www.huawei.com Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved. HUAWEI BTS3900A Hardware Structure
Jan 01, 2016
www.huawei.com
Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
HUAWEI BTS3900A Hardware Structure
Page1Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ForewordThe BTS3900A developed by Huawei is an outdoor macro BTS
that performs the same tasks as the BTS3900. The BTS3900A
mainly consists of the BBU and DRFU. Compared with
traditional BTS, the BTS3900A features simpler structure and
higher integration
Page2Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
References31183199-BTS3900A GSM Documentation
BTS3900A GSM Hardware Description
BTS3900A GSM Product Description
Page3Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ObjectivesUpon completion of this course, you will be able to:
Know the application scenarios of BTS3900A
Grasp the hardware structure of BTS3900A
Grasp the functions of the modules
Master typical configuration of BTS3900A
Know the networking topology of BTS3900A
Page4Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page5Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Location of BTS3900A
PSTN ISDN
PSPDN
Um Interface
BTS3900A
BTS3900A
BTS3900A
BTS3900A
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAPMAP
TUP,ISUPMS
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
Page6Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Functions and FeaturesIt supports the Abis IP/FE interface in hardware and enables Abis
over IP through software upgrade if required
It supports transmit diversity and PBT
It supports 2-antenna and 4-antenna receive diversity to improve
the uplink coverage
It supports multiple frequency bands, such as PGSM900,
EGSM900, and GSM1800
It supports the GPRS and EGPRS
Page7Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Functions and FeaturesWhen the DRFU is configured, a BTS3900A can support a maximum of 12 carriers in the maximum cell configuration of S4/4/4. In addition, a site configured with the BTS3900As can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12
When the GRFU is configured, a BTS3900A can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12. In addition, a site configured with the BTS3900As cansupport a maximum of 72 carriers in the maximum cell configuration of S24/24/24
Page8Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page9Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900A Hardware Components
2.1 BTS3900A Overview
2.2 BBU Unit
2.3 RF Cabinet
2.4 Power module and Components
Page10Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900AThe BTS3900A consists of the AC cabinet and DC cabinet
The AC cabinet consists of the APM30H and RF cabinet, and
the BBU3900 is installed in the APM30H
The DC cabinet consists of the TMC11H and RF cabinet, the
BBU3900 is installed in the TMC11H
The RFUs are installed in the RF cabinet
Page11Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Cabinet of BTS3900A
Mode Maximum Power Consumption (W)
Typical Power Consumption (W)
900 MHz 2180 1250
1800 MHz 2480 1400
Configuration Type Weight (kg)
RF cabinet (DRFUs not involved) 42
RF cabinet (DRFUs involved) 114
APM30 power distribution cabinet (BBU not involved) 54
APM30 power distribution cabinet + RF cabinet 178
APM30/TMC
RFCabinet
Page12Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900A AC Cabinet The BTS3900A AC cabinet
consists of the RF cabinet and
the APM30H.
(1) RF cabinet (2) RFU (3) FAN unit
(4) FMUA (5) DCDU-02 (6) GATM
(7) BBU (8) PDU(9) Power sub-rack(AC/DC)(10)
APM30H - -
Page13Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900A AC CabinetBTS3900A consists of one RF cabinet, one APM30H, one TMC11H, and one IBBS200T
(1) RF cabinet (2) RFU (3) FAN unit
(4) FMUA
(5) DCDU-02 (6) GATM
(7) BBU (8) PDU (9) Power subrack(AC/DC)
(10) APM30H
(11) DCDU-03A
(12) Transmission unit
(13) TMC11H
(14) Battery (15) IBBS200T
Page14Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900A DC CabinetBTS3900A DC cabinet consists
of one RF cabinet and one
TMC11H
(1) RF cabinet
(2) RFU (3) FAN unit
(4) FMUA (5) DCDU-02 (6) GATM
(7) BBU (8) DCDU-06A (9) TMC11H
Page15Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Logical Structure
Page16Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900A Hardware Components
2.1 BTS3900A Overview
2.2 BBU Unit
2.3 RF Cabinet
2.4 Power module and Components
Page17Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BBUThe 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
Page18Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Working Principles of the BBU
Page19Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Boards and Modules in BBUBSBC: 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
Page20Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BSBC BoardThe BSBC provides slot 6 for the GTMU, slot 7 for a main control board that supports 3G, and slots 0 to 5 as common slots. The GTMU is 1 U high. Therefore, from the view of the front panel, the GTMU is located in slots 5 and 6
Provide backplane interfaces, communication channels, distribute clock signal and +12V power supply for the other boards
Page21Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GTMUControls, maintains, and operates the BTS
Monitors the fan module and the power supply module
Distributes and manages BTS clock signals
Provides the Ethernet port for terminal maintenance
Supports four routes of E1 inputs
Provides the CPRI ports for communication with the DRFU
Page22Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GTMU PortsLabel Connector
Type Description
CPRI0-CPRI5 SFP Ports for the communication between the BBU and the RF module;
support input and output of the optical and electrical signal .
