omb121430 mbts gsm v100r004 field maintenance issue1.00

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

MBTS GSM Field Maintenance


References

BTS3900 Hardware Description

BTS3900 GSM Site Maintenance Terminal User Guide


Objectives

Upon completion of this course, you will be able to:

Grasp the hardware structure of MBTS

Get a good grasp of the BTS maintenance

Maintain site on local terminal

Execute the tasks of field maintenance


Contents

1. Checking hardware

1. LEDs

2. Cable connections

2. Site local maintenance

3. Replacing boards

4. Routine maintenance list


BTS3900(A) System Overview

Page6

BTS3900BTS3900 BTS3900ABTS3900A

Indoor macro cabinet

Indoor BTSBTS 3900

Outdoor BTSBTS 3900A

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page7

DBS3900 System Overview

DBS3900 components:

BBU3900

RRU3908, RRU3804, RRU3008

MBSC

Power cable

Power cableTrunk cable

CPRI cable

RRU3908

BBU3900

Grounding cable

Antenna

TMA

Feeder

RF jumper

Grounding cable

RF jumper


Boards and Modules in BBU

BSBC: The universal BBU Subrack Backplane type C

GTMU: The GSM Transmission, Timing and Management

Unit

UBFA: The Universal BBU Fan unit type A

UPEU: The Universal Power and Environment interface

Unit

UELP: The Universal E1/T1 Lightning Protection unit

UEIU: The Universal Environment Interface Unit

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page9Page9

GTMU

The GSM Transmission & Timing & Management Unit

for BBU (GTMU) is the basic transmission and control

function entity of the BBU. It provides the reference

clock, maintenance port, and external alarm

collection port, monitors the power supply, and

controls and manages the entire base station.

Figure 1 GTMU panel

Figure 2 GTMUb panel


GTMU (Cont.)

Port

Connec

tor

Type

Description

CPRI0 to CPRI5

SFPPorts for the communication between the BBU and the RF module; support input and output of the optical and electrical signal.

EXT (GTMUb)

SFP Obligate

ETH RJ45 Port for local maintenance and commissioning.

FE0 RJ45

Connects the BBU to a routing device in the equipment room through the

Ethernet cable to transmit network information.

FE1 DLC

Connects the BBU to a routing device in the equipment room through the

optical cable to transmit network information.

USB USB Enables the automatic software upgrade from a USB disk.

TST USB Provides a reference clock for the tester.

E1/T1DB26 female

Provides four E1/T1 inputs and outputs between the GTMU and the UELP or BSC


UBFA The universal BBU fan unit type A (2U) (UBFA) works with the air inlet box

of the cabinet to form a ventilation circuit, thus cooling the entire cabinet

The UBFA module communicates with the GTMU to regulate the

temperature, adjust the fan speed, and report alarms. The UBFA module

is hot swappable

Label Color Status Description

STATERed/Green

0.125s ON, 0.125s OFF (Green)

The module is not registered, and no alarm is reported.

1s ON, 1s OFF (Green)

The module is running properly.

1s ON, 1s OFF (Red)

The module is reporting alarms.

OFFThe module is powered off or the program is not loaded.


UPEU The universal power and environment interface unit (UPEU)

supports the -48V /-24V DC power input, supplies power to the

boards, modules, and fan in the BBU, and provides access to

multiple environment monitoring signals

Port Type Description

MON0

RJ45Transmitting two RS485 environment monitoring signals

MON1

RJ45Transmitting two RS485 environment monitoring signals

EXT-ALM0

RJ45Transmitting four dry contact alarms

EXT-ALM1

RJ45Transmitting four dry contact alarms

PWR 3V3 +24 V/-48 V DC power input


UEIU UEIU is the environment interface board of BBU, it can support

multi-route monitoring signal input

UEIU is optional and is only used when more ports are needed

LabelConnector

TypeDescription

MON0 RJ45One RS485 signal

MON1 RJ45One RS485 signal

EXT-ALM0

RJ45Four dry contact signals

EXT-ALM1

RJ45Four dry contact signals


Features and Functions of Fan Box

The FAN unit, also called the fan box module, dissipates the heat in the cabinet. One FAN unit has four independent fans.

