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TP48200A-D14A1 Telecom Power
User Manual

5 System Maintenance

Issue 04 (2019-12-20)

System Maintenance

5.1 Routine Maintenance

The TP48200A-D14A1 is maintained every six months. If faults are identified, clear them
immediately.

Table 5-1

Maintenance

Item

Check Whether

Check Method

Repair When

Measures

Electricity

The voltage output
is normal.

Using a multimeter

The BLVD or
LLVD voltage
exceeds the
threshold.

For details, see
section 5.2
Troubleshooting

Preventive
maintenance
inspection (PMI)

Indicators are
normal.

Observing
indicators

Alarms are
generated.

Cabinet appearance

The paint or the
electroplated
coating on the
cabinet are flaking
off or scratches
occur.

Observing the
cabinet

The cabinet surface
is damaged or
distorted.

Repaint and repair
the cabinet.

5.2 Troubleshooting

5.2.1 Troubleshooting Common Faults

Table 5-2

Common faults and troubleshooting methods

Fault Type

Fault Analysis

Handling Method

AC power off



AC input cable fault

Check whether the DC input cable is correctly and

Summary of Contents for TP48200A-D14A1 Telecom Power

Page 1: ...TP48200A D14A1 Telecom Power User Manual Issue 04 Date 2019 12 20 HUAWEI TECHNOLOGIES CO LTD ...

Page 2: ...tomer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subject to c...

Page 3: ...h a high level of risk which if not avoided will result in death or serious injury Indicates a hazard with a medium level of risk which if not avoided could result in death or serious injury Indicates a hazard with a low level of risk which if not avoided could result in minor or moderate injury Indicates a potentially hazardous situation which if not avoided could result in equipment damage data ...

Page 4: ...anges between document issues are cumulative The latest document issue contains all the changes made in earlier issues Issue 04 2019 12 20 Optimized the content about rectifiers Issue 03 2013 07 25 Modified the LCD menu Issue 02 2012 12 09 Port description is modified Issue 01 2012 03 01 This issue is the first official release ...

Page 5: ...ion 15 2 2 Typical Networking 15 2 3 Features 16 2 4 Configuration 16 2 5 Working Principles 17 3 Component Description 19 3 1 Cabinet 19 3 2 Temperature Control System 20 3 2 1 Overview 20 3 2 2 Direct Cooling Unit 20 3 2 3 Fan Assembly 21 3 3 Rectifier 22 3 4 Power Distribution Unit 23 3 5 Monitoring Unit 24 3 6 Storage Battery Optional 25 4 Installation and Commissioning 26 5 System Maintenance...

Page 6: ... 20 Copyright Huawei Technologies Co Ltd v 6 Monitoring Function 37 6 1 PMU Panel 37 6 1 1 PMU02C1 37 6 1 2 UIM02A 40 6 2 LCD UI Operation 43 6 3 Web UI Operation 46 6 3 1 Query History Log 53 A Technical Specifications 55 B LCD Menu 58 C Acronyms and Abbreviations 62 ...

Page 7: ...ge are not covered under the warranty Follow local laws and regulations when installing operating or maintaining the equipment The safety instructions in this document are only supplements to local laws and regulations Huawei will not be liable for any consequences of the following circumstances Operation beyond the conditions specified in this document Installation or use in environments which ar...

Page 8: ...gure Follow the specified procedures for installation operation and maintenance Ensure that bolts are tightened with a torque wrench and marked using red or blue color Installation personnel mark tightened bolts in blue Quality inspection personnel confirm if the bolts are tightened and then mark them in red The marks should cross the edges of the bolts as shown in the following figure Before inst...

Page 9: ...the case of a fire immediately leave the building or the equipment area and turn on the fire alarm bell or make an emergency call Do not enter the building on fire in any case Do not stop using protective devices Pay attention to the warnings cautions and related precautionary measures in this document and on the equipment Promptly replace warning labels that have worn out Keep irrelevant people a...

Page 10: ...tial bonding This symbol is found with equipotential terminals inside equipment Indicates electrostatic discharge ESD This symbol is used in all electrostatic sensitive areas Before operating equipment in these areas wear ESD gloves or an ESD wrist strap Indicates that the equipment is safe to use at altitudes below 2000 m 6561 6 ft Indicates that the equipment is not safe to use in tropical clima...