ETH RJ45 Port for local maintenance and commissioning
FE0 RJ45A 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 DLCA 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 A reserved port that performs the following function:Enables the automatic software upgrade from a USB disk.
TST USB Provids a reference clock for the tester.
E1/T1 DB26female
Provides the input and output of the four E1/T1 signals between the GTMU and the UELP or between the GTMU and the BSC.
Page23Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GTMU Indicators LED Color Status Description
ON The board is faulty.
OFF No power supply is available or the board is faulty.
ON for 1s, OFF for 1s The board is operational.
ON for 2s, OFF for 2s The OML link is abnormal.
ON for 0.125sOFF for 0.125s The board is loading software.
ON A fault occurs in the running board.
OFF No alarm is generated.
ON The board is operational.
OFF The board is faulty.
ON This link is not used.
ON for 0.125sOFF for 0.125s A remote E1/T1 alarm is generated.
OFF This link is operational.
Green ON The CPRI link is normal.
Red ON The reception of the optical module is abnormal and an alarm is generated.
CPRI0-CPRI5
LIU0-LIU3 Green
ACT Green
ALM Red
RUN Green
Page24Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
UELPUELP 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 cableProvides the input and output of the four E1/T1 signals between the BBU and the BSC
GTMU
Page25Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
UPEUThe 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
signalsPort Type Description
MON0 RJ45 Transmitting two RS485 environment monitoring signals
MON1 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
Page26Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
UEIUUEIU 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
Page27Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Monitoring System
Page28Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
USCUThe Universal Satellite Card and Clock Unit (USCU) is compatible with six types of satellite card, provides absolute timing information and the 1 Pulse Per Second (PPS) reference clock for the main control board, and provides the RGPS ports and BITS port.
Port Description
1 GPS port Used for receiving GPS signals
2 RGPS ports Used for receiving RGPS signals
3 BITS port Connected to the BITS clock; supporting adaptive input of the 2.048 MHz and 10 MHz clocks
4 TEST port Used for testing the clock
Page29Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
UBFAThe 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
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.
STATE
Red/Green
Page30Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BBU Cables ConnectionBBU cables connection between BBU, BSC, RFU and Auxiliary equipment
Page31Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BBU Hardware structure-ReviewPlease fill the board’s name in the blank of the BBU
panel
Page32Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900A Hardware Components
2.1 BTS3900A Overview
2.2 BBU Unit
2.3 RF Cabinet
2.4 Power Cabinet
Page33Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
RF CabinetRF Unit
DRFU
GRFU
DCDU-02
FAN Unit
FMUA
Door Sensor
Page34Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
RF UnitRF Unit handles modulation and demodulation between
baseband signals and RF signals, data processing, and
combining-distribution. There are two kinds RF Unit, DRFU
and GRFU
One Double Radio Frequency Unit (DRFU) provides 2 TRXs.
One GSM Radio Frequency Unit (GRFU) provides a
maximum of 6 TRXs.
Page35Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of DRFU
One double radio filter unit (DRFU) provides two TRXs
The DRFU performs modulation and demodulation between
baseband signals and RF signals, processes data, and
combines and divides signals
Page36Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Working Principles of the DRFU The DRFU consists of the high-speed interface unit, signal
processing unit, power amplifier, and dual-duplexer
Page37Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Ports of the DRFU Type Connector Ports Description
ANT1Port for transmitting and receiving RF signals
N female connector ANT2
Used in connection to the antenna subsystem
CPRI0 Used in connection to the BBU, or in connection to the upper-level cascaded DRFU
CPRI1 Used in connection to the lower-level cascaded DRFU
RX1 in Input port for diversity signals in antenna channel 1
RX1 out Output port of diversity signals in antenna channel 1
RX2 in Input port for diversity signals in antenna channel 2
RX2 out Output port of diversity signals in antenna channel 2
Power port 7W2 power connector PWR Receives power input
Port for transmitting RF signals between DRFUs
QMA female connector
CPRI port SFP female connector
Page38Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of the DRFU LED Color Status Description
On The power input is normal, but the module is faulty.
Off No power input is available, or the module is faulty.
On for 1s Off for 1s The module is functional.
On for 0.125s Off for 0.125s The module is loading data.
