ZXC10-BSC Sub-System

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ZXC10-BSC Sub-System
2004.10.3
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Subsystems of BSC

• Lesson Objectives
• General Study
• HIRSHigh-speed Interconnection Routing
  Subsystem
• SVBSSelector Vocoder Bank Subsystem
• PCFSPacket Control Function Subsystem
• CPSCall Processing Subsystem
• CDSUSChannel Data Service Unit Subsystem
• TSTiming Subsystem

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General Study

• BSC working environment requirement
• Working temperature 0C 55C
• Working humidity 1593
• The density of dust in the equipment room
  with diameters of over 5µm should be 3104
  granules/m3.
• 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)
  (HWD) 2000 mm810 mm600 mm
• Outline dimensions of rack (after installation of
  top shelf and side board) (HWD)
  2200mm870mm600mm
• From top to bottom, each rack includes one
  distribution plug-in box, 35 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
PSMB NIM NIM NIM NIM NIM NIM NIM NIM NIM NCM NCM NIM NIM NIM NIM NIM NIM NIM NIM NIM NIM NIM PSMB
NCM Network Control Module NIM Network
Interface Module PSMBPower 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 functiondata 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 IndicatorInterface
Indicator RUNwhen module normal running,it
quick flash ALMOFF indicates no
fault ACTActive/Standby State Interface TESTNe
twork interface,for debugging but not connected
in operations RS-232serial port, for debugging
but not connected in operations RSTManual
resetting on boards M/SManual Switching
active/standby mode on the foreground
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NIM Functions

• Receive/send RS-422 serial data
• Receive/send data through DISCO
• 81 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
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Network address distribution(Cont.)
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NIM daisy chain
NIM 8 working 1 standby and changeover
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NIM Panel Indicator

• 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
PSMB SVM SVM SVM SVM SVM SVM SVM SVM SVICM SVICM SVM SVM SVM SVM SVM SVM SVM SVM PSMB
SVICM Selector Vocoder Interface Control
Module SVM Selector Vocoder Module
PSMBPower Supply Module
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Input and Output interface
Connected with NIM via RS422 port
SVBS Subsystem
4E1 interfaces connected with MSC
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SVICM Functions

• S-HIRSCommunicate 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
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SVICM Panel Indicator

• 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
• DT1 2nd E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• DT2 3rd E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• 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

• 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 Panel Indicator

• RUN Running indicator (green), blinking during
  working normally
• ALARM Alarm indicator (red), lighting up when a
  software error occurs
• RESET Reset button.

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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 (DormantActive), 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
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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 systems resource
  management and call signaling protocol
  processing.
• CPS comprises two modulesCPM and PAM.

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CPS Board
PSMB CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CPM CPM PAM G P S T M TCM G P S T M PSMB
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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 BSSproduce the message
  of A and ABIS interfaceestablish 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
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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 systems
  resource management and call signaling protocol
  processing,processing all the signaling,so the
  CPM should be powerful.
• The CPM is 11 hot standby

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CPM Panel

• RUNrunning indication
• ALMerror status indication
• ACTgreen,active status indication
• M/Sactive/standby switch
• RSTreset
• TEST1Ethernet 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
   non-channelized 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 Running
• ALARM Alarm
• DT0 Synchronization A
• DT1 Synchronization B
• RST Reset Button

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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 2E1 trunk
and ASM board providing 4E1 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
• 16chips19.6608MHz
• TOD message

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Timing distributing of BSC
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TS Box
PSMB CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CPM CPM PAM G P S T M TCM G P S T M PSMB
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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 Lights up when the TCM
  works normally
• ALM red Lights up when the TCM
  works abnormally
• LOCK green Lights up when the TCM is
  locked
• CLK an SMA socket, used for monitoring of the
  TCMs 16chip timing signal
• PP2S an SMA socket, used for monitoring of the
  TCMs PP2S timing signal and for BS testing

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GPSTM Function
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/standby indicator
ACTIVE
GPSAIM
Indication of searching for satellite
Indication of IPPS phase exceeding 800ns
1PPSAIM
Fault indicator
AIM
Reset key
R
S
T
16CHIP output
CLK
Power switch
PWR
RS232
CONTROL
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The End