huawei bts3900a hardware structure and principle 200903 issue1 0 b
TRANSCRIPT
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Security Level: Internal
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www.huawei.com
2009-03
Wireless Case and Training
HUAWEI BTS3900A
Hardware Structure and Principle
ISSUE 1.0
HUAWEI TECHNOLOGIES CO., LTD. Page 2Huawei Confidential
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BTS3900A Base Station is the fourth generation
base station developed by Huawei. It features a
multi-mode modular design and supports three
working modes: GSM mode, GSM+UMTS dual
mode, and UMTS mode through configuration of
different software. In addition, the BTS3900
supports smooth evolution to the Long-Term
Evolution (LTE). This course mainly introduce the
hardware structure and system principle of
BTS3900A.
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Know the functions and features of BTS3900A
Master the hardware structure and function of BTS3900A
Master the typical configuration and RF Cable Connections
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BTS3900A Hardware Description(V100R001_01)
BTS3900A Installation Guide(V100R001_01)
HUAWEI BTS3900&BTS3900A MRFU Deployment Guide
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Chapter 1 BTS3900A Product DescriptionChapter 1 BTS3900A Product Description
Chapter 2 BTS3900A System Structure
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Location
PSTN ISDN
PSPDN
Um Interface
BTS3900A
BTS3900A
BTS3900A
BTS3900A
OMC
HLR/AUC/EIR
BSC/RNC
MSC/VLR
SMC/VM
A/Iu Interface
MAP
MAP
TUP,ISUPMS
MS
MS
MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller
HLR: Home Location Register AUC: Authentication Center RNC: Radio Network Controller
MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center
VM: Voice Mailbox EIR: Equipment Identity Register OMC: Operation and Maintenance Center
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BTS3900A Product Description BTS3900A is a compact outdoor base
station. It is designed in stack mode.
The BTS3900A cabinet consists of an
RF cabinet and an APM30 power
cabinet. The extension APM30 battery
cabinet and APM30 transmission cabinet
are optional.
The basic module BBU3900 is installed
in APM30 power cabinet. MRFU is
installed in RF cabinet.
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Features of BTS3900A Advanced Platform-Based Architecture
Based on the unified hardware platform, the BTS3900 supports three working modes: GSM
mode, GSM+UMTS dual mode, and UMTS mode through configuration of different
software.
In addition, the BTS3900 supports smooth evolution to the Long-Term Evolution (LTE).
Supports whole frequency band of PGSM 900MHz, high 45MHz frequency band and low
45MHz frequency band of DCS1800MHz, high 40MHz frequency band and low 40MHz
frequency band of 1900MHz.
High Capacity
When the BTS3900A works in GSM mode, a BBU3900 supports the maximum cell
configuration of S24/24/24, one cabinet supports the maximum cell configuration of
S12/12/12.
When the BTS3900 works in GSM+UMTS dual mode, a BBU3900 supports the maximum
cell configuration of GSM S4/4/4 + UMTS S2/2/2 or GSM S5/5/5 + UMTS S1/1/1.
When the BTS3900 works in UMTS mode, a BBU3900 supports 24 cells, 1,536 CEs in the
uplink, 1,536 CEs in the downlink, and the maximum configuration of 3 x 8.
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Features of BTS3900A Transmission Sharing
Sharing the CPRI port. The CPRI data of the GSM and UMTS networks can be multiplexed
on the same optical cable, which reduces the quantity of CPRI ports.
Supports co-transmission between the GSM and the UMTS. Sharing transmission
resources between the Abis and the Iub interfaces.
Flexible Clock Synchronization Modes
Upper synchronization clock, extract clock from Abis/Iub interface.
Extract clock from GPS (Global Positioning System).
Synchronization with the IP clock, a highly cost-effective clock solution, which can be
obtained through software upgrade without additional hardware.
Clock phase lock, tracing, and memory functions and free-run synchronization mode. When
the clock operates in free-run mode, the system can keep operational for at least 90 days at
normal temperature.
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Features of BTS3900A Networking Capability
The BTS3900 supports multiple network topologies, such as star, tree, chain, and ring
topologies.
When working in UMTS mode, the BTS3900 supports ATM and IP dual stack to protect
operators' early investment in ATM transport.
Supports optimized transmission on the Abis interface.
Low Power Consumption
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ArialChapter 1 BTS3900A Product Description
Chapter 2 BTS3900A System StructureChapter 2 BTS3900A System Structure
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AbbreviationAbbreviation Description
GTMU Transmission& Timing& Management Unit for BBU
WMPT WCDMA Main Processing and Transmission Unit
WBBPa WCDMA Baseband Process unit Type A
UTRP Universal Transmission Processing Unit
UPEAUniversal power and Environment interface unitType 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
SLPU Signal Lightning Protection Unit
DCDU-02 Direction Current Distribution Unit
GATM GSM Antenna and TMA control Module
APMI APM Power Monitor unit Interface Board
AFMU APM Fan Monitor unit Interface Board
APM Advanced Power Module
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Sector 1 Typical Configuration of BTS3900A CabinetSector 1 Typical Configuration of BTS3900A Cabinet
Sector 2 Components of the Power Cabinet
Sector 3 Components of the RF Cabinet
Sector 4 Components of the APM30 Transmission Cabinet
Sector 5 Working Mode of MRFU
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Appearance of the BTS3900A Cabinet The BTS3900A cabinet is designed in compliance
with the IEC297 standard. It is a white vertical
cabinet.
The BTS3900A cabinet consists of an RF cabinet
and an APM30 power cabinet. The extension
APM30 battery cabinet and APM30 transmission
cabinet are optional.
Configuration TypeHeight
(mm)Width (mm) Depth (mm)
RF cabinet 700 600 480
Power cabinet 700 600 480
Configuration Type Weight
Empty RF cabinet ≤ 55kg
Empty power cabinet ≤ 65kg
Cabinet ( 3×1or 3×2 ) ≤ 165 kg
Full configuration cabinet≤ 210 kg ( no battery
)
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Typical Configuration of BTS3900A Cabinet Typical configuration of the BTS3900A cabinet:
RF cabinet and APM30 power cabinet without backup
power;
RF cabinet and APM30 power cabinet with 24Ah backup
power;
RF cabinet, APM30 power cabinet and APM30 battery
cabinet with 50Ah/92Ah/184Ah backup power;
RF cabinet, APM30 power cabinet, APM30 battery
cabinet and APM30 transmission cabinet.
