile phone 
is lower than the lower handover limit, some handover requests 

may fail for the too weak signal intensity of the cell to be handed 
over, resulting in call drop. 

¾

 

T3103 is set too small. When BSC issues the handover command to 
BTS, if T3103 does not receive the response from BTS until time-

out, BSC judges that wireless link failure occurs in the source cell. 
At the same time, it releases the channel of the source cell, 
resulting in call drop. 

¾

 

Improper HOMAGIN definition will cause call drop. 

vii.

 

BS hardware faults. 
Generally, faulty frame unit will influence the assignment failure 
ratio and uplink/downlink quality switchover. When the receiving 

part gets faulty, the assignment failure ratio and uplink/downlink 
quality switchover will be influenced. When the transmitting part 

Содержание ZXG10 BS21

Страница 1: ...aintenance Manual Version 2 2 ZTE CORPORATION ZTE Plaza Keji Road South Hi Tech Industrial Park Nanshan District Shenzhen P R China 518057 Tel 86 755 26771900 800 9830 9830 Fax 86 755 26772236 URL http support zte com cn E mail doc zte com cn ...

Страница 2: ...ncluding without limitation any implied warranty of merchantability fitness for a particular purpose title or non infringement ZTE CORPORATION and its licensors shall not be liable for damages resulting from the use of or reliance on the information contained herein ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the subject matter...

Страница 3: ...acy Content Good Fair Average Poor Bad N A Your suggestions for improvement of this documentation Please check the suggestions which you feel can improve this documentation Improve the overview introduction Make it more concise brief Improve the Contents Add more step by step procedures tutorials Improve the organization Add more troubleshooting information Include more figures Make it less techni...

Страница 4: ...This page is intentionally blank ...

Страница 5: ...Chapter 1 1 Maintenance Security 1 Overview 2 Symbol Description 2 Toxic Substances 4 Beryllia 4 Hydrochloride 4 Electrical Safety 5 Tools 5 High Voltage 5 Power Cord 5 Drilling 5 Thunder 6 Antistatic 6 Storage Battery 7 Short Circuit 8 Hazardous Gases 8 High Temperature 8 Acid Liquid 8 Storage Battery Replacement 9 Electromagnetic Radiation 9 Working at Heights 10 Hoisting Heavy Objects 10 Using ...

Страница 6: ...Statistics 44 Analyzing Performance Report 48 Monthly Routine Maintenance 48 Creating Monthly Performance Report 48 Collecting Statistics of Bad Cells 53 Analyzing and Processing Reports 57 Generating Monthly Operation Report 58 Biannual Routine Maintenance 58 Checking BS21 AC Power 59 Checking Running Status of Heat Exchanger 60 Checking Dust Proof Status 60 Checking Running Status of CMM Module ...

Страница 7: ...ent with Hardware Accumulative Frame Number 94 Alarms of Communication Link to Main Rack 95 Alarm with Communication Link between Master Rack and Left Right Slave Rack 95 E1 Carrier Wave Receiving Alarm A D and E interfaces 96 Out of Frame Alarm at Receiving End of E1 interfaces A D and E interfaces 97 Forward Slip Code Indication at Transmitting End of E1 Interfaces A D and E interfaces 97 Backwa...

Страница 8: ...n TPU s CIP 117 Inconsistent CIP Software Versions 117 Alarm with Clock between TPU and CMM 118 TPU Power Alarm 119 TPU Frame Number Alarm 119 Receiving RF Local Oscillator PLL1 2 out of Lock 120 Transmitting RF Local Oscillator PLL1 2 out of Lock 121 52 M Reference Clock PLL Out of Lock 121 Transmitting IF Local Oscillator PLL Out of Lock 122 PA Voltage SWR Alarm 123 PA Overheat Minor Alarm 123 P...

Страница 9: ...r 7 167 Collection of Maintenance Experience 167 Reference for Wireless Parameters Adjustment during Commissioning 168 Adjusting List of Adjacent Cells and List of Carrier Sense Frequencies 168 Adjusting Wireless Parameters 170 Others 171 Analysis of Bird928 Mobile Phone s Failure to Access Network 172 Configuration Method for Intra Cell Handover 174 Appendix A 175 Replacement of Modules and Parts...

Страница 10: ...c Functions 201 Operation Description 202 Engineering Test Mode of ZTE289 Mobile Phone 211 Key Description 211 How to Enter Engineering Mode 211 How to Close Engineering Mode 211 Instructions of Engineering Mode Menu 211 BIRD Power Meter 214 BIRD Power Meter Components 214 Usage 215 HP8954E Spectrum Analyzer 217 Components 218 Usage 218 Antenna Feeder Tester SITE MASTER S332B 222 Procedure for Tes...

Страница 11: ... BS21 V2 2 Compact Outdoor BTS for GSM Installation Manual ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual Purpose of this Maintenance Manual Chapter 1 Maintenance Security presents the meanings of the signs used in this manual It also covers some safety precautions related to the installation procedure such as precautions against high voltage thunderstorms and overhead operations C...

Страница 12: ...ived from project maintenance for your reference Appendix A Replacement of Modules and Parts describes the procedure for and precautions on the replacement of modules and backplanes Appendix B Common Maintenance Tables lists forms used in routine maintenance Appendix C Use of common Instruments and Meters introduces the instructions on common instruments and meters used for maintaining the ZXG10 B...

Страница 13: ...usually the left mouse button once Double click Refers to quickly clicking the primary mouse button usually the left mouse button twice Right click Refers to clicking the secondary mouse button usually the right mouse button once Drag Refers to pressing and holding a mouse button and moving the mouse How to Get in Touch The following sections provide information on how to obtain support for the do...

Страница 14: ...ORPORATION suggestions on the documentation you can contact us by e mail at doc zte com cn or you can fax your comments and suggestions to 86 755 26772236 You can also explore our website at http support zte com cn which contains various interesting subjects like documentation knowledge base forum and service request ...

Страница 15: ...onfidential and Proprietary Information of ZTE CORPORATION 1 C h a p t e r 1 Maintenance Security In this chapter you will learn about Safety regulations to be observed Instructions on the safety symbols ...

Страница 16: ...ion In addition the safety instructions listed in this manual are only those calling for special attentions of users provided by ZTE ZTE Corporation shall not be liable for any behavior against the general safe operation requirements or against the safety standards for the design production and use of the equipment Symbol Description Safety symbols quoted in this manual are shown in Table 3 prompt...

Страница 17: ... Their respective formats and meanings are described as below Danger This sign means that personal death or major accidents such as equipment damage or breakdown may occur if you ignore this safety warning Warning This sign means that there may be a major or serious accident equipment damage or interruption of key services if you ignore this safety warning Caution This sign means that serious inju...

Страница 18: ...anical damage Do not discard components containing beryllium oxide randomly Please observe local regulations to make chemical treatment or special waste material treatment for components containing beryllium oxide If you suspect that beryllium oxide has entered your skin or been absorbed in your body please thoroughly rinse the skin wound with water and then see the doctor immediately The personne...

Страница 19: ...rom entering the equipment during operation and maintenance in damp environments Power Cord Notes Do not install or remove power cables with power on Contact of the power cable with any conductor will generate electric spark or electric arc which may cause fire or eye injury Do turn off the power supply before connecting or disconnecting a power cable Before connection make sure the connecting cab...

Страница 20: ... a device when in touch with it due to the discharge from the device To avoid any damage to sensitive devices by human body static an operator should wear an antistatic wrist strap before touching devices plug in boards circuit boards and IC chips and well ground the other end of the antistatic wrist strap The cable between the wrist and the ground must be connected in series with a more than 1M o...

Страница 21: ...ith UPS please pay due attention to the correct use and maintenance of storage batteries Danger Before battery related operations make sure you have carefully read the safety precautions on carrying the battery and learned the correct battery connection method Nonstandard operations on the battery will result in great danger During operation short circuit or electrolyte spill drain of the batterie...

Страница 22: ...cuit to the battery such as short circuits caused by improper use of operation tools If allowed please first stop battery power supply before making other operations Hazardous Gases Danger Do not use unsealed LA batteries Gases released by batteries may burn or corrode the equipment Batteries should be fixed and horizontally placed Batteries may release inflammable gases during working Keep sound ...

Страница 23: ...ifferent too Therefore it is required that the monomers of the battery group should be of the same type batch and from the same manufacturer when it is replaced In this way it is ensured that the parameters are consistent and the battery group can be used for a long time Danger Operation and maintenance personnel should not replace the specified batteries with ones of different types Otherwise exp...

Страница 24: ...e working at heights Before working at heights check all hoisting equipment Hoisting Heavy Objects Warning Do not walk about right under the boom and hoisted objected when heavy objects are hoisted When disassembling heavy equipment or moving and replacing equipment make sure there are facilities of proper hoisting capability Personnel engaged in the hoisting work must have received relevant train...

Страница 25: ...k need be carried out on the roof the ladder should be at least 1 meter higher than the eaves against which the ladder leans Fans Warning Keep your fingers or body off any dangerous parts of the fan that is still running Make sure not to stick your fingers or any tool into the running fan in case any damage or injury done to the device or the human body While replacing the related parts be sure to...

Страница 26: ...ectors and cable trough Do Nots Notes Do not perform maintenance or debugging inside the equipment unless a qualified person is present for your help Replacing any parts or altering the equipment might result in unexpected danger Therefore be sure not to replace any parts or alter the equipment unless otherwise authorized To ensure your safety if you have any question please contact ZTE Corporatio...

Страница 27: ...and Proprietary Information of ZTE CORPORATION 13 C h a p t e r 2 Maintenance Overview In this chapter you will learn about Categories of daily maintenance Common maintenance methods Precautions on daily maintenance ...

Страница 28: ... from the analysis of various alarm messages that occur during the running of the system judgment on whether there is anything abnormal to appropriate handling 4 Troubleshooting Troubleshooting is a process of analyzing handling and resolving any fault that is discovered Common Maintenance Methods Some methods need to be adopted to locate faults during daily maintenance The common maintenance meth...

Страница 29: ...n BSS including Gb interface signaling thus facilitating consulting of different signaling flows in the debugging and maintenance processes as well as detecting problems in the signaling cooperation process 4 Analyzing with instruments and meters This method allows maintenance personnel to locate analyze and remove faults with the testing mobile frequency spectrograph signaling analyzer power mete...

Страница 30: ...ly maintenance 1 Normal temperature humidity and a clean and tidy environment should be kept for the equipment room and the equipment room should be dampproof and free of dust rodents and insects 2 The primary power of the system should be stable and reliable Periodic check should be performed on the system ground and lightning protection ground Especially before thunderstorm seasons and after thu...

Страница 31: ...k cable pincers multimeter AC power for maintenance purposes telephone lines network cables antistatic wrist straps insulation tapes and common tool kits Periodical detection of the instruments and meters should be performed to ensure their accuracy 9 Frequent checks should be performed on spare parts and components to ensure their inventory and perfect conditions free from damp and mould for inst...

Страница 32: ...ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual 18 Confidential and Proprietary Information of ZTE CORPORATION This page is intentionally blank ...