Page 11: ...nals personnel who are trained or experienced in equipment operations and are clear of the sources and degree of various potential hazards in equipment installation operation and maintenance Trained personnel personnel who are technically trained have required experience are aware of possible hazards on themselves in certain operations and are able to take protective measures to minimize the hazar...

Page 12: ...wer supply ensure that cable connections are correct If the equipment has multiple inputs disconnect all the inputs before operating the equipment Cabling When routing cables ensure that a distance of at least 30 mm exists between the cables and heat generating components or areas This prevents damage to the insulation layer of the cables Do not route cables behind the air intake and exhaust vents...

Page 13: ...secured and will not tilt or fall down due to loss of balance which can cause personal injury or equipment damage Do not expose the equipment to flammable or explosive gas or smoke Do not perform any operation on the equipment in such environments Installation at Heights Working at heights refers to operations that are performed at least 2 meters above the ground Do not at heights in any of the fo...

Page 14: ...eople to stay or pass under the area involving working at heights Inspect the scaffolding springboards and workbenches used for working at heights in advance to ensure that their structures are solid and not overloaded Dismantle the scaffolding from top down after finishing the job Do not dismantle the upper and lower layers at the same time When removing a part ensure that other parts will not co...

Page 15: ...pes are secured and the ladder is held firm Before using a ladder check that it is intact and confirm its load bearing capacity Do not overload it Ensure that the wider end of the ladder is at the bottom or protective measures have been taken at the bottom to prevent the ladder from sliding Ensure that the ladder is securely positioned The recommended angle for a ladder against the floor is 75 deg...

Page 16: ... drilling holes into a wall or floor observe the following safety precautions Do not drill holes into the equipment Doing so may affect the electromagnetic shielding of the equipment and damage components or cables inside Metal shavings from drilling may short circuit boards inside the equipment Wear goggles and protective gloves when drilling holes When drilling holes protect the equipment from s...

Page 17: ...tteries for example insert sundries into batteries or immerse batteries in water or other liquids When replacing a battery use a battery of the same model or type Improper replacement may cause the battery to explode Do not connect a metal conductor to the battery poles or touch the battery terminals Otherwise the battery may be short circuited and heat up which can cause injuries such as burning ...

Page 18: ...e the polarities when installing batteries Do not short circuit the positive and negative poles of the same battery or battery string Otherwise the battery may be short circuited When installing a battery string retain at least one breakpoint to prevent a loop being formed After checking that the installation is correct close the breakpoints to finish the installation During the installation insul...

Page 19: ...hose electrolyte leaks note that the leaking electrolyte may hurt human bodies If the electrolyte overflows follow the instructions of the battery manufacturer or neutralize the electrolyte by using sodium bicarbonate NaHCO3 or sodium carbonate Na2CO3 Lithium Battery The safety precautions for lithium batteries are similar to those for lead acid batteries except that you also need to note the prec...

Page 20: ...200A D14A1 Telecom Power User Manual 1 Safety Precautions Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 14 When maintenance is complete return the waste lithium battery to the maintenance office ...

Page 21: ... telecom equipments The TP48200A D14A1 uses 50 A rectifiers and outputs a maximum of 200 A current Figure 2 1 shows the TP48200A D14A1 designation explanation Figure 2 1 Designation explanation 2 2 Typical Networking The TP48200A D14A1 power system AC power supply ATS storage batteries and related devices constitute the site power solution Figure 2 2 shows the application of the TP48200A D14A1 pow...

Page 22: ...more rectifiers to enter the sleep mode Wide Range of AC Input Voltage The AC input voltage of the system ranges from 90 V AC to 290 V AC phase voltage Highly Level Safety Design The power system complies with the CE standard the power distribution components comply with the CE and 3C standards and the rectifier complies with the UL CE and TUV standards 2 4 Configuration The TP48200A D14A1 power s...

Page 23: ...of rectifiers 5 Space for customer 6 Space for battery 2 5 Working Principles Working principles are described as follows The rectifier converts AC power into 48 V DC power The direct currents DCs generated by rectifiers converge on a busbar and then divide into multiple routes to power loads The monitoring unit monitors operating parameters in real time analyzes the operating status and generates...