1 、 APM30 power cabinet
2 、 RF cabinet
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Typical Configuration of BTS3900A Cabinet Typical configuration of the BTS3900A cabinet:
RF cabinet and APM30 power cabinet without backup
power;
RF cabinet and APM30 power cabinet with 24Ah
backup power;
RF cabinet, APM30 power cabinet and APM30
battery cabinet with 50Ah/92Ah/184Ah backup power;
RF cabinet, APM30 power cabinet, APM30 battery
cabinet and APM30 transmission cabinet.
1 、 APM30 power cabinet
2 、 RF cabinet
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Typical Configuration of BTS3900A Cabinet Typical configuration of the BTS3900A
cabinet:
RF cabinet and APM30 power cabinet without
backup power;
RF cabinet and APM30 power cabinet with
24Ah backup power;
RF cabinet, APM30 power cabinet and APM30
battery cabinet with 50Ah/92Ah/184Ah backup
power;
RF cabinet, APM30 power cabinet, APM30
battery cabinet and APM30 transmission
cabinet.
1 、 APM30 power cabinet 2 、 RF cabinet
3 、 APM30 battery cabinet
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Typical Configuration of BTS3900A Cabinet Typical configuration of the BTS3900A
cabinet:
RF cabinet and APM30 power cabinet without
backup power;
RF cabinet and APM30 power cabinet with
24Ah backup power;
RF cabinet, APM30 power cabinet and APM30
battery cabinet with 50Ah/92Ah/184Ah backup
power;
RF cabinet, APM30 power cabinet, APM30
battery cabinet and APM30 transmission
cabinet.
1 、 APM30 power cabinet 2 、 RF cabinet
3 、 APM transmission cabinet
4 、 APM battery cabinet
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Sector 1 Typical Configuration of BTS3900A Cabinet
Sector 2 Components of the Power CabinetSector 2 Components of the Power Cabinet
Sector 3 Components of the RF Cabinet
Sector 4 Components of the APM30 Transmission Cabinet
Sector 5 Working Mode of MRFU
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Components of the Power CabinetBoards and Module of the BBU3900
APMI
AFMU
PDU
SLPU
GATM
Power Subrack (AC/DC)
Batteries in the APM30 Power Cabinet
Heater
Sensors
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Boards and Module of the BBU3900 The BBU3900, which features a case structure, can be installed in a 19-inch-wide
and 2U-high indoor space or outdoor protective cabinet.
BBU3900 equipment includes:
GTMU (Transmission& Timing& Management Unit )
WMPT ( WCDMA Main Processing and Transmission Unit )
WBBP ( WCDMA Baseband Process unit ) UTRP ( Universal Transmission Processing Unit)
UPEU ( Universal Power and Environment Interface Unit ) UEIU ( Universal Environment Interface unit ) UELP ( Universal E1/T1 Lighting Protection unit ) UFLP ( Universal FE/GE Lighting Protection unit ) UBFA ( Universal BBU Fan Unit Type A )
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Functions of the BBU3900
As the baseband processing unit, the BBU3900 provides ports for connection
between the dual mode base station and the BSC/RNC and between the
BBU3900 and the RF modules.
The BBU3900 has the following functions:
Provides ports for communication between the base station and the BSC/RNC.
Provides CPRI ports for communication between the BBU and the RF modules.
Provides USB ports, facilitating the automatic software upgrade of the dual-mode base
station when a USB disk is inserted during software installation and data configuration.
Provides an OM channel between the base station and the LMT or the M2000 to operate
and maintain the base station.
Processes uplink and downlink data.
Manages the entire dual-mode system in terms of OM and signaling processing.
Provides the system clock.
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Logical Structure of the BBU3900
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BBU3900 Slots The slots of the BBU3900 GSM, BBU3900 GU, and BBU3900 UMTS are the same.
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Board configuration principles of the BBU3900 GSM
BBU3900 GSM board includes: GTMU, UBFA, UPEU, UEIU, UELP.
Board
Name
Optional/
Mandatory
Maximum
Number
Slot Configuration Limitations
GTMU Mandatory 1 Slot 5 and Slot 6 Only configured in slot 5 and slot 6
UBFA Mandatory 1 UBFA Only configured in the FAN slot
UPEU Mandatory 2 PWR1 or PWR2 Preferentially configured at the PWR2
slot in the case of a single UPEU
UEIU Mandatory 1 PWR1 ——
UELP Mandatory 2 Slot 0 or Slot 4 In the case of less than or equal to four E1s, one UELP is
required and installed in slot 0. In the case of more than four but
less than or equal to eight E1s, two UELPs are required and
installed in slot 0 and slot 4. In the case of more than eight E1s,
the SLPU is required and the UELPs are installed in the SLPU.
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Board configuration principles of the BBU3900 UMTS BBU3900 UMTS board includes:
WMPT 、 WBBP 、 UBFA 、 UPEU 、 UEIU 、 UELP UFLP 、 UTRP.Board Name
Optional/
Mandatory
Maximum
Number
SlotConfiguration Limitations
WMPT Mandatory 2 Slot 6 or Slot 7 Preferentially configured in slot 7 in the case of a single WMPT
WBBP Mandatory 4 Slot 0 - Slot 3Preferentially configured in slot 3 ,slot 0 and slot 1 in the case of the WBB
P that transmits CPRI signals,slot 2 is reserved.
UBFA Mandatory 1 FAN Only configured in the FAN slot
UPEU Mandatory 2 PWR1 or PWR2 Preferentially configured in the PWR2 slot in the case of a single UPEU
UEIU Optional 1 PWR1 -
UELP Optional 2 Slot 0 or slot 4
In the case of less than or equal to four E1s, one UELP is required and
installed in slot 4. In the case of more than four but less than or equal to
eight E1s, two UELPs are required and installed in slot 0 and slot 4. In the
case of more than eight E1s, the SLPU is required and the UELPs are
installed in the SLPU.
