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™150-402-102-01S¨

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150-402-102-01

Model

List Number

Part Number

HRU-402

150-1592-02

Summary of Contents for 150-1592-02

Page 1: ...HIGAIN REMOTE UNIT PAIRGAIN TECHNOLOGIES INC ENGINEERING SERVICES TECHNICAL PRACTICE 150 402 102 01S SECTION 150 402 102 01 Model List Number Part Number HRU 402 2 150 1592 02 ...

Page 2: ...ined in this document is company private to PairGain Technologies Inc and shall not be modified used copied reproduced or disclosed in whole or in part without the written consent of PairGain Other product names mentioned in this practice are used for identification purposes only and may be trademarks or registered trademarks of their respective companies Revision Release Date Revisions Made 01 Ju...

Page 3: ...02 List 2 July 27 1998 iii USING THIS MANUAL Two types of messages identified by icons appear in the text Notes contain information about special circumstances Cautions indicate the possibility of equipment damage or the possibility of personal injury ...

Page 4: ...Using This Manual 150 402 102 01 Revision 01 iv July 27 1998 HRU 402 List 2 ...

Page 5: ... Inspecting Your Shipment 10 Installing the HRU 402 List 2 10 Installation Test 12 Front Panel Messages 13 Connecting to a Terminal Emulator 15 Using the Maintenance Terminal __________________________ 18 Login 18 Navigating the HRU Maintenance Menus 20 System Spans 20 Navigation Keys 21 HRU Maintenance Terminal Main Menu 22 View Span Status 23 Set Clock 27 System Settings 28 Loopback Menu 30 View...

Page 6: ...mote DS1 Alarm RDA Option 46 Alarm Pattern Option ALMP Option 47 DS1 Line Code Auto Option 47 Functional Description 48 Operational Capabilities 48 Local and Line Powering 49 Simplex Sealing Current Information 50 Loopback Design Description 51 SAIS Set to ENA 53 SAIS Set to DIS 53 Appendix B Abbreviations _______________________________55 Appendix C Product Support _____________________________58...

Page 7: ...n Status Screen for Non doubler Applications 24 Figure 12 Span 5 Status Screen for Four Doubler Applications 25 Figure 13 Set Clock Screen 27 Figure 14 System Settings Screen 28 Figure 15 Loopback Screen Without Doublers 31 Figure 16 Loopback Screen with Four Doublers 32 Figure 17 Performance Data Screen 34 Figure 18 Span 5 Performance Data Screen 35 Figure 19 Performance History Screen for Non do...

Page 8: ... Components 9 Table 4 HLU 231 List 8 Four Character Front Panel Messages 13 Table 5 Maintenance Terminal Navigational Keys 21 Table 6 Maintenance and Remote Terminal Menus 22 Table 7 Span Status Fields and Descriptions 26 Table 8 System Settings Fields and Descriptions 29 Table 9 Loopback Field Messages and Descriptions 33 Table 10 Alarm History Fields and Descriptions 39 ...

Page 9: ...two unconditioned copper pairs over the full Carrier Service Area CSA range See the section titled Applications on page 3 for HiGain doubler and doubler compatible line units that can be used with the HRU 402 List 2 Figure 1 shows a basic HiGain configuration for a T1 High bit rate Digital Subscriber Line HDSL circuit The HLU is installed at the Central Office CO shelf The HRU 402 List 2 is housed...

Page 10: ...ing current Lightning and power cross protection on HDSL and DS1 interfaces 784 kbps full duplex 2B1Q HDSL Transmission on two pairs DS0 blocking Compatible with PairGain 1 x 1 Protection Switching System Narrow SLIM mechanics half width 400 mechanics Lower Power Consumption Supports one to four span line powered and five span local powered circuits Ultra Low Wander Improved DS1 Auto Mode Local Li...

Page 11: ... and 1 dB for each cable gauge change HiGain systems operate with any number of other T1 Plain Old Telephone Service POTS or other HiGain systems sharing the same cable binder group can be used with customers requiring T1 service on a temporary or permanent basis provide a means of quickly deploying service in advance of fiber optic transmission systems are easily installed allowing service to be ...