On for 1s Off for 1s A fault alarm is generated.
Off No alarm is generated.
On A fault alarm is generated, need to chang another module.
On The module is functional and is correctly connected to the BBU.
Off The connection with the BBU is not established.
On for 1s Off for 1s
The DRFU is being tested on the Site Maintenance
ACT Green
ALM Red
RUN Green
Page39Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of the DRFU Off No VSWR alarm is detected.
On for 1sOff for 1s
The VSWR alarm is generated only on the ANT2 port.
On for 0.125s Off for 0.125s
The VSWR alarms are generated on the ANT1 and ANT2 ports.
On The VSWR alarm is generated only on the ANT1 port.
On (green) The CPRI link is functional.
On (red) The interface module fails to receive signals.On for 1sOff for 1s (red)
The CPRI link has a loss-of-lock error.
On (green) The CPRI link is functional.
On (red) The interface module fails to receive signals.On for 1sOff for 1s (red)
The CPRI link has a loss-of-lock error.
CPRI1Red Green
CPRI0Red Green
VSWR Red
Page40Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
QuestionIf the ‘VSWR’ is always on, what does it mean? Can you describe the Impact on the system and the reasons?
It means only ANT1 have VSWR Alarm. Once the alarm is generated, the service carried by the TRX is totally interrupted.
The reasons list as following:The VSWR of the antenna system is too high.
The connection between the output port of the TRX and the feederis improper.
The antenna system is not in connection for the DRFU.
The DRFU is faulty.
Data configuration in BSC is incorrect.
Page41Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Output power of DRFUWorking Band Frequency Range Working
ModeOutput Power (GMSK/8PSK)
Non-combination 45 W/30 W
Combination 20 W/14 W
PBT 71 W/47 W
Non-combination 40 W/26 W
Combination 18 W/12 W
PBT 63 W/42 W
GSM 1800 MHz TX: 1805-1880 MHz RX: 1710-1785 MHz
PGSM 900 MHzEGSM 900 MHz
PGSM: •TX: 935-960 MHz •RX: 890-915 MHz EGSM: •TX: 925-960 MHz •RX: 880-915 MHz
Page42Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DCDU-02 ModuleThe direction current distribution unit (DCDU) provides -48 V DC power (four outputs)
Receiving -48 V DC power input
Providing -48 V DC power for boards and modules in the cabinet
DCDU-02 (four outputs) on the left
DCDU -02 (four outputs) on the right
Page43Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Fan ModuleThe fan module performs the heat dissipation for the
cabinet.
One fan module is installed with two fans.
Provides forced ventilation and heat dissipation.
Supports the temperature detection.
Page44Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
FMUA BoardThe FMUA is a fan environment monitoring unit.
Leading -48 V DC power supply to the cabinet and supplying -48 V DC power supply for the fan module.
Collecting environment alarm information in the cabinet. The environment alarm is classified into temperature alarm, humidity alarm, smoke alarm, water immersion alarm, and door status alarm.
Supporting the detection and reporting of the temperature.
Page45Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
FMUA LEDsLED Color Description Status Description
Blinking once every two seconds
The board is running normally and the communication with the BBU is normal.
Blinking four times per second
There is power supply but the communication with the BBU is abnormal.
Off No power input is available.Blinking four times per second
There are alarms from both the fans on the left and right half subracks.
Blinking once every two seconds
There is an alarm from the fan on the right half subrack.
On There is a alarm from the fan on the left half subrack
Blinking once every four seconds Other alarms
Off No power input is detected.
ALARM Red
Indicates whether there are alarms
RUN Green
Indicates the running status of the board
Page46Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
FMUA PortsType Ports Connector Description
Power port -48 V 7W2 power connector –48 V DC power input
COM IN RJ45 connector Used in connection to the BBU or the monitoring port on the upper-level FMUA
COM OUT RJ45 connector Used in connection to the lower-level FMUATEM RJ45 connector Cabinet temperature monitoring portTEM_HUM ARRESTER RJ45 connector Used in connection to the surge protection
failure alarm port of the power distribution unitFAN0FAN1
4-pin connector Used in connection to the fan module on the left half subrack
FAN2FAN3
4-pin connector Used in connection to the fan module on the right half subrack
The first group (from left to right)
Dry contact connectors
The second group
Dry contact connectors
The third group Dry contact connectors Smoke sensor port, door status sensor port
The fourth group Dry contact connectors Water sensor ports
Extended Boolean portsBoolean port
Fan port
RS485 port
Page47Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Door Status SensorThe door status sensor detects the opening and closing of the
cabinet door. It consists of two parts, the magnet part and the
switch part.