UFLP Optional 2 Slot 0 or slot 4 Preferentially configured in slot 4
UTRP Optional 6 Slot 0 - Slot 5 ——
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Board configuration principles of the BBU3900 GU
Board
Name
Optional/
Mandatory
Maximum
Number
SlotConfiguration Limitations
WMPT Mandatory 1 Slot 7 Preferentially configured in slot 7 in the case of a single WMPT
GTMU Mandatory 1 Slot 5 and slot 6 Only configuredin slot 5 and slot6
WBBP Mandatory 4 Slot 0 - Slot 3Only configured in slot 2 and slot 3 in the case of the WBBP that transmits C
PRI Signals
UBFA Mandatory 1 FAN Only configured in the FAN slot
UPEU Mandatory 2 PWR1 o PWR2 Preferentially configured in the PWR2 slot in the case of a single UPEU
UEIU Optional 1 PWR1 -
UELP Optional 2 Slot 0 or slot 4
In the case of less than or equal to four E1s, one UELP is required and
installed in slot 4. In the case of more than four but less than or equal to
eight E1s, two UELPs are required and installed in slot 0 and slot 4. In the
case of more than eight E1s, the SLPU is required and the UELPs are
installed in the SLPU.
UFLP Optional 2 Slot 0 or slot 4 Preferentially configured in slot 4
UTRP Optional 4 Slot 0 - Slot 4 ——
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BBU Hardware – GTMU Board The GSM Transmission, Timing, and Management Unit for BBU (GTMU) controls
and manages the entire BTS in GSM mode. It provides interfaces related to the
reference clock, power monitoring, OM, and external alarm collection. Functions:
Controlling, maintaining, and operating the BTS. Providing fault management, configuration
management, performance management, and security management.
Monitoring the fan module and the power supply module.
Providing four routes of E1 transmission.
Providing CPRI ports for the communication with the RF modules.
Distributing and managing BTS clock signals.
Providing the Ethernet port for local maintenance.
Providing clock output for testing.
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BBU Hardware – GTMU Board Ports on the GTMU panel:
Board Port Connector Type Description
GTMU
CPRI0 ~CPRI5
SPF
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 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 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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BBU Hardware – GTMU Board LEDs on the GTMU:
LED Color Status Description
RUN Green
ON The board is faulty.
OFF No power supply is available or the board is faulty.
ON for 1s and OFF for 1s The board is operational.
ON for 2s and OFF for 2s The OML link is abnormal.
ON for 0.125s and OFF for 0.125s The board is loading software.
ALM RedON A fault occurs in the running board.
OFF No alarm is generated.
ACT GreenON The board is operational.
OFF The board is faulty.
LIU0~LIU3 Green
ON This link is not used.
ON for 0.125s and OFF for 0.125s A remote E1/T1 alarm is generated.
OFF This link is operational.
CPRI0~CPRI5
Green ON The CPRI link is normal.
Red ONThe reception of the optical module is abnormal and an
alarm is generated.
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BBU Hardware – GTMU Board DIP Switches:
DIP SwitchDIP Status
Description1 2
SW1
ON ON The E1 impedance is set to 75 ohms.
OFF ON The E1 impedance is set to 120 ohms.
ON OFF The T1 impedance is set to 100 ohms.
DIP SwitchDIP Status
Description1 2 3 4
SW2
ON ON ON ON
When four 75- ohm E1 links are faulty, all the
DIP bits of S2 should be set to ON
(unbalanced mode) so that the Faults are rectified.
OFF OFF OFF OFFAll the DIP bits of S2 are set to OFF (balanced
mode) by default in all modes.
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BBU Hardware – GTMU Board DIP Switches:
DIP Switch
DIP Status
Description1 2 3 4
SW4
ON ON ON ON The E1 link can be bypassed.
OFF OFF OFF OFF The E1 link cannot be bypassed.
DIP SwitchDIP Status
Description1 2 3 4
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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BBU Hardware – WMPT Board This describes the WCDMA Main Processing and Transmission unit (WMPT). It
is the BBU3900 main control and transmission board that processes the signals
and manages the resources for other boards. The WMPT has the following functions:
Providing Operation and Maintenance (OM) functions such as configuration management,
equipment management, performance monitoring, signaling processing, and active/standby
switchover and providing OM channels connected to the OMC (LMT or M2000).
Providing the reference clock.
Processing signaling and managing resources for other boards in the BBU.
Providing USB ports, one of which facilitates automatic base station upgraded when a USB
disk is inserted during software installation and data configuration.
Providing four E1s/T1s which support ATM and IP protocols.
Providing one FE electrical port and one FE optical port which support the IP protocol.
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BBU Hardware – WMPT Board Ports on the WMPT:
Board Port Connector Type Description
WMPT
E1/T1 DB26 connector E1
FE0 RJ45 connector FE electrical port
FE1 SFP connectorFE optical port
GPS SMA connector GPS antenna
ETH RJ45 connector Commissioning Ethernet port
USB USB connector USB loading port
TESTUSB connector
USB testing port
RST — Resetting the BBU
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BBU Hardware – WMPT Board LEDs on the WMPT:
LED Color Status Description
RUN
Green
ONThe power input is available, but the board is
faulty.
OFF The power supply is available.
1s ON and 1s OFFThe board in normal configuration is running
properly.
0.125s ON and 0.125s
OFF
The software is being loaded to the board, or the
board is not in use.
ALM RedON The board has alarms on hardware.
OFF No alarm is generated.
ACT GreenON The board is in active mode.
OFF The board is in standby mode.
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BBU Hardware – WMPT Board LEDs beside the three ports:
LED Color Status Description
LEDs beside the FE1
optical port
Green (LINK)ON The connections are functional.
OFF The connections are faulty.
Green (ACK)Blinking Data transmission is ongoing.
OFF No data transmission is ongoing.
LEDs beside the FE0
electrical port
Green (LINK)ON The connections are functional.
OFF The connections are faulty.
Yellow (ACK)Blinking Data transmission is ongoing.
OFF No data transmission is ongoing.
ETHGreen (LINK)
ON The connections are functional.
OFF The connections are faulty.
Yellow (ACK) Blinking Data transmission is ongoing.
OFF No data transmission is ongoing.
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BBU Hardware – WMPT Board DIP switches on the WMPT:
DIP switch DIP Bit T1 Mode 120-ohm E1 Mode 75-ohm E1 Mode
SW1
1 ON OFF ON
2 ON OFF ON
3 OFF ON ON
4 OFF ON ON
DIP switch DIP Bit Balanced Mode Unbalanced Mode
SW2
1 OFF ON
2 OFF ON
3 OFF ON
4 OFF ON
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BBU Hardware – WBBP Board This describes the WCDMA Baseband Process Unit (WBBP) board. It is a
mandatory board of the BBU3900 that processes baseband signals. The WBBP has the following functions :
Provides the CPRI ports for communication between the BBU and the RFU, and supporting
CPRI ports in 1+1 backup mode.
Processes uplink and downlink baseband signals.
