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

Page5

BTS3900 BTS3900A

Indoor macro

cabinet

Indoor BTS

BTS 3900

Outdoor BTS

BTS 3900A

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page6

DBS3900 System Overview

DBS3900 components:

BBU3900

RRU3908, RRU3804, RRU3008

MBSC

Power cable

Power cable Trunk 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. Page8 Page8

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 Connecto

r Type Description

CPRI0 to

CPRI5 SFP

Ports 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/T1 DB26

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

STATE Red

/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.

OFF The 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

MON

0 RJ45

Transmitting two RS485

environment monitoring

signals

MON

1 RJ45

Transmitting two RS485

environment monitoring

signals

EXT-

ALM0 RJ45

Transmitting four dry contact

alarms

EXT-

ALM1 RJ45

Transmitting 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

Label Connector

Type Description

MON0 RJ45 One RS485 signal

MON1 RJ45 One RS485 signal

EXT-

ALM0 RJ45

Four dry contact

signals

EXT-

ALM1 RJ45

Four 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)



Cabinet (+24 V DC)



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. LEDs

2. 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

1

2

3


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 GRFU Port Label Function

RF

ANT_RXB RF RX port, connecting to the antenna

system.

ANT_TX/RX

A

RF TX/RX port, connecting to the antenna

system.

CPRI

CPRI0 Connecting the BBU or the upper-level

cascaded GRFU.

CPRI1 Connecting the BBU or the lower-level

cascaded GRFU.

Inter-GRFU

RF signal

RX_INB Input port for diversity receive.

RX_OUTA Output port for main receive.

Power

supply PWR

Introducing power input.

Monitoring MON Monitoring and maintaining port.


MRFU Ports Port Type Label

Connector

Type Description

Port for

transceiving

RF signals

ANT_RXB DIN

connector

Connecting to the antenna

subsystem. ANT_TX/RXA

CPRI

CPRI0

SFP female

connector

Connecting to the BBU, or

the upper-level RFU during

the cascading.

CPRI1

Connecting to the lower-

level RFU during the

cascading.

Interconnec

tion port

for RF

Receive

signals

RX_INB QMA

female

connector

Input port of diversity

signals in the

antenna channel.

RX_OUTA

Output port of diversity

signals in the

antenna channel.

Power

supply port PWR

3V3 power

connector Feeding power.

Monitoring

port MON

RJ45

connector

RS485 Monitoring、

debugging port.


MRFU LED

Label Status Description

RUN

ON The power input is normal, but the

module is faulty.

OFF There 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.

ALM ON The module is in the alarm status.

OFF No alarm is generated.

ACT

ON The module is functional and is

connected to the BBU.

OFF The module is not connected to the BBU.


1s The module is in the local test status.


MRFU LED

VSWR OFF (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.


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.


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 Ports Item 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 LEDs LED Color Status Description

RUN Green

ON The RRU is faulty.

OFF No power input is available.

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

ON for 0.25s

OFF 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.

ACT Green 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 ON

1s OFF A VSWR alarm is generated on the ANT_TX/RXB port.

ON A VSWR alarm is generated on the ANT_TX/RXA port.

0.125s ON

0.125s 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.

Red

The 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.

OFF The 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.

Red

The 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.

OFF The 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 respectively

NOTE:

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



GSM + 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 Pane

View 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



Step 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.

Page64



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

Page65


Replacing the UPEU

Hardware 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 UEIU

Hardware Operation

1)

2)

Disconnecting

the cable

Removing the UEIU


Replacing the UEIU

Hardware 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 Box

Hardware 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-01

Hardware Operation

1)

2)

Removing the protection cover

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


Replacing a DCDU-01

Step 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-01

Step 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/PSU

Hardware Operation

Removing the PMU/PSU

Setting the DIP switch on new PMU



Step 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.



Step 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 RFU

General 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 RFU

Step 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 RFU

Step 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 RRU

Hardware Operation

Loosening captive screws

on the main mounting bracket

Tightening screws on

the attachment plate

Supporting the RRU bottom

1) 2) 3)


Replacing an RRU

General 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 RRU

Step 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 RRU

Step 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 speed Input 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 USB

1. 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




1. 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.



3. 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.

Thank you www.huawei.com

omb121430 mbts gsm v100r004 field maintenance issue1.00

Documents

routine maintenance

main mounting

dry contact

based base

adjustable

port labeled

transmit network

site local