Zxc10 bscb product description

Product Type Technical Proposal
ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. I
ZXC10 BSCB Product
Description

ZXC10 BSCB Product Description
ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. I
Version Date Author Approved By Remarks
V1.0 2005-12-31 Zhu Yx Not open to the Third Party
2006-05-22 Zhu Yx
Update description of IBB,
IPCF, SPCF and MP; Update
complied standards; Add
description of some indices with
British measurement.
2008-2-21 Zhu Yx Huang Xa
Update description of EV-DO,
such as reference model,
standard complied, handoff, and
VOIP/VT
2010-02-04 Li Chy
Update Standard Complied and
System Architecture
2010-03-16 Li Chy
Modify Chapter 2.2 and
Dimensions
2010-07-12
Li Chy
Liang Ming
Modify Chapter 4
© 2011 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be
disclosed or used without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document
is subjected to change without notice.

ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. II
TABLE OF CONTENTS
1 Overview ..................................................................................................................... 1
1.1 Background.................................................................................................................. 1
1.1.1 3G System Overview ................................................................................................... 1
1.1.2 Overview of the CDMA2000 All-IP Network ................................................................ 1
1.1.3 Introduction to the ZXC10 BSSB ................................................................................. 2
1.2 Position of ZXC10 BSCB in a Network........................................................................ 2
1.2.1 CDMA2000 1X Network Architecture .......................................................................... 2
1.2.2 Interfaces of BSCB in the CDMA2000 1X Network..................................................... 3
1.2.3 Model of CDMA2000 1xEV-DO Rev.A Radio Access Network................................... 5
1.2.4 Interfaces of the BSCB in the CDMA2000 1xEV-DO Rev.A Network ......................... 6
2 Highlight Features...................................................................................................... 9
2.1 Leading All-IP Network Solution .................................................................................. 9
2.2 Powerful Data Processing Capabilities......................................................................10
2.3 Resource Sharing ......................................................................................................10
2.4 Integrated Service Support Capabilities with ZTE Characteristics............................10
2.5 Advancement.............................................................................................................11
2.6 Comprehensive Functions.........................................................................................11
2.7 Compatibility ..............................................................................................................11
2.8 High Reliability ...........................................................................................................12
2.9 Flexible Configuration ................................................................................................12
3 Functionality.............................................................................................................14
3.1 Mobility Management.................................................................................................14
3.2 Authentication and Encryption...................................................................................14
3.3 Terrestrial Circuit Management .................................................................................14
3.4 Power Control ............................................................................................................14
3.4.1 Power Control for CDMA2000 1x ..............................................................................14
3.4.2 Power Control for 1xEV-DO.......................................................................................15
3.5 Handoff Control..........................................................................................................15
3.5.1 CDMA2000 1X Handoff Control ................................................................................15
3.5.2 1xEV-DO Handoff Control .........................................................................................16
3.6 Operation and Maintenance Management ................................................................16
3.7 Supporting vocoder mode..........................................................................................17
3.8 Supporting TrFO/RTO ...............................................................................................17
3.9 Voice Service Function ..............................................................................................17
3.10 1X Packet Data Service Functions ............................................................................17
3.11 1xEV-DO Data Service..............................................................................................17
3.12 Supplementary Services............................................................................................18
3.13 Short Message Service..............................................................................................18
3.14 Circuit Data Service Functions ..................................................................................18
3.15 Concurrent Service ....................................................................................................18
3.16 Broadcast/Multicast Service ......................................................................................18
3.17 Test Call.....................................................................................................................19
3.18 Support V5 Interface..................................................................................................19
3.19 4GV-NB (EVRC_B)....................................................................................................19
3.20 Support Private Network Functions ...........................................................................19
3.21 Push To Talk (PTT) Service ......................................................................................19
3.22 Location Services ......................................................................................................19
3.23 Wireless Public Phone...............................................................................................19
3.24 VoIP (with QOS) ........................................................................................................20
3.25 VT (with QoS) ............................................................................................................20

ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. III
4 System Architecture ................................................................................................21
4.1 System Structure of BSCB ........................................................................................21
4.2 Level 1 Switching Subsystem(BPSN)........................................................................23
4.2.1 Overview....................................................................................................................23
4.2.2 Working Principle.......................................................................................................23
4.2.3 Hardware Structure....................................................................................................23
4.3 Resource Subsystem (BUSN/BGSN)........................................................................26
4.3.1 Overview....................................................................................................................26
4.4 Control SubSystem (BCTC).......................................................................................35
4.4.1 Overview....................................................................................................................35
4.4.2 Working Principle.......................................................................................................35
4.4.4 Integrated Clock Module (ICM)..................................................................................40
4.4.5 Universal Interface Module (UIMC) ...........................................................................41
4.5 Clock Subsystem .......................................................................................................41
4.6 Power Distribution Subsystem...................................................................................42
4.6.1 Overview....................................................................................................................42
4.6.2 Power Distributor (PWRD).........................................................................................42
5 Technical Specifications .........................................................................................43
5.1 Running Environment Indices....................................................................................43
5.1.1 Dimensions ................................................................................................................43
5.1.2 Gross Equipment Weight and Ground Bearing Capacity of the Equipment Room...43
5.1.3 Working Voltage ........................................................................................................43
5.1.4 Power Consumption ..................................................................................................43
5.1.5 Grounding Requirement ............................................................................................44
5.1.6 Temperature and Humidity ........................................................................................44
5.2 Performance Indices..................................................................................................44
5.2.1 Interface Indices ........................................................................................................44
5.2.2 Capacity Indices ........................................................................................................45
5.2.3 Clock Indices .............................................................................................................45
5.2.4 Reliability Indices .......................................................................................................46
6 Operation and Maintenance ....................................................................................47
6.1 Overview....................................................................................................................47
6.2 Function Description of OMM ....................................................................................47
6.3 Remote OMM ............................................................................................................48
6.4 Networking Modes of OMC........................................................................................49
7 Appendix A: Standard Complied ............................................................................51
7.1 Primary Standards .....................................................................................................51
7.2 Lightning Protection ...................................................................................................53
7.3 Safety.........................................................................................................................54
7.4 EMC...........................................................................................................................54
7.5 Environment...............................................................................................................55
8 Appendix B: Abbreviation ......................................................................................... 1

ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. IV
FIGURES
Figure 1 Typical Network Structure of the 3GPP2 All-IP Network in LMSD Step-2 .................... 3
Figure 2 Interfaces of BSCB in the CDMA2000 1X Network ....................................................... 4
Figure 3 Model of CDMA2000 1xEV-DO Rev.A Radio Access Network..................................... 6
Figure 4 Reference Model of CDMA2000 1xEV-DO Rev.A Network Interface ........................... 7
Figure 5 General Structure of a BSC Uniform Platform Network...............................................21
Figure 6 Multiple Services Mapping...........................................................................................22
Figure 7 Working Principle of Level-1 Switching Subsystem.....................................................23
Figure 8 Level-1 Switching Shelf................................................................................................24
Figure 9 Slots for Resource Shelf Boards..................................................................................26
Figure 10 BCTC Working Principle ..............................................................................................35
Figure 11 Control Shelf (CLKG configured).................................................................................37
Figure 12 Control Shelf f (ICM configured) ..................................................................................38
Figure 13 Color Picture of BSCB Rack ........................................................................................43
Figure 14 Architecture of OMM....................................................................................................47
Figure 15 Networking Modes of remote OMM .............................................................................49
Figure 16 3-Layer Networking Structure of the OMC...................................................................49
Figure 17 2-Layer Networking Structure of the OMC...................................................................50
TABLES
Table 1 Temperature and Humidity Requirements...................................................................44
Table 2 abbreviation ................................................................................................................... 1

ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. 1
1 Overview
1.1 Background
1.1.1 3G System Overview
With the fast growth of wireless services and the rapid expansion of Internet services,
the wireless communication system has to meet increasing demands for system
capacity, data transmission rate and strong support for diverse services. The 3G mobile
communication system (IMT2000) draws the attention of the whole industry. The major
feature of 3G mobile communication system is the support of broadband service,
especially the multimedia data service efficiently using frequency spectrum. The 3G
system is designed to provide a larger system capacity and better communication quality
than 2G systems, implement seamless roaming around the world, and provide
subscribers with multiple services.
Mainstream technical standards for the 3G are CDMA2000, WCDMA and TD-SCDMA.
The CDMA2000 adopts the spread spectrum rate of 1 x 1.2288Mcps. A single carrier
occupies 1.25 MHz bandwidth. It adopts DS spread spectrum technology. The
CDMA2000 system is also called CDMA2000 1X. In addition, the 1xEV-DO Rev.A,
which serves as an enhanced standard supplemental to IS2000, supports data
transmission up to 3.1Mbps in a bandwidth of 1.25 MHz. For the 1xEV-DO Rev.B, which
adopts multi-carrier modulation technology, the spread spectrum rate is 3x/7x/15x
1.2288Mcps, respectively occupies 5/10/20 MHz bandwidth, the highest rate reaches
14.7 Mbps/34.3 Mbps/73.5 Mbps on the forward link and 5.4 Mbps/12.6 Mbps/27 Mbps
on the reverse link (with 6850 chip).
1.1.2 Overview of the CDMA2000 All-IP Network
The evolution from traditional networks to All-IP networks helps network builders and
operators offer more flexible service platform functions at lower costs. All-IP networks,
when integrated with 3G wireless access technologies, enable provisioning of
multimedia services over IP (including VoIP), giving network builders and operators
competitive edge.
The overall structure of the CDMA2000 All-IP network consists of the radio access
network and the core network. The evolution of the core network is independent from
that of the radio access network.
The CDMA2000 network evolves to All-IP network in several phases: Phase-0, Phase-1,
Phase-2 and Phase-3.
1 Phase-0 is a traditional network based on circuit switching. The access network is
based on IOS 4.x, the air interface is based on cdma2000 and the core network is
based on TIA/EIA-41.