Magnet part Switch part
Page48Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. BTS3900A Hardware Components
2.1 BTS3900A Overview
2.2 BBU Unit
2.3 RF Cabinet
2.4 Power Cabinet
Page49Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Power Cabinet – APM30HGATM
Power Subrack(AC/DC)
PDU
APMI
AFMU
Heater
Battery
Door Status Sensor
Temperature Sensor
Page50Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
APM30 OverviewThe APM30 provides –48V 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 lightening protection
1. Filler panel (1U)2. Power subrack (3U)3. DC PDU (2U)4~8. 1U Filler panel9. Space for batteries (3U)
Page51Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Main Functions of GATM The GSM antenna and TMA control module (GATM) is a module that controls the antenna and TMA. The GATM is optional when the DRFU module is configured.
Controls the RET antenna
Feeds power to the TMA
Reports the RET control alarm signals
Monitors the current from the feeder
Page52Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Ports on the GATM
Ports Connector FunctionANT0ANT2 ANT4
SMA female Providing power for the RET antenna and transmitting control signals for the RET antenna
ANT1ANT3 ANT5
SMA female Providing power for the antenna
COM1 RJ45 Used in connection to the BBU
COM2 RJ45 Providing the extended RS485 port to be cascaded with other devices
-48 V 7W2 Receiving the -48 V power input
Page53Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Power Subrack (AC/DC) The power subrack (AC/DC) consists of the PMU, PSU (AC/DC)
and the wiring unit of the power subrack (220 V).
The power subrack (AC/DC) converts the 220 V AC power to the -
48 V DC power.
1) PMU2) PSU 3) Wiring unit
Page54Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
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
Page55Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Ports of PMU
Ports Function
RS232/RS422 port Used in communication with the central processing unit
Battery switch
The battery switch has two control ports ON and OFF, which are used for switching on and switching off the batteryPress and hold the port ON for 5-10 seconds to switch on the batteryPress and hold the port OFF for 5-10 seconds to switch off the battery
Power supply test port
Two power supply test holes -48V and 0V are available for measurement through an ordinary multi-meter
COM port Used in connection to the external signal transfer board
Backplane port Used in connection to the backplane
Page56Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
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
Page57Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Power Subrack (AC/DC)—Wiring Unit
The wiring unit is connected to the external power supply through the terminals L and N wires, and leads the power to the PSU (AC/DC)through the backplane.
The PSU (AC/DC) converts the input AC power into the -48 V DC power.
The DPMU monitors the operating status of the PSU (AC/DC).
The wiring unit provides -48 V DC power outputs through LOAD1(-), LOAD2(-), and RTN(+).
Page58Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDU ModuleThe PDU (Power Distribution Unit) performs AC or DC power distribution
Supplies two AC power outputs with the maximum current of 10 A to the heaters of the power cabinet and the heating film of the battery cabinet
Provides 10 DC power outputs to meet the DC power requirements of the distributed base station or the separated base station
Reports the surge protection alarms of the AC or DC output power
Page59Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDU PortsSN Description
1 For the 110 VAC dual-live-wire input, use L2 For the single-phase 220 VAC/three-phase 220 VAC input, use N1 and N2
2 For the 110 VAC dual-live-wire input, use L1 For the single-phase 220 VAC/three-phase 220 VAC input, use L1, L2 and L3 3 AC output wiring terminals (Lout1, Lout2)
4 AC output wiring terminals (Nout1, Nout2)
5 AC input MCB
6 AC output MCB (controls the power supply to the heating film or heaters)
7 DC output MCBs (SW0-SW9)
8 DC output wiring terminals (LOAD0-LOAD9)
Page60Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
APMI BoardThe APMI board refers to APM Power Monitor unit Interface
board
Transfers the APM30 serial port communication signals, Boolean
input/output signals, and EMI signals.
Protects the dry contact input/output signals and RS485 signals
(connected to the BBU/BTS)
Page61Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
APMI PortsPort Connector Type Quantity Function
RS422 RJ45 connector 1 Connecting the monitoring signal cable between the PMU and the APMI
TX+, TX-, RX+, RX-
2-pin molex connector 2 Connecting the monitoring signal cable between the APMI and the BBU
IN1-IN3 2-pin molex connector 3 Connecting the dry contact alarm input cableOUT1 2-pin molex connector 1 Connecting the optical coupling alarm output cable
Page62Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
AFMU BoardProvides DC power supply to the APMI and AFMU boards through the DC power port
Supplies DC power to the two fans at the top of the cabinet and reports the alarms of the fans
Reports the alarms of the internal ambient temperature sensor, air inlet temperature sensor, and air outlet temperature sensor
Page63Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
AFMU Ports and LEDsSN Port Function
1 ALMConnecting the monitoring signal cable between the
AFMU and the APMI
2 DC INPUT
Connecting the DC power cable of the AFMU
LED Silkscreen Color Status Description
ON steady About 1 minute after the AC or DC power-on
1s ON and 1s OFF The system is working properly.