Страница 33: ...ietary Information of ZTE CORPORATION 19 C h a p t e r 3 Routine Maintenance In this chapter you will learn about Daily routine maintenance Weekly routine maintenance Monthly routine maintenance Biannual routine maintenance ...

Страница 34: ...fer to section Viewing Current Notification Information Viewing the Real time attributes of a carrier Refer to section Viewing Real time Attributes of a Carrier Creating a daily performance report Refer to section Creating Daily Performance Report Checking the running state of the active equipment Creating a daily traffic report Refer to section Creating a Daily Traffic Report Viewing Current Alar...

Страница 35: ...nter the main interface of alarm management as shown in Figure 3 FI G U R E 3 AL AR M MAN AG E M E N T MAI N IN T E R F AC E Notes This interface is the logic view of alarm management On the left part of the interface is a navigation tree which shows the current configuration information A list of alarms not recovered yet is on the upper right of the interface and a notification list on the lower ...

Страница 36: ...ISP L AY O F CU R R E N T AL AR M S O N A SI T E Normal result No alarms on the site are displayed in the logic view interface of alarm management Troubleshooting Perform troubleshooting with reference to Chapter 5 Alarm Information and Troubleshooting Precautions For more information about alarm viewing please refer to ZXG10 BSS V2 0 Subsystem Operation Manual Viewing Alarms in Each Module Instru...

Страница 37: ... Management in the OMCR main interface and enter the main interface of alarm management 4 Select View Physical View in the alarm management interface as shown in Figure 5 FI G U R E 5 SE LE C T I O N INT E RF AC E F O R AL AR M MAN AG E M E N T PH Y S IC AL VI E W 5 Click Physical View to enter the interface of the physical rack as shown in Figure 6 FI G U R E 6 AL AR M MAN AG E M E N T PH Y S I C...

Страница 38: ... the round status indicator on the board indicates whether a module is faulty or normal Note Color indications are illustrated in the diagram on right side of the rack view If alarms occur in a module the alarm indicator is on in the color indicative of the highest alarm class The indictor keeps flashing when unconfirmed alarms exist in a module It does not stop until all alarms are confirmed 7 Cl...

Страница 39: ...anual Viewing Current Notification Information Instruments and meters View the current notification information of a cell through alarm management at the OMCR client end Test procedure 1 Double click to start the application program at the OMCR client end 2 Enter the username and password according to the screen prompt and then enter the OMCR main interface 3 Select Fault Manage Alarm Management i...

Страница 40: ...story Query to enter the alarm query wizard as shown in Figure 10 FI G U R E 10 AL AR M QU E R Y WI Z AR D DI AL O G BO X 6 Select Information in Alarm Type and specify the Start Time and End Time in Interval the start time and the end time should be on the same day Please see Figure 11 FI G U R E 11 AL AR M QU E R Y WI Z AR D IN T E R F AC E ...

Страница 41: ...Next to enter the Alarm Query Wizard dialog box as shown in Figure 12 FI G U R E 12 AL AR M QU E R Y WI Z AR D 1 8 Select the NM domain where the base station is located and select the base station controller in Select information source as shown in Figure 13 FI G U R E 13 AL AR M QU E R Y WI Z AR D 2 ...

Страница 42: ...Wizard dialog box 3 as shown in Figure 14 FI G U R E 14 AL AR M QU E R Y WI Z AR D 3 10 Click such cell notification information content as No call in this cell in Select information code and click to specify the selected information as shown in Figure 15 FI G U R E 15 AL AR M QU E R Y WI Z AR D 4 11 Click Finish to display the notification information in the cell ...

Страница 43: ...anual Viewing Real time Attributes of a Carrier Instruments and meters View the real time attributes of a carrier in the dynamic data management interface at the OMCR client end Test procedure 1 Double click to start the application program at the OMCR client end 2 Enter the user name and password based on the screen prompt to enter the OMCR main interface 3 Select Configuration Management Æ Dynam...

Страница 44: ...erface Handling Check whether the dynamic data of a carrier is abnormal If not perform troubleshooting with reference to the handling methods of carrier faults in Chapter 7 Precautions For more information about dynamic data status display refer to ZXG10 BSS V2 0 BS Subsystem Operation Manual Creating Daily Performance Report Instruments and meters Create a daily performance report in the performa...

Страница 45: ...OMCR main interface to enter the Performance Analyzer interface as shown in Figure 18 FI G U R E 18 PER F O RM AN C E AN AL Y Z E R MAI N IN T E R F AC E 4 Click the menu Report Æ Create Performance Report or the corresponding button to enter the Performance Report Wizard dialog box as shown in Figure 19 FI G U R E 19 PER F O RM AN C E RE P O R T WIZ AR D ...

Страница 46: ...n menu and then in Please select domain and type of report specify System performance report in Selected Type field Click to add the selected type to All Types as shown in Figure 20 FI G U R E 20 SEL E C T NM DOMAI N AN D RE P O R T TY P E 6 Click Next to enter the Performance Report Wizard 1 as shown in Figure 21 FI G U R E 21 PER F O RM AN C E RE P O R T WIZ AR D 1 ...

Страница 47: ...t the level of analyzed objects Then specify the object to be analyzed in All Objects and click to add the object to Selected Objects as shown in Figure 22 FI G U R E 22 PLE AS E SE L E C T AN AL Y Z E D OB J E C T S 8 Click Next to enter the Performance Report Wizard 2 as shown in Figure 23 FI G U R E 23 PER F O RM AN C E RE P O R T WIZ AR D 2 ...

Страница 48: ...SE L E C T TI M E 10 Select the time when the report is generated and click Ok 11 Select the start time and stop time in Busy time which can only be set to have one hour interval then click Finish and you can get the performance report of a certain period of a certain day as shown in Figure 25 FI G U R E 25 DAI L Y PE R FO RM AN C E RE P O R T DI S P L AY RE S U L T Normal result Refer to Appendix...

Страница 49: ...ystem Operation Manual Creating a Daily Traffic Report Instruments and meters Create a daily traffic report in the performance management interface at the OMCR client end Test procedure 1 Double click to start the OMCR client end application program 2 Enter the user name and password according to the screen prompt to enter the OMCR main interface 3 In the OMCR main interface select Performance Man...

Страница 50: ...wn menu of Please select domain and type of report Then specify Daily traffic report in the Selected Type field Click to add the selected type to All Types as shown in Figure 27 FI G U R E 27 SEL E C T NM DOMAI N AN D RE P O R T TY P E 6 Click Next to enter the Performance Report Wizard 1 as shown in Figure 28 FI G U R E 28 PER F O RM AN C E RE P O R T WIZ AR D 1 ...

Страница 51: ...t the level of analyzed objects Then specify the object to be analyzed in All Objects and click to add the object to Selected Objects as shown in Figure 29 FI G U R E 29 PLE AS E SE L E C T AN AL Y Z E D OB J E C T S 8 Click Next to enter the Performance Report Wizard 2 as shown in Figure 30 FI G U R E 30 PER F O RM AN C E RE P O R T WIZ AR D 2 ...

Страница 52: ...U R E 31 DAI L Y TR AF F I C RE P O R T DI S P L AY RE S U L T Normal result Refer to Appendix D for telecom network operation maintenance quality indexes made by individual carriers wireless part Troubleshooting Perform troubleshooting with reference to traffic related contents in Chapter 6 Precautions For more information about the traffic report refer to ZXG10 BSS V2 0 BS Subsystem Operation Ma...

Страница 53: ...s Checking the running state of the active equipment Analyzing a performance report Refer to section Analyzing Performance Report Viewing History Alarms Instruments and meters View the history alarms in the alarm management interface at the OMCR client end Test procedure 1 Double click to start the OMCR client end application program 2 Enter the user name and password according to the screen promp...

Страница 54: ...E CT I N G AL AR M HI S T O R Y QU ER Y IN T E R F AC E 5 Click Alarm History Query to enter the alarm query wizard as shown in Figure 33 FI G U R E 33 AL AR M QU E R Y WI Z AR D DI AL O G BO X 6 Select Alarm History in Alarm Type and select the Start Time and Stop Time both at the same day in Interval Then click Next to enter Alarm Query Wizard 1 as shown in Figure 34 ...

Страница 55: ...ZTE CORPORATION 41 FI G U R E 34 AL AR M QU E R Y WI Z AR D 1 7 Select a value in Domain field and specify a site in Select alarm source as shown in Figure 35 FI G U R E 35 AL AR M QU E R Y WI Z AR D 2 8 Click Next and you will enter Alarm Query Wizard 3 as shown in Figure 36 ...

Страница 56: ...wo query modes can be set in this interface query by alarm code or by alarm class i To query history alarms by alarm code you should click Alarm Code in Select and specify the alarm codes to be queried in Select Alarm Code Then click to add the selected alarms allowing multiple choices codes to the display area as shown in Figure 37 FI G U R E 37 QUE R Y B Y AL AR M COD E ...

Страница 57: ...o be queried in Select Alarm Class allowing multiple choices as shown in Figure 38 FI G U R E 38 QUE R Y B Y AL AR M CL AS S 10 Finally click Finish to display history alarms as shown in Figure 39 FI G U R E 39 CON F I RM E D HI STO R Y AL AR M DI S P L AY Handling Observe the alarms that occur repeatedly Make analysis of these alarms specifically and perform troubleshooting ...

Страница 58: ...nt end application program 2 Enter the user name and password according to the screen prompt to enter the OMCR main interface 3 Select Fault Manage Alarm Management in the OMCR main interface and enter the main interface of alarm management 4 Select the menu File Æ Alarm Statistics Æ Alarm Frequency Statistics in the alarm management interface as shown in Figure 40 FI G U R E 40 AL AR M FR E Q U E...

Страница 59: ...tatistic objects in the left logic tree and click to add them to the right display area See Figure 42 FI G U R E 42 AL AR M FR E Q U E N C Y ST AT I S T I C S SE L EC T I NG AL AR M SO UR C E Alarm sources highlighted in dark color are the selected alarm sources those highlighted in light color are alarm sources whose subtrees are not completely selected and those not highlighted are not selected ...

Страница 60: ... highest frequencies See Figure 43 FI G U R E 43 AL AR M FR E Q U E N C Y ST AT I S T I C S SE L E C TI NG TIM E PE RI OD F O R AL AR M ST AT I S T I C S 8 Click Other tab to set filtering conditions for alarm statistics At least one check box must be checked in each group box Refer to Figure 44 FI G U R E 44 AL AR M FR E Q U E N C Y ST AT I S T I C S SE L EC T I NG ST AT I S T I C S FI L T E R I ...

Страница 61: ...mode of the statistics result as shown in Figure 46 FI G U R E 46 AL AR M FR E Q U E N C Y ST AT I S T I C S SH O WI N G ST AT I S T I C S RE S U L T I N A GR AP H Graph display mode is customized Drag scroll bar at bottom of the graph to view more alarm statistics To view statistics in a list click List Alternatively click Report to start report wizard Handling The statistics are based on the ala...

Страница 62: ...stics of Bad Cells Analyzing and processing the reports Refer to section Analyzing and Processing Reports Checking the running state of the active equipment Generating a monthly operation report Refer to section Generating Monthly Operation Report Creating Monthly Performance Report Instruments and meters Create a monthly performance report in the performance management interface at the OMCR clien...