Detects the temperature

Communicates with BBU unit to report alarms and the adjusted rotation speed of the fans to BBU


Monitoring System for the BTS3900 Cabinet (-48 V DC)


Monitoring System for the BTS3900 Cabinet (+24 V DC)


Monitoring System for the BTS3900 Cabinet (AC)


Main Functions of PMU(AC/DC) The Power and Environment Monitoring Unit (PMU)

provides a comprehensive function of power supply management, power distribution check, and alarm reporting.

Communicates with the GTMU through the RS232/RS422 serial port

Manages the power system and the battery charging and

discharging

Detects and reports monitoring signals

1. LEDs2. Power supply test ports 3. RS232/RS422 ports 4. Battery control switch 5. COM port


Main Functions of PSU(AC/DC) Converting 220 V AC power to -48 V DC power and supplying -

48 V DC power to the DCDU

Monitoring alarms related to module faults (such as output

overvoltage, no output, and fan faults), alarms related to

module protection (such as over temperature protection and

input overvoltage/undervoltage protection), and module out-of-

position alarm

1 Power running LED 2 Protection LED 3 Fault LED

123


Main Functions of DCDU Receiving -48 V DC power input

Distributing the -48 V DC power of 10 outputs for boards and modules in the cabinet

Providing surge protection of 10 kA in differential mode and 15 kA in common mode and providing dry contact for surge protection failure


Ports on the GRFUPort Label Function

RF

ANT_RXBRF RX port, connecting to the antenna

system.

ANT_TX/

RXA

RF TX/RX port, connecting to the

antenna system.

CPRI

CPRI0Connecting the BBU or the upper-level

cascaded GRFU.

CPRI1Connecting the BBU or the lower-level

cascaded GRFU.

Inter-

GRFU

RF signal

RX_INB Input port for diversity receive.

RX_OUTAOutput port for main receive.

Power

supplyPWR

Introducing power input.

Monitoring MON Monitoring and maintaining port.


MRFU PortsPort Type Label

Connector Type

Description

Port fortransceivingRF signals

ANT_RXBDIN connector Connecting to the

antenna subsystem.ANT_TX/RXA

CPRI

CPRI0SFP female connector

Connecting to the BBU, or the upper-level RFU during the cascading.

CPRI1Connecting to the lower-level RFU during the cascading.

Interconnection port for RFReceive signals

RX_INBQMA femaleconnector

Input port of diversity signals in theantenna channel.

RX_OUTAOutput port of diversity signals in theantenna channel.

Power supply port

PWR3V3 power connector

Feeding power.

Monitoring port

MONRJ45 connector

RS485 Monitoring 、 debugging port.


MRFU LED

Label

Status Description

RUN

ONThe power input is normal, but the module is faulty.

OFFThere is no power input, or the module is faulty.

ON for 1s and OFF for 1s

The module is running properly.

ON for 0.125s and OFF for 0.125s

The module is loading software or is not started.

ALMON The module is in the alarm status.

OFF No alarm is generated.

ACT

ONThe module is functional and is connected to the BBU.

OFFThe module is not connected to the BBU.

ON for 1s and OFF for 1s

The module is in the local test status.


MRFU LED

VSWROFF (red) No VSWR alarm is generated.

ON (red) A VSWR alarm is generated.

CPRI0

ON (green) The CPRI link is normal.

ON (red)The interface module fails to receive signals.

ON for 1s and OFF for 1s (red)

The CPRI link is out of lock.

CPRI1

ON (green) The CPRI link is normal.

ON (red)The interface module fails to receive signals.

ON for 1s and OFF for 1s (red)

The CPRI link is out of lock.

Label Status Description


RRU Module The RRU module has a

bottom panel, a cabling

cavity panel, and an area

attached with LEDs.

Provides - 48VDC power

supply.

1 Bottom panel

2 Cabling cavity

panel

3 LEDs


RRU PortsItem Label Description

Bottom panel

RX_IN/OUT Interconnection ports for RF signals

RET RET antenna port

ANT_TX/RXA RF TX/RX port A

ANT_TX/RXB RF TX/RX port B

Cabling cavity panel

RTN+Power wire post

NEG-

TX RX CPRI_E

Eastern optical port

TX RX CPRI_W

Western optical port

EXT_ALM Alarm Port

RST Hardware reset button

TST VSWR Test button for VSWR alarms

TST CPRI Test button for the CPRI port


RRU LEDsLED Color Status Description

RUNGreen

ON The RRU is faulty.