0.125s ON0.125s OFF
The serial port communication is disrupted. The other communication is normal.
OFF steady The system is not powered on.ON steady An alarm is generated.
OFF steady No alarm is generated, or the system is not powered on.
Alarm LED ALM Red
Operation LED RUN Green
Page64Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
HeaterThe heater functions in the low-temperature environment to
provide suitable working temperature for the batteries in the
power cabinet or transmission cabinet.
When the internal temperature of the cabinet is lower than 5℃, the heater starts to work; when the internal temperature
is higher than 15℃, the heater stops working.
Page65Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BatteryThe power cabinet can house 1 to 3 groups of -48 V 12 AH
batteries, which can form the -48 V 12 AH battery group
system, the -48 V 24 AH system, or the -48 V 36 AH system.
Page66Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Door Status SensorThe door status sensor is made up of two parts, the
magnet part and the switch part.
Page67Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Temperature SensorThe temperature sensors of the APM30 consist of the air inlet temperature sensor, internal ambient temperature sensor, and the air outlet temperature sensor
Page68Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Question Would you please describe Power Distribution Modes of
BTS3900A?
Page69Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
IBBS200T OverviewThe IBBS200T provides long-time backup power for the
BTS3900A. It is used outdoors.
Page70Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
TMCThe TMC can accommodate the transmission equipment
of the user. It is used outdoors.
1 Filler panel2 Inner air circulation fan
3 HEUA 4 DCDU-03
5 Outer air circulation fan
6 Core of the heat exchange
Page71Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page72Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS3900A Signal FlowThe signal flow of the BTS3900A consists of the traffic
signal flow and the signaling flow of the BTS.
DL traffic signal flow
UL traffic signal flow
Signaling flow
Page73Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Traffic Signal FlowThe DL traffic signal flow is transmitted from the BSC to the MS
through the BTS3900A. The BBU and RFUs work together to
process the DL traffic signals
Opposite to the DL traffic signal flow, the UL traffic signal flow is
transmitted from the MS to the BSC through the BTS3900A. The
BBU and RFUs work together to process the UL traffic signals
BBU DRFUE1
CPRI
DBUSCBUSFHBU
S
RF
BSC
Page74Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Signaling FlowThis describes the BTS3900A signaling flow on the Abis
interface. The BBU serves as the control unit and works with
the RFUs to process the signaling.
BBU DRFUE1 CPRI
DBUSCBUS
FHBUS
BSC
Page75Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page76Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
4. Configurations of the BTS3900A 4.1 Configuration Principle
4.2 Antenna Mode
4.3 Transmit Mode and Receive Mode
4.4 Typical Configuration
Page77Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Basic Configuration PrinciplesThe DRFU supports a maximum of two carriers and it is applicableto small- and middle-capacity scenarios;
The GRFU supports a maximum of six carriers and it is applicableto large-capacity scenarios.
The DRFU and GRFU can be configured in the same cabinet or cell to support flexible capacity expansion.
Wide coverage is preferred. The DRFU supports the PBT, TX diversity, and 4-way RX diversity mode. Therefore, the DRFU can be applied to wide-coverage scenarios.
Page78Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Antenna Configuration PrinciplesOne dual-polarized antenna can serve a maximum of two RFUs.
By default, RX diversity is adopted on the GSM network. That is,
two feeders connected to two single-polarized antennas or one
dual-polarized antenna must be configured in a cell.
Each sector of the BTS must be configured with the minimum
number of antennas.
For the 2-way RX diversity, each sector has two antenna channels;
for the 4-way RX diversity, each sector has four antenna channels.
Page79Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Configuration PrinciplesA single DRFU does not support the S1/1 application; however, three DRFUs support the S3/3 application
When the DRFU works in TX PBT, TX diversity, or 4-way RX diversity mode, a DRFU provides only one TRX.