Страница 63: ...First select a domain in the pull down menu of Please select domain and type of report Then specify System performance report in Selected Type field Click to add the selected type to All Types as shown in Figure 48 FI G U R E 48 SEL E C T NM DOMAI N AN D RE P O R T TY P E 6 Click Next to enter the Performance Report Wizard 1 as shown in Figure 49 ...

Страница 64: ...T WIZ AR D 1 7 Select the object level in the pull down menu of Please select the level of analyzed objects Then specify the object to be analyzed in All Objects and click to add the object to Selected Objects as shown in Figure 50 FI G U R E 50 PLE AS E SE L E C T AN AL Y Z E D OB J E C T S 8 Click Next to enter the Performance Report Wizard 2 as shown in Figure 51 ...

Страница 65: ...type and time of report and click Select Month to enter the Please select the time dialog box as shown in Figure 52 FI G U R E 52 PLE AS E SE L E C T TI M E MO N T H 10 Select the required month and click OK then in Select the busy time select the start time and stop time The busy hour time interval can only be set as one hour Then click Next to enter the interface as shown in Figure 53 ...

Страница 66: ...fied click Finish to display the content of the monthly report as shown in Figure 54 FI G U R E 54 MO N T H L Y RE P OR T DI S P L AY RE S U L T Normal result Refer to Appendix D for telecom network operation maintenance quality indexes made by individual carriers wireless part Troubleshooting Make analysis of the performance indexes of the cell based on the performance report and implement releva...

Страница 67: ... to start the OMCR client end application program 2 Enter the user name and password according to the screen prompt to enter the OMCR main interface 3 In the OMCR main interface select Performance Management Performance Analyzer then you will enter its main interface 4 Click the menu Report Æ Create Performance Report or the corresponding button to enter the Performance Report Wizard dialog box as...

Страница 68: ...tary Information of ZTE CORPORATION FI G U R E 56 BAD CE L L RE P OR T 6 Click Next and enter bad cell performance report wizard 1 as shown below FI G U R E 57 PER F O RM AN C E RE P O R T WIZ AR D 1 7 In All Objects select the object to be analyzed and click The interface is shown as below ...

Страница 69: ...Y Z E D OB J E C T S 8 Click Next to enter the Performance Report Wizard 2 for the bad report as shown in Figure 59 FI G U R E 59 PER F O RM AN C E RE P O R T WIZ AR D 2 9 Click Monthly Report in Please select type and time of report and click Select Month to enter the Please select the time dialog box as shown in Figure 60 ...

Страница 70: ...required month and click OK then in Select the busy time select the start date and stop date The busy hour time interval can only be set as one hour Then click Next to enter the interface as shown below FI G U R E 61 SEL E C T ST AR T TI M E AN D ST O P DAT E 11 When the start and stop date have been specified click Finish to display the content of the monthly report as shown in Figure 62 ...

Страница 71: ...mance in the bad cell based on the statistics and handle the problem appropriately Precautions For more information about the bad cell data report refer to ZXG10 BSS V2 0 BS Subsystem Operation Manual Analyzing and Processing Reports Instruments and meters Create various types of reports in the performance management interface at the OMCR client end Test procedure Analyze the monthly reports Norma...

Страница 72: ... E CH E C K L I S T Category Check items Remarks Checking the BTS AC power Refer to section Checking BS21 AC Power Checking the running status of the heat exchanger Refer to section Checking Running Status of Heat Exchanger Checking the environment monitoring equipment Checking the dust proof status Refer to section Checking Dust Proof Status Checking the running status of the CMM module Refer to ...

Страница 73: ...ection Checking whether Grounding Cable is Reliable Checking and maintaining the auxiliary equipment Measuring the grounding resistance Refer to section Grounding Resistance Test Checking the running status of the transmission equipment Refer to section Checking Running Status of Transmission Equipment Checking and maintaining the auxiliary equipment Checking the running status of UPS Refer to sec...

Страница 74: ... no leakage water or rust inside the heat exchanger Troubleshooting Implement maintenance to the heat exchanger Recovery after test None Checking Dust Proof Status Instruments and meters Vacuum cleaner duster cloth and alcohol Test procedure Check the equipment shell and the interior to see if there are cobwebs or obvious dust Normal result The equipment room should be tidy and clean with no obvio...

Страница 75: ... Hz Application running SYN System synchronization indicator Green red The green indicator is on Abis interface network synchronization clock The green indicator flashes SDH network synchronization clock The indicator is off free run CLK Clock indicator Green red The green indicator is on the network synchronization is locked The green indicator flashes 1 Hz in lock phase The indicator is off free...

Страница 76: ... is broken or whether there are over voltage or under voltage alarms For troubleshooting of LAPD link broken alarms refer to LAPD Long Time Link Disconnection For troubleshooting of over voltage or under voltage alarms refer to Power Over Under Voltage Alarms 2 RUN troubleshooting When the RUN red indicator is on or flashes check at the background or LMT whether there is an LAPD link broken alarm ...

Страница 77: ... the standby rack to the active rack refer to Alarms of Communication Link to Main Rack For troubleshooting of communication link failure between the active rack and the left and right standby racks refer to Alarm with Communication Link between Master Rack and Left Right Slave Rack iii When the STA red indicator is on check at the background or LMT whether there are alarms about indications of E1...

Страница 78: ...ndicator is on BCCH indication refer to the note below The green indicator flashes 1 Hz BCCH indication and System Info is broadcast The green indicator is off non BCCH indication ACT Channel activation indicator Green The green indicator flashes channel activation indication SDCCH TCH The green indicator is off no traffic in the channels which are deactivated STA Status indicator Green red The in...

Страница 79: ...ombined channels such as combinations of TCH F SDCCH 8 and SDCCH 4 as long as one logical sub channel is activated for example the SDCCH sub channel the whole TS is seen activated When some timeslots are allocated as the common control channel and dedicated control channel such as main BCCH channel combination and extBCCH channel combination they are defined as non activated and will not be kept i...

Страница 80: ...t the background or LMT whether there are alarms of LAPD link disconnection in FUC and BSC communication breakdown between CMM and FUC and TPU power failure For troubleshooting of LAPD link disconnection in FUC and BSC refer to Disconnected LAPD Link between FUC and BSC For troubleshooting of communication breakdown between CMM and FUC refer to Interrupted Communication between CMM and FUC For tro...

Страница 81: ...are broken For information of troubleshooting of LAPD link broken alarms refer to Disconnected LAPD Link between FUC and BSC ii If the STA red indicator flashes at a frequency of 4 Hz it shows that HDLC links in the ETRM module are broken To troubleshoot it check at the background or LMT whether there is a CMM and FUC communication breakdown alarm For troubleshooting of the alarm refer to Interrup...

Страница 82: ... 14 lists abnormal status of indicators on CDU module panel TAB L E 14 AB N O R M AL ST AT U S O F IN DI C AT O R S O N CDU MO D U L E PAN E L Name Description Color Abnormal Status Exception handling FPO Indicator of normal output of the forward power Green The green indicator is off in abnormal conditions SWR1 SWR alarm level 1 Red The red indicator is on when there is such an alarm Refer to AEM...

Страница 83: ... set band GSM900 925 MHz 960 MHz GSM1800 1805 MHz 1880 MHz In the case of full power read the output power and the gain flatness Normal result It is required the output power should be larger than 40 W with the gain flatness of less than 0 5 dB Troubleshooting 1 For a 60 W BS21 V2 2 if the amplifier output power does not meet the technical specifications check whether the ETRM output level is with...

Страница 84: ...ect the load with TEST PORT and select ENTER then the system will perform automatic correcting 8 Loosen the jumper connector connected with the cabinet 9 Connect the SiteMaster with the port of the jumper through a testing cable 10 Read the value and judge if it meets the requirement of the index Normal result The normal result should be SWR 1 5 Troubleshooting If the test result is not normal use...

Страница 85: ...rection interface of CKU as shown in Figure 63 FI G U R E 63 CKU CO R R E C T IO N 5 Press Start to originate communication with the foreground Start is valid when the program is started Other buttons are invalid Start becomes invalid when pressing Start to originate communication with the foreground and other buttons like Calibrate become valid 6 The current CKU values are displayed in the CKU Ca...

Страница 86: ...he calibration procedure Normal result The clock can be calibrated to 13 000000 MHz 0 025 ppm Troubleshooting Replace CMM module if it is impossible to calibrate clock to above range Recovery after test Reset the base station to its original mode if it works at the external synchronization mode previously Checking Fastness of Antennae and Towers Instruments and meters A spanner Test procedure 1 Ch...

Страница 87: ...0 40 5 0 6 0 7 0 80 90 80 7 0 6 0 5 0 5 0 6 0 7 0 80 90 80 7 0 6 0 5 0 40 30 20 10 4 3 2 1 0 5 7 6 8 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 2 15 12 1 15 2 12 1 DIAL 1 Press goniometer against object measured as shown in Figure 65 FI G U R E 65 MEAS U R I N G OB L I Q U I T Y 1 2 3 0 1 2 3 80 80 7 8 6 0 4 6 5 70 50 8 60 50 70 5 6 7 2 3 4 12 15 60 80 90 4 70 8 7 5 6 1 40 50 30 10 2 0 20 1...

Страница 88: ... firmly and move them together until the bubble in the air bleeder in the middle of two indication rings See Figure 66 FI G U R E 66 AD J U S T I N G LO WE R TI L T I N G AN G L E 3 6 0 7 5 0 8 6 5 4 12 5 0 1 2 7 8 3 5 6 4 50 70 60 80 3 4 0 1 2 1 6 0 7 0 8 0 90 8 6 5 7 D IA L 0 30 70 10 30 40 20 2 0 1 0 7 2 2 80 90 0 1 1 70 80 60 4 3 6 5 12 15 40 50 8 1 2 2 15 Recovery after test None Checking whe...

Страница 89: ... adhesive tape at the connector followed by the sealing adhesive tape and finally the insulation tape 4 Wrap the adhesive tape layer by layer from the bottom up to avoid rainwater leakage 5 Re power on all the ETRM modules Recovery after test None Checking E1 Interfaces Instruments and meters None Test procedure 1 Check whether the E1 cable is aging distorted extruded deformed or too tight 2 Check...

Страница 90: ...e AEM module panel to see if there are SWR1 and SWR2 alarms 2 Check whether the RF cable of the antenna feeder is aging Normal result 1 The indicators on the AEM module panel show no sign of SWR alarms 2 The RF cable of the antenna feeder is not aging Troubleshooting 1 With reference to the SWR measuring method in Measuring SWR of Antenna Feeder check the SWR of the jumper the main feeder and the ...

Страница 91: ...tning protection arrester with a matched load 6 Read the SiteMaster and judge whether the return loss of the lightning protection arrester is within the valid range 7 Repeat steps 4 6 to measure the return loss of another port on the lightning protection arrester 8 Adjust the multimeter to X10K and then measure the resistance of the conductor in the high frequency sockets at both ends of the light...

Страница 92: ...t procedure Check whether connectors of the grounding cables are loose rusty or ageing Normal result The connectors are not loose rusty or aging Troubleshooting Replace the grounding cable and reconnect the new one Recovery after test None Grounding Resistance Test Instruments and meters A ground resistance tester type ZC 8 Test procedure 1 Disconnect the grounding downlead from the equipment and ...

