The ZXSDR B8200 is a baseband unit. It can be integrated into the cabinet of a macro base station. It is connected to the RF System Unit (RSU) inside the cabinet or connected to a Remote Radio Unit (RRU) of a distributed base station.Figure shows the external view of the ZXSDR B8200.
Chassis

Boards of the ZXSDR B8200

Boards and Modules

Power Module (PM)

Function

The PM module is a -48 V power module. It provides power supply for all boards. Two PMs can operate in active and standby mode or load sharing mode. The PM has the following features:

  •  +12 V DC load power supply. 
  •  +3.3 V DC management power supply. 
  •  EMMC management. 
  •  Over/under-voltage measurement and protection for the input power supply. 
  •  Over-current protection for the output power supply and load power supply management. 

 The PM module has three types of boards. For detailed information

Panel

Control and Clock (CC) Module

 Function

The CC module performs baseband unit control management and Ethernet switching, and provides the system clock. It provides the following functions:

  • Implements the Ethernet switching function, switching service data flow and control data flow within the system.
  • Implements Abis/Iub/S1/X2 interface protocol processing.
  • Monitors the control and maintenance of the base station system, and provides the LMT interface.
  • Performs software version management and programmable device management, and supports local and remote software upgrade.
  • Monitors the operating status of each board in the system.
  • Synchronizes with external reference clocks, including the IEEE1588 clock, GPS clock, and the clocks (2 Mbits and 2 MHz) provided by the BITS. The CC board can be configured as needed.
  • Generates and transmits clock information as needed.
  • Provides GPS signal interfaces and manages GPS receivers.
  • Provides the unified reference clock for system operation and maintenance. The real-time clock can be calibrated.
  • Reads hardware management information, including rack number, back-end type, slot number, board type, board version, and board function configuration information.
  • Supports active/standby switchover.
  • Provides maintenance functions for the MicroTCA module. The CC16B/CC17B/CCE1 provides the following functions:
  • Supports Ethernet clock synchronization.
  • Provides USB interfaces for software upgrade. There are four types of CC boards. For the performance specifications
Panel

Universal Clock Interface (UCI) Board

Functions

The UCI board is an RGPS interface board. It performs functions including BBU clock receiving, conversion, and forwarding. It has the following features:
  • Supports the GLONASS/GPS dual-mode receiver. 
  • Supports 1PPS+TOD outputs from the front panel and backplane for the CC board in the shelf and cascaded boards.

Panel



Universal Baseband Processing Board for GSM (UBPG/UBPG3)

Functions

The UBPG and UBPG3 boards are GSM baseband processing boards, processing physical layer protocols and frame protocols defined by 3GPP. The UBPG supports 12 TRXs while the UBPG3 supports 24 TRXs. They provide the following functions:

  • Implement rate adaptation, channel coding, interleaving, and encryption, generates TDMA burst pulses, performs GMSK/8PSK modulation, and outputs IQ baseband digital signals. 
  • Receive IQ data on uplink, combines receiver diversities, performs digital demodulation (GMSK and 8PSK demodulation, and balancing), decryption, de-interleaving, channel decoding, and rate adaptation, and sends the signals to the CC board through the GE Ethernet interface. 
  • Perform radio channel synchronization, and processes transmission frames. 
  • Measure the parameters of power control and handover. 
  • Communicate with the CC board through the Ethernet interface. 
  • Read various hardware management identifications, including back-end type, slot number, board function type, board version, board function configuration ID, and CPU serial number.
Panel

UMTS Baseband Processing Board (BPK_e1/BPK_e/BPK_d)

Function

The BPK_e1, BPK_e, and BPK_d boards are UMTS baseband processing boards, processing physical layer protocols and frame protocols defined by 3GPP. There is no interface on the BPK_e1, BPK_e, and BPK_d boards. These boards provide the following functions:

  • Implement downlink baseband signal processing, including downlink data coding, multiplexing, bit rate matching, channel mapping, spectrum spreading and scrambling, power adjustment, and channel combination. 
  • Implement uplink baseband signal processing, including RAKE signaling receiving and channel decoding, and sends the data to the Iub interface for processing. 
  • Support A-RAKE receiving and uplink interference elimination. 
  • Perform radio channel synchronization, and processes transmission frames. 
  • Measure the parameters of power control and handover. 
  • Perform soft handover and carrier diversity. 
  • Communicate with the CC board through the Ethernet interface. 

The BPK_e1, BPK_e, and BPK_d boards provides the same functions, but they differ in the number of CEs supported, the number of cells supported, and data throughput. For the performance specifications

LTE Baseband Processing Board (BPL1A/BPL1/BPN0A/BPN0)

Function


 Baseband Processing Board Type N2 (BPN2)

Function

The BPN2 is a GSM/UMTS/LTE multi-mode baseband processing board. It integrates the functions of the GSM single-mode baseband board, UMTS single-mode baseband, and LTE single-mode baseband. It can operates in single-mode or multi-mode.

Universal Ethernet Switch Board (UES)

Function

The UES board performs Ethernet synchronization, and can operate as a layer-2 switch. When it operates as an Ethernet switch, it is used for converging the data of other BBUs of the physical site (one physical site can have multiple BBUs). It has the following features:
  • Provides six Ethernet interfaces, including four electrical interfaces and two optical interfaces. 
  • Supports L2 Ethernet switching, 802.1q VLAN, and interface flow control. 
  • Supports the SyncE clock function.

Fabric Switch Module (FS)