When only DRFU are configured, One BTS3900A can support a maximum of 12 carriers in the maximum cell configuration of S4/4/4. A site configured with the BTS3900As can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12
Page80Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
4. Configurations of the BTS3900A 4.1 Configuration Principle
4.2 Antenna Mode
4.3 Transmit Mode and Receive Mode
4.4 Typical Configuration
Page81Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Antenna ModeSingle Feeder
Single Feeder (1TX + 1RX), for one DRFU configuration
Single Feeder (1TX + 2RX), for two DRFUs configuration
Double Feeder
Double Feeder (1TX + 1RX), for one DRFU configuration
Double Feeder (1TX + 2RX), for one DRFU configuration
Double Feeder (2TX + 2RX), for one DRFU configuration
Double Feeder (2TX + 4RX), for two DRFUs configuration
Page82Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Signal Feeder
Single Feeder (1TX + 1RX) Single Feeder (1TX + 2RX)
TX/RX TX/RXTX/RX
Page83Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Double Feeder
Double Feeder (1TX + 1RX) Double Feeder (1TX + 2RX)
TX RX TX/RX RX
Page84Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Double Feeder
Double Feeder (2TX + 2RX) Double Feeder (2TX + 4RX)
TX/RX TX/RX TX/RX TX/RXTX/RX TX/RX
Page85Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
4. Configurations of the BTS3900A 4.1 Configuration Principle
4.2 Antenna Mode
4.3 Transmit Mode and Receive Mode
4.4 Typical Configuration
Page86Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Transmit Mode and Receive Mode
DRFU transmit mode
Transmit independency or combining
PBT
Dynamic PBT
Diversity transmitter
DRFU receive mode
Main diversity receiver
Four diversity receiver
Page87Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Internal Structure2 TRXs and 2 duplexers are integrated in DRFU module which can be connected to antenna directly
The RX_IN and RX_OUT port of DRFU can support the receiving signal interconnection between 2 DRFUs, so that the 2 DRFUs can share different feeders
Interface Processing Unit
DUP
DUP
CPRI-0
CPRI-1
ANTA
ANTB
RX-IN
RX_OUT
Page88Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Transmit IndependencyIn transmit independency mode, TRX0 occupies channel A
while TRX1 occupies channel B
CPRI0
CPRI1
Interface Processing U
nit
ANT1
ANT2
DUP
DUP
Page89Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Transmit Combining In transmit combining mode,the two TRXs are combined
and transmitted through channel A
CPRI0
CPRI1
Interface Processing U
nit
ANT1
ANT2
DUP
DUP
Page90Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PBTIn PBT mode, only the TRX0 can work
PBT mode can improve the transmitting power
In PBT mode,only channel A is used by downlink signal
CPRI0
CPRI1
Interface Processing U
nit
ANT1
ANT2
DUP
DUP
Page91Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Dynamic PBTDynamic PBT is a mode based on the operation of timeslots, compared with static PBT, it brings the balance between capacityand coverage and does not cause the 50% decrease of capacity
The subscriber occupies a TS under the detection of measure report. When the quality is lower than a threshold, the same No. of TS of the adjacent TRX will be used as the secondary TS by the subscriber to start PBT. (The former subscriber in the secondaryTS will handover) When the quality is higher than a threshold, the PBT will be canceled and the secondary TS will be released
Page92Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
The Principle of Dynamic PBT
TimeslotsTimeslots TRXsTRXs
Good qualityGood quality
Poor qualityPoor quality
Signal qualitySignal quality
No signalNo signal
Page93Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Transmit DiversityIn Transmit diversity mode, only the TRX0 can work
Transmit diversity mode improves the quality of downlink signal
In Transmit diversity mode,the signal from the TRX0 is divided to 2 channels and be transmitted through ANTA and ANTB
CPRI0
CPRI1
Interface Processing U
nit
ANT1
ANT2
DUP
DUP
Page94Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
QuestionWhen configuring ‘Transmit Mode’, ‘Transmit Independency or Combining ’ can be chosen. How can we know whether ‘Transmit Independency’ or ‘Transmit Combining’ is used?