Page 12: ...0 402 102 01 Revision 01 4 July 27 1998 HRU 402 List 2 also be used with the following line and doubler units for four and five span applications HLU 231 List 8x HLU 319 List 5x HLU 388 List 8x HDU 409 HDU 407 or HDU 404 ...

Page 13: ...duct Overview HRU 402 List 2 July 27 1998 5 PRODUCT DESCRIPTION Front Panel Figure 2 and Table 2 identify the remote unit front panel components Table 2 also describes the functions of the front panel components Figure 2 Front Panel ...

Page 14: ...button in again for five seconds or by the standard loopdown coded messages Also provides the ability to control NREM a DS1 Code LEDs Indications for DS1 code options B8ZS DS1 Code Option B8ZS Solid green indicates that the DS1 line code option is set to Bit 8 Zero substitution B8ZS The solid green light does not indicate the actual DS1 line code being received which may be Alternate Mark Inversio...

Page 15: ... loop Extraction Handle Handle used to remove the HRU 402 List 2 from the remote enclosure DS1 RCV Level LVL Switch Sets DS1 RCV level 0 Sets the DS1 receive level towards the CI to 0 dB 15 Sets the DS1 receive level towards the CI to a 15 dB Transmit Loss of Signal TLOS Loopback LB Switch Enables or disables TLOS loopback option DIS Disables the TLOS option EN Enables the TLOS option Bar Code Lab...

Page 16: ...RR and Local Power LPWR are located at the back of the printed circuit board adjacent to the card edge connector as shown in Figure 3 For the sealing current option you can choose to either disable or enable the current flow over the HDSL pairs see Table 3 For the Local Power option you can choose to either force the HRU to use local power or line power See Local and Line Powering on page 49 and S...

Page 17: ...ndicated by a CHREV message in the ALARMS line of the SPAN STATUS Maintenance screen Allows the flow of simplex sealing current over the HDSL pair towards the upstream unit The local power option LPWR must also be set to ENA to allow sealing current to flow Local Line Power Rear Unit Switch S1 DIS a Forces the HRU to its Line Power mode where it obtains its power from the upstream line unit over t...

Page 18: ...C Product Support on page 58 for more information Your shipment should consist of One HRU 402 List 2 PairGain Technologies HiGain Remote Unit 402 List 2 technical practice INSTALLING THE HRU 402 LIST 2 The HRU 402 List 2 mounts in the following shelves indoor use HRE 420 single wide single mount HRE 422 double wide double mount HRE 425 12 slot wall or rack mount HRE 427 seven unit wall or rack mou...

Page 19: ...ote unit into the card guides for the desired slot then push the unit into the enclosure until it is seated in the card edge connector Figure 4 HRU 402 Installed in a Remote Enclosure 3 Push the unit into the card edge connector until it is entirely within the card guide The unit should snap into place indicating that the unit is properly seated ...

Page 20: ...pback state Also verify if possible that the HLU displays the message NREM which also indicates that the HRU 402 List 2 is in loopback 3 Have the CO tester transmit a T1 test signal into the HLU and measure that the returned looped signal is error free 4 If the above test fails remove the remote unit from its loopback state by again pressing the loopback button for five seconds Verify that the LBK...

Page 21: ... at the HLU CLOC Customer Local Loopback Signal from customer is looped back to customer at the HRU NREM NetworkRemote Loopback DSX signal is looped back to DSX at HRU SMJK Remote SmartJack Loopback Signal from DSX is looped back at HRU by the HRU SmartJack TLOS Transmit Loss Of Signal HRU is in a logic loopback state caused by a loss of its T1 input from the CI if enabled at the HRU by its TLOS s...