OFF No power input is available.

1s ON,1s OFF The RRU runs properly.

ON for 0.25sOFF for 0.25s

The software is being loaded.

ALM Red

ON or Blinking (1s ON, 1s OFF)

The RRU is faulty and reporting alarms.

OFF No alarm is generated.

ACTGreen

ON The RRU runs properly.

OFF The connection to the BBU is not established.

VSWR TX_ACT

Red

OFF No VSWR alarm is generated.

1s ON1s OFF

A VSWR alarm is generated on the ANT_TX/RXB port.

ONA VSWR alarm is generated on the ANT_TX/RXA port.

0.125s ON0.125s OFF

A VSWR alarm is generated on the ANT_TX/RXA and ANT_TX/RXB ports.


RRU LEDs

CPRI_W (westward CPRI LED)

Red or green

Green The CPRI link is functional.

RedThe reception of the optical module is abnormal and an alarm is generated.

Blinking red 0.25s ON, 0.25s OFF

The CPRI link has a loss-of-lock error.

OFFThe SFP module is not in position or the optical module is powered off.

CPRI_E (eastward CPRI LED)

Red or green

Green The CPRI link is functional.

RedThe reception of the optical module is abnormal and an alarm is generated.

Blinking red 0.25s ON, 0.25s OFF

The CPRI link has a loss-of-lock error.

OFFThe SFP module is not in position or the optical module is powered off.


Transmission E1/T1 Cable Connection

If... Then...

The co-transmission mode is used

Link the DB26 male connector of the E1/T1 cable to the port labeled E1/T1 on the GTMU, and then tighten the screws, as shown in Figure 1.

The separate transmission mode is used

Link the DB26 male connectors of two E1/T1 cables to the ports labeled E1/T1 on the GTMU and on the WMPT respectively, as shown in Figure 2.

Figure 1 Figure 2


Transmission FE/GE Cable Connection

If... Then...

The separate transmission mode is used

Connect one FE/GE cable to the port labeled FE0 on the WMPT/LMPT and another FE/GE cable to the port labeled FE0 on the GTMU.


If... Then...

The co-transmission mode over the electrical port is used

Connect the FE/GE cable to the port labeled FE0 on the WMPT/LMPT. Connect the two ends of the interconnection cable between the FE optical ports to the ports labeled FE1 on the GTMU and on the WMPT/LMPT respectively.



If... Then...

The co-transmission mode over the optical port is used

Connect the FE/GE optical cable to the port labeled FE1 on the WMPT/LMPT. Connect the two ends of the interconnection cable between the FE electrical ports to the ports labeled FE0 on the GTMU and on the WMPT/LMPT respectivelyNOTE: The FE/GE optical cable should be wrapped a winding pipe,



CPRI Cable Connections

Star topology Chain topology

GSM only



GSM + LTE

Dual-star topology over CPRI ports

CPRI cable connections in co-cabinet mode



CPRI cable connections in a co-cabinet base station with WRFUs and DRFUs/GRFUs

Dual-star topology over CPRI ports

GSM + UMTS


CPRI Cable ConnectionsGSM + UMTS + LTE

CPRI cable connections for a base station configured with six GSM+UMTS RFUs, three UMTS only RFUs, and three LTE only RFUs

Example: GU + LO


RF Cable Connections

Single Cabinet Stacked cabinet


Power Cable Connection

-48 V DC power


Contents



3. Replacing boards



Local Maintenance

Connect the maintenance terminal computer with the ETH

port on TMU by crossed cable.


Start the Local Terminal System


Login Site Maintenance Terminal


Site Maintenance Terminal

Navigation PaneView Pane

Status Pane


Obtain the Site Management right


Managing Sites Testing Transport Performance: This

function is performed to check whether the transmission link is normal through an E1 loopback test and a timeslot loopback test.

Querying Alarm Delay Time: This function is performed to query the alarm delay time of boards.

Testing the RF Specifications: This describes how to test the RF specifications. The specifications of the receiver involve the receiver sensitivity, GSM static L1 (first level) function, and the block test. The specifications of the transmitter involve modulation spectrum, handover spectrum, modulation accuracy, and spurious emission.


