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Security Level: Internal Use
www.huawei.com
2014
BSC /RNC6900
Hardware Structure
and System
Description
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2
The BSC /RNC6900 is an important
network element of Huawei Single RAN
solution. It adopts the industry-leading
multiple radio access technologies, IP
transmission mode, and modular design.
The BSC /RNC6900 can be flexibly
configured as a BSC /RNC6900 GSM,
BSC /RNC6900 UMTS, or BSC /RNC6900
GU as required in different networks.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 3
Know the functions and features of BSC /RNC6900
Master the hardware structure of BSC /RNC6900
Master the signal flow
Master the typical configuration of BSC /RNC6900
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 4
Reference
BSC /RNC6900 Technical Description
BSC /RNC6900 Hardware Description
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 5
Chapter 1 BSC /RNC6900 System Description
Chapter 2 BSC /RNC6900 Hardware Structure
Chapter 3 BSC /RNC6900 Signal Flow
Chapter 4 BSC /RNC6900 Typical Configuration
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved
Page 6
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 7
Location
The interfaces between the BSC /RNC6900 GSM and
each NE in the UMTS network are as follows:
Iub Interface: the interface between the NodeB and RNC.
Iur Interface: the interface between the RNC and RNC.
Iu-CS Interface: the interface between the MSC and MGW.
Iu-PS Interface: the interface between the RNC and SGSN
Iu-BC Interface: the interface between the RNC and CBC
The interfaces between the BSC /RNC6900 GSM and
each NE in the GSM network are as follows:
Abis Interface: the interface between the BTS and BSC
A Interface: the interface between the BSC and MSC or MGW
Gb Interface: the Interface between the BSC and SGSN
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 8
BSC /RNC6900V9R11C00
BSC6000/BSC6810
Unitary logic
Frame
Unitary OM SMP
Configuration
Maintenance
Alarm
Performance
OS
Internal
Communication
Unitary
Resource
Management
Co-Transmission
Unitary Control
Plane
GBSC Control
Plane Optimize
XPUb
DPUe
POUc
FG2c
GOUc
UOIc
AOUc
Frame Unitary
Multi-kernel
Boards
Transmission
and Resource
Management
Unitary
Pool resource
BSC /RNC6900 New
Features
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 9
Smooth evolution from BSC to RNC with software upgrade
Reducing CAPEX by reusing hardware
Dynamic capacity adjustment between 2G&3G
Software
upgrade
BSC /RNC6900 Product Charactersmulti-mode amalgamation
BSC
BSC
RNC
RNC
RNC
BSC
GSM&UMTS cabinet GSM&UMTS co-cabinet
RNC
RNC
BSC
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 10
Centralized OMC for GSM&UMTS, unified platform for network construction, 2G/3G network
planning, performance evaluation and trouble shooting etc.
Simplifying the network architecture, reducing co-ordination and maintenance effort, man
power and OPEX Saving
PM Management
Configuration Management
Network Optimization
Fault Management
Unified OAM toolkits: Easier 2G/3G trouble shooting
Unified GENEX : Unified 2G/3G network planning,
performance evaluation and performance trouble shooting
Unified CME : Simultaneous 2G/3G data configuration,
correctness and efficiency guaranteed
BSC /RNC6900 Product CharactersCo OAM
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 11
pT
RA
U
pT
RA
U
IP UNI-BTS
UNI-BTS UNI-BSC Co-transmission
UDP
IP
/
PPP
IP SW
Router
FP
FP
FP
3G
2G
3G
2G
pT
RA
U
pT
RA
U
FP
FP
FP
UDP
IP
/
PPP
IP SW
Router
pTRAU
Inte
rfac
e b
oa
rd
5-10% Gain
0.2 0.1 0.05 0.03 0.02 0.01 0.005 0.002 0.001
GOS
Tra
ffic
Ga
in (
%)
10
9
8
7
6
5
4
3
2
1
0 With unified transport resource management,
bandwidth can be shared by UMTS&GSM.
