HUAWEI GSM DBS3900 Hardware Structure pot

2008-03
www.huawei.com
HUAWEI Condential
Security Level: Internal Use
HUAWEI GSM DBS3900
Hardware Structure
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DBS3900 is a distributed BTS solution developed by Huawei
Technologies Co.,Ltd. Its baseband part and radio part can be
installed independently so that it can be used to various
environments with wide coverage and low cost.
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
Know the functions and features of DBS3900

Master the Hardware structure and function of DBS3900

Familiar with the Typical configuration and cable
connection of DBS3900

Master the Network topologies of DBS3900
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
DBS3900 Electronic Documentation


BBU3900 Quick Installation Guide

RRU3004 Quick Installation Guide

DBS3900 Deployment Guide
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Chapter 1 DBS3900 System Description
Chapter 1 DBS3900 System Description
Chapter 2 DBS3900 Hardware Structure
Chapter 3 DBS3900 Typical Configuration
Chapter 4 DBS3900 Network Topologies
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Location
PSTN
ISDN
PSPDN
Um Interface
DBS3900
DBS3900
DBS3900
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM

A Interface
MAP
M
A
P
TUP,ISUP
MS
MS
MS
MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller
HLR: Home Location Register AUC: Authentication Center EIR: Equipment Identity Register
MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center
VM: Voice Mailbox OMC: Operation and Maintenance Center DBS ： Distributed Base Station
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Functions and Features

Wide coverage, low cost

Suitable for various environments, flexible installation

Support PGSM900M 、 EGSM900 、 DCS1800M

One RRU module can support 2 TRXs

Support transmit diversity

Support PBT


Support four-way receive diversity over different RRU

BBU support star, tree, chain and ring topology

Calculate TA exactly

Support GPRS and EGPRS
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Functions and Features

Support Omni-directional coverage and directional coverage

One BBU can support 36TRX at most and 12 cells at most

Support A5/3, A5/2, A5/1 encryption and decryption

Support dynamic radio frequency management

Cell broadcasting service and point-to-point short message

Support mixed combining with BTS3012

Support -48VDC power input
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Chapter 1 DBS3900 System Description
Chapter 2 DBS3900 Hardware Structure

Chapter 2 DBS3900 Hardware Structure
Chapter 3 DBS3900 Typical Configuration
Chapter 4 DBS3900 Network Topologies
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Abbreviation
RRU Remote Radio unit
BBU Base Band unit
GTMU Transmission& Timing& Management Unit for BBU
UPEA
Universal power and Environment interface unit
Type A (-48v)
BSBC Universal BBU Subrack Backplane Type C (2U)
UBFA Universal BBU Fan Unit Type A (2U)
UEIU Universal Environment Interface unit
UELP Universal E1/T1 Lighting Protection unit
UFLP Universal FE/GE Lighting Protection unit
CPRI Common Protocol Radio Interface
APM Advanced Power Module
IBBS Integrated Backup Battery System
OFB Outdoor Facility Box
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Sector 1 DBS3900 Hardware Components
Sector 1 DBS3900 Hardware Components
Sector 2 BBU3900 System Structure
Sector 3 RRU3004 System Structure
Sector 4 DBS3900 Typical Scenario

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DBS3900

The DBS3900 consists of the BBU3900 and the RRU3004.

The BBU3900 is an indoor baseband unit. It provides physical interfaces for
connection with the BSC and RRU. It performs centralized management (OM
and signaling processing) of the entire base station system and provides
reference clock for the system.

The RRU3004 is an outdoor remote RF unit. It processes baseband signals
and RF signals.

The Local Maintenance Terminal (LMT) and Man-Machine Interactive (MMI)
can implement the maintenance of the DBS3900 through the BBU3900.
BBU3900
RRU3004
RRU3004 RRU3004
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APM30 Overview

The APM30 provides –48 V DC power
and power backup for the distributed
base stations and mini base stations,
and provides space for the user
equipment. It also performs functions

such as battery management and
monitoring, and lightning protection.
1. Filler panel(1U)
2. Power sub-rack (3 U)
3. DC PDU(2U)
4~8. Filler Panel(1U)
9. Space for batteries (3U)
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OFB Overview

OFB (Outdoor Facility Box)
supports DC power input
and DC power distribution
and can serve as a cabinet
for the transmission
equipment, provides 11U
installation space.

Since it has no heating
system, the OFB is unable
to adapt to low-temperature
environment. The OFB is
applicable to category C
environment.
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IBBS Overview


As an auxiliary product for Huawei outdoor BTSs, the
Integrated Backup Battery System (IBBS) provides
backup power to meet the requirements for fast
network deployment.

Output: -48V DC.

Backup power mode: serial or parallel connection
between batteries.

Operating temperature: The IBBS cabinet is functioning
normally when the temperature is +55°C.

Alarm system: It provide door control, smog and
temperature sensors.

A maximum of 16 batteries of 12 V 100 Ah or 2 V 150
Ah, four batteries in one group and four groups in the
IBBS cabinet.
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Sector 1 DBS3900 Hardware Components
Sector 2 BBU3900 System Structure
Sector 2 BBU3900 System Structure
Sector 3 RRU3004 System Structure
Sector 4 DBS3900 Typical Scenario
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BBU3900

The BBU3900 is an indoor BTS control unit that enables interaction
between the BTS and the BSC.