Страница 93: ...ents Troubleshooting Check whether grounding downlead is connected with ground grid fixedly Check whether the ground grid system complies with the design and whether resistivity reduction mixture is added regularly Recovery after test None Checking Running Status of Transmission Equipment Instruments and meters Test procedure Observe whether indicators on the transmission equipment show the presen...

Страница 94: ...TS for GSM Maintenance Manual 80 Confidential and Proprietary Information of ZTE CORPORATION Normal result There is no battery leakage and the connection is normal Troubleshooting Refer to the UPS Instructions Recovery after test None ...

Страница 95: ...ntial and Proprietary Information of ZTE CORPORATION 81 C h a p t e r 4 Notification and Handling In this chapter you will learn about Summary of notification information No traffic notification in the BS cell ...

Страница 96: ...nagement at the background iv If there is no current alarm and the statuses of channel FU CU and cell are normal do as follows Trace signaling of the cell at the background to observe whether there is any message and the details of the message Block unblock the cell FU CU and channel to observe whether there is any traffic If there is no traffic reset ETRM to observe whether there is any traffic I...

Страница 97: ...RPORATION 83 clock is offset Use LMT to calibrate the clock for details please refer to Calibrating Clock Power off ETRM modules and restart them to observe whether there is any traffic Power off CMM modules and restart them to observe whether there is any traffic Changeover ETRM modules ...

Страница 98: ...ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual 84 Confidential and Proprietary Information of ZTE CORPORATION This page is intentionally blank ...

Страница 99: ...Confidential and Proprietary Information of ZTE CORPORATION 85 C h a p t e r 5 Alarms and Handling In this chapter you will learn about Summary of the alarms CMM alarms ETRM alarm ...

Страница 100: ... alarm level definitions the affected range only refers to the effect on a single index That is to say when the effect on an index such as reliability and safety reaches a certain scope the alarm level can be basically determined If an alarm affects several indexes it should consider upgrading the alarm level Alarm handling varies with the alarm levels 1 When level 1 or level 2 alarms appear conta...

Страница 101: ...rms for the communication link to the main rack 4 0X1A15 Refer to Alarms of Communication Link to Main Rack Alarm with the Communication Link between the Master Rack and Left Right Slave Rack 4 0X1A16 0X1A17 Refer to Alarm with Communication Link between Master Rack and Left Right Slave Rack E1 carrier wave receiving alarm A D and E interfaces 3 0X1A32 0X1A4A 0X1A52 Refer to E1 Carrier Wave Receiv...

Страница 102: ...nment alarm Backbone Node Alarm Customized 0XF15 0XF20 Refer to Dry Contact Alarm LNA low noise amplifier alarm 3 0X1AC8 Refer to LNA Low Noise Amplifier Alarm Power alarm for the tower mounted amplifier 4 0X1AC9 Refer to Power Alarm for Tower Mounted Amplifier AEM SWR minor alarm 3 0X1ACA Refer to AEM SWR Minor Alarm AEM SWR major alarm 2 0X1ACB Refer to AEM SWR Major Alarm AEM power alarm 2 0X1A...

Страница 103: ... 3 0X1C04 Refer to 52 M Reference Clock PLL Out of Lock Transmitting IF local oscillator PLL out of lock 3 0X1C05 Refer to Transmitting IF Local Oscillator PLL Out of Lock PA voltage standing wave ratio alarm 3 0X1C08 Refer to PA Voltage SWR Alarm PA overheat minor alarm 4 0X1C09 Refer to PA Overheat Minor Alarm PA overheat major alarm 3 0X1C0A Refer to PA Overheat Major Alarm PA output power alar...

Страница 104: ...rsions 3 0X1B24 Refer to Inconsistent CHP Software Versions Temporary no response from FUC s L3 software 4 0X1B25 Refer to Temporary No Response from FUC s L3 Software CIP parameter configuration error 3 0X1B29 Refer to Inconsistent Cell Parameter Configuration WATCHDOG overflow in TPU s CIP 3 0X1B2A Refer to WATCHDOG Overflow in TPU s CIP Inconsistent CIP software version 3 0X1B2B Refer to Incons...

Страница 105: ... it is the CMM board fault or the transmission line problem Use LMT to check whether the CMM version is correct Disconnect the inlet and the outlet of E1 line at the BTS side to see whether the red SYN indicator on the CMM panel is always on If not it means that the CMM board has problem Replace the CMM board Self loop the E1 line at the BTS side and check status of the red SYN indicator on the CM...

Страница 106: ...ed too many times and read write error occurs 4 Handling method Typically it is the fault with the FLASH chip and the user cannot solve such problems Replace the CMM module in time in the case of such faults 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions If the CMM board is not replaced in time the device may not be restarted after reset HW Long Time Link Disco...

Страница 107: ...information Alarm code 0X1A03 Alarm level 3 Alarm influence CMM works abnormally Alarm unit location type SITE The power indicator displays the alarm Internal handling flow None 3 Cause The voltage of the CMM power supply is out of the adjustable range 4 Handling method Replace the CMM as soon as possible 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None Cloc...

Страница 108: ...lative Frame Number Inconsistent with Hardware Accumulative Frame Number 1 Description The software accumulated frame number differs from the hardware accumulated frame number 2 Related information Alarm code 0X1A05 Alarm level 3 Alarm influence the TPU frame numbers are confusing and no ETRMs managed by this CMM can work normally Alarm unit location type SITE 3 Cause Interference level in the cir...

Страница 109: ...Check whether the cables between the racks are connected securely and whether the cables have been damaged Correct the faulty conditions ii Start communication self test of the master slave racks to determine whether it is the problem with the CMM hardware or software flow Solve the possible problems 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions This alarm sho...

Страница 110: ...ng alarm A D and E interfaces 2 Related information Alarm code 0X1A32 0X1A4A 0X1A52 Alarm level Alarm influence If tbe alarm does not occur frequently it is little influence on the call If it occurs frequently once every few minutes it can cause abnormal conversation or abnormal link establishment between ETRM and BSC Alarm unit location type SITE 3 Cause The chip is faulty the clock is abnormal t...

Страница 111: ... establishment between ETRM and BSC Alarm unit location type SITE 3 Cause The chip is faulty the clock is abnormal there is phase difference from that of the BSC clock or the E1 line is not connected securely 4 Handling method i Check the electrical connection performance of the E1 cable ii If the E1 cable is in good condition plug the module securely and reset it iii If the alarm persists the E1 ...

Страница 112: ...i If the E1 cable is in good condition plug the module securely and reset it iii If the alarm persists the E1 interface chip may be abnormal iv If the chip self test is passed start the E1 interface self loop test flow v If the E1 interface self loop test is normal it can be basically considered that the transmission equipment is faulty 5 Verification This alarm does not appear in the OMCR alarm i...

Страница 113: ...the E1 interface self loop test is normal it can be basically considered that the transmission equipment is faulty 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions If the alarm does not appear frequently it can be ignored Forward Slip Code Indication at Receiving End of E1 Interfaces A D and E Interfaces 1 Description Positive slip code indication appears at the ...

Страница 114: ...f the E1 interface self loop test is normal it can be basically considered that the transmission equipment is faulty 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions If the alarm does not appear frequently it can be ignored Backward Slip Code Indication at Receiving End of E1 Interfaces A D and E Interfaces 1 Description Negative slip code indication appears at t...

Страница 115: ...nterface self loop test flow v If the E1 interface self loop test is normal it can be basically considered that the transmission equipment is faulty 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions If the alarm does not appear frequently it can be ignored ETRM Alarm Dry Contact Alarm 1 Description The dry contact alarm happens 2 Related information Alarm code 0XF...

Страница 116: ...versity LNAs are faulty or cannot work normally if only one LNA is faulty Alarm unit location type SITE 3 Cause The LNA is overcurrent by 30 4 Handling method Replace the AEM module 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None Power Alarm for Tower Mounted Amplifier 1 Description Tower amplifier power alarm happens 2 Related information Alarm code 0X1AC9...

Страница 117: ...ing wave ratio is larger than 1 4 and less than 3 0 4 Handling method Continue the observation It is unnecessary to replace the AEM module if the normal service is not affected 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None AEM SWR Major Alarm 1 Description AEM SWR major alarm 2 Related information Alarm code 0X1ACB Alarm level 2 Alarm influence Transmissi...

Страница 118: ...on Alarm code 0X1ACC Alarm level 2 Alarm influence Transmission will be affected Alarm unit location type SITE Internal handling flow Relevant ETRM is disabled 3 Cause The AEM power supply has an alarm 4 Handling method Replace the AEM in time 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None AEM Type Alarm 1 Description AEM type alarm happens 2 Related infor...

Страница 119: ...rm interface 6 Precautions None AEM Not in Position Alarm 1 Description AEM not in position alarm happens 2 Related information Alarm code 0X1ACF Alarm level 2 Alarm influence Transmission will be affected Alarm unit location type SITE Internal handling flow The power amplifier is shut down and relevant ETRM is disabled 3 Cause AEM not in position alarm happens 4 Handling method Replace the AEM mo...

Страница 120: ...e 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions If the alarm affects the BCCH carrier handle it immediately If it affects the TCH carrier only handle it as soon as possible Otherwise the traffic capacity of the cell will be affected TPU s CHP DSP1 3 Initialization Failure 1 Description TPU s CHP DSP1 3 initialization fails 2 Related information Alarm code 0X1B...

Страница 121: ... 2 Related information Alarm code 0X1B08 Alarm level 3 Alarm influence The ETRM is unavailable If it is a BCCH carrier the operation of the whole cell will be affected Alarm unit location type FU Internal handling flow This ETRM is disabled If it is a BCCH carrier implement the BCCH backup flow 3 Cause AD6620 initialization fails 4 Handling method i Reset the module to have it work normally ii If ...

Страница 122: ...mmediately 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions This alarm should be handled immediately CIP Resource Unavailable 1 Description CIP resource is unavailable 2 Related information Alarm code 0X1B0A Alarm level 3 Alarm influence This ETRM is unavailable If it is a BCCH carrier the operation of the whole cell will be affected Alarm unit location type FU 3...

Страница 123: ...rnal interference that leads to errors when the CPU reads data from the FLASH MEMORY The carrier unit can work normally after the fault is recovered ii If the resetting cannot recover the alarm replace the ETRM module 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None WATCHDOG Overflow in TPU s CHP DSP0 1 Description The WATCHDOG overflows in TPU s CHP DSP0 2 ...

Страница 124: ...e handled immediately WATCHDOG Overflow in TPU s CHP DSP1 3 1 Description The WATCHDOG overflows in TPU s CHP DSP1 3 2 Related information Alarm code 0X1B11 0X1B12 0X1B13 Alarm level 4 Alarm influence The DSP1 3 of the channel processing unit do not respond temporarily The control unit reloads the DSP program and re initializes it If the alarm cannot be recovered the DSP loading does not succeed T...

