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In the iBSC system, the board refers to the integrated circuit board that can implement a specific function.

According to the hardware assembly relation, boards can be classified as front board and rear board.

The front board is inserted in the shelf slot, with a front panel. Indicators on the front panel indicate the board status. Rear board consists of the external interfaces and debugging interfaces. These interfaces are used to interconnect shelves of same cabinet or different cabinets. The rear board and the front board work together. For some active/standby front board, it is necessary to configure two kinds of rear boards.

Front board and rear board form a complete metal shield inside the shelf, reducing the external electromagnetic radiation of the system and enhancing the anti-interference capability.

The brief description of various boards is given below: 5.3.1 BSC IP Interface Board (BIPI/BIPI4)

BIPI/BIPI4 Functions

The IP interface between ZXG10 iBSC and BTS, SGSN, MSC/MGW is implemented by BSC IP interface board (BIPI/BIPI4). Each BIPI/BIPI4 provides four external interfaces.

According to functions, the BIPI/BIPI4 board is divided into the following three types of functional boards: Abis Interface IP Interface Board (IPBB), A-Interface IP Interface Board (IPAB), and Gb Interface IP Interface Board (IPGB).

5.3.2 Control Plane HUB (CHUB) CHUB Functions

CHUB and UIMC/UIMU/GUIM are used to exchange and converge the data flow at internal control plane.

5.3.3 Clock Generator Board CLKG (CLKG) CLKG (CLKG) Functions

For iBSC, there are three kinds of boards that can provide the clock for the system: CLKG (CLKG), CLKG (ICM), and ICM.

CLKG (CLKG) provides the following functions:

l Provides system clock and external synchronization. It extracts clock reference through A-interface and gives multiple timing reference signals to the interface units. l Supports background or manual selection of reference sources, including BITS,

network (8 kHz), GPS, and local (level 2 or level 3). Manual switchover can be screened by software.

l Uses loose-coupling phase-locked system, working in four modes: CATCH, TRACE,HOLD, and FREE. Outputs level-3 clock.

l Performs clock loss alarm and deterioration judgment for input reference supports active/standby switchover

5.3.4 Clock Generator Board CLKG (ICM) CLKG (ICM) Functions

For iBSC, there are three kinds of boards that can provide the clock for the system: CLKG (CLKG), CLKG (ICM), and ICM.

CLKG (ICM) provides the following functions:

l Provides system clock and external synchronization. It extracts clock reference through A-interface and gives multiple timing reference signals to the interface units. l Supports background or manual selection of reference sources, including BITS,

network (8 kHz), GPS, and local (level 2 or level 3). Manual switchover can be screened by software.

l Uses loose-coupling phase-locked system, working in four modes: CATCH, TRACE, HOLD, and FREE. Outputs level-3 clock. Performs clock loss alarm and deterioration judgment for input reference. Supports active/standby switchover.

5.3.5 Control Main Processing (CMP/CMP2) Board CMP/CMP2 Functions

CMP/CMP2 finishes the service and call management at PS/CS domain and the resource management ofBSSAP and BSSGP sub-layers and the system itself.

5.3.6 Digital Trunk Board (DTB) DTB Functions

Digital trunk board (DTB) provides the following functions: l Provides 32 E1/T1 physical interfaces.

l Extracts 8 kHz synchronization clock from a line and transfer it through a cable to CLKG/ICM as a reference clock.

l Supports 120/75 ohms resistance selection, and supports coaxial cable and twisted pair. (Supports 100 ohms twisted pair for T1).

5.3.7 E1 IP Interface Board (EIPI) EIPI Functions

EIPI provides the IP access based on E1/T1, under the assistance of DTB. EIPI board has no external interface and rear board. One EIPI board together with two DTB boards can support up to 64 E1/T1 interfaces.

5.3.8 GB Line Interface (GLI/GLI4) Board GLI/GLI4 Functions

GLI/GLI4 board implements functions such as physical layer adaptation, IP packet check, fragmentation, transfer management, and traffic management. The GLI/GLI4 board can handle the data with 2.5 Gbps and provide 4+4 GE interfaces to implement the interface among different resource shelves / GB resource shelves and the external interface function.

5.3.9 Gigabit Ethernet Network Interface (GIPI) Board GIPI Functions

The IP interface between ZXG10 iBSC, BTS, SGSN, and MSC/MGW is implemented by GIPI. Each GIPI provides a GE interface or four FE interfaces.

According to functions, the GIPI board is divided into the following four functional boards: Abis Interface Gigabit IP Interface Board (IPBB),

A-Interface Gigabit IP Interface Board(IPAB for signal),

A-Interface Gigabit IP Interface Board (IPI, for signal and service), and Gb Interface Gigabit IP Interface Board (IPGB).