2 Since Phase-1, the core network separates from the access network, forming
independent signaling layer and bearer layer. The access network signaling is
transmitted over IP.
3 Phase-2 corresponds to the LMSD (Legacy MS Domain) phase, which requires the
IP network to support traditional terminal services and provide new service functions
(such as TrFO/RTO) for users using new terminals.
4 Phase-3 corresponds to the MMD phase, and is the end point of the evolution to All-
IP. In this phase, the air interface based on IP is implemented and finally IP-based
transmission is realized throughout the network.
Such a way of phased and independent evolution offers flexibility to operators, and
better supports the network transition policy of the traditional telecom operators.
1.1.3 Introduction to the ZXC10 BSSB
It is foreseeable that the multimedia information such as voice, data and video will be
integrated into the IP network architecture, as are a consensus of the industry and a
mega-trend of the telecommunication network. In response to the technical development
trend, the ZXC10 BSSB has been developed on the basis of the IP platform. The ZXC10
BSSB consists of the ZXC10 BSCB and a series of BTSs. The ZXC10 BSSB features
advanced and future-proof technology, high integration, large capacity and full ranges of
product series. The ZXC10 BSSB can support the all the existing standards for the
CDMA2000 1X and 1xEV-DO family, and it has supported the function of the
CDMA2000 All-IP network in the LMSD phase, and supports the smooth evolution to the
next generation ALL-IP network.
1.2 Position of ZXC10 BSCB in a Network
The ZXC10 BSCB is a new-generation product designed basing on the 3GPP2 series
standard protocols and the All-IP platform structure. As an important part of the
CDMA2000 1X/1xEV-DO system, it provides the BSC (Base Station Controller) and PCF
(Packet Control Function Subsystem) function in the CDMA2000 radio access network
(RAN).
The ZXC10 BSCB can support CDMA2000 1X and 1xEV-DO Rev.A simultaneously on
the same platform, and support mixed insertion of the 1X and 1xEV-DO Rev.A. This
system is compatible with IS-95 backward, and can be smoothly upgraded to
CDMA2000 1xEV-DO Rev.B.
The ZXC10 BSCB already supports the functions of the CDMA2000 All-IP network in the
LMSD phase, IOS5.0, the separation of signaling from bearer, and the A1p/A2p
interface. The IP transmission technology can be adopted to access it to the
CDMA2000 core network that implements LMSD (Legacy Mobile Station Domain).
Note: The BSC and BSCB mentioned in this document refer to ZXC10 BSCB.
1.2.1 CDMA2000 1X Network Architecture
Figure 1 shows a typical CDMA20001X All-IP network in the LMSD phase.

xx 39
MSCe
MGW
zz
yy
PSTN
14
13
34
MAP
TIA / EIA- 41
MSCe
HLRe SCPe
A1
Illustration:
Signaling flow
Bearing service
flow
MRFP
internet
AAA
A1p
A2p
MS
MS
Um
BSC/PCFAbis
BTS
BTS
A2
RAN
A10/A 11
PDSN
A10/A11
BSC / PCF
(A interface)
Abis
BTS
BTS
RAN
MRFP MGW
(Ap interface)
Figure 1 Typical Network Structure of the 3GPP2 All-IP Network in LMSD Step-2
The overall network architecture of the All-IP network in the LMSD phase consists of the
radio access network and the core network, which are independent of each other.
 Radio Access Network (RAN)
Located between the MS (Mobile Station) and the CN (Core Network), the RAN is
responsible for processing radio signals, terminating radio protocols, and
connecting the MS with the core network. It consists of two parts, BSC/PCF
(generally referred to as BSC) and BTS. In the CDMA 2000 RAN, the BSC is the
control part in the BSS (Base Station System) to implement functions, such as call
processing, service selection, resource allocation, background monitoring and BTS
(Base Station Transceiver) access.
 Core network
Core network performs the mobility management, network-side authentication and
interface of public networks. The core network consists of the CS (Circuit Switching)
domain and the PS (Packet Switching) domain: The CS network consists of NE
such as MSCe, MGW, MRFP, SGW, SCPe and HLRe; the PS core network
consists of PDSN (Packet Data Service Node) and AAA. The CS supports two
transmission technologies, IP and TDM, to implement the access of the BSS. The
CS core network can interwork with the TIA/EIA/IS-41 and GSM MAP networks, as
well as the fixed PSTN.
1.2.2 Interfaces of BSCB in the CDMA2000 1X Network
Figure 2 shows the BSCB interface in the All-IP network of the CDMA2000 1X LMSD
phase. The BSC is connected to the BTS via the Abis interface, to the MSCe/MGW via
the A1p/A2p or A1/A2 interface, and to the PCF via the A8/A9 interface. The PCF is

connected to the PDSN equipment via the A10/A11 interface. BSCs are connected with
each other via the A3/A7 interface.
A1/ A1p A2/A2p
MSCe
A3(Service )
Destination BSS
A7 (Signaling)
A3 (Signaling)
BTS
BTS
PCF PDSN
A8 (Service)
A9 (Signaling)
BSS
A interface
Reference point
A interface
Reference point
A 10 (Service)
MGW
ZXC10 BSCB
A11 (Signaling)
ZXC10 BSCB
Figure 2 Interfaces of BSCB in the CDMA2000 1X Network
The external interfaces of the BSCB are standard ones, and the interfaces between
BSSB and MSCe/MGW, PDSN and PCF meet the CDMA2000 standard interface
specification; the interface between the BSC and the BTS is the user-defined Abis
interface.
BSCB supports the IOS5.0 protocol, and the A1p and A2p interfaces based on the IP
transmission technology, through which it can be accessed to the MSCe/MGW.
Meanwhile, the BSCB is compatible with the IOS4.* backwards, and provides the A1
and A2 interfaces to access it to the MSCe/MGW with the TDM transmission technology.
However, for the same BSCB equipment, it can be accessed to MSCe/MGW in only one
mode (IP or TDM).
 Alp interface: When BSC is accessed to MSCe in the IP transmission mode, the
signaling interface between the BSC and the MSCe is the A1p interface. The A1p
interface bears the signaling messages related to call processing, mobility
management, radio resource management, authentication and encryption.
 Al2p interface: When BSC is accessed to MGW in the IP transmission mode, the
voice bearing service interface between the BSC and the MGW is the A2p interface.
 Al interface: When the BSC is connected to the MSCe over TDM, the signaling
interface between the BSC and the MSCe is the A1 interface. The A1 interface
bears the signaling messages related to call processing, mobility management,
radio resource management, authentication and encryption.

 A2 interface: When the BSC is connected to the MGW over TDM, the voice bearing
service interface between the BSC and the MGW is the A2 interface. It bears the
64/56K PCM (Pulse Code Modulation) data between the SDU
(Selection/Distribution Unit) at the BTS side and the switching network at the MSC
side.
 A3 interface: Support the inter-BSS soft handoff (BSC interconnection) when the
mobile station is in the traffic channel state. It is divided into two parts: the A3
signaling interface and the A3 traffic interface.
 A7 interface: Support the inter-BSS handoff when the mobile station is not
controlled in the traffic channel state and supports the control flow when the mobile
station needs to establish the new traffic for inter-BSS soft handoff.
 A8 Interface: Bear the data between BSS and PCF.
 A9 interface: Bear the signaling transmission between BSS and PCF, and maintain
the A8 interface between BSS and PCF.
 A10/A11 interface: Bear the transmission of signaling and data between PCF and
PDSN for maintaining the BSS-PCF A10 connection. The A10 interface bears data
while the A11 interface bearing signaling.
 Abis interface: The Abis protocol is used for the interfaces between the BSC and
the BTS. It consists of two parts on the application layer: Control part (Abisc) and
traffic part (Abist), the former converts the Um interface control channel signaling
and the latter converts the control over the traffic channel.
1.2.3 Model of CDMA2000 1xEV-DO Rev.A Radio Access Network
The reference model for the CDMA2000 1xEV-DO Rev.A radio access network is shown
in Figure 3.

Figure 3 Model of CDMA2000 1xEV-DO Rev.A Radio Access Network
The CDMA2000 1xEV-DO Rev.A system consists of Access Terminal (AT), Radio
Access Network (RAN) and core network.
 RAN
RAN provides the radio bearer between the core network and AT, responsible for
establishing, maintaining and releasing radio channels, to manage the radio
resources and mobility. RAN consists of such functional entities as Access Network,
Packet Control Function (PCF) and Access Network AAA.
The AN consists of BSC and BTS. AN is a kind of network equipment that provides
data connections between the packet network and the access terminal, to
implement the BTS transceiving, call control and mobility management.
AN-AAA is a logical entity for the access network to implement access
authentication and user authentication. It exchanges the parameters and results for
access authentication with AN through the A12 interface.
PCF and AN jointly implement the radio channel control function related to the
packet data service. In the specific implementation of BSCB, PCF is configured
together with BSC, and the A8/A9 interface is the internal interface for AN/PCF.
PCF communicates with PDSN through the A10/A11 interface.
 Core network
The core network consists of packet core network and switching core network. The
PS core network includes such functional entities as PDSN and AAA; the switching
core network includes MSCe.
 AT
AT is a device providing data connections for users. It can be connected to a
computing device (such as a PC), or serve as an independent data device (such as
mobile phone).
1.2.4 Interfaces of the BSCB in the CDMA2000 1xEV-DO Rev.A Network
In the CDMA2000 1xEV-DO Rev.A network, the BSCB interface is shown in Figure 4.
The external interfaces of the BSCB are standard ones, and the interfaces between AN
and MSCe/MGW, PDSN, PCF and other ANs meet the standard interface specification
3GPP2 A.S0008; the interface between the BSC and the BTS is the user-defined Abis
interface.