There’re two types of WBBP board: WBBPa and WBBPb.
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BBU Hardware – WBBP Board Specifications of the WBBPs:
Board Number of Cells Number of UL CEs Number of DL CEs
WBBPa 3 128 256
WBBPb1 3 64 64
WBBPb2 3 128 128
WBBPb3 6 256 256
WBBPb4 6 384 384
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BBU Hardware – WBBP Board LEDs on the panel of the WBBP:
LED Color Status Description
RUNGreen
ON There is power supply, but the board is faulty.
OFF There is no power supply, or the board is faulty.
ON for 1s and OFF for 1s The board is running properly.
ON for 0.125s and OFF for 0.125s The board is loading software.
ALM RedON The board has a hardware alarm.
OFF The board is normal.
ACT GreenON The board is running.
OFF The board is not in use.
CPRI0/
CPRI1/
CPRI2
Red/
Green
OFF The optical module is not configured, or it is powered off.
ON (green) The CPRI link is normal, and the RFU has no hardware faulty.
ON (red) The optical module is not in position, or the CPRI link is faulty.
ON for 0.125s and OFF for
0.125s (red)
The RFU on the CPRI link has a hardware fault, and the RFU
needs to be replaced.
ON for 1s and OFF for 1s (red)
The RFU on the CPRI link has a VSWR alarm, antenna
alarm, or
external alarm.
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BBU Hardware – UPEU Board This describes the Universal Power and Environment Interface Unit (UPEU)
board. It is a mandatory board of the BBU3900 that converts -48 V or +24 V DC to
+12 V DC.
The UPEU has the following functions: Converting -48 V or +24 V DC to +12 V DC that is applicable to the boards.
Providing two ports with each transmitting one RS485 signal and another two ports with
each transmitting four dry contact signals.
Providing reverse connection protection for power cable connectors.
The UPEU is classified into the Universal Power and Environment Interface Unit
Type A (UPEA) and the Universal Power and Environment Interface Unit Type B
(UPEB). The UPEA converts -48 V DC to +12 V DC and the UPEB converts 24 V DC
to 12 V DC.
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BBU Hardware – UEIU Board This describes the Universal Environment Interface Unit (UEIU) board of the
BBU3900. The UEIU transmits monitoring signals and alarm signals from external
devices to the main control board.
Ports on the UEIU:
Port 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
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BBU Hardware – UELP Board The Universal E1/T1 Lightning Protection (UELP) is a universal E1/T1 surge
protection unit. The UELP is optionally installed in the SLPU or BBU. Each
UELP provides surge protection for four E1s/T1s.
Port Connector Type Description
INSIDE DB25 E1 transfer transmission port
OUTSIDE DB26 E1 transmission port
The UELP has one DIP switch, which is used to select whether the receive terminal is grounded.
DIP Switch DIP Status Description
1 2 3 4
S1 ON ON ON ON 75-ohm E1 cable
OFF OFF OFF OFF 120-ohm E1 cable or 100-ohm T1 cable
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BBU Hardware – UFLP Board The universal FE lightning protection (UFLP) board is optionally installed in
the SLPU or BBU3900. Each UFLP supports 2-way FE surge protection.
Port Location Port Quantity Connector Type
INSIDE FE0 、 FE1 2 RJ45
OUTSIDE FE0 、 FE1 2 RJ45
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BBU Hardware – UTRP Board This describes the Universal Transmission Processing unit (UTRP) board. It is a
transmission extension board of the BBU3900 and provides eight E1s/T1s and
one unchannelized STM-1/OC-3.
The UTRP has the following functions:
Providing extension Iub transmission ports which support eight E1s/T1s and one
unchannelized STM-1/OC-3.
Supporting ATM and IP transport.
Supporting cold backup.
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BBU Hardware – UTRP Board
The panel of the UTRP configured with the UAEU or UIEU is different
from that of the UTRP configured with the UUAS.
The UTRP can be configured with different sub-boards to support different ports.
Sub-Board Port
UAEU ( Universal ATM over E1/T1 Interface and Processing Unit ) Ports for eight ATM over E1s/T1s
UIEU ( Universal IP Packet over E1/T1 Interface and Processing Unit) Ports for eight IP over E1s/T1s
UUAS ( Universal Unchannelized ATM over SDH/SONET Card ) Port for one unchannelized STM-1/OC-3
Panel of the UTRP (with eight E1s/T1s)
Panel of the UTRP (with one STM-1)
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BBU Hardware – UTRP Board LEDs on the UTRP:
LED Color Status Description
RUNGreen
ONThe board has power input, yet the board is
faulty.
OFF The power supply or the board is faulty.
1s ON, 1s OFF The board is running properly.
0.125s ON, 0.125s OFF Software is being loaded to the board.
2s ON, 2s OFF The board is under test.
ALM RedON The board is reporting alarms and is faulty.
OFF The board is running properly.
ACT GreenON The board is in active mode.
OFF The board is in standby mode.
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BBU Hardware – UTRP Board The UTRP has three DIP switches: SW1 and SW2 for setting the protection
grounding for the RX end of the E1 cable and SW3 for selecting the
impedance mode for the E1 signal cable.
DIP Switch DIP BitBalanced Mode
Unbalanced Mode
SW1
1 OFF ON
2 OFF ON
3 OFF ON
4 OFF ON
DIP Switch DIP BitBalanced Mode
Unbalanced Mode
SW2
1 OFF ON
2 OFF ON
3 OFF ON
4 OFF ON
DIP Switch DIP Bit75-Ohm E1
Mode
120-Ohm E1
ModeT1 Mode
SW3
1 ON ON OFF
2 ON ON OFF
3 ON OFF ON
4 ON OFF ON
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BBU Hardware – UBFA Module This describes the Universal BBU Fan Unit Type A (UBFA) module of the
BBU3900. The UBFA controls the fan speed and detects the temperature of
the fan board.
LED Color Status Description
STATE
Green
0.125s ON, 0.125s OFF
The module is not
registered, and no
alarm is reported.
1s ON, 1s OFFThe module is
running properly.
Red OFF No alarm is reported.
1s ON, 1s OFFThe module is
reporting alarms.
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BBU Cable Connection This describes the BBU3900
cables. The BBU3900
cables are the BBU PGND
cable, BBU power cable, E1
cable, E1 surge protection
transfer cable, CPRI optical
cable, inter-CPRI signal
cable, BBU alarm cable,
monitoring signal cable
between the APMI and the
BBU, FE cable, FE surge
protection transfer cable,
monitoring signal cable for
the EMUA, and GPS clock
signal cable.