Page 22: ...op 1 or Loop 2 The 3rd Doubler and either HRU or 4th Doubler multiplexers are trying to establish synchronization with each other on loops 1 or 2 of span 4 A5L1 or 2 Acquisition 5 Loop 1 or Loop 2 The 4th Doubler and HRU multiplexers are trying to establish synchronization with each other on loops 1 or 2 of span 5 H1ES HDSL CRC Error Channel 1 HLU HDSL Loop 1 CRC error H2ES HDSL CRC Error Channel ...

Page 23: ...e HDSL loops has been grounded BAD RT No response from HRU The HLU does not receive any response from the HRU Thus the HRUs integrity is questionable FRM Frame SF ESF UNFR NONE Defines the type of frame pattern being received from the DSX 1 Displayed during System Settings mode defined above VER HLU Software Version Displayed during the System Settings review mode by pressing the Mode button at th...

Page 24: ...able is connected to the Craft port RS 232 DB 9 connector on the HRU 402 List 2 connect the other end of the cable to the 9 pin COM port RS 232 of the maintenance terminal Figure 6 The maintenance terminal is configured as Data Circuit Terminating Equipment DCE HRU 402 DB 9 Connector DCE RD Receive Data TD Transmit Data 2 3 5 DB 9 Connector DTE DB 25 Connector DTE Maintenance Terminal Maintenance ...

Page 25: ...inal to the following communication settings 1200 to 9600 baud 9600 baud is recommended Parity None 8 data bits 1 stop bit Hardware Flow Control set to None VT Terminal Emulation If using the Microsoft Windows terminal emulation program from the Settings Terminal Preference menu you must deselect Show Scroll Bars and Use Function Arrow and Ctrl Keys for Windows ...

Page 26: ...isplay the login screen The initial remote unit session after power up is always Local Login Figure 7 shows the main menu of a local session The main menu heading HiGain HRU 402 Maintenance Terminal Main Menu identifies the screen as a Local Login session However after the remote unit and HLU establish synchronization the port interface will reset to a remote session First generation HLUs do not s...

Page 27: ...iate a RS 232 session This is necessary because a HiGain circuit can only support one RS 232 session at a time An active session at any module prohibits active sessions at all other circuit modules Figure 7 Local Login Main Menu Screen The HRU 402 List 2 automatically performs a remote logoff if no activity at the keyboard is detected after 5 minutes This prevents remote sessions that were not pro...

Page 28: ... The HRU Maintenance Terminal menus allows the user to monitor multi span applications from the HLU to the HRU Figure 9 System Spans RRRRR EEEEEE M M OO TTTTTTT EEEEEEE R R E MM MM OO OO T E RRRRR EEEEEE M M M O O T EEEEEE R R E M M OO OO T E R R EEEEEE M M OO T EEEEEEE BY PAIRGAIN TECHNOLOGIES HIT ENTER TO LOG IN HiGain Doubler D1 HiGain Doubler D2 HiGain Doubler D3 HiGain Doubler D4 HiGain Remot...

Page 29: ...al keyboard to navigate within the HRU 402 List 2 Maintenance menus Table 5 Maintenance Terminal Navigational Keys Key Function Logs into the Remote Terminal menus Exits the current menu Updates a report Selects the next Span Status screen Selects the previous page of a report Selects the next page of a report Clears the current values Selects the default settings ...

Page 30: ...onnected to the HLU 231 List 7B Allows system loopbacks to be initiated Loopback Menu on page 30 View Performance Data Provides access to submenus that allow you to view the Errored Seconds ES and Unavailable Seconds UAS between the HLU and the span non doubler applications and the available spans doubler applications in 15 minute intervals over a 4 hour time period View Performance Data on page 3...

Page 31: ...o the HRU The screen shows information about HDSL Loops 1 and 2 DS1 interface Loopbacks Alarms Local power Time and date From the Remote Terminal Main Menu type The Span Status screen displays HI GAIN HLU 231 REMOTE TERMINAL MAIN MENU ver V6 x 8 CIRCUIT ID A VIEW SPAN STATUS C SYSTEM SETTINGS D LOOPBACK MODE NONE E VIEW PERFORMANCE DATA F VIEW PERFORMANCE HISTORY G VIEW ALARM HISTORY H VIEW SYSTEM...