AT
Source
AN
PCF
Target
AN
PDSN
Air
interface A8
A9
A10
A11
AN AAA
A1
3
A1
6
A1
7 A1
8
A1
9
A1
2
BSC
User data
connection
Signaling
connection
Figure 4 Reference Model of CDMA2000 1xEV-DO Rev.A Network Interface
 Abis Interface: The Abis protocol is an interface protocol between the BSC and BTS.
It contains two parts in the application layer: control part (Abisc) and service part
(Abist). The control part converts the Um interface control channel signaling, and
the service part controls the traffic service channel.
 A8/A9 interface: It is used to bear the signaling and data between AN and PCF. The
A9 interface bears signaling, used for maintaining the A8 data connection between
AN and PCF.
 A10/A11 interface: It bears the signaling and data between PCF and PDSN for
maintaining the A10 data connection. The A11 interface bears signaling.
 A12 interface: It connects the AN to the AN AAA for signaling transmission only.
This interface implements the AT terminal access authentication function at the AN
level. After the authentication of the MS/AT access is successful, the AN-AAA
returns MNID to AN for the interface between A8/A9 and A10/A11. The A12
interface uses the RADIUS protocol (Remote Authentication Dial-In User Service).
 A13 interface: It is used to support exchanging information related to this AT
between the source AN and the destination AN when AT is roaming.
 A16 interface: It uses the signaling message to deliver the AT’s active connection
status information between the source AN and the target AN to implement hard
handoff.
 A17 interface: It is used to deliver the signaling message between the source AN
and the target AN to assign the target AN resources required to implement soft

handoff. Besides, the A17 interface can deliver the control channel message of the
source AN to the target AN.
 A18 interface: It is used to deliver the AT’s media plane information between the
source AN and the target AN during soft handoff.
 A19 interface: It is used to deliver the handoff control information between the
source AN and the target AN during soft handoff.

2 Highlight Features
As an upscale, high performance and forward-looking platform, the All-IP structure
based BSCB can merge into the future All-IP networks and meet various demands of the
1X, 1XEV-DO Rev 0/A/B), PTT and WMAN (Wireless Metropolitan Area Network)
access.
BSCB has the following features:
2.1 Leading All-IP Network Solution
All-IP technologies are the trend of network development. ZTE is the advocate and front-
runner of All-IP technologies. ZTE’s All-IP network solution includes All-IP equipment
and All-IP networking as follows.
 All-IP equipment
i Based on the All-IP architecture, ZTE’s BSS not only meets the demands of
the future network and service development, but supports smooth upgrade to
the All-IP network in the IMS/MMD domain.
ii The development trend of the industry is providing All-IP based equipment,
with mature accessories and improved supply chain. ZTE’s BSS in the All-IP
structure copes with the industry development direction. Owing to the long
equipment lifecycle, it is able to help the operators reduce future expansion
costs and maintenance costs.
 All-IP networking
iii External interface: As its external interfaces are all based on IP, ZTE’s BSS
supports All-IP networking without the need to make special conversion for
these interfaces.
iv Network transmission: As intra-BSS switching and all internal processings are
done on the IP level, ZTE’s BSS supports All-IP network transmission without
the need to make internal format conversion. It has the industry-recognized
highest transmission efficiency.
v QoS: ZTE’BSS completely achieves IP-based QoS.
vi Ap interface: ZTE is the first company in the world to provide the standard Ap
interface (based on 3GPP2 IOS5.0 Protocol) and to put the Ap interface into
global markets for commercial use. The adoption of the Ap interface can
greatly slash the operator’s construction costs (CAPEX) and operating costs
(OPEX). It has the following advantages over the A interface:
 Saves 80% transmission bandwidth between the BSC and the MGW.
 Saves 30% to 50% vocoders.
 Provides higher voice quality.

 Supports Ethernet transmission to reduce the cost.
 Helps the existing network evolve into the All-IP network in the IMS/MMD
domain more smoothly.
2.2 Powerful Data Processing Capabilities
 The continuous growth of services such as packet data and VoIP has imposed
increasingly high requirements on the BSC’s data processing capabilities. ZTE’s
BSC supports a maximum of 6 Gbps data throughput, keeping ahead in the industry.
 ZTE’s BSC supports voice service capacities of up to 50,000 Erl, keeping ahead in
the industry.
 One BSC supports both 1X and EV-DO services.
2.3 Resource Sharing
ZTE’BSS has a powerful capacity of resource sharing as follows:
 It supports sharing of full-BSC vocoder, selector, PCF, and IWF resources.
 1X and EV-DO systems share the Abis interface bandwidth to implement complete
load sharing, streamline the network architecture, and reduce transmission
investment.
 The BSC shares the same hardware platform with the core network. It supports
smooth evolution and minimizes the users’ investment.
2.4 Integrated Service Support Capabilities with ZTE
Characteristics
 ZTE CDMA-based GoTa service provides professional trunking function, supports
PAMR and PMR operation, and offers the users with new profit model and profit
margin.
 Coupled with the MSS and the PDSS, ZTE’s BSS provides abundant service types
including voice call, packet data call at rates of up to 307.2 kbps, concurrent
services of voice and data, circuit data services (asynchronous data and G3 fax),
supplemental services and short messages. It also provides the EV-DO Rev.A
solution and the EV-DO Rev.B solution, the EV-DO Rev.A solution supports packet
data call with the highest rate reaching 3.1 Mbps on the forward link and 1.8 Mbps
on the reverse link, suitable for the delay-sensitive applications with symmetric data
rates, for instance, VoIP, wireless games, and video telephony. The EV-DO Rev.B
solution supports packet data call with the highest rate reaching 14.7 Mbps on the

forward link and 5.4 Mbps on the reverse link by using the CSM6850 chip and the
3i-carrier bundling technology. Besides, ZTE’s BSS supports location services, PTT
services and other featured services with differential advantages. All these services
help the operators not only attract more user groups, but also boost their overall
network competitiveness, and generate more revenues.
 ZTE broadband BSC and the broadband BTS form a future-proof integrated service
support platform.
2.5 Advancement
The system adopts lots of advanced designs and patent technologies:
 Adopts the next generation communication platform: High-performance and
prospective All-IP platform;
 With the powerful system hot-swappable function supported by all the boards;
 With advanced processing system in the distribution mode;
 With powerful online upgrading capability (including logics, MCU program, BOOT
program and FLASH files) to facilitate the maintenance.
2.6 Comprehensive Functions
The system provides the following comprehensive functions to meet the actual
commercial demands:
 Provides integrated primary power supply to realize -48V direct supply;
 Provides integrated built-in SDH (Synchronous Digital Hierarchy);
 Supports integrated environment monitoring;
 Supports the complete software/hardware version management system.
2.7 Compatibility
Compatibility of the previous/future systems is taken into full account during system
design:
 Support 1X and IxEV-DO (including EV-DO Release 0 and EV-DO Rev.A) on the
same platform, and support mixed insertion of their boards.
 Support smooth upgrading to the 1xEV-DO Rev.B system;

 Support smooth upgrading to the later All-IP network.
 Compatible with the IS-95 system.
2.8 High Reliability
High reliability is achieved on the basis of reliable designs:
 All the main control boards support the 1+1 backup function;
 All the key boards, such as the Abis link and CLKG, whose failure may incur system
interruption, support the 1+1 backup mode;
 Provides system redundancy of the vocoder elements, selection elements and PCF
elements in the form of resource pool;
 Supports payload sharing and link backup of the Abis interface communications and
the fiber networking backup function;
 Eliminates the single point faults and adopts the error-tolerance design of the
software to improve system reliability;
 The design meets the high/low temperature condition for system running and
relative standard of the communication products; comply to ETSI EN 300 019
Environmental conditions and Environmental tests for telecommunications
equipment;
 The design meets the EMC (Electronic Magnetic Compatibility) condition for system
running and relative standard of the communication products; comply to EN 300
386 Electromagnetic compatibility and Radio spectrum Matters (ERM);
Telecommunication network equipment; ElectroMagnetic Compatibility (EMC)
requirements ;
 The design meets the installation condition.
2.9 Flexible Configuration
The BSCB system is designed with multiple interfaces and abundant board/module
components; therefore, it supports flexible configurations:
 Supports the configuration mode with a single shelf forming an office;
 Supports flexible configurations and interchangeable insertion of types of resource
boards according to the actual configuration;

 With the boards of different types and versions, it can satisfy diversified
configurations requirements;
 Widely adopts the sub-cards to ensure flexible configurations and easy extension
and upgrading, thus satisfying the requirements for better functional performance at
lower cost;
 Sets the quantity of the system interfaces/ports: Adds/reduces the interfaces, such
as the FE/GE, E1/T1 and STM-1 (Synchronous Transfer Mode I) interfaces,
according to the customer configuration requirements;
 Supports configuration of the primary PWS cabinet (-48V DC);
 Supports configurations of the built-in SDH system

3 Functionality
The main functions of the BSCB are as follows:
3.1 Mobility Management
It provides mobility management, including registration (with specific authentication
process), SSD (Shared Secret Data) updating, terminal authentication, parameter
update, status query and message waiting indication.
3.2 Authentication and Encryption
 SSD update of control channel in 1X system;
 SSD update of traffic channel in 1X system;
 Specific authentication of control channel in 1X system;
 Specific authentication of traffic channel in 1X system;
 IS-856 authentication of the 1xEV-DO system
 AN-side access authentication of the 1xEV-DO system
 Support encryption services of voice, data and signaling.
3.3 Terrestrial Circuit Management
Including allocation/release, block/unblock and reset of the terrestrial circuit and reset of
the global system.
3.4 Power Control
3.4.1 Power Control for CDMA2000 1x
Power control can control the actual transmission power of the mobile phone or BTS in
radio transmission to keep it as low as possible, to reduce the power consumption of
mobile phone and BTS and the interference of the entire CDMA network.
Power control can be divided into forward power control and backward power control,
either of which is performed independently. The so-called backward power control refers
to the control of the mobile phone transmitting power, while forward power control refers
to the control of the BS transmitting power.