The BBU3900 performs the following functions:

Provides physical interfaces between the BTS and the BSC for
interaction.

Provides CPRI ports for communication with the RRU3004.

Provides the USB port for downloading the BTS software.

Provides OM channels for connection to the LMT (or M2000).

Processes UL and DL data.

Provides centralized management on the entire DBS system, such as
OM and signaling processing.

Provides the reference clock for the entire system.
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Logical Structure of the BBU3900
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Hardware Components of BBU3900

The typical power consumption of the BBU is 35 W.

The weight of the BBU isn’t more than 12KG.

Each BBU3900 supports a maximum of 36 TRXs, and 12 cells.

The BBU is a small box with all the external ports on the front panel.

The BBU3900 boards consist of the BSBC, UEIU, GTMU, and UELP; the
BBU3900 modules consist of the UBFA and the UPEU.
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BSBC Board

The BSBC is the backplane of the BBU. The BSBC provides eight
board slots, two power slots, and one fan slot.

The universal BBU sub-rack backplane type C (2U) (BSBC) provides
backplane interfaces for communication between boards and supplies
power for boards.

The GTMU is located in slots 5 and 6, slot 7 for a main control board
that supports 3G, and other ports as common slots.
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GTMU Board


The GSM transmission, timing, and management unit for BBU (GTMU)
controls and manages the entire BTS. It provides interfaces related to the
reference clock, power supply, OM, and external alarm collection.

The GTMU performs the following functions:

Controls, maintains, and operates the BTS

Supports fault management, configuration management, performance
management, and security management

Monitors the fan module and the power supply module

Distributes and manages BTS clock signals

Provides clock input for testing

Provides the Ethernet port for terminal maintenance

Supports four E1 inputs

Provides the CPRI ports for communication with the RRU
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GTMU Board

Ports on the GTMU Panel

Port Type Cable Description
CPRI0–
CPRI5
DLC
connector
CPRI optical cable
between the BBU
and the RRU
Provides the input and output of the optical signals
ETH RJ45
connector
Crossover cable
(delivered with the
equipment)
Performs local maintenance and commissioning
FE0 RJ45
connector
- A reserved port that performs the following function:
Connects the BBU to a routing device in the equipment room
through the Ethernet cable to transmit network information
FE1 DLC
connector
- A reserved port that performs the following function:
Connects the BBU to a routing device in the equipment room
through the optical cable to transmit network information
USB USB
connector
- A reserved port that performs the following function:
Automatically upgrades the software through the USB disk
TST USB

connector
- Tests the output clock signals with a tester
E1/T1 DB26 male
connector
E1/T1 cable of the
BBU
Provides the input and output of the four E1/T1 signals
between the GTMU and the UELP or between the GTMU and
the BSC
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GTMU Board

LEDs on the GTMU Panel
LED Color Status Description
RUN Green On The board is faulty.
Off There is no power supply or the board is faulty.
Blinking once/2s The board is operational.
Blinking once/4s The OML link is abnormal.
Blinking four
times/s
The board is loading software.
ALM Red On A fault occurs in the running board.
Off An alarm is not generated.
ACT Green On The board is operational.
Off The board is faulty.
LIU0–LIU3 Green On A local E1/T1 alarm is generated.
Blinking four
times/s

A remote E1/T1 alarm is generated.
Off This link is not used or the alarm is cleared.
CPRI0-CPRI5 Green On The CPRI link is functional.
Red On The reception of the optical module is abnormal and an alarm
is triggered.
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GTMU Board

DIP Switch of GTMU
DIP
switch
DIP status Description
1 2
SW1 ON ON The E1 impedance is
set to 75 Ω.
OFF ON The E1 impedance is
set to 120 Ω.
ON OFF The T1 impedance is
set to 100 Ω.
DIP
switch
DIP status Description
1 2 3 4
SW2 ON ON ON ON The E1 cable
is grounded.
OFF OFF OFF OFF The E1 cable
is not
grounded.

DIP
switch
DIP status Description
1 2 3 4
SW4 ON ON ON ON The E1 link can be
bypassed.
OFF OFF OFF OFF The E1 link cannot be
bypassed.
SW5 ON ON ON ON The E1 link cannot be
bypassed.
OFF ON ON OFF The E1 link of the Level
1 cascaded BTS can be
bypassed.
ON OFF ON OFF The E1 link of the Level
2 cascaded BTS can be
bypassed.
OFF OFF ON OFF The E1 link of the Level
3 cascaded BTS can be
bypassed.
ON ON OFF OFF The E1 link of the Level
4 cascaded BTS can be
bypassed.
OFF ON OFF OFF The E1 link of the Level
5 cascaded BTS can be
bypassed.
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UBFA Module


The universal BBU fan unit type A (2U) (UBFA) communicates with the
GTMU to regulate the temperature, adjust the fan speed, and report
alarms. The UBFA module is hot swappable.
LED Color Status Description
STATE Green Blinking twice per
second
The board is not securely
connected. An alarm is not
generated.
Red On An alarm is generated.
Green Blinking once
every two
seconds
The board operates normally.