The LSXR board consists of the optical receiving module, optical transmitting module, signal processing module, control and communication module, and power supply module.
Figure 1. Functional modules and signal flow of the LSXR board
The LSXR board implements the regeneration of one channel of unidirectional optical signals. The signals at the receive and transmit ends of the board are OTU2/OTU2e optical signals at DWDM wavelengths that comply with ITU-T G.694.1.
The optical receiving module receives the optical signals to be regenerated through the IN interface, and performs O/E conversion.
The signal processing module performs decoding, overhead processing and encoding of signals. During the process, the reshaping, regenerating and retiming based on electrical signals are performed, and the signals are encapsulated into OTN frames.
After being encoded, the signals are sent to the optical transmitting module. After performing E/O conversion, the module sends out OTU2/OTU2e signals at DWDM wavelengths that comply with ITU-T G.694.1.
The optical signals are output through the OUT interface.
Module Function
• Optical receiving module
* Reports the performance of the WDM-side optical interface.
* Reports the working state of the WDM-side laser.
* Performs O/E conversion of OTU2/OTU2e optical signals at DWDM wavelengths that comply with ITU-T G.694.1.
• Optical transmitting module
* Reports the performance of the WDM-side optical interface.
* Reports the working state of the WDM-side laser.
* Performs E/O conversion from the internal electrical signals to OTU2/OTU2e optical signals at DWDM wavelengths that comply with ITU-T G.694.1.
• The signal processing module
The module consists of the decoding module, overhead module, and encoding module.
* Decoding module
Performs the FEC decoding of OTU2/OTU2e signals, and monitors the performance of WDM-side services.
* Encoding module
Performs the FEC encoding of OTU2/OTU2e signals.
* Overhead module
Performs overhead processing of OTU2/OTU2e signals, and monitors the performance of WDM-side services.
• 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.
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