When configuring the submarine cable detection system, you need to configure different boards as required. This topic describes the classification of boards and the methods of configuring board parameters.
Board Types
This topic describes board types by function.
Configuring the LMI
After creating the topology, you need to configure the parameters for the LMI according to the project requirements. The LMI detects the added or dropped wavelengths of signals, sends the detection signals into submarine cables for transmission, and splits backscatter optical signals from the detection signals in submarine cables. The backscatter optical signals are used for the detection and analysis of the receive end. It provides a function of near-end loopback, to locate faults between the landing station and the first RPT.
Configuring the LMU
After creating the topology, you need to configure the parameters for the LMU according to the project requirements. The LMU is used to monitor submarine equipment such as repeaters and submarine cables. It has a optical filter, and it can remove redundant ASE noise from receive side signal. Based on the optical time domain reflectometry (OTDR) technology, the LMU obtains the gain change information of the repeater, to locate fault points when the submarine cable is cut and test the working status of the line during the daily maintenance. The LMU provides the event analysis function for the OTDR curve reported by the line detection board, and also provides comparison and alarm reporting functions.
Configuring the LOA
After creating the topology, you need to configure the parameters for the LOA according to the project requirements. The LOA amplifies the monitoring pulse signals from the LMU board and also the Rayleigh backscatter signals from the main optical path.
Configuring the LSU
After creating the topology, you need to configure the parameters for the LSU according to the project requirements. By using the LSUs, the different submarine cable pairs can be monitored at different time.
Configuring the Board Threshold
In this user interface, you can set the alarm threshold for the board. When the actual value exceeds the preset threshold value, an alarm is generated.