In a CDMA cellular mobile communication system, the following power control modes
are available:
 Backward open-loop power control
 Backward closed-loop power control
 Backward outer-loop power control
 Forward closed-loop power control
3.4.2 Power Control for 1xEV-DO
In 1xEV-DO system, as the forward power is constant, there is no problem of power
control. Power control is performed in the reverse channel, which involves open loop
power estimation and close loop power correction.
The reverse power control has a control over the output power of the accessed terminal
to ensure the quality of the reverse link while minimizing the interference and maximizing
the system capacity. Only when the average reverse link SNR of each user supports the
acceptable performance with the minimum overheads can the system achieves the
largest capacity.
The power control for 1xEV-DO falls into three parts:
 Open loop power control: The AT (Access Terminal) determines the condition of the
reverse link based on the receiving power of the forward pilot channel, and adjusts
the initial transmitting power to compensate the path loss;
 Close loop power control: The AT feedbacks the power control information in the
RPC (Reverse Power Control) based on the demodulation performance of the
reverse data, and adjusts the transmitting power of the reverse pilot;
 Outer loop power control: BSC adjusts the comparative threshold in the inner loop
power control based on the quality of the reverse link frame. AN judges the quality
of data frame according to the CRC check.
3.5 Handoff Control
3.5.1 CDMA2000 1X Handoff Control
 Softer handoff and soft handoff: BSC supports up to 6-way softer handoff. BSC
supports up to 6-way soft/ softer handoff;
 Inter-Frequency semi-soft handoff at boundary of different carriers: The Inter-
Frequency semi-soft handoff between borders with different carrier frequencies
includes three ways: handoff, hand-down and MS auxiliary inter-frequency semi-soft

handoff. For the IS95A mobile phones, the BS auxiliary inter-frequency handoff
algorithm is supported; for the IS95B mobile phones and later versions, the
candidate pilot search auxiliary handoff algorithm is supported; for the IS95B mobile
phones and later versions, hard handoff
 Soft handoff between BSCBs: FCH (Fundamental Channel) soft handoff between
the interconnected BSCBs, SCH (Supplemental Channel) soft handoff between the
interconnected BSCBs;
 Inter-BSCB hard handoff;
 Intra-BSCB Access handoff;
 Inter-BSCB Access handoff ;
 Handoff between the 1X network and the 1xEV-DO network.
3.5.2 1xEV-DO Handoff Control
 Idle handoff: Supports of idle handoff of AT cross cell, BTS, BSC/PCF and PDSN.
 Soft handoff plus and softer handoff plus
 Soft handoff and softer handoff minus
 Forward virtual handoff
 A13 handoff between ANs (idle handoff)
 Cross-subnet handoff inside AN
 Idle handoff between the 1X network and the 1xEV-DO network
 Data service handoff between 1X and 1xEV-DO in the active state
 Inter-AN hard handoff (based on A16 interface)
 Inter-AN soft handoff (based on A17/A18/A19 interface)
3.6 Operation and Maintenance Management
Including version download, data configuration and synchronization, alarm and
diagnosis test.

3.7 Supporting vocoder mode
Supports the QCELP 8K, QCELP 13K, 8K EVRC and 4GV-NB modes.
3.8 Supporting TrFO/RTO
TrFO/RTO is one of the functions of the CDMA2000 All-IP network in the LMSD phase.
TrFO (Transcoder Free Operation) means that two mobile stations have the network
capability to make the MS-MS call with the same encoding/decoding. It transmits
compressed voices in the bearer path of the packet network between traditional mobile
phones through saving the encoder/decoder. The transcoder is placed at the network
side, and associated with MGW. Through only transmitting the compressed voice, TrFO
improves its bandwidth utilization and reduces its loop delay. In addition, it can improve
the voice quality.
RTO (Remote Transcoder Operation) refers to the network capability that is incompatible
with the encoding/decoding at the end point. RTO tries to establish the bearer path with
the single code conversion to match the incompatible encoding/decoding. The ideal
compressed voice is transmitted between the end points. For the case where there is no
single code conversion used for establishing bearers, two Tandem code conversions are
needed, to search for a matching code between the two end points. RTO is a special
case of TrFO.
3.9 Voice Service Function
 Supports MS-originated call, MS-terminated call;
 MS release, MSC release and BSC release.
3.10 1X Packet Data Service Functions
RC4 is used in the forward of the air interface, with the maximum data rate of 307.2 kbps
supported; RC3 is used in the reverse, with the maximum data rate of 153.6 kbps
supported.
3.11 1xEV-DO Data Service
1xEV-DO Release 0 supports maximum data rate of 2.4Mbps in Forward link and
153.6kbps in Reverse link; 1xEV-DO Rev.A supports maximum 3.1Mbps in Forward link
and 1.8Mbps in Reverse link; 1xEV-DO Rev.B supports maximum 14.7 Mbps in Forward
link and 5.4 Mbps in Reverse link by using the CSM6850 chip and the 3-carriers
bounding tenology.

3.12 Supplementary Services
 Call Wait, three-way call, call transfer and call forward and so on;
 Tone DTMF (Dual Tone Multiple Frequency) Transfer: BSC will transfer DTMF tone
when BSC receives DTMF signaling from MS. BSC supports single Tone DTMF
and Burst DTMF.
3.13 Short Message Service
 Supports sending short message of MS through control channels;
 Supports receiving short message of MS through control channels;
 Supports sending short message of MS through traffic channels;
 Supports receiving short message of MS through traffic channels.
3.14 Circuit Data Service Functions
 The circuit data services, prescribed in the IS-707 standard, are provided at the rate
up to 14.4 Kbps;
 Supports direct access of bypass Modem to IP networks;
 Email receiving and sending, WWW service, FTP service; ATM, POS (Point of
Sales) and other bank charging terminal services support;
 PC fax, dial-up access, access to the private network VPN.
3.15 Concurrent Service
The concurrent data and voice services support the coexistence of the voice and data
services. That is, the concurrent transmission of data is possible when a voice
conversation is under way.
The concurrent service requires the use of Release A mobile phones.
3.16 Broadcast/Multicast Service
BCMCS (Broadcast-Multicast Service) is an application developed basing on the 1xEV-
DO system, used for providing the broadcast/multicast service for users. The purpose for
providing such a service is to improve the carrier/sector data efficacy of operators, for
example, if the 400 K BCMCS service is provided, the equivalent forward data traffic can
reach 12 M if there are 30 subscribers using the BCMCS under each carrier/sector.

3.17 Test Call
 MS originates markov, including 8K full rate, 8K variable rate, 13K full rate, 13K
variable rate;
 The OMM originates markov, including 8K full rate, 8K variable rate, 13K full rate,
13K variable rate, without need of MSC;
 Support MS-originated TDSO call;
 Support OMM-originated TDSO call.
3.18 Support V5 Interface
It implements direct interconnection of BSC and PSTN, supports the V5 interface, and
enables the V5 users to roam between BSCs.
3.19 4GV-NB (EVRC_B)
EVRC-B has the following advantages over other encoders:
1. Allowing the operators to give preference to voice quality or network capacity
2. Improving the network capacity by 40% through the combination of QLIC (including
pilot and traffic channel interference cancellation) and EVRC-B
Compared with other encoders, EVRC-B can greatly improve the network capacity and
thus reduce the users’ cost.
3.20 Support Private Network Functions
The private networks require unique voice encryption function to implement conversation
between users with different confidentiality levels, and to schedule the conversations.
3.21 Push To Talk (PTT) Service
Supports PTT service based on GOTA (Global Open Trunking Architecture) technology,
such as location management, group call, private call, call authority management, group
management, supplementary services, Dispatch Terminal Management, etc.
3.22 Location Services
Support PN4747 and GPSONE positioning modes.
3.23 Wireless Public Phone
Support wireless public phone based on polarity reversal charging.
Support wireless public phone based on pulse charging.

3.24 VoIP (with QOS)
VoIP refers to the voice service over the IP network. It is sensitive to delay. ZTE 1xEV-
DO Rev.A provides QoS features. It is able to provide applications with different
priorities, thus ensuring VoIP user experience. ZTE EV-DO Rev.A realizes EMPA, non
HDLC-like packet processing, and AN-Based ROHC compression described in 3GPP2
C.S0063-A and A.S0008-B to greatly improve the utilization of radio bandwidth.
3.25 VT (with QoS)
VT refers to the video phone service based on EV-DO Rev.A packet switch mode, that is,
realtime duplex audio/video mobile communication. VT service protocol stack contains
two planes:
Control plane: uses SIP/UDP/IP as call control signaling protocol.
Media plane: uses RTP/UDP/IP as voice and video transmission protocol.

4 System Architecture
4.1 System Structure of BSCB
The BSCB is an upscale radio access product based on the All-IP technology. The
general structure of an All-IP network is shown in Figure 5.
As shown in Figure 5, there are two levels of switching structure:
1 Level 1 switching: For an IP service, it can be the Ethernet switching or the direct
switching of the Crossbar+ network processor/network processor;
2 Level 2 switching: For an IP service, it can be the Ethernet switching.
Figure 5 General Structure of a BSC Uniform Platform Network
BSCB can access and process multiple traffic flows: Circuit, IP (Internet Protocol), ATM
(Asynchronous Transmission Mode) and HIRS (High-speed Interconnect Router
Subsystem) traffic flows, as shown in Figure 6.

Figure 6 Multiple Services Mapping
Mutual mapping is available between services:
 A circuit service can be converted into an IP service through code mapping and vice
versa;
 An HIRS service can be converted into an IP service through frame mapping and
vice versa;
 An ATM service can be converted into an IP service through cell mapping and vice
versa;
 An ATM service can be converted into a circuit service through IP indirect mapping
and vice versa;
 An HIRS service can be converted into a circuit service through IP indirect mapping
and vice versa;
 An HIRS service can be converted into an ATM service through IP indirect mapping
and vice versa.
As the control part of the BSSB, the BSCB provides the Abis interface with the BTS and
A interface with the MSC and PDSN. It executes the control, management and
maintenance for one or multiple BTSs attached to it, and provides service channels and
SS7 signaling interfaces to the MSC or MSCe/MGW.
The BSC adopts the 19-inch standard rack where four 8U standard plug-in boxes can be
supported. However, only three of them can be configured upon configuration of a GPS
plug-in box. Designed with the Compact PCI standard, universal BSC plug-in boxes
adopt the 8U space with boards being plugged from both the front and back sides. Each
plug-in box has 17 slots.
A BSC consists of the level-1 switching subsystem (BPSN), resource subsystem (BUSN),
control subsystem (BCTC) and Power Distribution subsystem.