5.3.10 Gigabit IP Interface 4 (GIPI4) GIPI4 Functions

GIPI4 provides the IP interface between ZXG10 iBSC and BTS. GIPI4 can be used to support the enhanced 1588V2 function or synchronous Ethernet function. Each GIPI4 provides two GE interfaces externally.

5.3.11 Gigabit Universal Interface Module (GUIM/GUIM2) GUIM/GUIM2 Functions

Gigabit Universal Interface Module (GUIM/GUIM2) implements Ethernet level-2 switching at control-plane/user-plane in the gigabit resource shelf, circuit-domain timeslot multiplexing switching, and gigabit resource shelf management, and provides external interface for the gigabit resource shelf.

GUIM/GUIM2 provides the clock-driven function in the gigabit resource shelf. Input PP2S, 8 kHz and 16 MHz signals, distribute the signals to various slots after phase lock and driving, and provide 16 MHz, 8 kHz and PP2S clocks to the boards in the gigabit resource shelf.

GUIM/GUIM2 provides the GB resource shelf management function and the RS-485 management interface. It also provides the function of board reset and in-position signal collection for the GB resource shelf.

5.3.12 GSM Universal Processing (GUP) Board GUP Functions

According to functions, the GUP board is divided into the following three types of functional boards: Ater Interface Processing Board (TIPB), Abis Interface Processing Board (BIPB), and Dual Rate Transcoder Board (DRTB).

The TIPB board realizes TDM/IP conversion at Ater interface. In other words, finding out 20 ms TRAU frames according to channel and making them into IP packet.

The CS service and PS service from BTS are switched to the BIPB board through the circuit switching network of the UIM board. The 20 ms TRU frames (or PCU frames) are found out according to channel on BIPB, then the TRU frames (or PCU frames) are made into IP packet and sent to TCU (or UPU) for processing.

The DRTB board realizes TRAU frame transcoding and rate adaptation and provides FR/EFR/HR/AMR/TFO functions.

5.3.13 GSM Universal Processing (GUP2) Board 2 GUP2 Functions

According to functions, the GUP2 board is divided into the following five kinds of functional boards: Ater Interface Processing Board (TIPB), Abis Interface Processing Board (BIPB), A- Interface Processing Board (AIPB), User Plane Processing Board (UPPB2), and Dual Rate Transcoder Board (DRTB).

The TIPB2 board realizes TDM/IP conversion at Ater interface. In other words, finding out 20 ms TRAU frames according to channel and making them into IP packet.

At STM-1 interface or E1 Abis interface, the CS and PS services from BTS are switched to the BIPB2 board through the circuit switching network of the UIM board or through the circuit switching network of the GUIM board. The 20 ms TRU frames (or PCU frames) are found out according to channel on BIPB2, and then the TRU frames (or PCU frames) are made into IP packet and sent to TCU (or UPU) for processing. At IP Abis interface, in addition to the above functions, the BIPB2 board is also used for RTP protocol processing.

The AIPB board is used for RTP protocol processing at A-interface and making data into IP packet.

The UPPB2 board is used for user plane protocol processing under A/Gb mode, including BSSGP, PDCP, and GTP_U protocol.

The DRTB board realizes TRAU frame transcoding and rate adaptation, and provides FR/EFR/HR/AMR/TFO functions.

5.3.14 Integrated Clock Module (ICM) ICM Functions

For iBSC, there are three kinds of boards that can provide the clock for the system: CLKG (CLKG), CLKG (ICM), and ICM. Functions of ICM are as follows:

l Provides system clock and external synchronization. It extracts clock reference through A-interface and gives multiple timing reference signals to the interface units.

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Receives GPS satellite system signals, extracts and generates 1PPS signal and corresponding navigation message (TOD message), and generates PP2S, 19.6608MHz, and system 8K clock reference required by the system.

l Supports BITS, one line (8 K), and two GPS8K (from the local board and external GPS) as the reference for local clock.

l Supports background or manual selection of reference sources, including BITS, network (8 kHz), GPS, and local (level 2 or level 3). Manual switchover can be screened by software.

l Uses loose-coupling phase-locked system, working in four modes: CATCH, TRACE, HOLD, and FREE. # Outputs level-3 clock. # performs clock loss alarm and deterioration judgment for input reference. # Supports active/standby switchover. In comparison with ICM and CLKG (ICM), add GPS function, which can provide GPS satellite information for the system and be available for system positioning function, and also add a source for referential clock.

5.3.15 Operation and Maintenance Processing (OMP/OMP2) Board

OMP/OMP2 Functions

OMP/OMP2 provides the following functions:

l Implements all the operation and maintenance processes and related controls, and provides a FE interface to connect OMM through 100 Mbps Ethernet.

l As the processing core of ZXG10 iBSC operation & maintenance, it can directly or indirectly monitor and manage all boards in the system. It provides two links (Ethernet and RS485) for configuration management of system boards.