Load Software

load software to the main control board.


Activate Software Validate the board software loaded onto the main control board.

The board software consists of the main control board software

and other board software.


Manage Sites Querying the Ring Topology Parameters:

This function is performed to query the ring topology parameters, including the working direction of a site in the ring topology (Port 0 is forward link and port 1 is reverse link) and the indication of auto rotate in the ring topology. If automatic rotation is permitted, the result also involves the waiting time before rotation and the scheduled time for attempts before rotation.

Managing the Site Board Parameters: This function is performed to view the parameters associated with the boards configured in a site.

Testing the E1 BER: You can get the information about the link transmission quality of the E1 port in real time by monitoring the E1 BER.


Manage Cells The cell management involves

managing cell attributes and

cell extended attributes,

testing all the BTs and RCs of

a cell so that they can be

locked or unlocked, and

checking whether the BTs and

RCs are functional.


Change the Cell Management State Lock or Unlock the BTs and RCs of a cell.


Manage BTs The BT management involves

locking or unlocking a BT,

resetting a BT, performing the RC

self-test, view the status of the

channels on a specified BT, and

enabling a specified RC to

transmit signals at a predefined

power level.


Change the BT Management State Lock or Unlock a BT.


View the Channel Status

Query the status of all the channels on a BT.


Managing Channels The channel management

involves viewing and setting

channel attributes, locking or

unlocking a channel, and

checking the quality of a

channel by testing the

parameters such as the bit error

ratio (BER) and transmit power.


Managing RCs

The RC management

involves setting the

attributes and extended

attributes of an RC, locking

or unlocking an RC,

resetting an RC, and

adjusting power of an RC

automatically.


Board Management


Querying Board Information query the board running state, software version,

board alarm count, current clock state, board in-

position information, and clock master/backup state.


Reset a board

initialize the parameters associated with a board


Test a Board

check whether the hardware of the board is damaged


Query Port Attributes

query the availability status, management status,

active/standby status, and physical property of ports.


Release Management Right

At last, release management right


Contents



3. Replacing boards

1. Hardware

2. Software



1)

2)

Disconnecting cables

Removing the GTMU

Procedure of Replacing the GTMU - Hardware operation


Procedure of Replacing the GTMUStep by step On the BSC, run the SET GCELLADMSTAT command to

block all the cells of the base station.

If a static IP-based base station is used, run the LST BTSIPRT command to query the IP address and route information on the BSC.

Record all the cable connections on the panel of the module to the replaced.

Disconnect the transmission cable and CPRI cable from the GTMU and pull out the GTMU.

Set the DIP switches on the new board according to the settings of the DIP switches on the faulty board.

Page65


Procedure of Replacing the GTMU Step by step (Cont.) Check the status of the LEDs to determine whether

the new board works properly.

If a static IP-based base station is used, configure

the static IP data.

Query the software version of the board.

Run the SET GCELLADMSTAT command to unblock

all the cells of the base station

Page66


Replacing the UPEUHardware Operation

1)

2)

Disconnecting the cable

Removing the UPEU


Replacing the UPEU Step by step

M2000 blocks the cells remotely

Power off the board

Disconnect power, monitoring and alarm cable

Remove UPEU

Install new board

Power on the BBU

Check the LED status of the new bioard

M2000 unblocks cells


Replacing the UEIUHardware Operation

1)

2)

Disconnecting the cable

Removing the UEIU


Replacing the UEIUHardware Operation Disconnect monitoring and alarm cable

Remove UEIU

Install new board

M2000: check that no alarms related to the new

board are generated


Replacing the Fan Box Hardware Operation

Raising the adjustable cable trough


Replacing the Fan BoxHardware Operatiom (Cont.)

Removing the fan box


Replacing the Fan Box Step by step Set the DC power switch labeled FAN on the DCDU-01 to OFF.

Label the cables on the panel of the fan box and then remove the cables.

Loosen the captive screws on both sides of the adjustable cable trough. Then, raise the cable trough and fix it at the upper mounting hole, as shown in the figure.

Remove the four screws from the fan box. Pull out the fan box by one-third of its length with one hand by using the handle key, hold the fan box with the other hand, and then pull the entire fan box out of the cabinet.