Without Co-trans Co-trans
UMTS / GSM UMTS + GSM Traffic rejection
Multiplexi
ng
Gain
BSC /RNC6900 Product CharactersCo TRM
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 12
UMTS
GSM
Cs service PS service
Service direction on UMTS/GSM
Heavy
Load
Heavy
Load
Heavy
Load
Heavy
Load
UMTS
GSM
Load control between UMTS/GSM
Load control by
inter-RAT HO
3G/2G cell load consideration make traffic
load spread in UMTS&GSM evenly, network
usage efficiency improved
3G/2G cell load consideration make it more
accurate for the service direction, better
performance achieved
Huawei Lab Simulation
BSC /RNC6900 Product CharactersCo RRM
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 13
SW upgrade with Legacy
HW + New HW (optional)
SW upgrade with Legacy
HW + New HW (expansion)
BSC6000 BSC6810 and BSC
/RNC6900 Evolution Paths
2009 2008 2006 2010Q1 2008Q3
GBSS8.1/RAN10 GBSS9.0/RAN11 GBSS12.0/RAN12
BSC6000
SW upgrade with
Legacy HW +
New HW
(optional)
BSC6810
BSC
/RNC6900 BSC Only
2009Q2
BSC
/RNC6900 RNC Only
2009Q1
BSC
/RNC6900 Dual mode
Note : Legacy HW is HW available from GBSS8.1/RAN10.0 for BSC /RNC6900
BSC
/RNC6900 BSC Only
BSC
/RNC6900 RNC Only
BSC
/RNC6900 Dual mode
BSC6810
Naming changing to BSC
/RNC6900
SW upgrade with Legacy
HW + New HW (expansion)
SW upgrade with Legacy
HW + New HW (optional)
SW upgrade
Naming changing to BSC
/RNC6900
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 14
BSC /RNC6900 Capacity Index
BSC /RNC6900 GSM only
Item 1MPS+1TCS 1MPS+1EPS+2TCS 1MPS+2EPS+2TCS
Number of
cabinets
2 2 2
BHCA(K) 1750 3500 5250
Traffic volume
Erl
6500 13000 19500
Number of TRXs 1024 2048 3072
Number of active
PDCHsMCS-9
4096 8192 12288
Typical configuration specifications of the BSC /RNC6900
GSM(BM/TC separated and Abis over non-IP R11 board)
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 15
Chapter 1 BSC /RNC6900 System Description
Chapter 2 BSC /RNC6900 Hardware Structure
Chapter 3 BSC /RNC6900 Signal Flow
Chapter 4 BSC /RNC6900 Typical Configuration
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 16
Chapter 2 BSC /RNC6900 Hardware Structure
2.1 Frame and Subrack
2.2 Board Introduction
2.3 Cable Introduction
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 17
BSC900 Hardware--Cabinet
The BSC /RNC6900 uses the Huawei N68E-22 cabinet and the
Huawei N68-21-N cabinet.
The two models of cabinets have the same appearance.N68E-22 is
divided into a single-door cabinet or a double-door cabinet.
Item Specification
Height of the
available space
46U
Weight Empty cabinet100 kg
Cabinet in full
configuration300 kg
Input voltage
range
-40 V to -57 V
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 18
BSC900 Hardware--Cabinet
The BSC /RNC6900 GSM cabinet is
classified into main processing rack (MPR),
extended processing rack (EPR), and
transcoder rack (TCR).
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 19
BSC900 Hardware--Subrack
The BSC /RNC6900 GSM subrack has a standard width of 19 inches. The
height of each subrack is 12 U. The boards are installed on the front and
rear sides of the backplane, which is positioned in the center of the subrack.
A subrack provides 28 slots. The slots on the front of the subrack are
numbered from 0 to 13, and those on the rear are numbered from 14 to 27.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 20
BSC900 Hardware--Subrack
1 Fan box 2 Mounting ear 3 Guide rail
4 Front cable
trough
5 Boards 6 Grounding
screw
7 DC power
input port
8 Port for the
monitoring signal
cable of the power
distribution box
9 Cover plate
of the DIP
switch
Front View Rear View
Classification of BSC /RNC6900 GSM subracks
Item Index
Height of the subrack 12U
Weight of the subrack Empty: 25kg;
Full configuration57kg
Consumption l MPS subrack: 1000W
l EPS subrack: 1000W
l TCS subrack:1000W
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 21
DIP Switch on the Subrack The DIP switch on the subrack has eight bits numbered in ascending
order from 1 to 8
If the bit is set to ON, it indicates 0. If the bit is set to OFF, it indicates 1.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 22
DIP Switch on the Subrack
The function of the switch 6?
Subrack
number
Subrack code
1 2 3 4 5 6 7 8
Subrack 0 ON ON ON ON ON ON ON OFF
Subrack 1 OFF ON ON ON ON OFF ON OFF
Subrack 2 ON OFF ON ON ON OFF ON OFF
Subrack 3 OFF OFF ON ON ON ON ON OFF
Subrack 4 ON ON OFF ON ON OFF ON OFF
Subrack 5 OFF ON OFF ON ON ON ON OFF
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 23
Chapter 2 BSC /RNC6900 Hardware Structure
2.1 Frame and Subrack
2.2 Board Introduction
2.3 Cable Introduction
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 24
BSC /RNC6900 Overall Structure The overall structure of the BSC /RNC6900
Switching Subsystem;
Service Processing Subsystem;
Clock Synchronization Subsystem;
Interface Synchronization Subsystem;
OM Subsystem.
GO-Mode
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 25
Switching Subsystem Functions
Provides intra-subrack Medium Access Control (MAC) switching
Provides intra-subrack Time Division Multiplexing (TDM) switching
Distributes clock signals to the service processing boards
Provides inter-subrack switching
Provides switching channels for traffic data
Provides OM channels
Hardware Involved
TDM switching TNUa board
MAC switching SCUa board
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 26
BoardTNUa
Port Function Matching
connector
TDM05 TDM high-speed serial port, used to connect
the TNUaS between subracks
DB14
GTNU
PARC
RUN
ALM
ACT
TNM5
TNM4
TNM0
TNM1
TNM2
TNM3
The TNUa is the TDM switching unit in the BSC /RNC6900.
The active and standby TNUa are inserted in slot 4 and slot 5.
The TNUa board performs the TDM switching function, which
is the TDM switching center of the system.
The TNUa has the following functions:
Providing 128 K 128 K TDM switching
Allocating TDM network resources, establishing, and releasing
radio links
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 27
BoardSCUa
Port Function Matching
EHT09 10M/100M/1000M Ethernet ports, used to connect subracks RJ45
EHT1011 10M/100M/1000M Ethernet ports, used to connect GBAM (Only the
main subrack is connected with the GBAM)
RJ45
COM Debugging port RJ45
CLKIN Clock source port, used to receive the 8 kHz clock signals from the
panel of the GGCU
RJ45
TESTOUT Clock test signal port, used to output clock test signals SMB connector
The SCUa is the switching control unit in the BSC
/RNC6900.
The active and standby SCUa are inserted in slot 6 and 7.
The SCUa board provides maintenance management of the
subrack and GE switching platform for the subrack.
The SCUa has the following functions:
Performing maintenance management of the subrack
Providing a GE platform for the subrack
Providing clock information for the other boards in the same
subrack except the GCUa
SCUa
PARC
RUN
ALM
ACT
COM
TESTOUT
CLKIN
ACTLINK
10/10
0/1000B
ASE-T
RESET
ACTLINK
8
9
0
1
2
3
4
5
6
7
11
10
ACTLINK
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 28
Service Processing Subsystem Functions
User data transfer
Radio channel ciphering and deciphering
System admission control
Data integrity protection
Mobility management
Cell broadcast service control
Data volume reporting
Radio access management
CS service processing
PS service processing
Radio resource management and control
System information and user message tracing
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 29
Service Processing Subsystem
Hardware Involved
XPUa/b board, SPUa/b board, DPUa/b/c/d/e board
Board Specification
XPU/SPU is the signaling processing unit
SPU board can process GSM/UMTS signaling panel, XPU board can process
GSM signaling panel
SPU board Works for BSC /RNC6900 GU mode
XPU board Works for BSC /RNC6900 GSM only mode
The postfix of a board contain 4 logic subsystem, and the postfix of b board
contain 8 logic subsystem
Services Process Unit DPUa/b/c/d/e
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 30
Board Introduction-XPU/SPU
Loaded with different software, the XPUa board is functionally
divided into main control XPUa board and non-main control
XPUa board.
XPUa
PARC
RUN
ALM
ACT
10/100
/100
0BAS
E-T
ACTLINK
0
1
2
3
The 0 subsystem of main control XPU/SPU
board is MPU, used to manage the user panel
and signaling plane resources within the
subrack and process the signaling.
The subsystem of non-main control XPU/SPU
board is CPU, used to process the signaling.
For GSM Only mode, one MPU for the system
is enough. If the system upgrade to GU mode,
one MPU should for one subrack.
Main control
XPUa
Non-Main
control XPUa
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 31
Board IntroductionDPUc
Function
DPUc process CS services and perform the voice coding and
decoding function. It works as subrack system pool mode.
Provides the speech format conversion and data forwarding
functions when configured in BM subrack.
Provides the Tandem Free Operation (TFO) function
Provides the voice enhancement function
Detects voice faults automatically
DPUd board works for GSM services.
DPUa
PARC
RUN
ALM
ACT
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 32
Board introductionDPUd
Function
The DPUd is the Data Processing Unit for PS services. It can be
installed in slots 811 in MPS and 8-27 in EPSit processes the
packet services for the BSC.
Each DPUd supports 1024 activated PDCHs at the same time,
and all the PDCHs support MSC-9 coding.
Packet links processing function.
PS fault self-detection.
DPUd board works for GSM services.
DPUa
PARC
RUN
ALM
ACT
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 33
Subsystems Five: Interface Board System
Board
Type
Physical
Board
Board specification Scene
EIUa Transmits, receives, encodes, and decodes 32 E1s/T1s. GSM Only
OIUa Provides one STM-1 port for TDM transmission GSM OnlyGU
Old
Boards
FG2a Provides eight channels over FE ports or two channels over GE electrical ports
GSM OnlyGU
GOUa Provides two channels over GE optical ports GSM OnlyGU
PEUa Provides 32 channels of E1s/T1s for HDLC transmission
Extracts line clock signals
GSM OnlyGU
Multi-
kernel
Boards
FG2c Provides 12 channels over FE ports or four channels over GE electrical ports
GSM OnlyGU
GOUc Provides four channels over GE optical ports GSM OnlyGU
POUc Provides four channels over channelized optical STM-1/OC-
3 ports based on IP protocol
Extracts line clock signals
GSM OnlyGU
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 34
Mapping for Interface Board and Version Physical
Board
Function Interface Type
Abis Ater A Gb Pb
PEUa FR BSC V9R8C01
HDLC BSC V9R8C01
IP mBSCV9R11 mBSCV9R11
FG2a IP BSC V9R8C01 BSC V9R8C01 BSC V9R8C01
GOUa IP BSC V9R8C01 BSC V9R8C01
POUc TDM+ HDLC mBSC V9R11 mBSC V9R11 mBSC V9R11 mBSC V9R11 mBSC V9R11
IP mBSC V9R11 mBSC V9R11 mBSC V9R11
FG2c IP mBSC V9R11 mBSC V9R11 mBSC V9R11 GOUc IP mBSC V9R11 mBSC V9R11 mBSC V9R11
EIUa Abis TDM BSC V9R1
Ater TDM BSC V9R1
Pb TDM BSC V9R1
A TDM BSC V9R1
OIUa Abis TDM BSC V9R1
Ater TDM BSC V9R1
Pb TDM BSC V9R1
A TDM BSC V9R1
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 35
Co-Transmission for the Interface Board Physical
Board
Function Interface Board Sharing
Iub Iu(Iur/IuCS/Iu
PS)
Abis A Ater Gb
FG2a IP Iub/Iu Co-Interface board Abis/A Co-Interface board Gb Separated
GOUa IP Iub/Iu Co-Interface board Abis/A Co-Interace board Gb Separated
AOUc ATM Iub/Iu Co-Interface board
UOIc ATM Iub/Iu Co-Interface board
IP Iub/Iu/Abis/A(Ater)
POUc TDM+ HDLC Abis/A(Ater)/Gb(Pb) Co-Interface board
IP Iub/Iu/Abis/A(Ater) Co-Interface board
FG2c IP Iub/Iu/Abis/A(Ater)/Gb(Pb) Co-Interface board
GOUc IP Iub/Iu/Abis/A(Ater)/Gb(Pb) Co-Interface board
EIUa Abis TDM
Ater TDM
Pb TDM
A TDM
OIUa Abis TDM
Ater TDM
Pb TDM
A TDM
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 36
Board Introdction-FG2c
The FG2c board supports IP over Ethernet transmission.
The FG2c board performs the following functions:
Provides 12 channels over FE ports or four channels over GE
electrical ports
Provides the link aggregation function at the MAC layer
Provides the routing-based backup and load sharing
Supports the transmission of data over all its Ethernet ports on the
basis of the synchronized clock signals
Supports the AbisAGbIuIub interfaces
Port Function Connector type
10/100BASE-T 10M/100M Ethernet ports, used to transmit 10/100M
signals
RJ45
10/100/1000BASE-T 10M/100M/1000M Ethernet ports, used to transmit
10/100/1000M signals
RJ45
2M02M1 Port for 2 MHz clock signal outputs male connector
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 37
Board Introduction-GOUc
As an optical interface board, the GOUc board supports IP
over Ethernet transmission.
The GOUc board performs the following functions:
Provides four channels over GE optical ports
Provides the routing-based backup and load sharing
Extracts line clock signals
Supports the Abis, A, and Gb,Iu, Iub interfaces
Port Function Connector
Type
RX Optical port, used to transmit and receive optical signals. TX
refers to the transmitting optical port, and RX refers to the
receiving optical port.
LC/PC
TX
2M02M1 Port for 2 MHz clock signal outputs SMB male
connector
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 38
Board Introduction-POUc
As an interface board, the POUc board supports IP over
channelized STM-1/OC-3 transmission.
The POUc board performs the following functions:
Provides four channels over channelized optical STM-1/OC-3 ports based
on IP protocol
Supports the PPP function
Extracts line clock signals
Provides the Automatic Protection Switching (APS) function between the
active and standby POUc boards
Supports the A, Abis, Gb, Ater,Pb, Iu, Iub interfaces
Port Function Connector type
RX Optical port, used to transmit and receive optical signals. TX refers to the
transmitting optical port, and RX refers to the receiving optical port.
LC/PC
TX
2M0
2M1
Output ports for clock signals. These ports are used to transmit the 2 MHz line
clock signals to the GCUa/GCGa board. The clock signals are extracted from
upper-level devices and serve as the clock sources of the BSC /RNC6900
system.
SMB male
connector
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 39
Subsystems Four: Clock Subsystem Clock Source
Bits clock
Line clock
GPS
Reference Clock for the MPS or EPS
The reference clocks are provided by the GCUa. The reference clocks generate
8kHz clock signals through the GCUa.
MPS: The clock signals are sent to the SCUa in the MPSa subrack through the
backplane. Then, the clock signals are sent to other boards in the same subrack.
EPS: The clock signals are sent to the SCUa board in the EPSa subrack through
the clock cable. Then, the signals are sent to other boards through the backplane.
Reference Clock for the TCS
Each TCS extracts line clock from the A interface. The line clock is processed
through A interface panel and then generates 8 KHz clock signals.
The clock signals are sent to the SCUa in the subrack through the backplane. Then
the clock signals are sent to other boards in the same subrack.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 40
Structure of the Clock Synchronization
Subsystem
High-speed backplane channel
R
I
N
T
R
I
N
T
S
C
U
a
R
I
N
T
R
I
N
T
S
C
U
a
S
C
U
a
GCUa/GCGa
Clock module
RSS
8kHz
To BTS/NodeB
To BTS/NodeB To BTS/NodeB
RBS RBS
19.44MHz, 32.768MHz, 8KHz
19.44MHz, 32.768MHz,
8KHz
19.44MHz, 32.768MHz,
8KHz
8kHz
Clock cable
CN BITS GPS
8kHz
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 41
BoardGCUa
GGCU
PARC
RUN ALM ACT
8
9
COM0
COM1
0
1
2
3
4
5
6
7
CLK
OU
T
TE
ST
IN
TE
ST
OU
T
CL
KL
IN1
CLK
LIN
0
The GCUa is the general clock unit in the BSC /RNC6900. The
active and standby GCUa are configured in slots 12 and 13 in the
MPS. The GGCU board provides synchronous timing signals for the
system
The GCUa has the following functions:
Generating and keeping synchronous clock signals
Keeping the consistency of synchronization information output from the active
and standby GCUa Port Function Connector type
ATN-IN Reserved SMA male connector
CLKOUT0~9
Ports for transmitting synchronization clock signals. The ten
ports are used to transmit the 8 kHz clock signals to the
CLKIN port on the panel of the SCUa board.
RJ45
COM0,COM1 Reserved RJ45
TESTOUT Reserved SMB male connector
TESTIN Input port for testing external clock signals SMB male connector
CLKIN0-1 Synchronization clock input port, used to receive the 2.048
MHz clock signals or 2.048 Mbit/s code stream signals
SMB male connector
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 42
M2000
S
C
U
a
S
C
U
a
LANSWITCH
O
M
U
a
O
M
U
a
S
C
U
a
S
C
U
a
WEB LMT External
network
MPS
Internal
network
EPS
Internet cable
Serial cable
Subsystems Five: O&M Subsystem
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 43
Board Introduction OMU The OMUa board works as a bridge for the communication
between the WebLMT and the other boards in the BSC /RNC6900.
Function
Performing the configuration management, performance
management, fault management, security management, and loading
management functions for the system
To control the communication between the LMT/M2000 and the SCUa
board of the BSC /RNC6900
(1) Captive screw (2) Shielding finger (3) Ejector lever (4) LED (RUN)
(5) LED (ALM) (6) LED (ACT) (7) Button (RESET) (8) Button
(SHUTDOWN)
(9) USB port (10) Ethernet port (ETH0) (11) Ethernet port (ETH1) (12) Ethernet port
(ETH2)
(13) COM port (14) VGA port (15) LED (HD) (16) LED(OFFLINE)
(17) Hard disk (18) Screw for fixing the hard disk
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 44
Chapter 2 BSC /RNC6900 Hardware Structure
2.1 Frame and Subrack
2.2 Board Introduction
2.3 Cable Introduction
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 45
TNUa
Active
Board
Board
LVDS TDM path of backplane
Inter-TNUa Cable
TNUa
Standby
TNUaActive Board
Board TNUaStandby
TDM Switching Subsystem Intra-Subrack: Other boards in the subrack connect with TNUa
(Active/Standby) through LVDS (Low Voltage Differential Signal) high
speed serial ports of backplane.
Inter-Subrack: TDM units of every subrack fully interconnected with
each other through TNUa crossover cables.
In full intra-subrack
interconnection, 2 cables
support 8K bandwidth.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 46
Inter-Subrack Interconnections of
TNUa Crossover Cables
1
0 TNUa TNUa
TNUa TNUa
2 TNUa TNUa
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 47
Interconnection Between SCUa Active/standby SCUa boards: HiG interconnection; 30G bandwidth.