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BBU3900 Cable
BBU3900 Cable List:
Power Cable E1 Surge Protection Transfer Cable
FE Cable CPRI Optical Cable
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BBU Cable BBU3900 Cable List:
(1) RJ45
connector
(2) cold-pressed
terminal
Monitoring Signal Cable Between the OFB and the BBU
Monitoring Signal Cable Between the APMI and the BBU
(1) RJ45
connector
(2) cold-pressed
terminal
(3) ring terminal (4) 3PIN connector
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APMI The APMI board refers to APM Power Monitor unit Interface board and it is located at
the upper left corner of the APM30 cabinet.
The APMI board performs the following functions:
Transfers the APM30 serial port communications signals, Boolean input/output signals, and EMI
signals.
Protects the dry contact input/output signals and RS485 signals (connected to the UPEU of the
BBU).
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APMIExternal Ports on the APMI board:
Port Connector Type Quantity Function
RS422 RJ45 connector 1Connecting the monitoring signal cable between the
PMU and the APMI
TX+ 、 TX- 、RX+ 、 RX-
2-pin molex connector 2Connecting to the MON1 port on the UPEU board of
the BBU, transferring RS485 signals
IN1-IN3 2-pin molex connector 3 Connecting the dry contact alarm input cable
OUT-、 OUT+
2-pin molex connector 1
Connecting the optical coupling alarm output cable
(connecting the monitoring signal cable when the
APMI is used in the transmission cabinet)
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AFMU The AFMU board refers to APM Fan Monitor Unit interface board. It is located at the
upper right corner of the APM30 cabinet.
The AFMU board performs the following functions:
Provides 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.
The alarm signal of the AFMU board is transport.
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AFMUExternal ports and LEDs on the AFMU board:
LEDSilk
screenColor Status Description
Operation
LEDRUN Green
ON steady About 1 minute after the AC or DC power is on
Blinking (1s ON and 1s OFF) The system is working properly.
Blinking (0.125s ON and
0.125s OFF)
The communications on the serial port are
disrupted, while the others are normal.
OFF steady The system is not powered on, or the AFMU is damaged.
Alarm
LEDALM Red
ON steady Alarms are generated.
OFF steadyNo alarm is generated, or the system is not
powered on.
SN 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
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PDU The power distribution unit (PDU) performs AC and DC power distribution. It can be
classified into four types according to different AC input voltages and DC loads of the PDU.
The AC distribution functions of the PDU are as follows:
Supplying two AC outputs with the maximum current of 10 A to the heaters of the power cabinet and the
heating film of the battery cabinet.
Reporting the surge protection alarms of the AC input.
The DC distribution functions of the PDU are as follows:
Providing 10 DC outputs to meet the DC power requirements of the distributed base station or the
separated base station.
Reporting the surge protection alarms of the DC output.
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PDUPorts on the PDU:
SN Description
1
AC wiring terminals•In the case of the dual-live 110 V AC input, use L2.•In the case of the single-phase 220 V/three-phase 220 V AC input, use N1 and N2.
2
AC wiring terminals•In the case of the dual-live 110 V AC input, use L1.
In the case of the single-phase 220 V/three-phase 220 V AC input,
use L1, L2, and L3.
3 AC output wiring terminals (Lout1 and Lout2)
4 AC output wiring terminals (Nout1 and Nout2)
5 AC input MCB
6AC output MCB (controlling the power supply to the heating film or heaters)
7 DC output MCBs (SW0-SW9)
8 DC output wiring terminals (LOAD0-LOAD9)
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SLPU The Signal Lightning Protection Unit (SLPU) or SLPU-01 provides signal surge
protection. It can be configured with the UELP, UFLP, or USLP. The SLPU is
optionally installed in the APM30 power cabinet.
The SLPU-01 provides signal surge protection. It can be configured with a
maximum of four USLPs.
The Universal Signal Lightning Protection (USLP) board is an universal E1/T1
surge protection unit, which is optionally.
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GATM The GSM antenna and TMA control module (GATM) is a module that controls the
antenna and TMA. The GATM is optional. The GATM is optionally installed in the
power cabinet or transmission cabinet when the DRFU module is configured.
The GATM has the following functions:
Controlling the RET antenna.
Supplying power to the TMA.
Reporting the RET control alarm signals.
Monitoring the current from the feeder.
Not support common TMA and RET antenna at the same time.
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GATMPorts on the GATM:
Port Connector Function
ANT0 ~ANT5
SMA female connector
Providing power for the RET antenna and
transmitting control signals for the RET
antenna
COM1 RJ45 connector Connecting to the BBU
COM2 RJ45 connectorProviding the extended RS485 port to be
cascaded with other devices
-48V3W3 power connector
Receiving the -48 V power input
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GATMLEDs on the GATM panel:
LED Color Function Status Description
RUN GreenIndicator of the
board Running
status
On for 2s and off for 2sThe power supply is normal but the
communication with the BBU is abnormal.
On for 1s and off for 1sThe board is running normally and the
communication with the BBU is normal.
OffNo power input is available, or
the module is faulty.
ACT Green
Indicator of the
Service running
status
On The AISG link is normal.
Off The AISG link is abnormal.
Blinking frequently and
irregularlyThe AISG link is transmitting data.
ALM Red Alarm indicatorOn
An alarm is generated, such as
an over current alarm.
Off The module runs normally.
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Power Subrack (AC/DC) The power subrack (AC/DC) converts the 220 V AC power to the -48V DC power.
The power subrack (AC/DC) consists of the PMU, PSU (AC/DC) and the wiring
unit of the power subrack (220 V).
The Power and Environment Monitoring Unit (PMU).
The power supply unit (PSU).
The wiring unit of the power subrack (220 V).
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Power Subrack (AC/DC)--PMU The Power and Environment Monitoring Unit (PMU) provides a comprehensive
function of power supply management, power distribution check, and alarm
reporting.
The PMU performs the following functions:
Communicating with the main control unit through the RS232/RS422 serial port.
Providing comprehensive functions of power system management and battery charge and
discharge management.
Detecting and reporting water damage alarms, smoke alarms, door status alarms, and
standby Boolean value alarms, and reporting ambient humidity and temperature, battery
temperature, and standby analog values.
