BSC6900 Introduction The BSC6900 is developed using a new hardware platform and is characterized by

high performance and modular structure. This meets the networking requirements

under different conditions and provides operators with a network of low cost, high

quality, and easy maintenance and expansion. Figure 2-2 and Figure 2-3 show the

dimensioning and inner configurations of a single BSC6900 cabinet.

Figure 1-1 BSC6900 N68E-22 cabinet (single cabinet)

Figure 1-2 Configurations of the BSC6900 cabinet (front and rear)

Table 1-1 Specifications of the BSC6900 using HW69 R11 boards

Performance specifications

BSC specification

Maximum number of TRXs: 4,096 Maximum traffic volume: 24,000 Erlang Maximum number of BHCAs: 5,900K Maximum number of activated PDCHs: 16,384 An RNC supports a maximum of 1,440 NodeBs, 2,400 cells, 4 Gbit/s or 26,800 Erlang, or 1,120K BHCAs. The previous specification corresponds to the configuration with four fully-configured BSC subracks and two fully-configured RNC subracks.

RNC specification

Supports a maximum of 2520 NodeBs and 5100 cells, and 6.7 Gbit/s traffic throughput/67000 Erlang, 2660k BHCAs (based on Huawei traffic model). A BSC supports a maximum of 1024 TRXs, 6500 Erlang, or 1750k BHCAs. The previous specification corresponds to the configuration with five fully-configured RNC subracks and one fully-configured BSC subrack.

Structural specifications

Dimensioning of the BSC6810 N68E-22 cabinet: 2,200 mm (height) x 600 mm (width) x 800 mm (depth) Single cabinet weight 350 kg, load-bearing capacity of the floor 450 kg/m2.

Power supply specifications

48 V DC, input voltage range: 40 V to 57 V

1.1.1.2 BSC6900 Cabinet In terms of the subrack configuration, the BSC6900 cabinet is classified into the

Main Processing Rack (MPR), Extended Processing Rack (EPR), and TransCoder

Rack (TCR), as described in Table 2-22. If the number of subracks configured in

the cabinet is less than three, the subracks should be configured from the bottom

up.

Figure 1-3 BSC6900 cabinet

Table 1-2 Classification of BSC6900 cabinets

Cabinet Contained Subrack Configuration Principle

MPR 1 MPS, 02 EPSs Only one MPR is configured.

EPR 13 EPSs As required by the actual service capacity, 01 EPR is configured.

TCR 13 TCSs In BM/TC separated mode, 02 TCRs are configured.

1.1.1.3 BSC6900 Subracks In compliance with the IEC60297 standard, the BSC6900 subrack has a standard width of 19 inches. The height of each subrack is 12 U. The boards are installed on the front and rear sides of the backplane, which is positioned in the center of the subrack.

One subrack provides 28 slots. The slots on the front of the subrack are numbered from 0 to 13, and those on the rear are numbered from 14 to 27.

Figure 2-5 shows the front view and rear view of the subrack.

Figure 1-4 Front view (left) and rear view (right) of the subrack

The BSC6900 subracks are classified into main processing subrack (MPS), extended processing subrack (EPS), and transcoder subrack (TCS), as described in Table 2-3.

Table 1-3 Classification of BSC6900 subracks

Subrack Quantity Function

MPS 1 The MPS performs centralized switching and provides service paths for other subracks. It also provides the service processing interface, OM interface, and system clock interface.

EPS 0-5 The EPS performs the functions of user plane processing and signaling control.

TCS 0-4 The TCS is configured only in BM/TC separated mode.

The TCS processes CS services and performs the functions of voice adaptation and code conversion.

1.1.1.4 BSC6900 Boards

Table 1-4 Classification of BSC6900 boards

Board Type

Board Name

Function Application Variant

OM board OMUa Performs configuration management, performance management, fault management, security management, and loading management for the BSC6900.

Works as the OM bridge of the LMT/M2000 to provide the BSC6900 OM interface for the LMT/M2000 and to enable the communication between the BSC6900 and the LMT/M2000.

Works as the interface to provide the web-based online help.

The OMUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

Switching processing board

SCUa Provides MAC/GE switching and enables the convergence of ATM and IP networks.

Provides data switching channels. Provides system-level or subrack-level

configuration and maintenance. Distributes clock signals for the BSC6900.

The SCUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

TNUa Provides the TDM switching and serves as the center of the circuit switched domain. Assigns the resources of the TDM network and

establishes the network connection. Provides the communication processing on the GE

port.

The TNUa board is applicable to the BSC6900 GSM and the BSC6900 GU.

Clock processing board

GCUa Obtains the system clock source, performs the functions of phase-lock and holdover, and provides clock signals.

The GCUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS. The GCGa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GCGa Obtains the system clock source, performs the functions of phase-lock and holdover, and provides clock signals.