Page 24: ...TP48200A D14A1 Telecom Power User Manual 2 Overview Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 18 Figure 2 4 Conceptual diagram ...

Page 25: ...r User Manual 3 Component Description Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 19 3 Component Description 3 1 Cabinet Figure 3 1 shows the cabinet and Table A 1 shows the detailed specification Figure 3 1 Cabinet ...

Page 26: ...ol system Item Specifications Operating temperature 40 C to 50 C include 1120W M2 sun radiation Cooling capacity Rated power 1500W Maximum power 1700 W Acoustic noise ETS 300 753 Class 4 1 rural environment 3 2 2 Direct Cooling Unit The direct cooling unit consists of an air exhaust device an air intake device an air filter and a fan assembly The direct cooling unit extends the area for exchanging...

Page 27: ...Air exhaust device and air intake device 3 2 3 Fan Assembly The fan assembly houses two centrifugal fans The fans direct air into the cabinet through the lower part of the door and out of the cabinet through the upper Figure 3 4 shows the fan assembly Figure 3 5 shows a centrifugal fan Figure 3 4 Fan assembly Figure 3 5 Centrifugal fan ...

Page 28: ... power 34 W 3 3 Rectifier Appearance The rectifier converts the AC input power into stable 48 V DC power Figure 3 6 shows the rectifier Figure 3 6 Rectifier appearance Panel The rectifier panel provides the run indicator alarm indicator and fault indicator Figure 3 7 shows the rectifier panel Table 3 3 shows the indicator description Figure 3 7 Rectifier panel 1 Run indicator 2 Protection indicato...

Page 29: ...ectifier hibernates AC input undervoltage or overvoltage occurs Fault indicator Red Steady on Output overvoltage occurs Remove the rectifier and then install it again If there is still no output replace the rectifier The fan is faulty Replace the rectifier Overtemperature occurs Ensure that the vent is unblocked and that the ambient temperature is within the specified range No output exists becaus...

Page 30: ... can be installed in a 19 inch rack Figure 3 9 shows the monitoring unit Figure 3 9 Monitoring unit PMU02C1 The PMU provides a RUN LED green an ALM LED red an embedded buzzer and a liquid crystal display LCD that displays the operating parameters operating status alarm status configured parameters and controlling parameters of the DC power AC power PSUs and storage batteries These parameters are c...

Page 31: ...20 Copyright Huawei Technologies Co Ltd 25 Figure 3 10 Network diagram 3 6 Storage Battery Optional Storage batteries store electrical energy and supply power to the loads when the power supply of the D G and mains is insufficient TP48200A D14A1 supports 1 group 100Ah VRLA batteries ...

Page 32: ... Power User Manual 4 Installation and Commissioning Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 26 4 Installation and Commissioning The detailed installation refers to the TP48200A D14A1 Quick Installation Guide ...

Page 33: ... voltage exceeds the threshold For details see section 5 2 Troubleshooting Preventive maintenance inspection PMI Indicators are normal Observing indicators Alarms are generated Cabinet appearance The paint or the electroplated coating on the cabinet are flaking off or scratches occur Observing the cabinet The cabinet surface is damaged or distorted Repaint and repair the cabinet 5 2 Troubleshootin...

Page 34: ...he DC overvoltage and undervoltage If the thresholds are not proper reset the thresholds according to the actual conditions 2 When the storage battery is powering the load remove all the PSUs and then insert each PSU one by one If an overvoltage alarm is generated after a PSU is inserted the voltage of the PSU exceeds the upper threshold Then replace the PSU Charging overcurrent Communication fail...

Page 35: ...alarm parameters Overtemperature or undertemperature in the shelter with the temperature sensor Temperature sensor fault 1 Check whether PMU temperature alarm thresholds are set according to local conditions If the thresholds are not proper set the thresholds accordingly 2 Check whether the temperature control device in the shelter is faulty If the temperature control device is faulty repair it Th...

Page 36: ... the shelter If there is fire extinguish the fire and ventilate the shelter 2 If the alarm persists when there is no smoke check whether the smoke sensor is faulty Rectifier fault Poor contact of the rectifier module Rectifier module fault 1 Check whether the ALM indicator on the panel of the rectifier module steady on If the ALM indicator steady on it indicates that the rectifier module is faulty...