Detecting power distribution, reporting related alarms, and reporting dry contact alarms
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Power Subrack (AC/DC) -- PMU Ports on the PMU:
Ports on the front panel of the PMU
Backplane of the PMU
No. Port Function
1 RS232/RS422 port Used for communication with the main control unit
3Power test port Used for measuring power voltages by using an ordinary
multimeter through -48 V and 0 V power test holes.
4 TEST port Used for testing
5 Battery control switch
Used for powering on and off the batteries through the ON
and OFF control ports.
Press and hold the port ON for 5s to 10s until the battery
is powered on.
Press and hold the port OFF for 5s to 10s until the
battery is powered off.
NOTE
You need to insert a small round bar into the hole when
you operate the battery
6 COM port Used for connecting to the external signal transfer board
7 Backplane port Used for connecting to the backplane
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Power Subrack (AC/DC) -- PMU LEDs on the panel of the PMU:
No
.Label Color Status Description
2
RUNGreen
Blinking (ON for 1s and
OFF for 1s)
The PMU is functional, and the communication
with the main control unit is normal.
Blinking (ON for
0.125s and OFF for
0.125s)
The PMU is functional, but the communication
with the main control unit fails. If the PMU does
ot communicate with the main control unit for
one minute, the communication fails.
ON or OFFThe PMU is faulty (not in the power-on
self-check state).
ALM RedON
The base station reports at least one of the
following alarms:
Mains over-voltage or under-voltage alarm
Busbar overvoltage or undervoltage alarm
Power module alarm
Load shutdown alarm
OFF No alarm is reported.
NOTE: In 3s to 5s after the PMU is powered on, the ALM and RUN LEDs are simultaneously ON for about 3s.
Ports on the front panel of the PMU
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Power Subrack (AC/DC) -- PMU DIP Switch:
The DIP switch is positioned on the right panel of the PMU. The DIP switch has eight bits,
which are set to OFF before delivery.
The bits of the DIP switch are in binary format. The four least significant bits (1, 2, 3, and 4)
of the DIP switch define the secondary node address of the PMU. The four most significant
bits (5, 6, 7, and 8) are not defined, and they are reserved for future use.
You can set the monitoring address by setting the four least significant bits of the DIP
switch. The first bit corresponds to BIT0, and the fourth bit corresponds to BIT3.
The monitoring address of the PMU in main cabinet must be set to 3 (1100), and that in the
extension cabinet must be set to 7 (1110).
Right panel of the PMU
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Power Subrack (AC/DC) -- PSU (AC/DC) The power supply unit (PSU) converts the 220 V AC power to the -48 V DC power.
Function: 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 overtemperature protection and input overvoltage/undervoltage protection), and module
out-of-position alarm.
LEDs on the PSU (AC/DC) panel:
No. LED Color Status Description
1 Power running LED Green
ON steady Normal
OFF steady
There are faults (such as no AC input, or
overvoltage/undervoltage of AC input) on the mains, or the
PSU has no output.
2 Protection LED YellowOFF steady Normal
ON steady Temperature prealarm or fan prealarm
3 Fault LED Red
OFF steady
Normal, or the PSU has no output because of faults
(such as no AC input, or overvoltage/undervoltage of
AC input) on the mains.
ON steady
There is no output because of shutdown caused by
output overvoltage or by overtemperature, fan
fault, remote shutdown, or internal problems of the PSU.
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Power Subrack (AC/DC) --Wiring Unit (220 V) The wiring unit of the power subrack (220 V) provides power input wiring
terminal, power output wiring terminal, and wiring terminal for the battery, to
which the input power cable, output power cable, and power cable for the
battery are connected respectively.
No. Name Description
1Power input wiring terminal
The L wire is connected to the L wiring terminal
and the N wire is connected to the N wiring
terminal.
2Power switch of the battery
The power switch of the battery controls the
battery current.
3Power output wiring terminal
The -48 V power cable is connected to the
wiring terminals LOAD1(-) and LOAD2(-).
The -48 V RTN cable is connected to the RTN
(+) wiring terminal.
4
Wiring terminal for
supplying the power of
the battery
The -48 V power cable of the battery is
connected to the BAT(-) wiring terminal. The
-48 V RTN cable of the battery is connected to
the BAT(+) wiring terminal.
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Batteries Two 48 V 12 Ah battery groups, equivalent to a 48 V 24 Ah battery group, can be
installed at the bottom in the power cabinet and occupy a space of 3 U.
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Heater
The heater functions in the low-temperature environment to provide
suitable working temperature for the batteries in the power cabinet or
transmission cabinet. When the working temperature is lower than the
temperature specification for the battery, the battery capacity declines.
So the heater is installed in the battery cabinet to provide the optimal
working temperature for the batteries.
The technical specifications of the heater are as follows:A heater keeps the cabinet temperature higher than –10 . 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. ℃
The maximum power consumption of a 220 V heater is 300 W.
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Sensors Door Status Sensor
The door status sensor is made up of two parts, the magnet part and the switch part.
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Sensors Temperature Sensor
The temperature sensors consist of the ambient temperature sensor, the air inlet
temperature sensor, and the air outlet temperature sensor.
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Sector 1 Typical Configuration of BTS3900A Cabinet
Sector 2 Components of the Power Cabinet
Sector 3 Components of the RF CabinetSector 3 Components of the RF Cabinet
Sector 4 Components of the APM30 Transmission Cabinet
Sector 5 Working Mode of MRFU
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Components of the RF Cabinet DCDU-02
FAN Unit
FMUA
MRFU
Door Status Sensor
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DCDU-02
The Direct Current Distribution Unit - 02 (DCDU-02) supplies four -48 V DC power
outputs.
The DCDU-02 has the following functions:
Receives -48 V DC power input.
Supplies four -48 V DC power outputs to the boards
and modules in the cabinet.
Provides surge protection of 10 kA in differential mode
and 15 kA in common mode and also provides dry contact
alarms of surge protection failure.
The panel of the DCDU-02 on the left of the cabinet.
The panel of the DCDU-02 on the right of the cabinet.Operating principles of the DCDU-02
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DCDU-02 Ports on the panel of the DCDU-02:
Item Label Description
Wiring
terminal
for power input
“NEG(-)” For low level input
“RTN(+)” For high level input
Power switches“RFU0” ~“ RFU5”、“ FMUA” 、“ Spare”
“RFU0” to “RFU2” control the current of the three RFUs on the left
of the cabinet. “RFU3” to “RFU5” control the current of the three
RFUs on the right of the cabinet. “FMUA” controls the current of the
FMUA. “Spare” controls the current at the “Spare” port.