Receives and processes the GPS signals.

Board Type

Board Name

Function Application Variant

Signaling processing board

SPUa Manages user plane and signaling plane resources in the subrack and processes signaling. Differences: The SPUa board processes the signaling on the GSM/UMTS signaling plane. The XPUa board processes the signaling on the GSM signaling plane.

The SPUa board is applicable to the BSC6900 GSM, BSC6900 UMTS and BSC6900 GU. The XPUa board is applicable to the BSC6900 GSM and BSC6900 GU.

XPUa

SPUb Manages user plane and signaling plane resources in the subrack and processes signaling. Differences: The SPUb board processes the signaling on the GSM/UMTS signaling plane. The processing capability of the SPUb board is 75% to 100% higher than that of the SPUa board. The XPUb board processes the signaling on the GSM signaling plane. The processing capability of the XPUb board is 75% to 100% higher than that of the XPUa board.

The SPUb board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS. The XPUb board is applicable to the BSC6900 GSM and BSC6900 GU.

XPUb

Service processing board

DPUb Processes CS services and PS services within the system. Differences: The DPUb board processes the services on the UMTS user plane, encodes and decodes the GSM speech services and data services, and converts the speech frame format over the IP speech channel and the speech channel in HDLC transmission optimization. The DPUc board encodes and decodes the GSM speech services and converts the speech frame format over the IP speech channel and the speech channel in HDLC transmission optimization. The DPUd board processes the GSM data services.

The DPUb board is applicable to the BSC6900 GU, and BSC6900 UMTS. The DPUc board is applicable to the BSC6900 GSM and BSC6900 GU. The DPUd board is applicable to the BSC6900 GSM and BSC6900 GU.

DPUc

DPUd

DPUe Processes CS services and PS services within the system. The DPUe board processes the services on the UMTS user plane.

The DPUe board is applicable to the BSC6900 UMTS and BSC6900 GU.

Interface processing board

AEUa Provides 32 channels of ATM over E1s/T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The AEUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

Board Type

Board Name

Function Application Variant

AOUa Provides two channels of ATM over channelized optical STM-1/OC-3

Supports ATM over E1/T1 over SDH or SONET. Provides 126 E1s or 168 T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The AOUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

EIUa Provides 32 E1s/T1s. Transmits, receives, encodes, and decodes the 32

E1s/T1s. The E1 transmission rate is 2.048 Mbit/s; the T1 transmission rate is 1.544 Mbit/s.

The EIUa board is applicable to the BSC6900 GSM and BSC6900 GU.

FG2a Provides eight channels over FE electrical ports or two channels over GE.

Supports IP over FE/GE.

The FG2a board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GOUa Provides two channels over GE. Supports IP over GE.

The GOUa board is applicable to the BSC6900 GSM, BSC6900 GU and BSC6900 UMTS.

OIUa Provides one channel over STM-1. Provides one channelized STM-1 with the rate of

155.52 Mbit/s.

The OIUa board is applicable to the BSC6900 GSM and BSC6900 GU.

PEUa Provides 32 channels of IP over E1s/T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The PEUa board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

POUa Provides two channels of IP over channelized optical STM-1/OC-3.

Supports IP over E1/T1 over SDH/SONET. Provides the load bearer capability of 126 E1s or

168 T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The POUa board is applicable to the BSC6900 UMTS and BSC6900 GU.

UOIa Provides four channels over the unchannelized STM-1/OC-3c.

Supports ATM/IP over SDH/SONET. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The UOIa board is applicable to the BSC6900 UMTS and BSC6900 GU.

Board Type

Board Name

Function Application Variant

AOUc Provides four channels of ATM over channelized optical STM-1/OC-3.

Supports ATM over E1/T1 over SDH or SONET. Provides 252 E1s or 336 T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The AOUc board is applicable to the BSC6900 UMTS and BSC6900 GU.

FG2c Provides 12 channels over FE or 4 channels over GE.

Supports IP over FE/GE.

The FG2ac board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

GOUc Provides four channels over GE. Supports IP over GE.

The GOUc board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

POUc Provides four channels of TDM/IP over channelized optical STM-1/OC-3.

Supports IP over E1/T1 over SDH/SONET. Provides the load bearer capability of 252 E1s or

336 T1s. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The POUc board is applicable to the BSC6900 GSM, BSC6900 GU, and BSC6900 UMTS.

UOIc Provides eight channels over unchannelized STM-1/OC-3c.

Supports IP over SONET. Extracts the clock signals and sends the signals to

the GCUa or GCGa board.

The UOIc board is applicable to the BSC6900 GU and BSC6900 UMTS.

1.1.1.2 BSC6900 Cabinet1.1.1.3 BSC6900 Subracks1.1.1.4 BSC6900 Boards