4.2 Level 1 Switching Subsystem(BPSN)
4.2.1 Overview
As the core switching part in the BSC, Level 1 switching subsystem provides necessary
data transmission channels for functional entities internal/external the system, so as to
implement the exchange of multiple data (Timing, signaling, voice services and data
services) and provide different customers with corresponding QoS (Quality of Service)
function according to the service requirements.
4.2.2 Working Principle
Working principle of the Level-1 switching subsystem is shown in Figure 7.
PSN
PSN
GLI
GLI
GLI
GLI
UIM
UIM
HSSL
ControlStream FE
Control Bus
BUSN BUSN
Master MasterSlave Slave
ControlCenter
(CHUB)
4*FE
CLKG
CLKGClock
Figure 7 Working Principle of Level-1 Switching Subsystem
The level-1 switching subsystem adopts the high-speed switching of the backplanes.
The network processing modules will first decide the data forwarding route at the
physical interface, and then send the data to the switching network for exchange through
high-speed exchange and connection of the backplanes.
As the control bus inside the system that connects each module, the UIM switching
Ethernet bus completes distribution/collection of the routing information, system
configuration/maintenance/management, and transmission of the high-level protocol and
signaling data.
4.2.3 Hardware Structure
The level 1 switching subsystem (BPSN) is the core packet switching node of the BSC,
consisting of PSN4V/PSN2, GLIQV/GLI2, and UIMC/UIMC2 and BPSN backplane.

The functions of these boards are described below:
 GLIQV/GLI2
GLIQV/GLI2 is a cable interface board that belongs to Level 1 packet switching
subsystem. The board implements physical layer adaptation, IP packet table check,
fragmentation, forwarding and flow management, and enables other subsystems gain
access to Level 1 IP switching subsystem.
 UIMC/UIMC2
UIMC/UIMC2 used in the control subrack and Level 1 switching subrack implements
Ethernet switching of control flow message.
 PSN4V/PSN2
As a self-routing matrix switching system, PSN4V/PSN2 works with the queue engine on
the cable interface board to provide the switching function.
PSN4V/PSN2 of Level 1 switching subsystem implements packet data switching
between GLIQV/GLI2.
 BPSN backplane
The BPSN fulfills Ethernet switch in the control plane. The system receives clock from
CLKG/CLKD/ICM and transmit it to UIMC/UIMC2. UIMC/UIMC2 distributes the system
clock to each service slot in the BPSN through the BPSN backplane. In addition, the
BPSN backplane provides –48 V power.
For example, configurations of the level-1 switching shelves are shown in the following
Figure 8 (take the PSN and GLI for example):
Level-1 Switching Shelf (BPSN)
1 2 3 4 5 6 7 8 9 1
0
11 1
2
1
3
1
4
1
5
1
6
1
7
G
L
I
G
L
I
G
L
I
G
L
I
G
L
I
G
L
I
P
S
N
P
S
N
G
L
I
G
L
I
G
L
I
G
L
I
G
L
I
G
L
I
U
I
M
C
U
I
M
C
N
C
Figure 8 Level-1 Switching Shelf
Notes: NC indicates dummy panel. The PSN is the PSN4V/PSN2 and the GLI is
GLIQV/GLI2, unless otherwise specified.
4.2.3.1 Vitesse Packet Switch Network 40Gbit/s (PSN4V/PSN2)
Vitesse Packet Switch Network 40 Gbit/s (PSN4V/PSN2) board implements packet data
switch between line cards. PSN4V/PSN2 is a self-routing matrix switching system and
co-operates with GLIQV board to complete switching function.

Following are the functions of the PSN4V/PSN2 board.
 Provides 40 Gbit/s bidirectional user data switching capability.
 Implements 1+1 load sharing and supports changeover manually and changeover
via software.
 Provides two 10/100M Ethernet channels as control channels.
 Supports reading physical IDs such as rack ID, shelf ID and slot ID, and provides
version identification function.
4.2.3.2 Vitesse Quad GE GLI (GLIQV/GLI2)
Vitesse Quad GE GLI (GLIQV/GLI2) board is a line interface board of level-1 packet
switching subsystem, and implements physical layer adaptation, IP packet table search,
fragmentation, forwarding and traffic management.
1 GLIQV
Following are the functions of GLIQV board.
 Provides four GE ports (1+1 backup for each GE optical port) and backup of GE
ports with adjacent GLIQV boards.
 Provides 2.5 Gbit/s bidirectional wire-speed processing/forwarding and traffic
management ability.
 Provides active/standby Ethernet communication channel.
 Provides Ethernet control flow channel.
2 GLI2
Following are the functions of GLI2 board.
 Provides four GE ports (1+1 backup for each GE optical port) and backup of GE
ports with adjacent GLIQV boards.
 Provides 2.5 Gbit/s bidirectional wire-speed processing/forwarding and traffic
management ability.
 Provides active/standby Ethernet communication channel.
 Provides Ethernet control flow channel.
 Provides two 1,000M Ethernet media flow interfaces.
 Provides a 100M media-and-control transfer Ethernet interface.

 The Ingress and Egress systems provide respectively a debugging 232 serial port.
 Provides a RS485 interface to fulfill communication with the monitoring board.
4.2.3.3 Universal Interface Module (UIMC/UIMC2)
Refer to Section 4.3.2.5.
4.3 Resource Subsystem (BUSN/BGSN)
4.3.1 Overview
The Resource subsystem (BUSN/BGSN) provides the external interfaces of the BSC for
access process in various modes and processing of relative lower-level protocols. In
addition, it also provides types of resource processing modules to implement processing
of the radio protocols.
The resource subrack (BUSN/BGSN) is the smallest unit in BSC system resource
processing. It completes user plane processing. Multi-BUSNs/BGSNs can smoothly
expand capacity by interconnection via the BPSN. The resource subsystem includes the
BUSN/ BGSN backplane, UIMU/UIMU2 boards and various resource access processing
boards, such as DTB, SDTB, ABPM/ABPM2, IPI/IPI2, SIPI, INLP, IBBE/IBBE2,
HGM/HGM2, ABES/ABES2, SDU/SDU2, SPB/SPB2, VTCD and IWFB.
Among them, as the backplane of Universal Switching Network, BUSN supports the
mixed insertion of various service processing boards, which thus constructs the
universal service processing subsystem. BGSN is Gigabit universal service backplane
and supports the mixed insertion of large-traffic boards as well as the insertion of small-
traffic boards.
The resource subrack can be configured with several boards. Take the following board
combination for instance to explain the configuration of resource shelf.
Resource Shelf (BUSN/BGSN)
1 2 3 4 5 6 7 8 9 1
0
11 1
2
1
3
1
4
1
5
1
6
1
7
D
T
B
D
T
B
D
T
B
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F
E
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A
B
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A
B
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C
F
U
P
D
C
S
D
U
S
D
U
S
D
U
S
D
U
S
D
U
Figure 9 Slots for Resource Shelf Boards
4.3.2.1 IP Bearer Access Board (IPI/IPI2)
IP bearer Interface (IPI) board provides A2p interface between BSC and Media Gate
Way (MGW).

IPI2 is upgraded from IPI and has the same software function with it.
Following are the functions of the IPI/IPI2 board.
 Provides control flow Ethernet interface.
 Provides Ethernet data backup channel.
 Provides RS485 backup control channel interface.
 Implements 1+1 active/standby logic control.
 IPI provides four FE interfaces to connect the external network.
 IPI2 provides four external FE interfaces or one GE interface (optical or electrical).
4.3.2.2 Abis Processing Module (ABPM/ABPM2/ABPM3)
In BSC, ABPM (Abis processing unit) board is used in Abis interface co-processing. It
provides low speed link to complete the IP compression co-processing.
ABPM2 is upgraded from and has the same software function as ABPM.
Following are the functions of ABPM/ABPM2 board.
 Supports cUDP/PPP/ML-PPP processing.
 Supports at least 256 High-level Data Link Control (HDLC) protocols.
ABPM3 is the upgrade version of ABPM2. Besides the above basic functions of
ABPM/ABPM2 board, digital trunk is simultaneously added to the hardware and software
functions.
 ABPM3_B provides two 155 M STM-1 (Synchronous Transport Module, level 1)
standard optical interfaces, compatible with E1 and T1; equivalent to the function of
ABPM2+2xSDTBs;
 ABPM3_A provides 32xE1/T1 physical interfaces; equivalent to the function of
ABPM2+1xDTBs

4.3.2.3 Interface Board of PCF (IPCFE/IPCF2)
Interface of PCF by FE (IPCFE) board supports external packet network connection,
receives IP data from external network, differentiates and distributes IP data to the
corresponding internal functional boards.
IPCF2 is upgraded from IPCF and has the same software function with it.
Following are the function of IPCFE/IPCF2 board.
 Provides 1x100 M control flow Ethernet interface.
 Provides 1x100 M Ethernet data backup channel.
 IPCFE provides four external 100M Ethernet electrical interfaces, while IPCF2
delivers four external FE interface or one external GE interface (optical or electrical).
4.3.2.4 User plane of PCF (UPCF/UPCF2)
User Plane of PCF (UPCF) board processes PCF user plane protocols, supports PCF
data sequencing and processes some special protocols.
UPCF2 is upgraded from and has the same software function as UPCF. Since UPCF2
integrates functions of both UPCF and UPDC, UPDC2 is not individually provided.
Following are the functions of UPCF/UPCF2 board.
 Provides media flow Ethernet interfaces.
4.3.2.5 Universal Interface Module (UIM/UIM2/GUIM)
Universal Interface Module (UIM/UIM2) has two types:
 Universal Interface Module for Universal (UIMU)
 UIMU board consists of UIM motherboard and GEBASE1000_X Subcard
(GXS)
 UIMU board implements Ethernet Level-2 switching and CS domain timeslot
multiplexing/switching inside BUSN shelf, and manages BUSN shelf. UIMU