Power output ports“RFU0” ~“ RFU5”、“ FMUA” 、“ Spare”
“RFU0” to “RFU2” control the power supply to the three RFUs on
the left of the cabinet. “RFU3” to “RFU5” control the power supply
to the three RFUs on the right of the cabinet. “FMUA” controls the
power supply to the FMUA. “Spare” is reserved.
Dry contact
output port“SPD ALM” Dry contact alarm output port
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FAN Unit The FAN unit refers to the fan box. The FAN units perform ventilation and heat
dissipation for cabinets. One FAN unit contains two independent fans.
The FAN unit performs the following functions for the cabinet: Provides forced ventilation and heat dissipation.
Supports the temperature detection.
The FAN unit supports: The automatic speed adjustment based on temperature and the speed adjustment by the
main control unit.
The fan rotation control function. The FAN unit stops the rotation of the fans when the
ambient temperature is low.
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FMUA The FMUA (Fan Environment Monitor) is a fan environment monitoring unit.
Function: Supplying -48 V DC power to FAN units.
Collecting the alarm information of the environment in the cabinet. The environment alarms
refer to the temperature, humidity, smoke, water immersion, and door status alarms.
Collecting the surge protection alarm information of the DCDU-02.
Monitoring the operating status of fans and supporting the following two modes of fan speed
adjustment: the automatic adjustment based on the temperature and the adjustment by the
main control unit.
Controlling the fan rotation. The FMUA stops the rotation of the fans when the ambient
temperature is low.
Detecting and reporting the temperature.
Supporting the cascaded and extension FMUA through the RS485 port.
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FMUA Ports on the FMUA:Port Type Port Connector Type Function
Power port -48V 3V3 power connector Leading -48 V DC power input
RS485 port
COM IN RJ45 connector Connected to the BBU or the upperlevel FMUA
COM OUT RJ45 connector Connected to the lower-level FMUA
TEM RJ45 connector Cabinet temperature monitoring port
TEM_HUM ARRESTER RJ45 connector
Connected to the SPD ALM port on the DCDU-02 module through the
monitoring signal cable between the FMUA and the DCDU
Ports connected
to
FAN units
FAN04PIN connector
Connected to the FAN unit in the left part of the cabinet through the
monitoring signal cable between the FMUA and the FAN unitFAN1
FAN24PIN connector Connected to the FAN unit in the right part of the cabinet through the
monitoring signal cable between the FMUA and the FAN unitFAN3
Boolean alarm
port
The first group
(from left to right)
Dry contact
connector4-way extension Boolean alarm ports
The second group
(from left to right)
Dry contact
connector
The third group
(from left to right)
Dry contact
connectorPorts for the smoke sensor and door status sensor
The fourth group
(from left to right)
Dry contact
connectorPorts for the water sensor
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FMUA
LEDs on the FMUA:
LED Color State Meaning
RUNGreen
ON for 1s and OFF for 1sThe module is functional and
communicates with the BBU properly.
ON for 0.125s and OFF for 0.125sThere is power supply, but the
communication with the BBU incurs faults.
OFF steady No power input is available.
ALARMRed
ON for 0.125s and OFF
for 0.125s
Alarms are generated on the fans in both
the left and right parts of the cabinet.
ON for 1s and OFF for 1sAlarms are generated on the fans in the
right part of the cabinet.
ON steadyAlarms are generated on the fans in the
left part of the cabinet.
ON for 2s and OFF for 2s Other alarms are generated.
OFF steadyNo alarm is detected, or no power input is
available.
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MRFU Module The MRFU is a multi-carrier RF filtering unit. One MRFU supports a maximum of
6 carriers in GSM mode, 4 carriers in UMTS mode, 6 carriers in GSM+UMTS
mode.
Functions: Implements the direct frequency conversion technique in the transmit channel, modulates
the baseband signals to GSM RF signals; then, sends the signals to the antenna for
transmission through the duplex filter after filtering, amplifying, and combining the RF
signals. The combining can be performed as required.
Receives RF signals from the antenna and performs down-conversion, amplification, analog-
to-digital conversion, digital down-conversion, matched filtering.
Provides power sharing. Improves the network coverage, reduces the interference and
power consumption and save the device cost.
Provides power control, reverse power detection.
Provides standing wave detection.
Supplies power to the TMA and controls the RET antenna.
Generates the CPRI clock, recovers the CPRI clock of lost synchronization, and detects
alarms.
Controls Digital Predistortion (DPD) based on feedback signals.
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Logical structure of the MRFU The MRFU consists of the high-speed interface unit, signal processing unit,
power amplifier, and duplexer.
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MRFU Board
Size : 397.25mm ( h ) ×70.62mm ( w ) ×305mm ( d ) Weight : 10Kg Ports on the panel:
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.
Interconnection
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.
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MRFU Board
LEDs on the MRFU panel:
LED Color Status Description
RUN Green ON The power input is normal, but the module is faulty.
OFF There is no power supply, or the module is faulty.
1s ON, 1s OFF The module is running properly.
0.2s ON, 0.2s OFF The software is being loaded to the module.
ALM Red 1s ON, 1s OFF A fault alarm is generated.
OFF No alarm is generated.
ACT Green ON The module is functional and is correctly connected to the BBU.
OFF The connection with the BBU is not set up.
VSWR Red OFF No VSWR alarm is generated.
ON The VSWR alarm is generated on the ANT_TX/RX port.
CPRI0 Red/Green 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 Red/Green 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.
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Door Status Sensor The door status sensor consists of two parts, the magnet part and the switch
part.
Switch part of the door status sensor
Magnet part of the door status sensor
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Sector 1 Typical Configuration of BTS3900A Cabinet
Sector 2 Components of the Power Cabinet
Sector 3 Components of the RF Cabinet
Sector 4 Components of the APM30 Transmission CabinetSector 4 Components of the APM30 Transmission Cabinet
Sector 5 Working Mode of MRFU
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Components of the Transmission CabinetAPMI ( The same as the chapter 2 )AFMU ( The same as the chapter 2 )DCDU-03
Sensors ( The same as the chapter 2 )
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DCDU-03 Configured with MCBs of different specifications, the DCDU-03 can be classified
into DCDU-03A, DCDU-03B, DCDU-03C and DCDU-03D. The four types of DCDU-
03 have the same appearance, engineering specifications, and ports.