Страница 125: ... the ETRM to solve the problems ii If the resetting does not work replace the ETRM module 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions None Parameter Configuration Error in TPU s Channel 0 7 1 Description The parameter configuration in TPU s channel 0 7 is wrong 2 Related information Alarm code 0X1B1A 0X1B21 Alarm level 4 Alarm influence In general the BSC ba...

Страница 126: ... BSC background validates the data before the synchronization This alarm seldom happens because the data will not be synchronized unless the validity check passes It will make the BTS unable to work normally Alarm unit location type FU Internal handling flow CMM tries to re configure parameters 3 Cause The cell parameter configuration is wrong or conflicts with the configuration of channel paramet...

Страница 127: ...handled immediately Inconsistent CHP Software Versions 1 Description The CHP software version is inconsistent 2 Related information Alarm code 0X1B24 Alarm level 3 Alarm influence The four DSPs of the CHP cannot work If one is configured as BCCH the whole cell will be unable to work normally Alarm unit location type FU Internal handling flow Download the latest CHP software version again 3 Cause T...

Страница 128: ... reset it when the traffic is not heavy iii If the alarm occurs after the resetting reset the CMM when the traffic is not heavy iv If the alarm persists replace the ETRM module 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions This alarm can be ignored Disconnected LAPD Link between FUC and BSC 1 Description The LAPD Link between FUC and BSC is disconnected 2 Rela...

Страница 129: ...cted or the CMM hardware is in error 4 Handling method The system can go on but no data configuration can be implemented If the long term link disconnection occurs only to the ETRM follow the following steps for troubleshooting i Check whether the ETRM has been plugged or is plugged securely ii Reset the ETRM and check whether the alarm is recovered iii Check whether the CMM board works normally i...

Страница 130: ...the DSP initialization failure is generally caused by strong external interference and the ETRM unit can still work normally If the alarm cannot be recovered replace the corresponding ETRM module 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions This alarm should be handled immediately CIP Parameter Configuration Error 1 Description CIP parameter configuration is ...

Страница 131: ... The control unit reloads the DSP program and re initializes it If the alarm cannot be recovered the DSP loading does not succeed This fault may cause one carrier unit cannot work normally Alarm unit location type FU Internal handling flow FU keeps trying to download 3 Cause The DSP program of the modulation module does not respond temporarily 4 Handling method i Reset the carrier unit and check w...

Страница 132: ...n the OMCR alarm interface 6 Precautions This alarm should be handled immediately Alarm with Clock between TPU and CMM 1 Description Alarm happens with the clock between TPU and CMM 2 Related information Alarm code 0X1B2C Alarm level 2 Alarm influence The FUC cannot work The cell service will be affected if the FUC is a BCCH TPU Alarm unit location type FU 3 Cause The clock between TPU and CMM is ...

Страница 133: ...None TPU Frame Number Alarm 1 Description TPU frame number alarm happens 2 Related information Alarm code 0X1B2E Alarm level 3 Alarm influence This ETRM cannot work If the ETRM carries BCCH the cell service will be affected Alarm unit location type FU Alarm influence Alarm will be reported If the alarm cannot be recovered for a long time it marks this ETRM resource unavailable 3 Cause The frame cl...

Страница 134: ...r PLL1 2 out of Lock 1 Description Receiving RF local oscillator PLL1 2 are out of lock 2 Related information Alarm code 0X1C00 0X1C01 Alarm level 3 Alarm influence This ETRM cannot serve calls Alarm unit location type CU Internal handling flow This ETRM is disabled 3 Cause The clock signal is unstable or the ETRM phase locked loop is faulty 4 Handling method i Use the LMT to check whether there i...

Страница 135: ...eplace the module concerned if no check the front panel TP interface 13 M clock to see if there is any output If there is no output the clock from TPU to RCU is faulty Replace the ETRM module ii If the above fault disappears the local oscillator may be faulty Replace the ETRM in time 5 Verification This alarm does not appear in the OMCR alarm interface 6 Precautions This alarm should be handled im...

Страница 136: ...1 Description The transmitting IF local oscillator PLL is out of lock 2 Related information Alarm code 0X1C05 Alarm level 3 Alarm influence This ETRM cannot serve calls Alarm unit location type CU Internal handling flow This ETRM is disabled 3 Cause The clock signal is unstable or the ETRM phase locked loop is faulty 4 Handling method i Check whether there is any clock alarm through LMT If yes rep...

Страница 137: ...not appear in the OMCR alarm interface 6 Precautions None PA Overheat Minor Alarm 1 Description PA overheat minor alarm happens 2 Related information Alarm code 0X1C09 Alarm level 4 Alarm influence ETRM can still work but the PA ages at a quicker step Alarm unit location type CU 3 Cause The PA is overheated Possibly the PA has worked at full power for a long time the fan is not running for a long ...

Страница 138: ...for a long time the fan is not running for a long time the ambient temperature is too high or the detection circuit is faulty 4 Handling method i Check whether the fan works normally and whether the ambient temperature is too high ii If the fan works normally and the ambient temperature is normal but the PA temperature alarm persists the detection circuit may be faulty Replace the ETRM in time 5 V...

Страница 139: ...y Over voltage Alarm 1 Description The PAS power amplifier power supply is over voltage 2 Related information Alarm code 0X1C0C Alarm level 3 The PA may be damaged or the modulation module shuts off the output power protectively Alarm unit location type CU 3 Cause The PAS power amplifier power supply is over voltage 4 Handling method Check whether the PAS detection circuit is faulty If so replace ...

Страница 140: ...LRC_AL downward link has check error 2 Related information Alarm code 0X1C0E Alarm level 3 Alarm influence Massive error codes appear between CHP and the modulation module the downward link is faulty or the ETRM cannot serve calls normally Alarm unit location type CU Internal handling flow ETRM is disabled 3 Cause There is interference in the link between the CHP and modulation module 4 Handling m...

Страница 141: ...eshooting In this chapter you will learn about Summary of common problems List of major faults Troubleshooting procedure of components failures Troubleshooting at the BS commissioning stage Troubleshooting in the BS maintenance stage Troubleshooting in the BS cutover and expansion stages ...

Страница 142: ...en Link of BS Carrier BS works normally but can not hand over normally It can not hand over with the adjacent cells Refer to BS in Normal Status but BS Handover Is Abnormal Handling the lightning stricken BS failures Refer to Handling Lightning Stricken BS Faults The signal of MS is not stable in idle state Refer to MS Signal is not Stable in Idle State The signal of MS is not stable in busy state...

Страница 143: ...larms through OCMR or LMT If LMT is normal but OMCR not report the problem to ZTE If conditions permitting trace the signaling and attach the trace file 3 Reboot the faulty components to see whether the faults still exist If not they are good If faults occur on PA reboot the related TRU 4 Unplug the faulty components and insert them again if faults occur on PA insert TRU and PA again Boot up to se...

Страница 144: ...may be caused by the following factors LAC and cell code at the MSS side are not configured consistently with those at the BSS side Wireless parameters are not configured properly The hardware faults of BS such as antenna feeder system fault network synchronization not being in locked status and frequency deviation occur on the clock or ETRM fault Transmission faults Faults but no alarms occur to ...

Страница 145: ...etherwirelessparameters needadjustment WhethertheCLKindicatorof theCMMmoduleisnormal Whetherthe13Mclockisnormal Whethertransmissionisnormal ReplacetheTRMmodule Adjustparameterssuchas LACandcellcodetoensure parameterconsistencyat bothsides Adjustwirelessparameters ReplacetheCMMmodule UseLMTtocalibratetheclock Remove the transmission fault 6 Troubleshooting i Start signaling trace of OMCR performanc...

Страница 146: ...hether the transmission grounding is good enough and whether transmission alarms occur in the TIC board of BSC and the CMM at the BTS side In addition test the transmission bit error when necessary Replace the ETRM to see if faults occur to the ETRM iv If the fault is not solved after the above operations please report the fault to the local maintenance office 7 Precautions None Handling of SWR Ma...

Страница 147: ...er the alarm disappears Whether the TRM module is inserted properly Ensure good contact between the TRM module and the backplane Whether the CMM indicator is normal Replace the CMM module Whether the SWR level 1 alarm indicator on the AEM module panel is on Remove the fault of the antenna feeder system Whether the alarm disappears NO YES NO NO NO NO YES YES YES YES End Start Whether the SWR minor ...

Страница 148: ...CMM module vi Observe the level 1 alarm indicator of the SWR1 standing wave ratio on the AEM panel If it is on check the standing wave ratio of the jumper master feeder and antenna from the combiner output interface section by section until the reason why the standing wave ratio is getting worse is found Whether the connectors between the set top hopper master feeder and antenna are in poor contac...

Страница 149: ... PO O R CON V E R S AT I O N QU AL I T Y FAU L T S Start Whether the downlink signal is too low Whether the uplink signal is too poor Whether the clock is normal Whether the E1 DIP switch of the CMM is set correctly Whether the TRM AEM RF cable connection is reliable Whether the SWR level 1 alarm indicator on the AEM module panel is on Whether the output power of the PA is normal Remove the fault ...

Страница 150: ... If the output power is abnormal adjust the power control If still too low replace the ETRM Otherwise skip into Step 3 ii View the measure report from BTS If it is the uplink level difference follow the steps below to eliminate the fault Check whether the wireless parameters are configured properly from the background Focus on checking the MS maximum transmission power MSTXMAXCCH upon access in th...

Страница 151: ...ource Find the fault when making a phone call 3 Related parts Antenna feeder system parameter settings ETRM modules and environment influence 4 Analysis and locating Many technical indexes such as system frequency sensitivity and power or geography and electromagnetic environment may directly influence the coverage of the BS Normally the technical indexes of the system is comparatively stable The ...

Страница 152: ...ces in the surrounding Reduce the influence of external interference YES Check whether the TRM AEM RF cable connection is reliable Remove the TRM AEM cable connection problems NO End NO Check whether the SWR level 1 alarm indicator on the AEM module panel is on Remove the fault of the antenna feeder system NO YES YES Whether the output power of the PA is normal YES Adjust power control and replace...

Страница 153: ...e output power of PA has decreased If abnormal adjust the power control If still too low replace the ETRM vi Check whether other antennas or obstacles exist around the antenna If yes adjust the azimuth angle and height of the antenna in time to lessen the influence vii Check whether the azimuth angle and pitch angle of the antenna have changed since the deviation of them will cause smaller BS cove...

Страница 154: ...ling test 3 Related parts The connection between the ETRM and the backplane the RF cable of the ETRM and the AEM the RF cable of the dividers of the ETRM and of the AEM and ETRM modules 4 Fault analyzing and locating For the above three symptoms the respective causes that make the carrier not occupied are i According to the TCH assignment algorithm of the ZTE BSC if a time slot is assigned unsucce...

Страница 155: ...TRM module YES YES End YES YES NO NO YES 6 Troubleshooting i Observe the time slot occupancy in dynamic data management to confirm whether it has not been occupied for a long time ii At night when the traffic gets less block the TCH slots of the other carriers by blocking the logic channel iii Observe the time slot occupancy of the carrier if there are TCHs occupied stably for a long time the faul...