Install the new fan box.

Place the adjustable cable trough to its original position, and then tighten the captive screws on both sides of the adjustable cable trough.

Install the cables to the panel of the fan box based on the labels.

Set the switch on the DCDU-01 for the fan box to ON.


Replacing a DCDU-01Hardware Operation

1)

2)

Removing the protection cover

Removing the screws from the two mounting ears of the DCDU-01


Replacing a DCDU-01Step by step Power off the BTS3900.

Label the cables connected to the output ports on the DCDU-01, and then disconnect them.

Use the screwdriver to remove the protection cover from the external power input wiring terminal block of the DCDU-01. Label the external input power cable for the DCDU-01, and then disconnect the cable.

Remove the four M6x12 screws from the two mounting ears of the DCDU-01 and remove the DCDU-01.

Install the new DCDU-01 into the position where the original one was located, and then use the four screws to secure the DCDU-01 to the subrack.


Replacing a DCDU-01Step by step (Cont.) Install the new DCDU-01 into the position where the original one was located,

and then use the four screws to secure the DCDU-01 to the subrack.

Insert the OT terminal of the power cable into the corresponding cable hole in the wiring terminal block. Connect the OT terminal of the -48 V power cable (blue) to the terminal labeled NEG(-), and then connect the OT terminal of the GND cable (black) to the terminal labeled RTN(+).

Place the protection cover on the DCDU-01, and then tighten the screws.

Remove the rubber covers from the DCDU-01 power sockets on the new DCDU-01 panel.

Connect the removed cables to the power output ports on the DCDU-01 panel according to the marks.

Power on the BTS3900.


Replacing the PMU/PSUHardware Operation

Removing the PMU/PSU

Setting the DIP switch on new PMU


Replacing the PMU/PSUStep by step This module is hot-swappable.

Replacing the PMU does not affect the services.

Replacing the PSU (AC/DC) causes power-off of the cabinet and thus disrupts all services carried by the base station.

Procedure for replacing PMU

Label the cables on the panel of the PMU, and then disconnect the cables from the PMU.

Loosen the screws on the handle of the PMU panel by using a screwdriver.

Pull the handle gently to disconnect the PMU from the subrack, and then remove the PMU from the slot.

Set the DIP switch on the new PMU.

Loosen the screws on the handle of the PMU. Then, pull the handle outwards.


Replacing the PMU/PSUStep by step Slide the PMU along the guide rails into the slot, and then

push the handle back.

Tighten the screws on the handle.

Connect the cables, which have been disconnected from

the PMU, according to the labels.


Replacing an RFU - Hardware Operation

Label

Removing the RFU


Replacing an RFUGeneral Remarks Replacing an RFU interrupts the services carried on the

RFU.

The electronic labels of boards or modules to be replaced are determined offline on the M2000 or online on the LMT to determine the model of the boards or modules.

It takes about 6 to 10 minutes to replace an RFU, which involves disconnecting the cables, removing screws, removing the faulty RFU, inserting a new RFU, tightening the screws, connecting the cables to the new RFU, and loading the software.

The GRFU V1 can be replaced by the GRFU V2, but the GFRU V2 cannot be replaced by the GRFU V1. The two types of GRFUs are labeled for identification.


Replacing an RFUStep by step Before replacement of the RFU module the M2000 administrator must perform the

following operations: Transfer the services carried on the module if necessary.

Locate the faulty RFU, and then run the associated MML command on the LMT to block the faulty RFU.

Confirm that the TX channel of the RFU is disabled. In this case, the ACT LED on the panel of the RFU blinks (on for 1s and off for 1s).

Set the corresponding DC output power switch on the panel of the DCDU to OFF to power off the RFU.

Label the power cable, RF jumper and CPRI cable on the panel of the faulty RFU, and then disconnect the cables.

Loosen the screws at the four corners of the RFU using a screwdriver, and then pull the RFU outwards by 50 mm to 100 mm using the handle. Hold the RFU with one hand and remove the RFU from the cabinet with the other hand.


Replacing an RFUStep by step (Cont.) Place the new RFU on the corresponding guide rails, and then slide it along the

rails until it is in position, then tighten the captive screws at the four corners to secure the RFU on the subrack.

Insert the CPRI cable, fix the RF jumper (fasten with tightening torque of 25 N·m to 35 N·m) and reinstall the power cable on the panel of the new RFU according to the labels.

Set the corresponding DC output power switch on the panel of the DCDU to ON to power on the RFU.

Check the status of the LEDs to determine whether the new RFU works properly. For details about the status of the LEDs, see the hardware description about the RFU.

Then the M2000 administrator should perform the following operations: Load and activate the RFU software version.

Run the associated MML command to unblock the RFU.

Check that alarms related to the module are not generated.


Replacing an RRUHardware Operation

Loosening captive screws on the main mounting bracket

Tightening screws on the attachment plate

Supporting the RRU bottom

1) 2) 3)


Replacing an RRUGeneral Remarks Replacing an RRU interrupts the services

carried on the RRU.

The electronic labels of boards or modules to be

replaced are determined offline on the M2000 or

online on the LMT to determine the model of the

boards or modules.


Replacing an RRUStep by step Power off the RRU.

Wear an ESD wrist strap or ESD gloves.

Loosen the protection screw on the cover plate of the RRU cabling cavity and then push the handle outwards to open the cover plate.

Record all the cable connections on the panel of the module to be replaced.

Disconnect cables from the ports in the cabling cavity and on the bottom panel.

Loosen the captive screws on the two hoist clamps on the main mounting bracket using an M4 screwdriver.

Tighten the screws on the attachment plate of the RRU using an M6 screwdriver. Use the screw only for removing the RRU, loosen the connection between the attachment plate and the main mounting bracket, and then lift the RRU bottom to remove it.


Replacing an RRUStep by step (Cont.) Tighten the captive screws on the two hoist clamps on the main

mounting bracket to 1.4 N·m (12.39 lbf.in.). Install a new RRU and then waterproof the RRU.

Reconnect all the cables to be connected to the RRU, and verify that vacant cable troughs in the cabling cavity are blocked by waterproof blocks.

Tighten the protection screw on the cover plate to 1.4 N·m (12.39 lbf.in.) and then close the cover plate.

Power on the RRU.

Check the operating status of the new RRU by observing the status of RRU LEDs.


Contents



3. Replacing boards

1. Hardware

2. Software



Upgrading Software through SMT In the left pane of the Site

Maintenance Terminal

System window, select

Board. In the right pane of

the window, double-click

Board Management


Checking the MRFU Software Version Right-click

MRFU0, and

then click Board

Information.

The query is

successful. The

Board

Information

dialog box is

displayed


Checking the GTMU Software Version Right-click

GTMU, and

choose Board

Information

from the

shortcut menu.

The Board

Information

dialog box is

displayed


Upgrading the MBTS Software

Select the program file

Use the maximum value to have faster download speedInput the

program version

Select the program type


Forcibly Loading Software


Activating Software

Input the version number

Input the board number to be

activated

Select the program type


Upgrading Software Through the USB1. Create a pre-configuration script.

Create a .txt, and name it as Precfg.ini. Then, add

the following contents to this file:

[PRECONFIG]

ALL=GTMU|MRFU

2. Save the pre-configuration file in ASCII mode.

3. Copy the file Precfg.ini to BTS3900 GSM directory

in the USB storage device.


4. Save the GBTS software package and

configuration script under the specified path in the

USB device

Upgrading Software Through the USB


Upgrading Software Through the USB1. Insert the USB disk into the USB port on the GTMU, as

shown in figure below.

2. Wait till the GBTS to download the software and

configuration file. When the LED on the USB disk blinks, the

GBTS starts to load the target software and parse the

configuration file.


Upgrading Software Through the USB3. Confirm that the upgrade and data configuration are

completed. The whole process takes about 15

minutes. If either of the following conditions persists

for longer than one minute, you can infer that the

GBTS upgrade and data configuration are

completed.

4. Pull out the USB disk from the GBTS


Contents



3. Replacing boards



BTS Equipment Room Maintenance Items


BTS Power Supply and Grounding System Maintenance Items


Cabinet Maintenance Items


Summary

This course describes the local maintenance of the

BTS, including tools, checking the hardware and the

replacing of hardware and software. A routine

maintenance list is included as well.

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