board provides external interfaces include GE optical interface and Ethernet
interfaces (4 FE interfaces).
 Universal Interface Module for Control (UIMC)
 UIMC board consists of UIM motherboard and GE Connect Subcard (GCS).
 UIMC board provides Ethernet Level-2 switching inside BCTC shelf and BPSN
shelf and manages the shelves.
Following are the functions of UIM board.
 Provides function to read cabinet ID, shelf ID, slot ID, equipment ID, backplane
version ID and backplane type ID.
 Provides MAC configuration, VLAN and broadcast packet control.
 Manages shelf and internally provides RS485 management interfaces.
 Receives drives and distributes system clocks inside shelf.
 UIMU board provides circuit switching function for resource shelves while UIMC
board does not.
 UIMU board provides one user plane GE optical interface for interconnection
between resource shelf and core switching unit. GE channel works in active/standby
mode for 1+1 backup of core switching unit.
 UIMU/UIMU2 provides two 24+2 exchange type HUB, one is control plane Ethernet
HUB, another is user plane Ethernet HUB.
 UIMC/UIMC2 board provides Ethernet interconnection for control plane and user
plane through its GCS subcards.
GUIM (Gigabit Universal Interface Unit) consists of GUIM mother board and CPU
subcards whose type is SCT_3G_85XX.
GUIM provides the following functions:
 Reading data such as rack No., shelf No., slot No., equipment No., backplane
version No., and backplane type No.;
 MAC (Media Access Control) configuration, VLAN, broadcast packet control;
 Management inside the shelf, offering RS485 management interface internally;
 System clock reception and driving distribution inside the shelf;
 Hundred and Gigabit Ethernet switching over control plane and media plane inside
the BGSN resource shelf, and narrowband link inside the shelf; offering external
cascade connection interface of resource shelf;
 Offering a 48FE+4GE switching HUB, dividing 48 interfaces into two switching
planes: one being the control plane Ethernet HUB, which provides the

interconnection of 19 FE interfaces and boards inside the resource shelf as well as
one 1000baseT Ethernet interface for the interconnection of CHUB inside the shelf
internally; and provides six control plane FE interfaces for the interconnection
between resource shelves or between resource shelf and CHUB externally; and the
other being the user plane Ethernet HUB, which provides 21 FEs internally for the
interconnection of resource shelves;
 Providing a 24GE+2*10GE switching HUB, offering 19 GE SerDes switch interfaces
for service slots; providing two sets of user plane active/standby GE optical
interfaces for the mutual connection between resource shelves or between resource
shelf and core switching unit; as well as two 10G optical interfaces for the
convergence or connection of resource shelves;
 1+1 (active/standby) logic control
4.3.2.6 Selection/Distribution Unit (SDU/SDU2/SDU3)
There are three Selector and Distributor Unit (SDU) boards in ZXC10 BSCB; Selector
and Distributor Unit (SDU) board and Selector, Distributor Unit2 (SDU2) board and
Distributor Unit3 (SDU3) board and. The differences between these boards are:
Subcard type of SDU board is SCT_3G_PPC755, subcard type of SDU2 board is
SCT_3G_85XX whereas subcard type of SDU3 board is SCT_3G_8548.
SDU/SDU2/SDU3 board processes wireless voice and data protocols, implements data
selection/multiplexing /demultiplexing, and completes Radio Link Protocol (RLP) and A8
interface protocol processing.
Following are the functions of the SDU/SDU2/SDU3 board.
 Provides four CPU subsystems that are mutually independent of one another (one
of them is the master).
 Provides four FE interfaces and supports Virtual Local Area Network (VLAN)
broadcast.
 Provides precise network clock for charging.
 Supports BCMCS service.
4.3.2.7 HIRS Gateway Module (HGM/HGM2)
HIRS Access and Handoff Gateway Module (HGM) is compatible with CDMA2000 1X
High-speed Interconnect Router Subsystem (HIRS) equipment, and provides Abis
access of HIRS BTS and all IP BSC. It also provides handoff between IP BSC and HIRS
BSC, IP BSC and IP BSC.
HGM2 is upgraded from HGM and has the same software functions with HGM.
Following are the functions of HGM/HGM2 board.

 Provides access ability of 8 x 8 M HW.
 Provides 4 media flow Ethernet interfaces.
 Supports HIRS protocol processing capability and implements protocol conversion
between HIRS and IP.
 Provides 256 HDLC channels.
4.3.2.8 Interface of BSC and BSC by Ethernet Board (IBBE)
Interface of BSC and BSC by Ethernet (IBBE) board provides A3/A7 and A13 interfaces
and processes bottom-layer protocols. It uses Ethernet as the bearer and implements
soft handoff interface between IP BSCs.
IBBE2 is upgraded from and has the same software function as IBBE.
Following are the functions of the IBBE/IBBE2 board.
 IBBE provides at most four external 100M Ethernet interfaces
 while IBBE2 delivers four external FE interfaces or one GE interface (optical or
electrical).
4.3.2.9 Digital Trunking Board (DTB)
Digital Trunk Board (DTB) implements conversion between E1/T1 signals and HW
signals, and multiplexes 32 E1s/T1s into eight 8 M HW signals. DTB sends eight 8 M
HW signals to corresponding protocol processing board via UIM after circuit switching.
The functions of DTB board are:
 Provides 32 E1/T1 interfaces.

 Transmits inter-office Channel Associated Signaling (CAS) and Common Channel
Signaling (CCS).
 Extracts 8 K synchronization clock from the line and sends it via clock cable to
CLKG board. CLKG board uses it as clock reference.
4.3.2.10 Sonet Digital Trunking Board (SDTB)
Sonet Digital Trunk Board (SDTB) provides 155 Mbps optical interfaces.
Following are the functions of the SDTB board.
 Provides one standard 155 Mbps optical interface, supports SDH and Sonet modes.
 Completes AU pointer processing and mapping/de-mapping of STM-1, STS-3 and
STS-3c signals.
 Supports Channel Associated Signaling (CAS) and Common Channel Signaling
(CCS).
 Provides sixteen 8 M HWs to adapt UIM board.
 Outputs two 8 kHz differential synchronization clock signals to CLKG board which
uses them as clock references.
 Communicates via FE interface with UIM board to transmit management, control
and software version information.
4.3.2.11 Voice Transcoder Card based on DSP (VTCD)
Voice Transcoder Card based on DSP (VTCD) is in the BSCB vocoder subsystem and
implements voice coding/decoding of CS domain.
VTCD supports Voice over IP (VOIP), rate adaptation and echo cancellation.
Following are the functions of VTCD board.
 Provides 100 M control flow Ethernet interface.
 Provides 100 M media flow Ethernet interface.
 Provides one RS485 backup control channel interface
 Provides access ability of 8 M HW.
 Provides vocoder functions with QCELP8K, QCELP13K and Enhanced
 Variable Rate Coder (EVRC) and provides optional echo cancellation function.

 Provides internal circuit switching function, and implements CS voice service
switching and free allocation of voice channels between output port and timeslots.
 Provides internal Ethernet switching function, and implements free allocation and
centralized output of data packets and media flows between voice processing chips.
4.3.2.12 Narrowband Signaling Processing Board (SPB/SPB2)
SPB/SPB2 implements signaling process, processes several SS7
HDLC links and protocols below MTP-2, it also provides V5 signaling process, supports
SS7 and V5 protocols simultaneously.
Following are the function of the SPB board.
 Provides SS7 access and processing.
 Supports V5 protocol process.
4.3.2.13 IP Narrowband Line Processor(INLP)
The INLP board is a logic board of SPB_2 physical board. It integrates 16 E1/T1 LIU and
Framer and supports E1/T1 mode as well as long and short line modes. The matching
resistance can be selected to configure by software in the transceiver chip: Under the E1
mode, supports 120 ohm and 75 ohm impedance configuration; Under the T1 mode,
supports 100 ohm impedance configuration
4.3.2.14 InterWorking Function Board (IWFB)
IWF Board (IWFB) is an interconnection board between networks to implement
asynchronous data service and G3 facsimile service.
Following are the functions of IWFB board.
 When configured in BSC, provides asynchronous data service or G3 facsimile
service.
 Provides timeslot circuit switching function (each board for 36 groups) and enables
timeslots free allocation between output port and internal processing boards to
transmit CS domain data.
 Provides 1x100 M control flow Ethernet interface.
 Provides 1x100 M media flow Ethernet interface.

4.3.2.15 Abis Ethernet Access (ABES/ABES2)
Abis Ethernet Access (ABES) board works as an IP processing board for Ethernet
access of Abis interface. It can work in active/standby mode or no standby mode.
ABES2 is upgraded from and has the same software function as ABES.
ABES/ABES2 board separates Abis data and signaling. Signaling is transferred to
BCTMP, CMP, SMP modules for further processing via control channel. As for Abis
media plane data, pseudo Network Address Transfer (pNAT) and interior capsulation
should be performed by ABES/ABES2, and then the data is forwarded within the
network element. Multi ABES/ABES2 boards can be coexisting in one BSCB.
Following are the functions of ABES/ABES2 board.
 ABES provides three FE interfaces to connect the external network. ABES2
provides four external FE interface or one external GE interface (optical or
electrical).
4.3.2.16 Signaling IP bearer Interface (SIPI)
SIPI board provides A1p interface between BSC and Mobile Switch Center emulation
(MSCe).
Following are the functions of the SIPI board.
 Provides at most four FE interfaces to connect the external network.

4.4 Control SubSystem (BCTC)
4.4.1 Overview
As the control core of the BSC, the control subsystem (BCTC) implements the
management and control of the entire system and generates types of clocks.
4.4.2 Working Principle
The structure of the control subsystem is shown in Figure 11.
IBB CLKG
CMP
CMP
OMP
OMP
UIM
UIM
F E
CLKG
8K、16M、PP2S
CHUB
OMM FE
Figure 10 BCTC Working Principle
 As the signaling switching center of the control subsystem, the UIM implements the
message exchange between modules and provides control Ethernet channels for
externally connecting the resource shelf ;
 The MP board is the communication and control center, and by the software
function, it falls into the CMP, SMP, OMP, RMP, DSMP, RPU, DOMP, DOBIMP,
and SPCF with the same hardware. The OMP module provides an OMM Ethernet
interface that is used for connecting with the background.
 As the control and maintenance center of the BSC, the CHUB implements
convergence and management of the control flows of the resource subsystem,
level-1 switching subsystem and control subsystem;
 As the clock unit of the BSC, the CLKG implements synchronization of the local NE
with that of the higher level and receipt/distribution of the GPS clock signals;
 There can be one or more control subsystems according to the user capacity of the
BSC, but each NE should have only one pair of OMPs configured.