Страница 156: ...ly inserted in the backplane If necessary replace its location with that of another carrier 7 Precautions Be careful not to block the SDCCH channel when blocking the TCH time slots of other carriers LAPD Broken Link of BS Carrier Carrier LAPD Broken link at a Site 1 Symptom Observed from dynamic data management the carrier LAPD broken link occurs at a site 2 Source The fault is detected during obs...

Страница 157: ...ction times out YES NO Check whether E1 connection is normal YES NO Check whether BSC has board alarms YES NO Whether transmission has faults YES NO Whether the LAPD of the TRM at the same layer is broken YES NO Remove the backplane fault Reset or replace the TRM End 6 Troubleshooting i Remotely reset the CMM to reset the BS If the system indicates connection timeout the communication link from OM...

Страница 158: ...oken physical connection while the transmission bit error or poor grounding does not result in alarms Wide spread Transient Interruption of BS Carrier LAPD 1 Symptom LAPD broken link occurs in some base stations at nearly the same time and automatically gets normal in 10 20 seconds without any handling 2 Source The background O M system reports related alarms 3 Related parts Faults between MP and ...

Страница 159: ...eshooting i Check whether transmission alarms occur during LAPD interruption If yes check whether the E1 interface is contacted reliably whether faults occur in the transmission grounding whether alarms occur in the transmission equipment and eliminate the corresponding faults ii Analyze the LAPD interruption and recovery time to find the faulty LAPD board and reset it If the reset is not effectiv...

Страница 160: ...ccur on the carrier LAPD of some cells at the same time check the relations between these cells paying special attention to whether they are connected with the same LAPD board 5 The fault locating flow is as shown in Figure 74 FI G U R E 74 FAU L T LO C AT I N G FL O W CH AR T F O R LAPD BO AR D Start Reset the LAPD board YES End Whether the fault is solved Replace the LAPD board NO Analyze and co...

Страница 161: ...dover Is Abnormal 1 Symptom BS is normal but can not hand over with the adjacent cells 2 Source The fault is detected in dynamic data management 3 Related parts Handover cells of OMCR the setting of the handover parameters and the clock unit of CMM 4 Fault analyzing and locating Data or hardware faults may trouble the handover of the mobile phone i Adjacent cells are improperly set ii Improper han...

Страница 162: ...er there are clock alarms Remake adjacent cell data Use LMT to check the 13M clock and calibrate it Reset the CMM Whether handover is normal NO NO YES Whether the handover parameter is proper Whether performance indices are normal Handle them properly according to the abnormal indices NO YES 6 Troubleshooting i Check whether the performance indexes of the current cell are normal ii Check whether t...

Страница 163: ...lock outputs is within the specified range at the front panel of the BS21 V2 2 rack If abnormal use LMT to calibrate the clock 7 Precautions Introduce the precautions during troubleshooting of this fault Handling Lightning Stricken BS Faults 1 Symptom After thunder storm the BS breaks down 2 Source Find the fault through the board indicator and the alarms of the background O M system 3 Related par...

Страница 164: ... Whether the 48 DC power is normal Remove the power supply fault Replace the CMM module Remove the transmission fault YES NO YES NO NO YES NO YES 6 Troubleshooting Check the possibly damaged parts one by one i Check whether the power supply can be normally powered on and whether its 48 V power can meet the requirements ii Check whether the transmission is normal Self loop the E1 line to the BSC to...

Страница 165: ... through the transmission equipment at the BS MS Signal is not Stable in Idle State 1 Symptom In idle state the receiving signals of mobile phones fluctuate Sometimes signals suddenly disappear and appear again after a moment 2 Source Faults occur in dialing 3 Related parts The location of the mobile phone reselection parameter setting ETRM and AEM modules 4 Fault analyzing and locating Without co...

Страница 166: ...yes check the reselection relations and reselection parameter settings between cells Reset the cell reselection relations since the improper setting of it may cause the mobile phone to drop out of the network and access again ii Check whether the RF cable between the ETRM and the AEM is connected normally If abnormal please connect them again iii Test the PA output power and observe whether the te...

Страница 167: ...orking unstably it will cause the MS to present strong signals in idle state and weak signal in conversation ii Too frequent MS handover ping pong handover will cause unstable MS signals in conversation 5 The fault locating flow is as shown in Figure 78 FI G U R E 78 FAU L T LO C AT I N G FL O W CH AR T F O R UN S T AB L E MS SI G N AL S I N CO N V E R S AT I O N Reset the TRM Whether the TRM AEM ...

Страница 168: ...r the main and the diversity antennas of the abnormal cell are consistent in the orientation and pitch angle If not please adjust them in time Measure the standing wave ratio of the antenna feeder system and eliminate the symptom such as abnormal connections of the connectors of the antenna feeder system or water leakage of the feeder cable 7 Precautions None TCH Assigned with Low Success Ratio an...

Страница 169: ...tart NO YES Whether the alarm is solved Handle accordingly based on the alarm information Confirm the faulty carrier and TCH Whether the TRM AEM RF cable is reliably connected Reliably connect the TRM AEM RF cable NO YES End NO NO Whether the fault is solved Reset the TRM Replace the AEM module Replace the AEM module Whether the fault is solved YES YES 6 Troubleshooting i Select an appropriate tim...

Страница 170: ...se connect them again Reset ETRM If the problem is not solved replace the ETRM If the ETRM is normal replace the AEM 7 Precautions None MS Echo during Conversation 1 Symptom MS echoes occur in conversation 2 Source Faults occur in dialing 3 Related parts Handover parameters ETRM module 4 Fault analyzing and locating The fault is caused by i Faults occur at the echo suppressor set between PLMN and ...

Страница 171: ...lt Replace the TRM module End Whether the echo problem is solved YES NO Whether the fault occurs only when PLMN and PSTN network users are on a call Reset and replace the DRT EDRT board 6 Troubleshooting i Eliminate the MS fault which causes echoes ii Confirm whether echoes only occur on the PLMN and PSTN subscribers in their conversation If yes the EC may go wrong iii Check whether loops occur at...

Страница 172: ...ile phones 2 Source Faults occur in dialing 3 Related parts The configuration data of MSC BOSN board of BSC ETRM and AEM modules 4 Fault analyzing and locating The fault is caused by i Wrong MSC data configuration ii Wrong PCM time slot connection between BSC and MSC or BOSN time slot of BSC connection error iii The downlink field intensity is imbalanced in the marginal area covered by the BS iv T...

Страница 173: ...he connection between the receiving and transmitting antennae Whether the receiving and transmitting antennae are connected reversely Remotely reset the TRM and replace the TRM 6 Troubleshooting i Confirm the coverage where the symptom appears If it appears within the whole MSC range consider checking whether the equipment buyer or other related personnel have modified the MSC data and related cut...

Страница 174: ...ource Find the fault when observing the dynamic data management of the background O M system 3 Related parts Parameter settings of OMCR the ETRM where SDCCH is in the DIP setting of the TIC board at the BSC side 4 Fault analyzing and locating The fault is caused by i SMS problems Sending too many SMs causes SDCCH congestion ii Border problems of the location area When a cell is located on the bord...

Страница 175: ...lingtracing and re locate the fault End Remove the transmission fault YES NO Whether it is due to too frequent location updates at the LAC border Use the bit error tester to measure whether there are bit errors in transmission 6 Troubleshooting i Judge whether too many short messages cause SDCCH to be congested If yes adjust the ratio of SDCCH with TCH and add SDCCHs according to the traffic of TC...

Страница 176: ...ed in the adjacent cells as possibly as you can For example increase RxLAMin minimum receiving level allowable for access by setting it as 12 99 dBm 98 dBm or decrease the Cell Reset Offset value iv Eliminate the hardware faults Confirm whether the TIC board was replaced at the BSC side recently and check whether the DIP switch of it is configured correctly According to experiences the incorrect m...

Страница 177: ...ldings will cause the mobile signals to attenuate rapidly and handover not to be done in time which results in call drop The incomplete definition of the adjacent cells causes the MS to be held in the current cell If the MS is beyond the coverage border of the cell call drop will occur vi Call drop due to handover The lower handover limit IRXLEVULH and IRXLEVDLH are configured too high When the re...

Страница 178: ... BCCH and SDCCH of the cell are sent out from the two different antennas Different pitch angles of the two antennas will cause their different coverage That is the MS can receive the BCCH signal but can not occupy the SDCCH sent out by the other antenna when initiating calls which results in drop out The main and diversity antennas are equipped in all cells when a base station is installed When th...

Страница 179: ...tenna direction angle and the elevation angle Whether there are new obstacles in the surrounding Adjust the antenna direction angle and the elevation angle YES NO NO NO YES Remove the transmission fault Block the TCH channel of other carriers Whether the carrier can be occupied for a short time Whether divider TRM RF cable connection is reliable Remove the divider TRM connection problem NO Remotel...

Страница 180: ... two RXs of ETRM are reliably connected with the RF of the divider v Observe the level 1 alarm indicator of the SWR1 standing wave ratio on the AEM panel If it is on test the standing wave ratio of the combiner output interface If abnormal go on to check the standing wave ratio of the jumper master feeder and antenna section by section until the reason why it gets worse is found Whether the connec...

Страница 181: ...C h a p t e r 7 Collection of Maintenance Experience In this chapter you will learn about Reference for wireless parameters adjustment during commissioning Analysis of bird928 mobile phone s failure to access the network Configuration method for intra cell handover ...

Страница 182: ...is way the results of cell reselection and of cell switchover are similar The detailed configuration of the adjacent cells list can base on the network planning data Generally it is estimated that the cell will be arranged tidily like a beehive but actually because the location of the site will be affected by many factors the cell almost can not be arranged tidily As a result the adjacent cell lis...

Страница 183: ...en route test can not be conducted Never configure all the cells as the adjacent cells in the adjacent cell list Currently many unexpected cell reselection and handover will appear due to great transmitting power of the cell complicated radio transmission environment and imperfect network plan And if the constructed network involves the dual band the situation will be more complicated But generall...

Страница 184: ... T E R S CO N F I G U R AT I O N Parameter Original Default Value Adjusted Value Description Minimum receiving level 105 dBm 100 dBm Currently great transmitting power of the cells causes too large overlapped coverage area between the adjacent cells Add this parameter to artificially reduce the valid coverage area of the cell and enhance the successful perfect access of the mobile phone For the ou...

Страница 185: ...le of the measurement value to decrease the sensitivity to the signal fluctuation Power threshold s plus intensity N P 1 1 3 2 Adjust this value to decrease the sensitivity to the signal fluctuation Power threshold s minus intensity N P 1 1 3 2 Adjust this value to decrease the sensitivity to the signal fluctuation Others For a normal system the default value of the timer is a little large which m...

Страница 186: ...evant services while the Bird928 mobile phones with some other versions work normally Through experiment we can discover if MSPower value is set as 5 namely 33 dBm in the instant assignment the mobile phone can work normally However if MSPower value is set as 0 namely 39 dBm in the instant assignment the Bird928 mobile phones of some versions cannot work normally According to the GSM05 05 specific...

Страница 187: ... reported by the mobile phone so the BS cannot know the supportable maximum power of the mobile phone and thus supposes this value is 39dBm After receiving this information even if this output power is beyond the capability of it the mobile phone will output its maximum power The Bird928 mobile phones with some versions work in this way and work normally But the Bird928 mobile phone with some othe...

