Transcript Document

ZXC10-BSC Sub-System
2004.10.3
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Subsystems of BSC
Lesson Objectives:
General Study
HIRS:High-speed Interconnection Routing Subsystem
SVBS:Selector Vocoder Bank Subsystem
PCFS:Packet Control Function Subsystem
CPS:Call Processing Subsystem
CDSUS:Channel Data Service Unit Subsystem
TS:Timing Subsystem
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General Study
• BSC working environment requirement
Working temperature: 0°C ~+55°C
Working humidity: 15%~93%
The density of dust in the equipment room with diameters of
should be ≤3*104 granules/m3.
over 5μm
• Power requirement
• BSC DC power
• 1)Voltage amplitude: The nominal voltage value of the BSC power supplied
by the power equipment in the equipment room is -48V. The permitted
variation range is -57V~-40V.
• 2)The noise level index contained in the DC power voltage should satisfy the
requirement in the overall technical specifications by the former MPT.
3)DC power should provide over-voltage
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BSC Mechanical Structure
--Center Rack
HIRS
CPS
CDSUS
TS
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BSC Mechanical Structure
--Vocoder Rack
SVBS
or
PCFS
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Mechanical Features
• BSC comprises the central rack and the vocoder rack.
• The central rack and the vocoder rack adopts the unified
racks and standard plug-in boxes, which provide
different functions due to the use of different plug-in unis.
• External dimensions of the rack (main body) (H*W*D):
2000 mm*810 mm*600 mm
• Outline dimensions of rack (after installation of top shelf
and
side
board)
(H×W×D):
2200mm×870mm×600mm
• From top to bottom, each rack includes one distribution
plug-in box, 3~5 functional plug-in boxes, one fan plug-in
box, and dust-proof shelf. There are three types of
functional plug-in boxes.
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HIRS
HIRS Subsystem is switching center and packet data
exchange platform of BSC.
Functions of HIRS：
 Packet data switching
 Timing distribution，monitor GPS
 Software downloading
 Operation and maintenance management on the whole BSS
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HIRS Shelf Structure
P N N N N N N N N N N N N N N N N N N N N N N P
S I I I I I I I I I C C I I I I I I I I I I I S
M M M M M M M M M M M M M M M M M M M M M M M M
B
B
NCM: Network Control Module
NIM: Network Interface Module
PSMB：Power Supply Module
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Input and Output interface
RS422 interface
Clock interface
HIRS Subsystem
Operate and maintain interface
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NCM
NCM is the core module in HIRS shelf
 When NCM is in slot 11,it must connect with port 6 of NIM
in slot 9 via the internal serial bus on backplane.
 When NCM is in slot 12,it must connect with port 6 of NIM
in slot 14 via the internal serial bus on backplane.
 2 NCM working mode: active and standby
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NCM Functions
Major functions of NCM :
 Gateway function:data receiving of CO bus and
distribution of DIS bus,routing of data frame inside/outside of
the local shelf
 Distribution of software of respective modules and
configuration information;
 Fault detection, isolation, report and recovery in HIRS
network;
 GPS clock distribution;
 Serving as the foreground PC of BSM to communicate
with the background through 10/100Mbps Ethernet
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NCM Panel Indicator&Interface`
NCM
RUN
ALM
ACT
M/S
RST
TEST
RS232
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Indicator:
RUN:when module normal running,it quick
flash
ALM:OFF indicates no fault
ACT:Active/Standby State
Interface:
TEST:Network interface,for debugging but
not connected in operations
RS-232:serial port, for debugging but not
connected in operations
RST:Manual resetting on boards
M/S:Manual Switching active/standby mode
on the foreground
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NIM Functions
 Receive/send RS-422 serial data
 Receive/send data through DISCO
 8＋1 redundancy
 Clock receiving and distributing
 Reports module working states to NCM via
I2C bus and accepts NCM control
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Network address distribution
Node address
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
０
1
2
N
C
M
N
C
M
3
Port
Number
4
5
6
7
2
3
4
5
6
7
8
9
10
11
12
13
14
Configuration Direction
15
16
17
18
19
20
21
Slot No.
Configuration Direction
NIM Standby
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Network address distribution(Cont.)
Node address
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
０
N
C
M
N
C
M
3
4
5
Port address
1
2
6
7
Slot No.
2
3
4
5
6
7
8
9
10
11
12
NCM Network Address
BSSId = X，SubNetId = 0，
NodeId = 7，PortId = 6；
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13
14
15
16
17
18
19
20
21
CPM Network Address
BSSId = X，SubNetId = 0，
NodeId = 7，PortId = 7；
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NIM daisy chain
NIM :8 working + 1 standby and changeover
0
1
2
3
N
I
M
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4
5
6
7 backup
N
C
M
backup 8
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N
I
M
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NIM Panel Indicator
NIM
RUN
ALM
ACT
RST
RUN: A green indicator, blinking when the board
works normally.
ALM: A red indicator, lighting up or blinking in
case of board failure.
ACT: A green indicator, lighting up when the
board is in master mode.
RST: Reset button.
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SVBS--Selector/Vocoder Band Subsystem
SVBS is the core part for enabling voice services and
supporting SS7 signaling MTP1 and MTP2.
Judge and implement soft handoff: select a path in several
soft handoff path by the quality for code type conversion
Code type conversion function: It enables the conversion
between 64K PCM codes and variable rate of QCELP codes;
 Enables echo cancellation for PCM data on the forward link
Power control
Signaling handle
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SVBS Shelf Structure
P S S S S S S S S
S V V V V V V V V
M M M M M M M M M
B
S
V
I
C
M
S S S S S S S S S
V V V V V V V V V
I M M M M M M M M
C
M
P
S
M
B
SVICM: Selector Vocoder Interface Control Module
SVM:
Selector Vocoder Module
PSMB：Power Supply Module
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Input and Output interface
Connected with NIM via RS422 port
SVBS Subsystem
4*E1 interfaces connected with MSC
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SVICM Functions
S-HIRS:Communicate with HIRS Network
Distribute forward traffic and signaling（SVMSVICM  NIM）
Distribute reverse traffic and signaling (SVMSVICM  NIM）
Distribute signaling interior SVBS（SVMSVICM ）
Receive and Distribute Clock and TOD message
Manage and control SVM
Signaling handling
Code type conversion between MSC and BSS via
DTI
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Structure of SVICM
SVBS
SVICM
NIM
RS422
I2C
U
gateway
C_BUS
DIS
CO
时钟
SVC
Clock
distribution
SVM
1
SVM
7
SVM
8
DTI
4*HW
4*E1
MSC
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SVICM Panel Indicator
R UN
ALM
DT0
DT1
DT2
RUN: Running indicator (green), blinking during operation;
ALARM: Alarm indicator (red), lighting up when a
software error occurs;
DT0: 1st E1 connection indicator, lighting up to indicate
that the E1 link is connects;
DT3
R ST
DT1: 2nd E1 connection indicator, lighting up to indicate
that the E1 link is connects;
TEST
DT2: 3rd E1 connection indicator, lighting up to indicate
that the E1 link is connects;
R S232
DT3: 4th E1 connection indicator, lighting up to indicate
that the E1 link is connects;
RST: Reset button.
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SVM － Selector & Vocoder Module
 transcoding between PCM and QCELP
 reverse outer-loop power control
 soft handoff
 handle layer 3 of Abis interface and layer 2 of IS-95
signaling
 assign the timeslot
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Structure of SVM
SVE1
Data Interface
SVP
maintenance bus
SVE2
HW interface
clock interface
SVE15
 A SVM contain 1 SVP and 15 SVEs.
 SVICM receive traffic data from the RS-422 port of NIM then forward to
SVM,SVP forward to SVE,SVE transcoding to PCM and send through
HW,in other direction,SVE transcoding PCM to QCELP or EVRC,then
send to SVP,then to SVICM,and then NIM.
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SVM
RUN
ALM
SVM Panel
Indicator
RUN: Running indicator (green), blinking
during working normally;
RST
ALARM: Alarm indicator (red), lighting up
when a software error occurs;
TEST
RESET: Reset button.
RS232
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PCFS-Packet Control Function Subsystem
Each BSC can support 10 PCFS subsystems.
Each PCFS subsystem comprises 1 PCFIM board and 8
PCF boards.
Each PCFS subsystem is connected with the PDSN via
PCFIM board, and provides a 10M/100M self-adaptive
physical Ethernet interface through the PCFIM board.
Each PCFS subsystem can carry 4000 PPP connections
(Dormant+Active), and 240 activated PPP connections (total
number of active ones).
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PCFS Functions
To Select a service path with best quality among multiple soft
handover paths for data GRE encapsulation.
Enables adaptation between GRE data packets and RLP data
packets;.
To establish, configure and maintain A8 and A10 links via A9
and A11 interfaces.
To establish PPP link between MS and PDSN to enable packet
data service transmission.
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PCFS Shelf Structure
P
S
M
B
1
P
P P P P P P P P C
C C C C C C C C F
F F F F F F F F I
M
2
3
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4
5
6
7
8
9
10
11
12
P
C P P P P P P P P
F C C C C C C C C
I F F F F F F F F
M
P
S
M
B
13
22
14
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15
16
17
18
19
20
21
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Input and Output Interface
PCFS provides a 10M/100M fast Ethernet interface to be
connected with PDSN.
PCFS provides a RS422-port to be connected with HIRS
switching network.
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CPS-Call Processing Subsystem
CPS is a joint point of BSS system’s resource
management and call signaling protocol
processing.
CPS comprises two modules:CPM and PAM.
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CPS Board
P
S
M
B
C
D
S
U
C
D
S
U
C
D
S
U
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C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C C C P
D P P A
S MMM
U
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G
P
S
T
M
T
C
M
G
P
S
T
M
P
S
M
B
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CPS Functions
Handle the signaling of Abis interface
Radio resource maintenance,management and distribution
Trunk resource management
provides A signaling interface. It fulfills A interface startup and
re-startup, A interface protective switching, activation of failing
data link, control of link labels, and delivery of A messages.
Control over loading of BSS;produce the message of A and ABIS
interface:establish the signaling link to CCM and SVICM
Manage the database of BSS,include the parameters of BSS
system,ground circuit resource,traffic channel resource,calling
record,performances record,handoff record and so on.
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Input and Output interface of CPS
NIM 7 port
RS422
Alarm box
RS485
CPS Subsystem
RS485
Connect to power modules of seven racks
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Hardware feature of CPM
According to the software function of CPM,CPM
should have the Hardware features below：
CPS sub-system is a joint point of BSS system’s resource
management and call signaling protocol processing,processing all
the signaling,so the CPM should be powerful.
The CPM is 1+1 hot standby
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CPM Panel
RUN
Run indicator
ALM
Fault indicator
ACT
Active/standby indicator
M /S
Active/standby switching key
RST
Reset key
RUN:running indication
ALM:error status indication
ACT:green,active status indication
M/S:active/standby switch
TEST
Ethernet debugging interface
RST:reset
TEST1:Ethernet debugging interface
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PAM Functions
monitor the running status of the power supply
modules in the BSC-side frames and the equipment room
environment signals, including temperature, humidity,
smoke, and so on.
report the result to the background operation and
maintenance console through the NCM for processing;
provides duplex RS232 and RS485 interfaces for the
connection of external monitoring devices and alarm box.
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CDSUS
--Channel Data Service Unit Subsystem
1. Convert signal between RS-422 interface and nonchannelized E1,transfer signaling and traffic data
between BSC and BTS.
2. BSC-CDSU and BTS-CDSU, have the same
hardware structure
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CDSU Panel
RUN
RUN
Running
DT0
ALARM
Alarm
DT1
DT0
Synchronization A
DT1
Synchronization B
RST
Reset Button
ALM
RST
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ASM
---In CDMA system, BSC communicates with BSC via
ASM board to enable inter-BSC soft handoff. The
communication link is connected to BSCs via E1 link.
---According to different bandwidth provided by the
communication link, ASM board is classified into ASM
board providing 2*E1 trunk and ASM board providing
4*E1 trunk.
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TS--Timing Subsystem
According to the CDMA standard,BSC and BTS
independently synchronization the timing signal
provided by GPS.
Timing subsystem provides such timing signal:
*PP2S
*16chips：19.6608MHz
*TOD message
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Timing distributing of BSC
1.2288MHz,PP2S,
1.2288MHz,
PP2S,Tod
19.6608MHz,
10MHz,PP2S,
Tod
1.2288MHz,PP2S
,Tod,Tx_clock,
Rx_clock
8kHz,2MHz,50Hz,
Tod
CPM
NCM
GPS
TM
GPS
TM
G
P
S
T
M
B
P
NCM
T
C
M
NIM
SVICM
SVM
NIM
SVICM
SVM
HIRS1
NCM
NCM
HIRS2
19.6608MHz,
10MHz,PP2S,
Tod
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1.2288MHz,
PP2S,Tod
1.2288MHz,PP2S
,Tod,Tx_clock,
Rx_clock
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BSC_CDS
U
1.2288MHz,PP2S,
8kHz,2MHz,50Hz,
Tod
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TS Box
P
S
M
B
C
D
S
U
C
D
S
U
C
D
S
U
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C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C
D
S
U
C C C P G
D P P A P
S MMM S
U
T
M
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C P
M S
T
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P
S
M
B
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TCM Functions
TCM board mainly provides the following functions:
1. It receives clock signals of active and standby GPSTMs;
2. It synthesizes and distributes 10MHz signals;
3. It receives 16CHIP and PP2S signals of active and standby
GPSTMs;
4. It implements phase-lock on 16CHIP signal;
5. It generates new PP2S.
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TCM Panel
RUN
green
ALM
red
LOCK
green
Lights up when the TCM works normally
Lights up when the TCM works abnormally
Lights up when the TCM is locked
CLK: an SMA socket, used for monitoring of the TCM’s 16chip
timing signal
PP2S: an SMA socket, used for monitoring of the TCM’s PP2S
timing signal and for BS testing
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GPSTM Function
GPSTM
Clock
10MHz
Clock
GPSTM
TCM
16CH IP
FDM
10MHz or 12MHz
PP2S
GPSTM receives 1PPS signal from GPS receiver and generates PP2S signal,
16CHIP signal, 10MHz signal and TOD signal via phase-lock for the usage of
the system. In case GPSTM cannot find the satellite, it provides the hold-over
function. According to the specifications, the wander of the board should not
be over 7ms in 24 hours; in this system, GPSTM implements less than 5ms
wander in 4 days. GPSTM also implements active/standby automatic
switching. It can detect and report board working states.
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GPSTM
RUN
Run indicator
ACTIVE
Active/standby indicator
GPSAIM
Indication of searching for satellite
Indication of IPPS phase exceeding 800ns
1PPSAIM
Fault indicator
AIM
Reset key
RST
16CHIP output
CLK
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PWR
Power switch
CONTROL
RS232
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The End
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