Page 37: ...place the PMU DC surge protector fault DC surge protector fault 1 Check whether the fault detection cables of the DC surge protector are correctly and securely connected If the cables are not correctly and securely connected reconnect them 2 If the cables are correctly connected replace the DC surge protector If you rectify the corresponding faults the alarms in the PMU are automatically cleared a...

Page 38: ...n in Figure 5 1 When there is voltage at control poles 1 and 2 but measuring shows that the input and output poles 3 and 4 are connected it indicates that the contactor is faulty Battery Fuse or battery circuit breaker Branch Open type when the contactor without electricity the state is open When there is no voltage at the control poles of the contactor check whether the input and output poles of ...

Page 39: ...he PMU fails to monitor or control AC or DC distribution when AC DC power is distributed normally and communications cables are connected properly Parameters cannot be set or operating information cannot be viewed on the PMU 5 3 Component Replacement Describe how to replace the main components of the power system Load disconnection is prohibited when you replace the main components Take measures t...

Page 40: ...d Replacing the PMU To replace the PMU perform the following steps Step 1 Loosen the screws on the PMU panel using a Phillips screwdriver Step 2 Pull the PMU outwards Step 3 Insert the new PMU Step 4 Tighten the screws on the handle Step 5 Set the parameters of the new PMU End Replacing the AC SPD To replace the AC SPD perform the following steps Step 1 Remove the faulty SPD Step 2 Insert the new ...

Page 41: ... then wrap the cables or copper bars using black PVC insulation tape to avoid hazards Step 3 Press the contact plate at the bottom of the circuit breaker using a flat head screwdriver Then remove the circuit breaker as shown in Figure 5 5 Step 4 Press the contact plate at the bottom of the circuit breaker using a flat head screwdriver again to install the new circuit breaker in the correct positio...

Page 42: ...TP48200A D14A1 Telecom Power User Manual 5 System Maintenance Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 36 Figure 5 6 Installing the circuit breaker End ...

Page 43: ... shows the front panel of the monitoring module Figure 6 1 Front panel of the monitoring module 1 Reserved unit 2 PMU02C1 3 UIM02A 6 1 1 PMU02C1 All ports in this manual are protected by a security mechanism The PMU02C1 is a component of the monitoring module Figure 6 2 shows the front panel of the PMU02C1 Figure 6 2 Front panel of the PMU02C1 1 RUN LED 2 ALM LED 3 LCD ...

Page 44: ...arm is generated Off No critical alarm is generated The RUN LED is valid only when the COM port is used in communication over RS485 or RS232 LCD The information displayed on the LCD of the PMU02C1 can be set and queried in real time You can query and set parameters by using the four buttons on the front panel Buttons Table 6 2 describes buttons on the front panel of the PMU02C1 Table 6 2 Button de...

Page 45: ...g and Enter simultaneously Ports Table 6 3 describes the ports on the front panel of the PMU02C1 Table 6 3 Ports on the front panel of the PMU02C1 Port Communication Mode Rate Communication Protocol COM FE Fast Ethernet 10 100Mbit s Auto negotiation TCP IP SNMP or HTTPS RS485 RS232 RS485 RS232 9600 19200 bit s Master slave protocol Notes The communication modes RS485 and RS232 are mutually exclusi...

Page 46: ...232 port Table 6 5 Pin description Pin Signal Meaning 1 TX Transmit data 2 TX 4 RX Receive data 5 RX 3 RX232 Receive data 7 TX232 Transmit data 6 PGND Protection ground 6 1 2 UIM02A The UIM02A provides sensor ports Boolean value input ports dry contact output ports Figure 6 4 shows the front panel of the UIM02A Figure 6 4 UIM02A panel Table 6 6 Port descriptions Port Type Silk Screen Description S...

Page 47: ...for inputting Boolean value 6 DIN7 Used for inputting Boolean value 7 Dry contact output port ALM1 Used for reporting smoke alarms ALM2 Used for reporting door broken alarms ALM3 Used for reporting rectifier faults and rectifier communication faults ALM4 Used for reporting load fuse blown alarms and battery fuse blown alarms and battery stolen alarms ALM5 Used for reporting battery temperature ala...