The Direct Current Distribution Unit (DCDU-03) provides the following functions:
Providing nine -48 V DC outputs to meet multiple power distribution requirements in
scenarios of distributed and separated base stations through different MCB configurations.
Providing surge protections through the built-in DC surge protection board.
Providing surge protection alarm signals and reporting the surge protection alarms in time.
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DCDU-03
Port SpecificationCross-Sectional
Area (Unit: mm2)Remarks
DC input
terminal
Supporting M6 2-
hole OT terminal
DCDU-03A:6 DCDU-03B:25 DCDU-03C:25 DCDU-03D:25
-
DC output
terminal
LOAD0 to LOAD8 (from
left to right)2.5
Three rows of wiring terminals for outputs:
NEG(-), RTN(+), and PGND, where, the last
three pairs of the PGND wiring terminals
support the grounding of the M4 2-hole OT
terminals, as shown in the red boxes in
Figure
Supporting the output power cable with a
maximum cross-sectional area of 6 mm2]
Surge protection
Alarm wiring terminal
Supporting 2-pin
cord end terminal-
2-pin cord end terminal not distinguished
from different polarities
Ports on the panel of the DCDU-03:
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Sector 1 Typical Configuration of BTS3900A Cabinet
Sector 2 Components of the Power Cabinet
Sector 3 Components of the RF Cabinet
Sector 4 Components of the APM30 Transmission Cabinet
Sector 5 Working Mode of MRFUSector 5 Working Mode of MRFU
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The main limitation of MRFU
MRFU supports whole frequency band of PGSM 900MHz, high 45MHz
frequency band and low 45MHz frequency band of DCS1800MHz. High 40MHz
frequency band and low 40MHz frequency band of 1900MHz.
MRFU 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
Low 40MHz of 1900MHz 1930-1970MHz 1850-1890MHz
High 40MHz of 1900MHz 1950-1990MHz 1870-1910MHz
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The main limitation of MRFU
The instantaneous frequency bands supported by MRFU.
Power sharing doesn’t support Concentric cell, Co-BCCH, IBCA, RAN sharing while
static power can support these functions.
MRFU supports 2-way RX diversity. 4-way RX diversity and TX diversity are not
supported.
MRFU Type Number of TXfrequency band of TX
Number of RXfrequency band of RX
GSM mode 1 15MHz 2 25MHz
UMTS mode 1 20MHz 2 25MHz
GU dual mode 1 15MHz 2 25MHz
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Configuration principle of MRFU Basic configuration principle:
One MRFU supports a maximum cell configuration of S6.
A single BTS3900 provides a maximum of 36 carriers with the maximum cell configuration
of S12/12/12. In addition, a site configured with the BTS3900s can support a maximum of
72 carriers with the maximum cell configuration of S24/24/24.
One MRFU does not serve two cells. Each cell with a single antenna can be configured with
a maximum of two MRFUs.
MRFU supports 1-way TX and 2-way RX.
Star, chain, and ring, are supported between the BBU and the MRFUs.
When star and chain topology is adopted between the BBU and MRFUs, the MRFU
supports 3 levels of cascading in a chain and thus the BBU supports a maximum of 18 (6 x
3) MRFUs.
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Configuration principle Base on Limitation of MRFU
Assign frequency:
If the frequency interval of a cell is outside the range of 15MHz, 2 MRFUs can be considered
to be used and the range of frequency for each MRFU also should be within15MHz.
Generally, it is suggested that the number of carriers should be set to 2 MRFUs averagely if
2 MRFUs are used in a cell. For example: S8 should be configured as 4+4 when 2 MRFUs
are used. S7 should be configured as 3+4 when 2 MRFUs are used. If there’s limitation of
frequency band, S8 also can be configured as 3+5 or 2+6.
Frequency hopping:
Cell without frequency hopping. The cell can work normally when the range of frequency is
within 15MHz for each MRFU.
Cell with Baseband frequency hopping. The frequency range of 2 MRFUs must within 25MHz
when 2 MRFUs are used. And the range of frequency also must be within 15MHz for each
MRFU.
Cell with RF frequency hopping. The cell cannot adopt RF frequency hopping if the range of
frequency is out of 15MHz. Because the frequency range of 2 MRFUs must be within 15MHz
when 2 MRFUs are used.
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Configuration principle Base on Limitation of MRFU
Output power:
The maximum output power of MRFU is 80W.
The output power for each cell must fulfil the requirement of network plan. When the
specification doesn’t fulfil the requirement, it can be improved by adding MRFUs.
The output power of all the cell must be the same because power sharing is mutually
exclusive with concentric cell. For example, S7 configured as 3+4 when 2 MRFUs
are used. The output power of MRFU configured as 3 carriers must be the same as
that of MRFU configured as 4 carriers.
Specifications of output power is Class 2, please refer to the next page.
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Working mode GSM TRX UMTS TRXOutput power of each GSM TRX
(W ) Output power of each UMTS TRX(W)
GSM mode
1 0 80 0
2 0 40 0
3 0 31 0
4 0 27 0
5 0 18 0
6 0 16 0
GSM+UMTS mode
1 1 40 40
1 2 40 20
2 1 20 40
2 2 20 20
3 1 24 10
3 1 20 20
4 1 20 10
4 1 17 20
3 2 20 10
3 2 12 20
4 2 13 10
5 1 15 10
UMTS mode
0 1 0 60
0 2 0 40
0 3 0 27
0 4 0 20
Specifications of output power is Class 2:
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Antenna Configuration of MRFU Single Feeder.
Two module interconnection. 1TX and 2RX.
Double Feeder.
Single module. 1TX and 2RX.
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Transmit Mode and Receive Mode of MRFU Transmit Mode of MRFU.
Non-combination.
Receive Mode of MRFU.
2-way RX diversity.
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Typical configuration of MRFU Single MRFU.
Double feeder, 1TX + 2RX.
When a dual-polarized antenna is configured,
one TX channel and two RX channels are
supported. The ANT_RXB and ANT_TX/RXA
ports receive the signals from the antenna to
achieve RX diversity.
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Typical configuration of MRFU Two module interconnection.
Single feeder, 1TX + 2RX.
When the cell configuration is from S7 to S12,
two MRFUs need to be configured.
The ANT_TX/RXA port on each MRFU supports
the receiving and transmitting of signals. Two
MRFUs provide RX signals for each other through
the RF interconnection ports. Thus, the RX
diversity is implemented.
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Summary Functions of BTS3900A
Hardware structure of BTS3900A
Features and working mode of MRFU
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