5.3.16 Packet Switching Network (PSN) Board PSN Functions

Packet Switching Network (PSN) provides the following functions:

 Supports bi-directional user data switching at the rate of 40 Gbps in each direction.

 Implements 1+1 load sharing.

5.3.17 Power Distribution (PWRD) Board PWRD Functions

PWRD provides the following functions:

l Provides -48 V power to shelves and fans inside the cabinet. Detects rack power and the environment, and generates alarms accordingly.

l PWRD is monitored and managed by OMP through RS485 interface. It reports the detected information to OMP and indicates through indicators on the power distribution plug-in box panel.

5.3.18 Server Board (SBCX/SBCX2)

SBCX/SBCX2 Functions

SBCX/SBCX2 provides the following functions.

l Provides interfaces for keyboard, mouse, and VGA. CPU is dual-channel dual-core processor, with a main frequency of 2 GHz. supports multiple operating systems, including Windows XP/2000/2003/Linux and Solaris operating system. Provides 4 FE interfaces and 2 GE interfaces.

l Provides 4 USB interfaces.

5.3.19 SONET Digital Trunk Board (SDTB) SDTB Functions

SDTB is used as digital relay interface board, providing one 155 Mbps STM-1 interface. SDTB provides the following functions.

l Provides the APS function. Supports Channel Associated Signal (CAS) and Common Channel Signaling (CCS). Outputs two differential 8 K synchronous clock signals for reference of the clock board.

5.3.20 SONET Digital Trunk Board2 (SDTB2) SDTB2 Functions

SDTB2 is used as digital relay interface board, providing two 155 Mbps STM-1 interfaces. SDTB2 provides the following functions.

l Provides 2 155M STM-1 standard interfaces. (Provides the APS function).

l Supports Channel Associated Signal (CAS) and Common Channel Signaling (CCS), provides an access processing capability of 126 E1s or 168 T1s.

l Outputs two differential 8 K synchronous clock signals for reference of the clock board

5.3.21 Signaling Processing Board (SPB)

SPB Functions

According to functions realized, SPB can be used as LAPD processing board (LAPD), signaling processing board (SPB), and Gb interface processing board (GIPB).

LAPD mainly handles the LAPD signal. The LAPD signal from BTS is accessed by DTB/SPB board, and switched to LAPD board through the circuit switching network on UIMU/UIMC board in the resource shelf.

The LAPD board implements the LAPD processing.

SPB mainly handles the MTP2 and X.25 protocols. Extracts 8 kHz synchronization clock from a line and transfer it through a cable to clock generation board as a reference clock.

GIPB handles GPRS FR and NS, and some BSSGPs, and some Gb interface functions. SPB supports the following cables:

Supports 120/75 Ω resistance selection, and supports coaxial cable and twisted pair. (Supports 100 Ω twisted pair for T1).

5.3.22 Signaling Processing Board 2 (SPB2) SPB2 Functions

According to functions, SPB2 can be used as signaling processing board (SPB2) and Gb interface processing board (GIPB2).

SPB2 mainly handles the MTP2 and X.25 protocols, extracts 8 kHz synchronization clock from line, and transfers it through a cable to clock generation board as a reference clock.

GIPB2 processes GPRS FR, NS, and some BSSGP, and performs the Gb interface functions. SPB2 provides 16 E1/T1 links and supports the following cables:

(Supports 120/75 Ω impedance selection for E1, and supports coaxial cable and twisted pair. Supports 100 Ω impedance twisted-pair for T1).

5.3.23 Universal Interface Module for Control Plane (UIMC) UIMC Functions

UIMC mainly implements Ethernet level-2 switching in control shelf and manages the control shelf. Provides an internal user plane GE interface to cascade UIMC with CHUB in the control shelf.

UIMC provides the clock-driven function inside the control shelf. Input PP2S, 8 kHz and

16 MHz signals are distributed to various slots after phase lock and drive, to provide 16 MHz and 8 kHz clocks to the boards.

UIMC provides the management interfaces for control shelf and switching shelf; also provides the signal collection functions of resetting the control shelf and switching shelf.

5.3.24 Universal Interface Module for User Plane (UIMU) UIMU Functions

UIMU implements Ethernet level-2 switching in the resource shelf, CS domain timeslot multiplexing switching, and resource shelf management, and provides external interface for the resource shelf.

UIMU provides the clock-driven function in the gigabit resource shelf. The input 8 kHz and

16 MHz signals are distributed to various slots after phase lock and driving, to provide 16 MHz and 8 kHz clocks to boards in the gigabit resource shelf.

UIMU provides the resource shelf management function, RS-485 management interface in the resource shelf, and the signal collection function to reset boards of the resource shelf.

5.3.25 User Plane Processing Board (UPPB) UPPB Functions

UPPB handles the BSSGP, PDCP, GTP_U, and Iu_UP protocols in A/Gb and Iu modes.

1. The UPPB board consists of the following five units: