Huawei Transponder board LSX Working Principle and Signal Flow Read

Huawei LSX board consists of the client-side optical module, WDM-side optical module, signal processing module, control and communication module, and power supply module.

Functional modules and signal flow of the LSX board



Only the TN12LSX/TN13LSX/TN14LSX board supports FC encapsulation and mapping module.

Signal Flow

In the signal flow of the LSX board, the transmit and the receive directions are defined. The transmit direction is defined as the direction from the client side of the LSX to the WDM side of the LSX, and the receive direction is defined as the reverse direction.

• Transmit direction
  The client-side optical module receives one channel of the optical signals from client equipment through the RX optical interface, and performs O/E conversion.
  After O/E conversion, the electrical signals are sent to the signal processing module. OTU2/OTU2e signals are sent to the client-side OTN processing module for performance monitoring. Other types of signals are sent to different encapsulation and mapping modules for encapsulation and mapping. In the end, operations such as the OTN framing and FEC encoding are performed. Then, the module outputs one channel of OTU2/OTU2e electrical signals.
  The OTU2/OTU2e signals are sent to the WDM-side optical module. After performing E/O conversion, the module sends out OTU2/OTU2e optical signals at DWDM wavelengths that comply with ITU-T G.694.1 through the OUT optical interface.
• Receive direction
  The WDM-side optical module receives one channel of OTU2/OTU2e optical signals at DWDM wavelengths that comply with ITU-T G.694.1 through the IN optical interface. Then, the module performs O/E conversion.
  After O/E conversion, the OTU2/OTU2e signals are sent to the signal processing module. The module performs operations such as OTU2/OTU2e framing, FEC decoding, demapping, and decapsulation processing. Then, the module outputs one channel of OC-192/STM-64/10GE LAN/10GE WAN/OTU2/OTU2e/FC1200 electrical signals.
  The client-side optical module performs E/O conversion of OC-192/STM-64/10GE LAN/10GE WAN/OTU2/OTU2e/FC1200 electrical signals, and then outputs client-side optical signals through the TX optical interface.

Module Function

• Client-side optical module
  The module consists of a client-side receiver and a client-side transmitter.
  • Client-side receiver: Performs O/E conversion of OC-192/STM-64/10GE LAN/10GE WAN/OTU2/OTU2e/FC1200 optical signals.
  • Client-side transmitter: Performs E/O conversion from the internal electrical signals to OC-192/STM-64/10GE LAN/10GE WAN/OTU2/OTU2e/FC1200 optical signals.
  • Reports the performance of the client-side optical interface.
  • Reports the working state of the client-side laser.
• WDM-side optical module
  The module consists of a WDM-side receiver and a WDM-side transmitter.
  • WDM-side receiver: Performs O/E conversion of OTU2/OTU2e optical signals.
  • WDM-side transmitter: Performs E/O conversion from the internal electrical signals to OTU2/OTU2e optical signals.
  • Reports the performance of the WDM-side optical interface.
  • Reports the working state of the WDM-side laser.
• Signal processing module
  The module consists of the SDH/SONET encapsulation and mapping module, 10GE LAN encapsulation and mapping module, client-side OTN processing module, FC encapsulation and mapping module, and OTN processing module.
  • SDH/SONET encapsulation and mapping module
    Encapsulates one channel of SDH/SONET signals and maps the signals into the OTU2/OTU2e payload area. The module also performs the reverse process and has the SDH/SONET performance monitoring function.
  • 10GE LAN encapsulation and mapping module
    Encapsulates one channel of 10GE LAN signals and maps the signals into the OTU2/OTU2e payload area. The module also performs the reverse process and has the 10GE LAN performance monitoring function.
  • FC encapsulation and mapping module
    Encapsulates one channel of FC signals and maps the signals into the OTU2/OTU2e payload area. The module also performs the reverse process and has the FC performance monitoring function.
  • Client-side OTN processing module
    Implements the OTN OSN6800 performance monitoring function.
  • OTN processing module
    Frames OTU2/OTU2e signals, processes overheads in OTU2/OTU2e signals, and performs the FEC encoding and decoding.
• Control and communication module
  • Controls operations on the board.
  • Controls operations on each module of the board according to CPU instructions.
  • Collects information about alarms, performance events, working states and voltage detection from each functional module on the board.
  • Communicates with the system control and communication board.
• Power supply module
  • Converts the DC power supplied by the backplane into the power required by each module on the board.