Page 32: ...ss to update the current values TIME 00 14 11 SPAN STATUS DATE 02 02 98 Circuit ID ALARMS NONE LOOPBACK OFF POWER LEVEL LOW HLU HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 21 17 21 20 17 21 21 18 21 20 18 21 dB PULSE ATTN 19 19 19 19 dB INS LOSS 23 23 23 23 dB PPM OFFSET 00 00 06 05 ppm 24 HOUR ES 00002 00004 00005 00007 seconds 24 HOUR UAS 00016 00013 00...

Page 33: ... to clear the current values 3 Press to update current values 4 Press to view the next available span TIME 00 14 11 SPAN 5 STATUS DATE 02 02 98 Circuit ID ALARMS NONE LOOPBACK OFF POWER LEVEL HIGH HDU4 HRU HDSL 1 HDSL 2 HDSL 1 HDSL 2 cur min max cur min max cur min max cur min max MARGIN 21 21 21 21 21 21 21 21 21 21 21 21 dB PULSE ATTN 19 19 20 19 dB INS LOSS 23 23 25 23 dB PPM OFFSET 00 00 17 17...

Page 34: ...l than the 196 kHz loss INS Loss Indicates the approximate attenuation of the HDSL loop at 196 kHz It is generated by multiplying the pulse attenuation by 1 25 PPM Offset Indicates the relative offset of the crystal oscillator in the HRU 402 from the HLUs crystal oscillator Any value between 100 is adequate HDSL 24 Hour ES The number of one second intervals that contained at least one HDSL CRC err...

Page 35: ...tting the seconds is optional 3 At the Date prompt enter the date mm dd yy by pressing the key The cursor defaults to the New Date field 4 Type to exit the Set Clock menu The system date and time is updated and the Remote Terminal Main Menu is displayed If you input an invalid entry the following messages display followed by the name of field where the invalid entry occurred error The Set Date opt...

Page 36: ...LU connected to the remote unit 3 Type to set the default settings 4 Type exit and return to the previous screen Table 8 lists the System Settings fields and descriptions SYSTEM SETTINGS TIME 12 46 06 DATE 02 02 98 CIRCUIT ID A EQUALIZATION EXT P MARGIN ALARM THRESH 4 B SMART JACK LPBK ENABLED Q RLOS DS1 LOS ALARM ENABLED C SPECIAL LPBK GNLB R ALARM PATTERN AIS F POWER AUTO S BPVT DISABLED G ZBTSI...

Page 37: ... AUTO HIGH or LOW ZBTSI Indicates whether ZBTS is either On or Off An On setting tells the system that the ESF frame is operating in its Zero Byte Time Slot Interface ZBTSI mode An Off setting tells the system that the ESF frame is operating in its normal non ZBTSI mode BER Alarm Thresh BERT Indicates whether the Bit Error Rate threshold is set to either 10 7 10 6 or none Loopback Timeout Indicate...

Page 38: ...atus of DS0 blocked channels and identifies the channels that have been blocked using xx symbols underneath each blocked channel A None setting indicates no channels are blocked A BLK setting indicates some channels are blocked Margin Alarm ALM Threshold THRES Indicates the settings for the margin alarm thresholds Remote DS1 LOS Alarm RDA Indicates whether a LOS Loss of Signal at the HRU DS1 input...

Page 39: ...opback Screen Without Doublers 2 Type to disable loopbacks 3 Type for HLU network loop settings 4 Type for HRU network loop settings 5 Type for HLU customer loop settings 6 Type for HRU customer loop settings 7 Type to exit and return to the previous menu LOOPBACK MENU TIME 00 15 34 DATE 02 02 98 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC C NETWORK LOOP HRU NREM G CUSTOMER LOOP HLU CRE...