Страница 188: ...reasing downlink quality power decreasing uplink quality and power decreasing downlink quality as under Power adjustment threshold as 0 the other parameters remain unchanged 2 Click Wireless Resource Management Æ Handover Control Parameter Setup and set the values of both uplink strength and downlink strength as 0 the values of both uplink quality and downlink quality as 1 the values of both uplin...

Страница 189: ...be used when modules are inserted or unplugged Connect the anti static wrist strap to the grounding terminal of the rack And never touch the grounding terminal after connection There is a 1MΩ resistor connected in serial between the anti static wrist strap and grounding terminal and any touch to the grounding terminal may cause a bypass of this resistor 3 When holding a module by hand make sure no...

Страница 190: ...ine the fault and whether it is necessary for a replacement ii Prepare a good spare part with the same type as that of the faulty module iii Prepare anti static bags damp proof bags and cartons as well as some labels for the purpose of identification 3 Procedure i Power off the CMM module ii Put on the anti static wrist strap properly iii Loosen the fix screw on the CMM panel and pull the handle o...

Страница 191: ...rt with the same type as that of the faulty module iii Prepare anti static bags damp proof bags and cartons as well as some labels for the purpose of identification iv Record the RF cables location on the front panel of the module to be replaced for inserting these cables back after the module replacement 3 Procedure i Power off the ETRM module on PSM ii Put on the anti static wrist strap properly...

Страница 192: ... Straight screwdriver 2 Preparation i Perform the fault observation and analysis and determine the fault and whether it is necessary for a replacement ii Prepare a good spare part with the same type as that of the faulty module iii Prepare anti static bags damp proof bags and cartons as well as some labels for identification iv Record the cable locations such as RF cables and feeder jumpers on the...

Страница 193: ...ty and the relevant unit service is not resumed This represents an unsuccessful replacement Please check again whether the spare part is damaged or whether the fault is caused by this module Carriers are allowed to view the failure causes through the alarms at the foreground and background PSM Replacement 1 Tools Anti static wrist strap Straight screwdriver 2 Preparation i Perform the fault observ...

Страница 194: ...ule meanwhile the fan is normally started on the front panel which indicates the PSM main module is already working normally otherwise it is necessary to find out the PSM failure cause and switch on again all the breaker switches of relevant modules on the PSM front panel If the power indicators of all the modules are on in green it means PSM module power output is completely normal otherwise it i...

Страница 195: ...k of the rack Since the backplane replacement may influence the communication in a cell so the approval from the office and relevant technical personnel before the replacement is necessary 1 Tools Anti static wrist strap Cross screwdriver 2 Preparation i Perform the fault observation and analysis and determine the replacement is necessary ii Prepare a good spare part with the same type as that of ...

Страница 196: ... layer and start the system 4 Confirmation after replacement When the backplane is replaced and system is powered on the system will load module versions And there is a self test process before versions formally run And if the self test is successful the indicators are normally lit and the services are resumed This indicates a successful replacement If the module self test fails it will perform th...

Страница 197: ...ing in the future vii Connect the two 3 core aerial socket power cables with the heat exchanger reliably viii Power on the new heat exchanger again 4 Confirmation Observe if the cyclic fan in the heat exchanger works normally If yes lift the top boot onto the cabinet and use the 4 M6 bolts to fasten it and finally lock the front back doors The replacement is completed Trunk Cable Replacement 1 Too...

Страница 198: ...mation after replacement Check whether the RF connector of the trunk cable is plugged and connected properly and reliably If it is normally bind them with cable clips in accordance with the binding process of the old trunk cable 5 Precautions i During this process make sure that the insulation layer of the digital trunk cable is not damaged ii Replacing the trunk cable will not interrupt the BTS s...

Страница 199: ... identification and handling in the future iv Connect the new RF cable according to the former connection method Note During the operation process make sure to use force evenly When screwing the SMA connector never use violent force the correct method is to screw the SMA connector with proper force and at the same time rock it to left and right to make it align with the socket and avoid damaging i...

Страница 200: ...ct the RF cable between the corresponding AEM and the cabinet bottom to prevent AEM from being damaged due to the short circuit of the jumper or feeder at the bottom of the cabinet iii Remove the jumper connector remove the feeder connector and then remove the old lightning arrestor iv Put the replaced faulty lightning arrestor in a damp proof bag label it and mark the type and fault Store it prop...

Страница 201: ...emove the jumper by an adjustable wrench and then remove connectors at its two ends to check whether the connectors are faulty if they are perfect use them again iii Put the replaced faulty jumper in a damp proof bag label it and mark the type and fault Store it properly in the carton Label the carton for easy identification and handling in the future iv Cut a proper length of jumper according to ...

Страница 202: ...all to check whether the BS runs normally after the replacement Tower Top 1 2 Soft Jumper Replacement 1 Tools i LDF4 block cutting device ii LDF4 block installation tools iii Adjustable wrenches 2 iv Hacksaw v Assorted file vi Paper knife vii Adjustable hot air blower viii Multimeter ix Antenna feeder analyzer x Tools for safely climbing 2 Preparation i Perform the fault observation and analysis a...

Страница 203: ...el on the ground vi Install the new jumper and test the antenna feeder indexes Receiving transmitting jumpers Lay the new tower top jumper to the transmitting antenna and 7 8 feeder connect the connectors make waterproof bends and then measure the cabinet top jumper for the antenna feeder performance indexes by an antenna feeder analyzer SITE MASTER Diversity reception jumper Connect jumpers make ...

Страница 204: ...justable wrench and then check whether the connectors cores are broken iii Put the replaced faulty jumper a damp proof bag label it and mark the type and fault Store it properly in the carton Label the carton for easy identification and handling in the future iv Make a new connector in the way as described in the manual for making connector in the package of the connector v Test the newly made con...

Страница 205: ...er radius Insulating tapes should be wrapped from the bottom to the top in case of rainwater leaking vii Power on all the ETRM modules on the PSM module panel 4 Confirmation after replacement i Observe the running status of the ETRM and the AEM If the indicator is normal the replacement is basically successfully ii Make a test call to check whether the BS runs normally after the replacement Tower ...

Страница 206: ...th the lifting tools v Fix it on the fixing clamp vi Connect end IN of the tower amplifier to the antenna jumper and end OUT to the 7 8 feeder jumper Reverse connection is forbidden vii At the receiving interface of the AEM use the current gear of the multimeter to measure whether there is 60mA 200mA current And then make waterproof treatments to the connectors Note Put two ends of the tower ampli...

Страница 207: ...carton for easy identification and handling in the future iv Carefully lift the new antenna installation tool and auxiliary materials to the destination location by the lifting tools Note While lifting the antenna the personnel on the ground can pull outside the lifting rope to avoid the collision with the tower or other hard objects And ensure the personal safety The personnel high above the grou...

Страница 208: ...ign requirement and then fix the pitch angle adjustment device Finally distribute the jumpers vi Test the performance indexes of the antenna feeder After the installation measure the BRS cabinet top jumper for indexes of the antenna feeder performance by an antenna feeder analyzer SITE MASTER If the receiving channel has a tower amplifier use the current gear of the multimeter to measure whether t...

Страница 209: ... Proprietary Information of ZTE CORPORATION 195 A p p e n d i x B Common Maintenance Tables Daily Maintenance Record Table Site No Site Name Operation Item Running Status of the Equipment and Handling Operator Remarks ...

Страница 210: ...r BTS for GSM Maintenance Manual 196 Confidential and Proprietary Information of ZTE CORPORATION Weekly Maintenance Record Table Site No Site Name Operation Item Running Status of the Equipment and Handling Results Operator Remarks ...

Страница 211: ... Maintenance Tables Confidential and Proprietary Information of ZTE CORPORATION 197 Monthly Maintenance Record Table Site No Site Name Operation Item Running Status of the Equipment and Handling Results Operator Remarks ...

Страница 212: ... BTS for GSM Maintenance Manual 198 Confidential and Proprietary Information of ZTE CORPORATION Biannual Maintenance Record Table Site No Site Name Operation Item Running Status of the Equipment and Handling Results Operator Remarks ...

Страница 213: ...TION 199 Emergency Failure Record Table Office name Handler Time of occurrence Time of handling Source Reported by users on the call Alarm system Detected in daily routine maintenance Other sources Failure types Description of the Failure Handling method Result Opinion of the person in charge ...

Страница 214: ...ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual 200 Confidential and Proprietary Information of ZTE CORPORATION This page is intentionally blank ...

Страница 215: ...ed network testing tool that every network operation manager and network maintenance engineer must have 1 In idle status It can measure the BCCH of the serving cell and the data of six adjacent cells i Channel number ii Receiving level iii BSIC iv Receiving threshold level v Country and carrier code of the serving cell 2 In conversation status It can measure the data of the serving cell and six ad...

Страница 216: ...ll handover handover no handover handover once and cyclic handover viii Accessing the CELL_BAR cell 4 Information displayed on the counter i RLT ii T3212 iii Times of handover iv TMSI Kc and so on Operation Description Key Description C Return to previous menu Upper item V Next item OK Select 1 9 Shortcut keys How to Enter the Root Menu Method 1 Press MENU 4 4 V and in turn Method 2 Press or Metho...

Страница 217: ...he main menu to select menu 1 and press OK or directly press 1 to access the IMEI menu The screen displays the IMEI code the software version and the internal reference value To return to the main menu press C 2 Menu 2 LOAD PROM loading software Select this menu to load programs on the PC through a special software Press or V under the main menu to select menu 2 and press OK or directly press 2 to...

Страница 218: ...ss the NETWORK menu of idle status Press or V under the main menu to select menu 3 and press OK or directly press 3 to access the NETWORK menu where there is a call outgoing call or incoming call In idle status the network data of the serving cell Its screen display is as shown in Figure 86 FI G U R E 86 SCR E E N 1 O F NET W O R K DAT A O F SE R V I NG CE L L I N ID L E ST AT U S CH 0118 RM 104 R...

Страница 219: ... four hexadecimal numbers LAI abcd ef ghijk Location area identification where abcd is the county code in a 4 digit number ef is the carrier code in a 2 digit number ghijk is the location code in a 5 digit number Display of the network data of 6 adjacent cells in idle status After V is pressed the display will be as shown in Figure 88 FI G U R E 88 SCR E E N 3 O F NET W O R K DAT A O F SE R V I NG...

Страница 220: ...jk 1 8bit special offset value of the adjacent cell STAT the standby status Press V to page down to the No 15 screen at idle status This screen is not used and is a blank page Display of the network data of the serving cell in call status Its screen display is as shown in Figure 90 FI G U R E 90 SCR E E N 1 O F NET W O R K DAT A O F SE R V I NG CE L L I N COM M UN I C AT I O N ST AT U S CH 0118 PL...

Страница 221: ... use N NO RFBCCH RF channel number used by the BCCH of the current cell ranging from 1 to 124 RXBCCH The BCCH receiving level of the serving cell in communication mode RX_LEV_SERVING_CELL with the value range of 110dBm 11dBm BSIC ab The Base Station Identity Code of the adjacent cell where A represents the code of the carrier ranging from 0 to 7 b represents the cell color code ranging from 0 to 7...