It will be decided by antenna mode. When 2 TRXs are used in one DRFU,
If the antenna mode is ‘Single antenna’ or ‘Double antenna(1TX)’, the transmit mode must be ‘Transmit Independency’
If the antenna mode is ‘Double antenna(2TX)’, the transmit mode must be ‘Transmit Combining’
Page95Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Main Diversity receiverIn this mode,both of the 2 TRXs can work
Each TRX receives the signal from 2 feeders
In the following figure,the TRX gets the receiving signal from channel A and B of the single DRFU
It is also possible for TRX to share the receiving channels with another DRFU
If only one ANT channel is used,
TRX can also use the ANT
channel of other DRFU through RX-in to ensure 2 way receiving
CPRI0
CPRI1
Interface Processing U
nit
ANT1
ANT2
DUP
DUP
RX-IN
RX_OUT
Page96Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Four Diversity ReceiverIn this mode, only the first TRX can work
The working TRXs get the uplink signals from 4 ANT ports of 2
DRFUsCable connection
for sharing the receiving signals
CPRI0
CPRI1
Interface Processing
Unit
ANT1
ANT2
DUP
DUP
RX-INRX_OUT
CPRI0
CPRI1
Interface Processing
Unit
ANT1
ANT2
DUP
DUP
RX-INRX_OUT
Page97Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Receiver Sensitivity of BTS3900A
Receive Mode Operating Frequency Band
Static Sensitivity (Typical Value)
900 MHz -113 dBm
1800 MHz -113 dBm
900 MHz -116 dBm
1800 MHz -116 dBm
900 MHz -118.5 dBm
1800 MHz -118.5 dBmFour-way receive
diversity
Two-way receive diversity
Receive independency
The following table lists the static receiver sensitivity of theBTS3900A
Page98Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
4. Configurations of the BTS3900A 4.1 Configuration Principle
4.2 Antenna Mode
4.3 Transmit Mode and Receive Mode
4.4 Typical Configuration
Page99Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU S1/S2 ConfigurationS1 Configuration
TX mode: Transmit Independency or Combining
RX mode: Main diversity receiver
Antenna mode: Double antenna(1TX+2RX)
S1 ConfigurationTX mode: Transmit diversity
RX mode: Main diversity receiver
Antenna mode: Double antenna(2TX+2RX)
S2 ConfigurationTX mode: Transmit Independency or Combining
RX mode: Main diversity receiver
Antenna mode: Double antenna(2TX+2RX)
Page100Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU S2/S3/S4 ConfigurationS2 Configuration
TX mode: PBT
RX mode: Main diversity receiver
Antenna mode: Single antenna(1TX+2RX)
S3/S4 Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode: Single antenna(1TX+2RX)
Page101Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU S5/S6 ConfigurationS5/S6 Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode
DRFU0: Single antenna(1TX+2RX)
DRFU1: Single antenna(1TX+2RX)
DRFU2: Double antenna(1TX+2RX)
Page102Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU S7/S8 ConfigurationS7/S8 Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode: Single antenna(1TX+2RX)
Page103Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU S3/3 ConfigurationS3/3 Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode
DRFU0: Single antenna(1TX+2RX)
DRFU1: Double antenna(2TX+4RX)
DRFU2: Single antenna(1TX+2RX)
Page104Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page105Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS Star TopologyThe star topology applies to common areas, especially densely
populated areas, such as cities
In the star topology, each site is directly connected to the BSC
Page106Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS Chain TopologyThe chain topology applies to sparsely populated areas in strip-
like terrain, such as areas along highways and railway tracks
The chain topology reduces cost in transmission equipment,
construction, and transmission link lease
Page107Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS Tree TopologyThe tree topology applies to areas where network structures, site distribution, and subscriber distribution are complicated
The tree topology requires fewer transmission cables compared with the star topology
Page108Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BTS Ring TopologyThe ring topology applies to common scenarios. Due to its strongself-healing capability, the ring topology is preferred if permitted by the routing
If there is a breaking point in the ring, the ring breaks into two chains at the breaking point automatically. In this way, the BTSs preceding and following the breaking point can work normally despite the breaking point; thus improving the robustness of the system
Page109Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU Topologies ConfigurationThe DRFU supports
various network
topologies: star, chain,
and ring
Page110Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. BTS3900A Overview
2. BTS3900A Hardware Components
3. BTS3900A Signal Flow
4. Configurations of the BTS3900A
5. BTS3900A Network
6. GRFU Introduction
Page111Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of GRFUGRFU is based on multi-carrier technology, one GRFU can support six TRXs at most.
GRFU performs modulation and demodulation between baseband signals and RF signals, processes data, and combines and divides signals.
The main new features and functions of GRFU
Inner Bias-Tee Integration of feeder current to TMA.
Provides power sharing. Improves the network coverage, reduces the interference and power consumption and save the device cost.
Page112Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Multi-carrier TechnologyThe principle of multi-carrier technology: multiple carriers share one power amplifier and one RF channel.
Baseband pool replaced independent baseband unit. Improve the integration.
Digital IF combination replaced Analog RF combination. There isn’t combination loss.
Single-carrier Technology Multi-carrier Technology
Page113Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Ports of GRFU
Port Type Label Connector Type Description
ANT_RXB
DIN connector
ANT_TX/RXA
DIN connector
CPRI0 SFP female connector
Connecting to the BBU, or the upper-level RFU during the cascading.
CPRI1 SFP female connector
Connecting to the lower-level RFU during the cascading.
RX_INBQMA female connector
Input port of diversity signals in the antenna channel.
