1 HUAWEI BTS3900 Hardware Structure

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

HUAWEI BTS3900

Cabling Guide Standard

Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page1

Introduction to 3900 series

BTS3900 GSM BTS3900A GSM DBS3900 GSM


Structure of the BTS3900 Cabinet

-48V Cabinet

1) Double radio filter unit

2) Fan box

3) GSM antenna and TMA

control module

4) Baseband unit

5) Direct current distribution

unit


Structure of the BTS3900 Cabinet

+24V or +220V Cabinet

(1) Double radio filter unit

(2) Fan box

(3) Baseband unit

(4) Direct current distribution unit

(5) Cable in/out unit

(6) Power supply unit


BBU

The typical power consumption of BBU is 35W

The weight of the BBU is 12 kg at most.

All the boards can be inserted from the front panel

The Permissible range of power input is –38.4 V DC to –57 V DC


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


GTMU

Controls, maintains, and operates the BTS

Monitors the fan module and the power supply module in the BBU

Distributes and manages BTS clock signals

Provides the Ethernet port for terminal maintenance

Supports four E1 inputs & Ethernet port for transmission.

Provides the CPRI ports for communication with the DRFU


GTMU Ports

Port Type Corresponding Cable Description

CPRI0～

CPRI5

DLC Optical fiber between

BBU and DRFU

Connected to DRFU for the optical signal

transmission

ETH RJ45 Special Ethernet cable Terminal maintenance and commissioning

FE0 RJ45 Ethernet cable A reserved port that performs the following

function: Connects the BBU to a routing

device in the equipment room through the

Ethernet cable for transmission

FE1 DLC Optical fiber

USB USB - A reserved port that performs the following

function: Automatically upgrades the

software through the USB disk

TEST USB - Tests the output clock signals with a tester

E1/T1 DB26

male

BBU E1/T1 Provides the input and output of the four

E1/T1 signals between the GTMU and the

UELP or between the GTMU and the 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

Indicato

r

Color Status Description

STATE

Green Fast flash(0.25s

on，0.25s off)

Can not communicate

with the board and

there is no alarm

generated

Red On There is alarm

Green Slow flash(1s

on, 1s off)

Runs normally


UPEU

The universal power and environment interface unit type A (–48 V)

(UPEU) supports the –48 V DC power input, supplies power to the

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

environment monitoring signalsPort Type Description

MON0 RJ45 Provides the input and output of

the externally collected

environment monitoring signals to the GTMU according to the RS485

communications protocol

MON1 RJ45 Same as MONO0

EXT-

ALM0

RJ45 Transmits the externally collected

environment monitoring signals to

the GTMU through communications protocol related

to the dry contact

EXT-

ALM1

RJ45 Same as EXT-ALM0

PWR 3V3 -48V DC 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

Port Type Description

MON0 RJ45 Provides the input and output of

the externally collected

environment monitoring signals to the GTMU according to the RS485

communications protocol

MON1 RJ45 Same as MONO0.

EXT-

ALM0

RJ45 Transmits the externally collected

environment monitoring signals to

the GTMU through communications protocol related to the dry contact

EXT-

ALM1

RJ45 Same as EXT-ALM0.


UELP

UELP is the E1/T1 signal lightening protection unit of BBU and

it can provide protection for 4 route E1/T1 signal

Port Type Relative cables Description

INSIDE DB25 male E1

transferring

cable

Transfers the four E1/T1

signals between the UELP

and the GTMU

OUTSIDE DB26 male E1/T1 cable Provides the input and

output of the four E1/T1

signals between the BBU

and the BSC


BBU Cables

Grounding cable, -48DC power cable, E1/T1 cable, E1 transferring

cable, main node alarm signal cable, FE port cable, CPRI port signal

cable and transmission cabinet monitoring cable


DCDU Panel

a: Power switch b: Power output ports


Ports of the MRFU

Type Connector Ports Description

Port for

transmitting

and

receiving

RF signals

N female

connector

ANT_TX/RXA Used in connection to the antenna subsystem

ANT_RXB

CPRI

port

SFP female

connector

CPRI0 Used in connection to the BBU, or in

connection to the upper-level cascaded

MRFU

CPRI1 Used in connection to the lower-level

cascaded MRFU

Port for

transmitting

RF signals

between

MRFUs

QMA female

connector

RX1 in Input port for diversity signals in antenna

channel 1

RX1 out Output port of diversity signals in antenna

channel 1

Power

port

7W2 power

connector

PWR Receives power input


Cable Connection of -48V Cabinet

Cable

Number

Cable Name Qua

ntity

R1-R12 RF Jumpers 12

P1-P2 External Power Cables (-48 V) 2

P3-P8 Power Cables Between the DCDU and DRFUs 6

P9 Power Cable Between the DCDU and Fan Box 1

P10 Power Cable Between the DCDU and BBU 1

P11-P12 Reserved 2

S1-S6 CPRI Signal Cables Between the BBU and

DRFU

6

S7 E1 Transfer Cable of the BBU 1

S8 Monitoring Signal Cables for the DCDU 1

S9 Monitoring Signal Cable for the Fan Box 1

S10 E1/T1 Cable of the BBU 1


MRFU Topologies Configuration

The MRFU supports various

network topologies: star,

chain, and ring

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1 HUAWEI BTS3900 Hardware Structure

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