The control subsystem (BCTC) completes the signaling processing of the BSC system,
including the CHUB, ICM/CLKG/CLKD, UIMC/UIMC2, MP/MP2 and BCTC backplane.
Upload various software to fulfill the following function modules on the MP/MP2 board:
1XCMP/APCMP/DOCMP/V5CMP/DSMP/RMP/SPCF/1XUMP/BCTMP/DOBICMP/EUMP.
The following describes functions of all boards and modules.
 CHUB
The CHUB is used to expand the distributed processing platform. One pair or multi-pairs
of CHUBs fulfill Ethernet Lay 2 switch of control flow message between boards.
 ICM/CLKG/CLKD
The CLKG refers to the clock reference 8 k frame synchronization signal from the DTB,
the 2 MHz/2 Mbits signal from the BITS or the 8 k clock signal from the GCM (PP2S/16
Chip), and synchronizes with the superior office. In addition, it provides 15 16.384MHz,
8KHz and PP2S clocks for the UIM/UIM2.
The CLKD is used to expand the clock system when there is over 15 shelves (including
BUSN, BCTC and BPSN).
The ICM replaces functions of GCM and CLKG.
 UIMC/UIMC2
The UIMC/UIMC2 is used to complete Ethernet switch of control flow message in the
BCTC and BPSN.
 1XCMP
The 1XCMP handles signaling on the MTP3 or above and 1x Release A call and handoff.
 APCMP
The APCMP handles signaling on the SUA or above and call signaling of Ap interface.
 DOCMP
The DOCMP handles 1xEV-DO call and handoff.
 V5CMP
The V5CMP handles call signaling of V5 interface.
 DSMP
The DSMP handles Layer 3 signaling and handoff originated by 1x Release A.
 RMP

The RMP manages system resources, such as vocoders, selectors, CICs and DSMPs.
 SPCF
The SPCF handles the packet service A9/A11 signaling.
 1xUMP
The 1xUMP integrates functions of CMP, RMP and DSMP and is used for debugging
and demonstration services.
 BCTMP
The BCTMP fulfills TCP termination. The retransmission agent process on the BCTMP
transmits signaling to the CMP in the mode of inter-board message and then handles
Abis signaling protocols.
 DOBICMP
The DOBICMP, used in EVDO (Rev.A) BCMCS, completes broadcast protocol
processing.
 EUMP
The EUMP, used in the MINI system, integrates functions of 1xUMP and DOCMP. Only
the MP2 supports this module.
 BCTC backplane
The BCTC backplane provides Ethernet access of 46x100 M +1x1000 M control flow. It
receives clock from the CLKG/CLKD/ICM and transmits clock to the UIMC/UIMC2. The
UIMC/UIMC2 distributes the system clock to all service slots of BCTC through the BCTC
backplane. In addition, it provides -48 V power for the BCTC.
For example, configurations of the control shelf are shown in the following Figure (CLKG
configured).
Resource Shelf (BUSN)
1 2 3 4 5 6 7 8 9 1
0
11 1
2
1
3
1
4
1
5
1
6
1
7
M
P
M
P
M
P
M
P
M
P
M
P
M
P
M
P
U
I
M
C
U
I
M
C
O
M
P
O
M
P
C
L
K
G
C
L
K
G
C
H
U
B
C
H
U
B
N
C
Figure 11 Control Shelf (CLKG configured)
For example, configurations of the control shelf are shown in the following Figure (ICM
configured).

Control Shelf (BCTC)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
M
P
2
M
P
2
M
P
2
M
P
2
M
P
2
M
P
2
M
P
2
M
P
2
U
I
M
C
U
I
M
C
O
M
P
2
O
M
P
2
I
C
M
I
C
M
C
H
U
B
C
H
U
B
N
C
Figure 12 Control Shelf f (ICM configured)
4.4.3.1 Main Processor (MP/MP2/MP3)
There are two Main Processor (MP) boards in ZXC10 BSCB; Main Processor (MP)
board, Main Processor2 (MP2) and Main Processor3 (MP3) board. The differences
between these boards are:
Subcard type of MP board is SCT_3G_PPC755, subcard type of MP2 board is
SCT_3G_85XX. whereas subcard type of MP3 board is SCT_3G_8548.
Following are the functions of the MP/MP2 board.
 Provides distributed processing of BSCB system. Connects various peripherals via
standard PCI bus to implement active/standby MP/MP2 changeover.
 One MP/MP2/MP3 board consists of two CPU processors called CPU subcards.
CPU subcards work mutually independent. If MP/MP2/MP3 board is pulled out,
CPU subcards will be notified by hardware signal to shift to standby mode.
 MP/MP2/MP3 board provides 1+1 backup, and load different software on CPU
subcards to perform different as functional modules.
4.4.3.2 Control Panel Ethernet Interconnection Board (CHUB/THUB)
In BSC, CHUB is used for the expansion of distributing processing platform. One pair or
several pairs of CHUBs can achieve the mutual communication of control plane between
service shelves. CHUB is connected with UIMC (backplane) inside the shelf through
1000 M electrical interface (backplane line connection).
Following are the functions of CHUB board.
 Provides external interfaces: 46 control plane Ethernet interfaces.
 Provides one 1000M control plane Ethernet interface through the rear board to
connect the UIMC module.
 Supports 1+1 active/standby function.
THUB also achieves the cascade connection of control plane. Compared with CHUB, it
can provide greater control plane communication bandwidth (at most 400Mbps). THUB

is mainly used for the control plane cascade connection of BGSN resource shelf, and
used together with BGSN.
THUB provides the following functions:
 External interface: 11 Trunk (4xFE) sets
 External interface: connect with the backplane and UIMC through 1000 M control
plane Ethernet interface
 1+1 active/standby
4.4.3.3 Clock Generator (CLKG)
CLOCK Generator (CLKG) board works in active/standby mode and uses 8 K frame
synchronization signal from DTB or SDTB board, 2 MHz or 2 Mb signal from BITS
system, and 8 K clock signal (PP2S and 16 CHIP) from GCM board as local clock
reference. CLKG board provides loss-of-reference alarm signal.
The functions of CLKG board are:
 Communicates with OMP/OMP2 board via RS485 bus.
 Selects clock reference source by NetNumen M3 (ZXC10 BSSB) configurations or
manually, supports shielding manual changeover via software setting. Manual
reference order is:
2Mbps1 -> 2Mbps2 -> 2MHz1 -> 2MHz2 -> 8K1 -> 8K2 ->8K3 -> NULL.
 Outputs fifteen 16.384 M, 8 K and PP2S clock signals to UIM.
 Supports Clock loss and input reference degradation judgment.
 Provides functions of Static Random Access Memory (SRAM)failure alarm, constant
temperature trough alarm, reference and output clock loss alarm, reference
degradation alarm, and reference frequency offset out-of-range alarm and PLL
phase discrimination failure alarm, which enables to determine CLKG board current
working status and locates the fault.
 Provides frequency adjustment knob, and adjusts Voltage-Controlled Crystal
Oscillator (VCXO) frequency.
4.4.3.4 CLOCK Driver (CLKD)
CLOCK Driver (CLKD) board adopts hot active/standby design. Active/standby CLKD
board receives the clock from active CLKG (CLKG clock is transferred via cable to the
UIM board and UIM board forwards the clock to CLKD via backplane.
The clocks include PP2S, 8K _16M and 16M and provide 15 sets of system clocks
(PP2S, 8K _16M and 16M) to resource subsystems via cable. Furthermore, this board

also provides 10 sets of clocks (32M, 8K _32M) to the boards in "T" network. It helps to
extend the clock output from CLKG.
Following are the functions of CLKD board.
 Active/standby switchover, command switchover, manual switchover, malfunction
switchover, reset switchover and so on.
 Communicates with console (OMP/OMP2) via control plane Ethernet.
 Receives PP2S, 16M_8K and 16M clocks from CLKG /ICM.
 Output 15 channels of 16M, 16M_8 K and PP2S clock signals to Universal Interface
Module (UIM). Frequency doubler generates 10 channels of 32M and 32M_8K and
sends them to "T" network.
 Clock input/output alarms are available. Working state and malfunction location can
be determined quickly according to these alarms.
 ID identification is available.
 Online download is available.
4.4.3.5 GPS Control Module (GCM)
GPS Control Module (GCM) receives GPS satellite signal or signals from Russia
GLONASS timing system (GNS) satellite. GCM boards work in a 1+1 backup mode,
occupy a 6U GCM shelf and adopt an independent Backplane of GCM (BGCM).
The functions of GCM board are:
 Receives signal from satellite system, extracts and generates 1PPS signal and
relevant navigation messages, and generates
 PP2S/16CHIP signal and relevant Time of Date (TOD) messages.
 Provides mutual backup of circuit clocks and GPS clock.
 Distributes 2 MHz and 8 KHz circuit clocks uniformly.
4.4.4 Integrated Clock Module (ICM)
Integrated CLK Module (ICM) provides synchronized clock, and realizing the functions of
BITS clock access, line clock extraction, clock synchronized phase lock and clock
distribution.
Following are the functions of the ICM board.
 ICM board communicates with main control board OMP/OMP2 via FE or RS485 bus.

