Submarine Cable Line Test Modes

The submarine cable line monitoring function is used to monitor status and locate faults of the submarine equipment. The SLM 1630 provides two test modes for submarine cable lines. The modes include in-service mode and out-of-service mode.

According to the line status and actual requirements, you can test a submarine cable line in in-service mode or out-of-service mode.

In-Service Mode

By using the in-service test mode of the SLM 1630, you can test submarine cables and repeaters without damaging the existing services of the submarine system. You can also compare the history data and analyze the test data of the submarine system. The test in in-service mode is classified into four types as follows:

Manual test: You need to set test parameters manually, start the test, and save the test result as the baseline in need of the in-service mode.
Baseline collection test: In the case of deployment or fault restoration, or when updating the baseline is required, you need to collect the baseline, to provide reference for comparison tests, and alerts or alarms.
Comparison test in single-test mode: Test a line by using test parameters of the baseline collection test in in-service mode, compare the test result with the baseline data, and provide alerts or alarms for the line.
Comparison test in periodic mode: Carry out polling tests for multiple lines on the same LMU board periodically, compare the test result with the baseline data in in-service mode, and provide alerts or alarms for the line.

Out-of-Service Mode

By transmitting detection light with high power, the out-of-service test of the SLM 1630 can detect the fiber status and repeater status, to realize the status detection and fault point location after fiber cut. In general, in the case of deployment, you can carry out a test in out-of-service mode to locate the fault. The test in out-of-service mode is classified into four types as follows:

Manual test: You need to set test parameters manually, start the test, and save the test result as the baseline in need of the out-of-service mode.
Baseline collection test: In the case of deployment or fault restoration, or when the baseline updating is required, you need to collect the baseline, to provide reference for comparison tests, and alerts or alarms.
Comparison test in single-test mode: Test a line by using test parameters of the baseline collection test in out-of-service mode, compare the test result with the baseline data, and provide alerts or alarms for the line.
Fast fault location test: When a line is faulty, you can fast locate the fault point by using this function. Within 15 minutes, the test is finished and the data related to the fault point is expressed in a diagram.