Page 40: ...e previous menu Table 9 lists the HRU 402 List 2 Loopback Field Messages and Descriptions LOOPBACK MENU TIME 00 03 33 DATE 02 02 98 CIRCUIT ID A DISABLE LOOPBACKS B NETWORK LOOP HLU NLOC M NETWORK LOOP DOUBLER 4 NDU4 C NETWORK LOOP HRU NREM N CUSTOMER LOOP DOUBLER 4 CDU4 D NETWORK LOOP DOUBLER 1 NDU1 F NETWORK LOOP DOUBLER 2 NDU2 G CUSTOMER LOOP HLU CREM H CUSTOMER LOOP HRU CLOC I CUSTOMER LOOP DO...

Page 41: ...owards network NLOC Network Local Loopback Loopback at HLU local towards network CLOC Customer Local Loopback Loopback at HRU local towards CI CREM Customer Remote Loopback Loopback at HLU remote towards CI NDU1 Network Doubler 1 Loopback Loopback at first doubler towards network CDU 1 Customer Doubler 1 Loopback Loopback at first doubler towards CI NDU2 Network Doubler 2 Loopback Loopback at seco...

Page 42: ...S DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 20 30 000 000 000 000 000 000 000 000 000 000 000 000 20 45 000 000 000 000 000 000 000 000 000 000 000 000 21 00 000 000 000 000 000 000 000 000 000 000 000 000 21 15 000 000 000 000 000 000 000 000 000 000 000 000 21 30 000 000 000 000 000 000 000 000 000 000 000 000 21 45 000 000 000 000 000 000 000 000 000 000 000 000 22 00 000 000 000 000 000 000 00...

Page 43: ...HDU1 HDU2 HDU1 HDU2 08 00 000 000 000 000 000 000 000 000 000 000 000 000 08 15 000 000 000 000 000 000 000 000 000 000 000 000 08 30 000 000 000 000 000 000 000 000 000 000 000 000 08 45 000 000 000 000 000 000 000 000 000 000 000 000 09 00 000 000 000 000 000 000 000 000 000 000 000 000 09 15 000 000 000 000 000 000 000 000 000 000 000 000 09 30 000 000 000 000 000 000 000 000 000 000 000 000 09...

Page 44: ...gure 19 Performance History Screen for Non doubler Applications 2 Type to exit and return to the previous menu 3 Type to view the spans that are currently in use Time 00 16 55 7 DAY HISTORY CIRCUIT ID SPAN 1 ERRORED SECONDS UNAVAILABLE SECONDS DS1 HDSL 1 HDSL 2 HLU HRU HLU HRU HLU HRU 01 26 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 27 00000 00000 00000 00000 00000 ...

Page 45: ...HRU 01 26 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 27 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 28 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 29 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 30 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 01 31 ...

Page 46: ...y typing Figure 21 Alarm History Screen for Non doubler Applications 2 Type to exit the previous menu 3 Type to clear the current values 4 Type to update the screen Table 10 lists the Alarm History fields and descriptions These descriptions apply to the Alarm History for doubler applications as well ALARM HISTORY TIME 00 17 18 DATE 02 02 98 CIRCUIT ID Type First Last Current Count LOS DS1 HLU OK 0...

Page 47: ...0 6 threshold crossing Current condition number of alarm Span1 LOSW HDSL1 First and last instance of LOSW on HDSL1 Current condition number of alarms Span1 LOSW HDSL2 First and last instance of LOSW on HDSL2 Current condition number of alarms Span1 Margin L1 First and last instance of exceeded margin on Loop 1 Current condition number of alarms Span1 Margin L2 First and last instance of exceeded m...

Page 48: ... menu 2 Type to clear the current values 3 Type to update the values 4 Type to view the next span View System Inventory The System Inventory screen allows you to view the model number list number and software versions of all circuit modules The screen also allows units which are to be attached to the circuit modules and a Circuit ID which are assigned to the application to be viewed ALARM HISTORY ...

Page 49: ...ailable NA All detected modules are fully identified Whenever the line unit loses sync with Span 1 the product types are replaced by the NA label until sync is reestablished and each module can in turn be reidentified 1 From the Remote Terminal Main Menu screen type to display the System Inventory screen Figure 23 Inventory Screen 2 Type through to change a circuit ID 3 Type to exit and return to ...