Страница 222: ... 8bit special offset value of the adjacent cell STAT the standby status Press V to page down It is the last screen at the dedicated status Screen 15 displays additional data about frequency hopping for example HSN MAIO Frequency number hopping mode A or C is random or periodic 0 and 6 frequency tables For example 00 23 4 A 1 00 MAIO 23 HSN 4 Nb Freq A Random 1 Cyphening active 077 088 124 110 Ther...

Страница 223: ...lies with GSM recommendation Inversion mode The mobile only camps on barred cells Activation mode The mobile camps on barred and non barred cell NEGAT CI This function allows this mobile phone stay in the cell when its CI is less than 0 PWR CLASS It defines the power level of this mobile phone Two options are provided 2W CLASS 4 or 0 8W CLASS 5 For the later case its own power of the mobile phone ...

Страница 224: ...enu 7 COUNTERS counting function This menu can display a special count value Under the main menu press or V to select menu 7 and then press OK or directly press 7 to enter the TRACE menu This menu provides several options as shown in Figure 96 FI G U R E 96 COUNTERS ME N U RLT T3212 HANDOVER TMSI CYPHR COUNTERS RLT T3212 Display the link timeout value maximum repeat counter and current value and m...

Страница 225: ... current serving cell Left Viewing the information of the previous screen Clear Returning to the serving cell How to Enter Engineering Mode After start the device input 983 3641 to start the engineering mode How to Close Engineering Mode Input 983 3640 to close the engineering mode Instructions of Engineering Mode Menu 1 Parameters of the serving cell in idle status are described as below Screen 1...

Страница 226: ...special users EMER Emergency calls Whether supporting the emergency call BPA BsPaMfrms The quantity of the multi frame used in a paging period CELLBAR Cell bar access Whether the cell bars the access Screen 4 RET Max re transmissions The maximum value of the re transmissions received and this value can not be too high RLA Receive level access minimum The minimum level of the receiving cell AG Acce...

Страница 227: ...ower control ECS Early Class Mark Control 1 Require sending the class mark in advance Screen 7 CBCH Parameters of cell broadcast channels 2 Parameters of the adjacent cells in idle status Screen 1 A Cell Absolute Radio Frequency Channel Number frequent channel number L Cell level Index of the current cell Received level Number of the adjacent cell C2 C2 of current Ncell C2 value of the current adj...

Страница 228: ...TA_9600 D9600 CHM_DATA_4800_FULL D4800F CHM_DATA_2400_FULL D2400F CHM_DATA_4800_HALF D4800H CHM_DATA_2400_HALF D2400H HSN MAIO Hopping serial number Mobile allocation offset 4 Parameters of the adjacent cell in dedicated status Screen 1 A Cell Absolute Radio Frequency Channel Number Frequency channel number L Cell level L Index in the array Cell level Serial number of the adjacent cell B Base Stat...

Страница 229: ...W 3 Measure the forward power i Choose a measurement point between the cabinet top jumper and lightning arrestor to measure BTS output power and the connection relationship is shown in Figure 98 ii If the antenna feeder is not installed a matching load should be added for the measurement of the forward power as shown in Figure 99 iii Correctly connect the lightning arrester and the 7 8 inch main f...

Страница 230: ... I N G LO AD ME AS U R I N G FO R W AR D PO W E R Power output TO load Attention 4 Read the forward power value For the 50W probe one step on the dial plate represents 1W 5 Measure the reverse power i Choose a measurement point between the cabinet top jumper and the lightning arrestor to measure BTS output power and the connection relationship is as shown in Figure 98 ii If the antenna feeder is n...

Страница 231: ...ted turn on the carrier power to resume transmission Note When you measure the reverse power you must replace the power range For a qualified antenna feeder system its reverse power is small at measurement so you must replace the measurement range for a higher accuracy 6 Read the reverse power Note The forward direction is the direction to the antenna the reverse direction is the direction to the ...

Страница 232: ...N BLOCK 2 MESSAGE BLOCK 3 SOFTKEY LABELS 4 SOFTKEYS 5 FRENQUENCY SPAN AMPLITUDE KEYS 6 INSTRUMENT STATE 7 COPY 8 CONTROL 9 MARKER 10 WINDOWS 11 DATA STEP KNOB KEYS 12 INPUT 5013 PROBE PWR 14 CAL OUT 15 VOL INTEN INTENSITY 16 100 MHZ COMB OUT 17 MEMORY CARD READER 18 RF OUT 50 19 LINE Usage 1 RF MONITOR function i Connect the peripheral cables according to the range of the signal to be measured as ...

Страница 233: ...s Direct input Press FREQUENCY 5 and then the prompt for the frequency value to be input will be displayed in the ACTIVE FUNCTION BLOCK 1 area and then input the data and unit through pressing DATA 11 Input by adjusting KNOB 11 On the base of the current frequency value KNOB forward or backward until it reaches the value needed SPAN and AMPLITUDE also can be set in the same ways When use the knob ...

Страница 234: ...ii The functions related to TRACE in the CONTROL 8 area can be used to measure the unstable RF signals Set the MAX signal as HOLD IN TRACE A Set the MIN UNSTABLE RF signal as HOLD IN TRACE C Observe the real time UNSTABLE RF signal from TRACE B The transmission paths of the unstable RF signal are shown in Figure 103 FI G U R E 103 TR AN S M I S S I O N PAT H O F RF SI G N AL TRACE A TRACE B TRACE ...

Страница 235: ...andwidth xi The judgment condition is half of the 60DB bandwidth of the big signal is not less than the frequency interval between two signals You also can use the method of setting UP LOW LIMIT LINE during the observation FI G U R E 105 IL L U S T R AT I O N F O R ME T H O D O F UP LOW LIMIT LINE PASS UP LINE LOW LINE SIGNAL Make the signal to be tested into a template and the spectrum analyzer w...

Страница 236: ...M modulation signals the related test functions in the MEAS USER menu of the spectrum analyzer will be used You also can demodulate these signals to observe the audio and video signals or connect a HEADPHONE to monitor the voice ii For the use of the FFT Fast Fourier Transform to observe the frequency spectrum and other related functions please refer to the user s manual of the HP spectrum analyze...

Страница 237: ...Press MODE and select DTF SWR with UP DOWN and right Enter 2 Press F1 and F2 to select the frequency band to be tested 3 Press START CAL for zeroing before the test i Connect the short calibration terminal OPEN to RF REFLECTION on the backplane and press ENTER ii Connect the open circuit calibration terminal SHORT with RF OUT and press ENTER to perform load calibration 4 Select SAVE SETUP to save ...

Страница 238: ...ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual 224 Confidential and Proprietary Information of ZTE CORPORATION This page is intentionally blank ...

Страница 239: ... rate in the signaling channel of the wireless system in busy hour G2 1 5 G2 reflects the quality situation of the radio system signaling channel SDCCH of the Unicom GSM mobile network with the radio subsystem of the local network as the statistics point G2 Total times of call loss in signaling channel SDCCH in busy hour Total utilization times of signaling channel SDCCH in busy hour 100 3 Call lo...

Страница 240: ...less than 0 1 Erlang 100 Definition of the bad cell A bad cell is the cell having a call drop rate including handover of the voice channel greater than 3 and a average traffic per channel not less than 0 1 Erlang while less than 0 6 Erlang Call drop rate including handover of the voice channel in busy hour total call drop times of the voice channel in busy hour total utilization times including ha...

Страница 241: ...annel BER Bit Error Rate BFI Bad Frame Indication BIE Base station Interface Equipment BP Burst Period pulse BSC Base Station Controller BSIC Base Station Identify Code BSS Base Station Subsystem BTS Base Transceiver Station CCCH Calling Control Channel CCH Common Channel CELL Cellular CELP Code Excited Linear Prediction Coding CHP Channel Processor C I Carrier to Interference Ratio CIP Carrier In...

Страница 242: ...r EDGE FACCH Fast Associated Control Channel FB Frequency correction Burst FCCH Frequency Correction Channel FCLK Frame Clock FCS Frame Check Sequence FDMA Frequency Division Multiplex Access FN Frame Number FU Frame Unit FUC Frame Unit Controller GGSN Gateway GPRS Support Node GMSK Gaussian Minimum Shift Keying GPRS General Packet Radio Service GSM Globe System for Mobile communication HDB3 High ...

Страница 243: ...tch System MTBF Mean Time Between Failures NB Normal Burst NRZ Non Return to Zero coding OAMM Operational And Maintenance Module OBCLK Octet Binary clock OMC Operation and Maintenance Center PA Power Amplifier PACCH Packet Associated Control Channel PAGCH Packet Access granted Channel PAGCHM PCH AGCH Management PAU Power Amplifier Unit PBCCH Packet Broadcast Control Channel PCCCH Packet Common Con...

Страница 244: ...ent RSL Radio Signal Layer RX Receiver SACCH Slow Associated Control Channel SAPI Service Access Point Indicator SB Synchronization Burst SCH Synchronization Channel SDCCH Stand Alone Dedicated Control Channel SGSN Serving GPRS Support Node SI System Information SID Silence Descriptor SMC Short Message Center SNDCP Subnetwork Dependent Convergence protocol SPAU Super Power Amplifier Unit STRM Supe...

Страница 245: ...TE CORPORATION 231 Abbreviation Full Name TPU Transceiver Process Unit TRM Transceiver Module TRX Transceivers Time Slot TS TX Transmitter Um Um USF Uplink State Flag VCO Voltage Control Oscillator VLR Visitor Location Register VSWR Voltage Standing Wave Ratio ...

Страница 246: ...ZXG10 BS21 V2 2 Compact Outdoor BTS for GSM Maintenance Manual 232 Confidential and Proprietary Information of ZTE CORPORATION This page is intentionally blank ...

Страница 247: ...4 Please Select Time 34 Figure 25 Daily Performance Report Display Result 34 Figure 26 Performance Report Wizard 35 Figure 27 Select NM Domain and Report Type 36 Figure 28 Performance Report Wizard 1 36 Figure 29 Please Select Analyzed Objects 37 Figure 30 Performance Report Wizard 2 37 Figure 31 Daily Traffic Report Display Result 38 Figure 32 Alarm Management Selecting Alarm History Query Interf...

Страница 248: ...ate 152 Figure 78 Fault Locating Flow Chart for Unstable MS Signals in Conversation 153 Figure 79 Fault Locating Flow Chart for Low TCH Assignment Success Ratio and Phones Being Difficult to Get Through 155 Figure 80 Fault Locating Flow Chart for MS Echoes in Conversation 157 Figure 81 Fault Locating Flow Chart of Unidirectional Mobile Phone Calls 159 Figure 82 Fault Locating Flow Chart of SDCCH B...

Страница 249: ...Module Panel 64 Table 11 Relationship between Indicator Bit Display and Number of Activated TS 65 Table 12 Abnormal Status of Indicators on ETRM Module Panel 66 Table 13 Normal Status of Indicators on CDU Module Panel 68 Table 14 Abnormal Status of Indicators on CDU Module Panel 68 Table 15 Dividing Alarm Levels 86 Table 16 Summary Table of Alarms 87 Table 17 Common Faults of BS21 V2 2 Device 128 ...

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