 Active/standby changeover (command changeover, manual changeover, failure
changeover and reset changeover) is available.
 Manual reference clock changeover and manual active/standby changeover are
available.
 Manual reference selection sequence: Bps1 ® Bps2 ® Hz1 ® Hz2 ® 8K1® 8K2 ®
8K3 ® 8K4
 Modify the constant temperature slot crystal oscillator and the software to choose
level 1 or level 2 as the output reference clock.
 Powerful alarm report function helps to locate the problem in clock boards.
 There is a frequency tuning knob. When the old quartz of VCXO causes the central
frequency distortion, tuning is available.
 Provides 15 sets of system clocks (including PP2S, 8K and 16 M) for every
resource subsystems through cable transmission.
 Provides 10 sets of clocks (8 K and 3 2M) for boards in T network.
4.4.5 Universal Interface Module (UIMC)
Refer to Section 4.3.2.5.
4.5 Clock Subsystem
The clock subsystem synchronizes internal BSC system clocks.
It consists of the GPS Control Module (GCM), Clock Generator Back GCM (BGCM).
The board functions are described below.
 GCM
The GCM receives signals from satellite systems (GPS and GLONASS), and generates
1PPS signals and navigation messages. Then it generates PP2S, 16 CHIP and Time of
Date (TOD) messages using 1PPS signals as phase-locked reference clock inputs to
the BSC.
 CLKG
The CLKG synchronizes with the superior-level clocks by using 8K synchronous frame
signal clock reference from trunk boards, 2 MHz/2 Mb signal from BITS system, or 8 K
clock (PP2S even-second pulse and 16 CHIP) from the GCM board.
 ICM

The ICM replaces functions of GCM and CLKG boards.
 CLKD
The CLKD implements clock system extension when the subrack number (including
BUSN, BCTC and BPSN) is more than 15.
 BGCM
The BGCM provide clock and RS485 interface. In addition, it serves –48V power
supply for the GCM subrack.
4.6 Power Distribution Subsystem
4.6.1 Overview
Power Distribution Subsystem consists of two boards: Power Distributor (PWRD) and
Backplane of PWRD (PWRDB).
The functions of power distribution subsystem are:
 Distributes –48 V power to other shelves.
 Implements auto switching of two external power inputs for 1+1 power backup.
 Provides power indication, environment monitoring and fan shelf monitoring.
4.6.2 Power Distributor (PWRD)
POWER Distributor (PWRD) Module is the main monitoring module in power distribution
shelf.
PWRD board connects power supply, entrance control, smoke sensors, fan shelf and
temperature and humidity sensors via monitoring cables. PWRD detects over voltage or
under voltage, fan speed, environment temperature, environment humidity, smoke alarm,
infrared alarm, and cabinet and room entrance control. PWRD Provides two channels of
power voltage.

5 Technical Specifications
5.1 Running Environment Indices
5.1.1 Dimensions
The appearance of BSCB is shown in Figure 13.
Physical dimensions of a single rack are:
Type 1(Note that the side door is not detachable.): 2000 mm (78.74 inches) x 600 mm
(23.62 inches) x800 mm (31.50 inches) (HxWxD).
Type 2(Note that the side door is detachable.): 2000 mm (78.74 inches) x 640 mm
(25.20 inches) x 800 mm (31.50 inches) (HxWxD).
Figure 13 Color Picture of BSCB Rack
5.1.2 Gross Equipment Weight and Ground Bearing Capacity of the
Equipment Room
The maximal weight of a single rack fully configured is 310 kg (683.42 pounds) .
The equipment room floor is required to have the bearing capacity of 450kg/m
2
(92.16
pounds per square foot).
5.1.3 Working Voltage
A BSC adopts the -48 V DC power supply ranging from -18 V to -62 V.
5.1.4 Power Consumption
 Average power consumption of the Level-1 switching shelf (BPSN): < 880 W;

 Average power consumption of one control shelf (BCTC): < 600 W;
 Average power consumption of one resource shelf (BUSN): < 600 W;
 Average power consumption of one GCM shelf: < 60W.
5.1.5 Grounding Requirement
Joint grounding resistance:  1.
5.1.6 Temperature and Humidity
Table 1 Temperature and Humidity Requirements
Equipm
ent
Temperature Humidity
Working
Temperature
Working
Temperature
Recommended
Working
Humidity
Working
Humidity
Recommended
BSC
-5 °C (23 °F) ~
45 °C (113°F)
15 °C (59 °F) ~
35 °C (95 °F)
15%RH ~
93%RH
40%RH ~
60%RH
5.2 Performance Indices
5.2.1 Interface Indices
 The A1p/A2p interface supports the FE (10Mbps/100Mbps Ethernet electrical
interface) access.
 A1/A2/A5 interfaces support the connection of E1, T1 and STM-1;
 A3/A7 interfaces support the connection of E1, T1, FE, GE (1000Mbps Enternet
fibers interface) and STM-1;
 A10/A11 interfaces support the connection of FE and GE;
 Abis interfaces support the connection of E1, T1 ,FE, GE and STM-1;
 A12 interfaces support the connection of FE and GE;
 A13 interfaces support the connection of FE and GE;
 Number of FE at A1p interface: 2;
 Number of FE at A2p interface: 52;
 Number of E1/T1 at A interface: 2,400;
 Number of E1/T1 at Abis interface: 3,840.

 Number of E1/T1 at FE interface: 285.
5.2.2 Capacity Indices
 BHCA (Busy Hour Call Attempt): 4,700k;
 Voice traffic volume: 50,000Erl;
 Number of voice transcoders (BSCB of the A1/A2 interface) 50,400;
 Number of sector carriers supported: 15,360;
 Number of voice subscribers: 2,500k (0.02Erl/sub);
 Number of packet data service active PPP connections: 120,000;
 Total Throughput of packet data: 6Gbps;
 Number of PPP connection subscribers: 6 million;
 Number of the activated PPP subscribers: 120,000.
5.2.3 Clock Indices
 Features of the GPS clock (GCM):
 Clock reference source: 1PPS timing pulse signals output from the satellite
receiver;
 Working modes of the clock system: Fast capture, tracking, memory, free
oscillation
 The clock system provides the signal interface of the satellite receiver, and it
can be accessed to the satellite receiver directly, meeting the Level 2 clock
standard upon tracking GPS. The frequency accuracy of 10 MHz in the locked
GPS status is better than the precision of 10
-10
, and it is better than 10
-10
in the
maintained GPS module.
 Phase error: In the locked GPS status, the phase error is smaller than 3US; the
maintained GPS module status, the phase error within 72 hours is smaller than
10 us.
 Features of circuit clock (CLKG)
 Working modes of the clock system: Fast capture, tracking, memory, free
oscillation
 Circuit clock signal level: enhanced Level-3 clock.
 Accuracy of frequencies in the free run mode:  4.6x10
-6
(1 year);

 Holdover: Longer than  1x10
-9
Hz /day;
 Pull-in range:  4.6x10
-6
Hz .
5.2.4 Reliability Indices
 Mean Time Between Failures (MTBF) (hour): > 200,000 hours;
 Mean Time To Repair (MTTR) (in hour): 0.25 hours.
 Availibility: >99.9999%

6 Operation and Maintenance
6.1 Overview
The OMM (Operation Management Maintenance) system is to provide the maintenance
method with a means to ensure normal, highly efficient, reliable, economic and safe
operations of the CDMA BSS. With the support of the DBS (DataBase Subystem), it
conducts the central OAM and management of the CDMA BSSB, including the BSCB
and BTSB. In addition, it supports the local OMM of the BTSB.
Architecture of OMM is shown as the Figure 14.
Ethernet
SQL
Data
ClientServer
BSCB BTSB
BSCB BTSB
BTS Local OMM
PSTN
Server
Client Client
BTS Local OMM
Figure 14 Architecture of OMM
OMM subsystem includes Server, Client and local OMM of BTS.
6.2 Function Description of OMM
It has the following functions:
 Configuration management
It manages various configurations in the current BSS. Any change of the
network/system/unit configurations occurred due to all the causes takes into effect

unless it is implemented through configuration management. The configuration
management involves the physical resource, radio resource and SS7 configuration.
 Performance management
It starts the performance measurement function of the BSS, collects/processes
measured data, and implements necessary network management control activities
according to the measurement result to improve overall performance of networks. It
includes traffic and signaling performance measurement, service quality
measurement, availability measurement, throughput measurement and handoff
function measurement.
 Fault Management
It falls into two parts, alarm management and diagnosis test. The alarm
management function serves to receive the detailed alarm information sent from
network units in the form of fault reports, and monitor the network status, such as
the circuit group status, network node status, signaling system status and the MSC
area, registration area and cell status. If any network abnormality is found, it will
convert the information into audible, visual and screen display alarms to inform the
operators. When an alarm occurs or the system performance becomes weak, the
operator starts the corresponding test program to perform fault diagnosis and
locating test, as a result, he/she can take proper maintenance measures to
minimize the influence of the fault on the network operation. For on-site replaceable
component modules, the fault cannot be located on more than three modules in
terms of precision. The diagnosis test may be the board test and inter-module
communication link test.
 Security management
It prevents unauthorized persons from conducting deliberate or indeliberate
damages and modification via the background maintenance interface, and conducts
necessary restriction on the operation rights of the operator through different
operation levels. After the restriction operation, it integrates with the OS right
management, thus constructing the entire security system. It also contains the log
management module, for the afterwards analysis and location of the security
problems.
 System tools
It includes the dynamic data management, service observation, serve database
monitoring program, data backup recovery tools and report tools, which provide
substantial suggestions for system optimization, thus achieving a good maintenance
effect by obtaining twice the result with half the effort.
6.3 Remote OMM
OMM supports multiple remote OMM modes, including E1, DDN (Digital Data Network),
PSTN, and X.25.
It supports either a single networking via E1/DDN/PSTN/X.25 or hybrid networking.

E1/PSTN/DDN/X.25
OMM
Server
Client Client
LAN
Remote OMM
Figure 15 Networking Modes of remote OMM
6.4 Networking Modes of OMC
There are two networking modes for the OMC (Operation Maintenance Center)
according to the actual NE quantity: 3-layer and 2-layer network structures. Of them, the
3-layer structure is adopted upon requiring a great amount of NEs while 2-layer one
upon fewer NEs.
Figure 16 3-Layer Networking Structure of the OMC
The 3-layer networking architecture of the OMC is shown in Figure 15. The OMC is
composed of NE operation and maintenance (OMM), local-level OMC (LOMC), and

provincial level OMC (POMC).The LOMC and POMC can be the centralized NM points,
which is to say that the OMC_R (OMC for Radio side) and OMC_S (OMC for Switch side)
can be integrated or independently exist. The LOMC can manage about ten NEs (one
NE (Network Element) corresponds to an OMM) while the POMC about 40 NEs.
The 2-layer networking structure can be adopted when constructing a POMC with fewer
NEs. As shown in Figure 16, the LOMC is omitted and the POMC is constructed directly
from the OMM.
Figure 17 2-Layer Networking Structure of the OMC

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