Page 50: ... SLIM one half 400 Dimensions Height 5 6 in 14 22 cm Width 0 7 in 1 7 cm Depth 5 6 in 14 22 cm Weight 1 lb 2 oz Power Line powered consumption 3 1 W When connected to the following line units HLU 231 List 8x HLU 231 List 5x and HLU 388 List 5x 4 5 W When connected to all other line units Local power consumption 5 2 W Sealing current on 4 1 W Sealing current off Maximum provisioning loss 35 dB at 1...

Page 51: ...kbps 2B1Q full duplex Output 13 dB 0 5 dB 135Ω Line impedance 135Ω Line DC resistive signature 14Ω Start up time 15 seconds typical 30 seconds maximum DS1 Line impedance 100Ω Pulse output 0 dB RLEV 0 15 dB RLEV 15 Input level sensitivity 35 dB Line rate 1 544 Mbps 200 bps System output wander looped 0 3 UI 648 ns max Line format AMI B8ZS or ZBTSI Frame format ESF SF or unframed Line Clock Rate Int...

Page 52: ...on 150 402 102 01 Revision 01 44 July 27 1998 HRU 402 List 2 CARD EDGE PINOUT DIAGRAM The HRU 402 List 2 occupies one slot in a remote enclosure The card edge pinout diagram for the remote unit is shown in Figure 24 Figure 24 Card edge Pinouts ...

Page 53: ...nals to which they are connected The HRU 402 List 2 and its associated line units remove this limitation and become BPVT transparent by detecting and counting input BPVTs at each end and then replicating them at the distant end T1 output port In addition the CRCs in each direction of every HDSL loop of each span are also counted and added in with the BPVT count to produce a Total Error Count TEC T...

Page 54: ...o in intervals as short as one second Alarms usually require the full 60 seconds or longer to clear depending on the frequency of the transient errors This BER option is always present in any line unit circuit since it is independent of the versions of the other HiGain modules in the circuit Remote DS1 Alarm RDA Option The Receive Loss of Signal RLOS alarm output at the HLU can be inhibited by dis...

Page 55: ...1 Line Code Auto Option When the DS1 line code option is set to AUTO mode both the HLU and HRU 402 List 2 set their T1 output codes to the codes reserved at the opposite end of the T1 input AUTO mode forces the input and the output codes in each direction of transmission to be identical In the AUTO mode of older HiGain units the DS1 output code was determined by the input code at the local T1 inpu...

Page 56: ...hich comprise one HiGain system A block diagram of the HRU 402 List 2 is shown in Figure 25 The HRU 402 List 2 power supply converts the 90 to 200 Vdc power that is received on the simplex pairs or the 48V input when locally powered to voltages and currents required by the remote unit circuitry The remote unit typically dissipates 2 5W of power The HRU 402 List 2 can be used with the HLU 232 line ...

Page 57: ... of the card edge connector Figure 24 on page 44 To set local or line power for the remote unit switch the local power LPWR switch S1 to ENA see Figure 3 for switch location When LPWR is set to DIS the HRU must be line powered The earlier versions of the HLU 231 Lists 1 2 3 3A and 4 must first have their PWRF user option set to DIS when connected with a locally powered HRU 402 List 2 unit When ena...

Page 58: ...owers up and operates normally if it is within range to support line powering The 48V local power supply must have 110 mA output current capacity 5 2W to power each HRU 402 List 2 A Teltrend WPS 2005 Wall Mount Power Supply 48V and 250 mA is capable of powering two HRU 402 List 2 units The 2005 provides spade lugs to access its 48V output You can reach Teltrend at 1 800 TEL TREN Simplex Sealing Cu...