RX_OUTA
QMA female connector
Output port of diversity signals in the antenna channel.
Power supply port PWR 3V3 power connector Feeding power.
Monitoring port MON RJ45 connector Monitoring port.
Interconnection port for RF receive signals
CPRI
Connecting to the antenna subsystem.Port for transceiving RF signals
Page114Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of GRFULED Color Status Description
ON The power input is normal, but the module is faulty.
OFF There is no power supply, or the module is faulty.
1s ON1s OFF The module is running properly.
0.2s ON 0.2s OFF
The software is being loaded to the module.
1s ON1s OFF A fault alarm is generated.
OFF No alarm is generated.
ON The module is functional and is correctly connected to the BBU.
OFF The connection with the BBU is not set up.
OFF No VSWR alarm is generated.
ON The VSWR alarm is generated on the ANT_TX/RX port.
VSWR Red
ACT Green
ALM Red
RUN Green
Page115Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
LEDs of GRFU
ON (Green) The CPRI link is normal.
ON (Red) The interface module fails to receive signals.
1s ON 1s OFF(Red) The CPRI link is out of lock.
ON (Green) The CPRI link is normal.
ON (Red) The interface module fails to receive signals.
1s ON,1s OFF (Red) The CPRI link is out of lock.
CPRI1
RedGreen
CPRI0
RedGreen
Page116Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Compare GRFU with DRFU
Port Type GRFU Relative position DRFU Relative
positionANT_TX/RXA lower
upper
lowerupper
upper
lower
existence
ANT_RXB
upperANT1
ANT2
CPRI0CPRI1
Rx_1 in
Rx_1 out
Rx_2 in
CPRI0
Rx_2 out
lower
upperlowerCPRI1
RX_INB
RX_OUTA
Non
existenceMON
Port for
transceiving
RF signals
CPRI
Interconnectio
n
port for RF
Receive
signals
Monitoring
port
Page117Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Output power of GRFUThe output power of different configuration is also configured
differently
Frequency bands ConfigurationOutput power(GMSK/8PSK
)S1 80W/53W
S3 31W/20W
S4 27W/17W
S6
S2 40W/26W
S5 18W/12W
PGSM 900MHz / GSM1800MHz
16W/10W
Page118Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Limitation of GRFUIf the frequency interval of a cell is outside the range of 15MHz, 2 GRFUs can be considered to be used and the range of frequency for each GRFU also should be within15MHz.
Generally, it is suggested that the number of carriers should be set to 2 GRFUsaveragely if 2 GRFUs are used in a cell. For example: S8 should be configured as 4+4 when 2 GRFU are used.
GRFU supports whole frequency band of PGSM 900MHz, high 45MHz frequency band and low 45MHz frequency band of DCS1800MHz.
GRFU DL UL
Whole 25MHz frequency band of 900MHz 935-960MHz 890-915MHz
Low 45MHz of 1800MHz 1805-1850MHz 1710-1755MHz
High 45MHz of 1800MHz 1835-1880MHz 1740-1785MHz
Page119Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Configuration Principle of GRFU The DRFU and GRFU can be configured in the same cabinet.
When the GRFU is configured, a single BTS3900A provides a maximumof 36 carriers with the maximum cell configuration of S12/12/12. In addition, a site configured with the BTS3900As cansupport a maximum of 72 carriers, with the maximum cell configuration of S24/24/24.
One GRFU does not serve two cells.
Each cell with a single antenna can be configured with a maximum of two GRFUs.
Page120Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Transmit Mode and Receive Mode of GRFU
GRFU Transmit Mode
Transmit independency or combining
GRFU Receive Mode
Main diversity receiver
Page121Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GRFU S2-S6 ConfigurationS2-S6 Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode: Double antenna(1TX+2RX)
Page122Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GRFU S7-S12 ConfigurationS7-S12 Configuration
TX mode: Transmit Independency
or Combining
RX mode: Main diversity receiver
Antenna mode:
Single antenna(1TX+2RX)
Page123Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU&GRFU ConfigurationDRFU&GRFU Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode:
GRFU: Single antenna(1TX+2RX)
DRFU: Single antenna(1TX+2RX)
Page124Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRFU&GRFU ConfigurationDRFU&GRFU Configuration
TX mode: Transmit Independency or
Combining
RX mode: Main diversity receiver
Antenna mode:
GRFU: Double antenna(1TX+2RX)
DRFU: Double antenna(1TX+2RX)
Page125Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
SummaryBTS3900A functions and features
BTS3900A hardware structure, including RF cabinet, APM30
and components
Working mode, configuration principles, RF cable
configurations, typical configurations
BTS networking topology and RFU connection