Intra-subrack : The SCUa board provides 48G GE switching capability
through backplane.
Inter-subrack : The SCUa boards are connected in star topology
through intercross cable using the GE ports on SCUa.
Switchin
g and
control
unit
Other board
Other board
Other board
Other board
Other board
Other board
Switchin
g and
control
unit
Switchin
g and
control
unit
RSS
RBS
RBS
High-speed
backplane channel Network cable
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The Physical Cable Between Subracks SCUa in MPS subrack
GE07 interconnect with EPS, open the port by MML command.
GE8/9 interconnect with main TCS
GE10/11 interconnect with GBAM
SCUa in EPS subrack
GE01 interconnect with MPS
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Interconnection Between Subrack
A interface
Pb interface Abis interface Ater interface
Subracks of BSC6000 compose an interconnection switching network
through cascade.
TCS
TCS TCS TC
EPS
MPS EPS BM
SCUa Star interconnection
TNUa Full interconnection
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Clock Synchronization Interconnection
The connection of the GCUa of the main
subrack and the extension subrack is
shown:
The active and standby GCUa output 10-way
signal channel respectively. A signal channel of
an active GCUa and that of a standby GCUa
are integrated through the Y-shaped cable.
Any of component including GCUa, Y-shaped
cable, and SCUa is faulty, the system clock
still can work normally.
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Chapter 1 BSC /RNC6900 System
Description
Chapter 2 BSC /RNC6900 Hardware
Structure
Chapter 3 BSC /RNC6900 Signal Flow
Chapter 4 BSC /RNC6900 Typical
Configuration
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GSM CS Signal Flow
Abis over TDM+A over TDM
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GSM CS Signal Flow Abis over HDLC/IP+A over TDM
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GSM CS Signal Flow
Abis over TDM+A over IP
Abis over HDLC/IP+A over IP
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GSM PS Signal Flow (Inner-PCU) Abis over TDM
Abis over HDLC/IP
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Signaling Flow on the A Interface Abis over TDM+A over TDM
the signaling processing board XPUa processes the signaling
according to the MTP3, SCCP, and BSSAP protocols.
A Over IP
The A interface board processes the MTP2 protocol
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Signaling Flow on the Abis Interface Abis over TDM/IP/HDLC
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Signaling Flow on the Gb Interface
Gb Over IP
the signaling processing board processes the signaling
according to the NS and BSSGP protocols. Then, the signaling
is transmitted to the Gb interface board through the SCUa
board.
The Gb interface board processes the signaling according to
the IP or FR protocol. Then, the signaling is transmitted to the
SGSN over the Gb interface.
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OM Signal Flow
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Chapter 1 BSC /RNC6900 System
Description
Chapter 2 BSC /RNC6900 Hardware
Structure
Chapter 3 BSC /RNC6900 Signal Flow
Chapter 4 BSC /RNC6900 Typical
Configuration
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Specification of the Board
XPUa/XPUb
350TRX/XPUa 640TRX/XPUb
No. of XPUa=TRX No./350TRX No. of XPUb=TRX No./640TRX
For GSM only system, we can be configured just one main control XPU,
which configured as RGCP
The control panel optimized for BSC /RNC6900, XPUa/XPUb can
congfigured in different subrack with Transcode board and interface board
averagely.
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Specification of the Interface Board
Physi
cal
Board
Function Interface Type
Abis Ater A Gb Pb
POUc TDM+
HDLC
512TRX 7168CIC 3906CIC 395Mbps mBSC
V9R11
IP 2048TRX 23040CIC 23040CIC FG2c IP 2048TRX 23040 790Mbps GOUc IP 2048TRX 23040 790Mbps EIUa Abis TDM 256TRX
Ater TDM 968CIC Pb TDM 968CIC A TDM 968CIC
OIUa Abis TDM 512TRX Ater TDM 1890CIC Pb TDM 1890CIC A TDM
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Typical
Configuration
Parameter Description
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Typical
Configuration Parameter Description