Page 48: ...Ltd 42 Table 6 7 Pin definition Silk Screen Pin Pin definition WATER 1 12 V 2 WATER 3 GND 4 NULL PELU 1 5 V 2 SCL 3 SDA 4 PGND TEMHUM 1 24 V 2 VTEM 3 24 V 4 VHUM AIN 1 SIM1 2 SIM2 DIN1 1 JTD1 2 12 V DIN2 1 JTD2 2 12 V DIN3 1 JTD3 2 12 V DIN4 1 JTD4 2 12 V SMOKE 1 SMOKE 2 24 V GATE 1 GATE 2 12 V TEM BAT 1 24 V 2 VBTEM ...

Page 49: ...g module View the status of the system Set parameters including system parameters load parameters environment parameters battery parameters and TCU parameters View current alarms and historical alarms Modify network parameters such as the IP address and system date and time Querying Alarms Figure 6 5 depicts how to query alarms on the LCD For the descriptions of buttons see Table 6 2 Figure 6 5 Qu...

Page 50: ...word protected Intelligent Hibernation The rectifier efficiency is small when the load power is low When the total load power is low certain rectifiers can be hibernated to improve the load power of running rectifiers and increase the rectifier efficiency This saves energy Rectifiers should be hibernated in turn to ensure the same aging degree When the started rectifier with the longest running ti...

Page 51: ...Parameter Description Default Value Range Sleep Enable Before enabling the periodic battery test you need to set this parameter to Yes No YES or NO Best Effi Point The optimal efficiency of one rectifier 70 60 80 Exch Cycle Interval between hibernation operations 7 days 5 30 days Min Num Rect On Minimum number of running rectifiers under the no load condition 1 pcs 1 3 LCD Menu Hierarchy Figure 6 ...

Page 52: ...ons on the Web UI Query the status of the system Set parameters including system parameters load parameters environment parameters battery parameters and TCU parameters Query current alarms and historical alarms Query system logs Modify network parameters such as the IP address and system date and time Set the EMS addresses and port for receiving Trap messages Import configuration files and upgrad...

Page 53: ...n in Figure 6 8 enter the user name and password The preset user name is admin and preset password is 00200 Figure 6 8 Login page Query System Status On the System Status page you can view the system status including the system information active alarms battery status and module status See Figure 6 9 Figure 6 9 System Status Configure System Parameters Perform the following steps Step 1 Set relate...

Page 54: ...You can configure a PMU02C1 by importing the txt file saved in drive C You are not recommended to change the file because the import will fail if the file name is changed The procedure is as follows Step 1 On the System Configure page click Import from file The Choose files page is displayed Step 2 Select the txt file and then click Open toimport the parameter settings Step 3 Click Submit after pa...

Page 55: ...gure 6 11 Figure 6 11 TCU Configure Parameter Configure Digital Parameters On the Digital Configure page set alarm names and severity to match the actual alarm names and spare digitals Then click Submit Figure 6 12 Digital Configure Configure Network Parameters In the navigation area double click Network Configure to set network configuration parameters See Figure 6 13 ...

Page 56: ...f there is no NTP server set System Time and System Date Then click Submit Step 1 Setting the System IP Address Set System IP Netmask and Gateway and then click Submit Step 2 Setting SNMP Parameters On the PMU page set SNMP parameters and then click Submit Step 3 Setting EMS Trap Parameters On the SNMP Trap page set the EMS addresses and port for receiving Trap messages You can set a maximum ofsix...

Page 57: ...1 Control As shown in Figure 6 14 Figure 6 14 Control User Management On the User Management page you can create and delete users and set the user group of users See Figure 6 15 Figure 6 15 User Management If you click New the Add User page is displayed If you click Modify the Modify User page is displayed See Figure 6 16 ...

Page 58: ...le perform the following steps Step 1 Before upgrade obtain the name size and save path of the upgrade file Step 2 On the Upgrade page click Browse and then select the hex file Step 3 Click Send End You can learn about the upgrade result in the following ways View the message displayed during the upgrade View the records in the log history Check whether the version of Power Manufacturer is the tar...

Page 59: ...y Alarm The Alarm History pagedisplays the information about historical alarms as shown in Figure 6 18 Clicking export will overwrite the alarms exported previously Clicking Clean will delete historical alarms for good Figure 6 18 Alarm History 6 3 1 Query History Log The Log History pagedisplays the information about historical logs shown in Figure 6 19 ...