Page 59: ...uit Ideally personnel performing loopback testing are in direct communication with each other in order to correlate messages displayed at both the HRU and HLU during the test The HRU 402 List 2 supports four types of loopbacks Figure 26 Network Remote NREM The DSX signal is looped back to the DSX at the HRU SmartJack SMJK Loopback at the HRU towards the network initiated by a 2 in 5 in band loopba...

Page 60: ...1111110 HLU HLU HLU HLU CREM 6 in 7 HRU 412 5 IN 7 CLOC HRU 412 HDSL SPAN HLU HLU HLU HRU 412 4 in 7 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 IN 7 CLOC HRU 412 HRU 412 5 in 7 CLOC AIS HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU 1111000 NLOC HRU 412 HDSL SPAN HLU HLU HLU HRU 412 HRU 412 1110000 3 in 7 AIS NREM HRU 412 HRU 412 HRU 412 HRU 412 HDSL SPA...

Page 61: ...ic loopback is required in order to present the all ones pattern to the CPE and at the same time to loop the signal being received from the network back towards the network This puts the HiGain system in its AIS ENA SmartJack loopback state It remains in this state until a loopdown command is detected or the default time out period if enabled expires When the HRU is in its AIS ENA SmartJack metall...

Page 62: ... this signal if the Code option is set to AUTO It indicates AMI or B8ZS if the Code option is set to either AMI or B8ZS respectively All of the HRU loopbacks towards the network NREM and SMJK are metallic logic AIS ENA or metallic only AIS DIS The SMJK and NREM loopbacks are identical They differ only in how they are initiated The SMJK identifying label indicates that the loopback was initiated by...

Page 63: ...American Wire Gauge B8ZS Bidirectional 8 zero Substitution BDG Bridged BER Bit Error Rate BERT BIT Error Rate Threshold BPV Bipolar Violation BPVT Bipolar Violation Transparency CI Customer Interface CO Central Office CLOC Customer Local Loopback CPE Customer Premises Equipment CRC Cyclic Redundancy Check CSA Carrier Service Area CSU Channel Service Unit dB Decibel DCE Data Circuit terminating Equ...

Page 64: ... Frame Data Link FRN Frame HCDS High Capacity Digital Service HDSL High bit rate Digital Subscriber Line HDU HiGain Doubler Unit HLU HiGain Line Unit HRE HiGain Remote Enclosure HRU HiGain Remote Unit I CPE Interface Customer Premises Equipment LBK Loopback LCD Liquid Crystal Display LED Light Emitting Diode LOS Loss of Signal LOSW Loss of Sync Word LPWR Local Power LVL Level NEBS Network Equipmen...

Page 65: ...ne Service RCV Receive RDA Remote DS1 Alarm RLEV Receive Level RLOS Receive Loss of Signal SAIS SmartJack AIS SCURR Sealing Current SF Super Frame S N Signal to Noise SPLB Special Loopback TEC Total Error Count TLOS LB Transmit Loss of Signal Loopback TSEC Total System Error Count TSGR Transport System Generic Requirements UAS Unavailable Seconds UL Underwriters Laboratory W Watts XMT Transmit ZBT...

Page 66: ...irectly by a Customer Service Engineer At other times a request for technical assistance is handled by an on duty Customer Service Engineer through a callback process This process normally results in a callback within 30 minutes of initiating the request In addition PairGain maintains a computer bulletin board system for obtaining current information on PairGain products product troubleshooting ti...

Page 67: ...lation Do not try to repair the unit If it fails replace it with another unit and return the faulty unit to PairGain for repair Any modifications of the unit by anyone other than an authorized PairGain representative voids the warranty If a unit needs repair call PairGain for a Return Material Authorization RMA number and return the defective unit freight prepaid along with a brief description of ...

Page 68: ...rence to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Refer to the installation section of the appropriate instruction manual for the unit you are installing to get information on Cabling Correct connections Grounding MODIFICATIONS The FCC require...

Page 69: ......

Page 70: ...Corporate Office 14402 Franklin Avenue Tustin CA 92780 Tel 714 832 9922 Fax 714 832 9924 For Technical Assistance 800 638 0031 ...

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