Page 60: ... User Manual 6 Monitoring Function Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 54 Clicking export will overwrite the logs exported previously Clicking Clean will delete historical logs for good Figure 6 19 Log History ...

Page 61: ...tude 0 4000 m 0 13123 2 ft When the altitude ranges from 3000 m 9842 4 ft to 4000 m 13123 2 ft the operating temperature is derated by 1º C 1 8º F for each additional 100 m 328 08 ft AC input Input mode Single phase three wire L N and PE Input voltage 90 290 V AC rated voltage 220 V AC Input frequency 40 65 Hz rated frequency 50 60 Hz Power factor 0 99 rated load DC output Output voltage range 42 ...

Page 62: ...ion DC output overvoltage protection threshold 58 5 60 5 V DC EMC CE CISPR 22 class A AC terminal DC terminal and Signal terminal RE CISPR 22 Class A Harmonic IEC 61000 3 2 Fluctuation and blinking IEC 61000 3 3 ESD Standard IEC61000 4 2 Contact discharge voltage 6kV Class B air discharge voltage 8 kV Class B EFT The voltage at signal ports is 0 5 kV Class B The voltage at the DC power ports is 2 ...

Page 63: ...7 56 in Weight 200 kg without storage batteries and rectifiers Space for customer More than 10U Protection level Equipment compartment is IP55 Battery compartment is IP23 Installation and carrying Mounted on concrete pad and carried by using a hoist Maintenance From the front supporting module level replacement Cabling Bottom inlet and bottom outlet Heat dissipation mode Direct ventilation Heat di...

Page 64: ...nd Menu Third Menu Forth Menu Fifth Menu Default Value Alarm Status Active Alarm Critical ALM Major Alarm History Alarm History CLR Alarm Time Bat Test Result Rect Info ID Voltage Current Current Limit Status Output Power Rated Efficiency Input Power Input Current Rated Current Inner Temp Version Info TCU Info Fan Rev Outlet Vent Intake Vent TCU Inner Temp ...

Page 65: ...ity1 400AH Capacity2 0AH Install Date 2001 01 01 Maintenance Date Jan 01 01 Warranty Date Jan 01 01 Batt Off Para BLVD Enable Yes BLVD 43 0 V BHTD Enable No BHTD 53 C Charge Para FC Volt 53 5 V BC Volt 56 5 V Curr Limit 0 10 C10 Temp Comp 80 mV C Batt Test Para Auto Test Auto Test Enable Disch Test Cycle 120days Test End Voltage 1 9 V Duration 10hours Test Delay 14days Short Test Test End Voltage ...

Page 66: ...or Enable No Sensor Para Batt Temp High 50 C Batt Temp Low 0 C Amb Temp High 50 C Amb Temp Low 0 C Humidity High 80 Humidity Low 10 TCU Settings TCU In slot Yes TCU Temp High 68 C TCU Temp Low 20 C Alarm Settings Alarm Severity Alarm Level Digital Alarm Digital No Mode Relate Relay Alarm Relate Relay Default Type Rect Settings Sleep Enable No Best Effi Point 70 Exch Cycle 7days Min Num Rect On 1pc...

Page 67: ... 0 05C10 Night Start Time 22 00 Night End Time 08 00 System Settings Text English Disp Contrast 3 Date Jan 01 01 Time 01 01 Engineering Settings Modify PWD User Init Dara No System Type TP48200A Version Info V200R001C02B 012SP13 Maintenance PMU Reset No CLR History ALM No Batt Test Start Std Test Start BC FC Float Charge Rect1 ON Rect N 1 ALM No The LCD menu varies based on configurations Table 6 ...

Page 68: ...ransfer switch ACDB alternating current distribution box B BLVD battery low voltage disconnection E EMC electromagnetic compatibility EMI electromagnetic interference EMS element management system electromagnetic susceptibility L LLVD load low voltage disconnection I IEC International Electrotechnical Commission M MTBF mean time between failures O OPEX operational expenditure ...

Page 69: ...nd Abbreviations Issue 04 2019 12 20 Copyright Huawei Technologies Co Ltd 63 P PSU power supply unit PMU power monitor unit R RoHS restriction of the use of certain hazardous substances S SNMP Simple Network Management Protocol SPD surge protection device ...

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