Knowledge

Precautions for formal repair of optical cables

Feb 12, 2022

When officially repairing the optical cable line obstacles, it is necessary to maintain communication as much as possible, especially not to interrupt the communication of important circuits, and the construction quality must meet the requirements of the optical cable line construction quality standards and maintenance quality standards.

When officially repairing the total resistance of the optical cable line, the following issues should be paid attention to:

1. Obstacles near the splice box or the splice should be repaired by using the optical fiber reserved in the splice box or the optical cable reserved in the splice pit, without adding additional joints. When there is a reserved optical cable near the obstacle point, the reserved optical cable should be used for connection, and only one connector should be added.

2. When it is necessary to formally repair the optical cable obstacle by intervention or replacement of the optical cable, the optical cable of the same manufacturer and the same type should be used.

3. The length of intervening or replacing the optical cable can be considered by the following three factors:

(1) Considering that the OTDR must be used by the end station or the relay station to monitor the optical fiber when the optical cable is officially repaired, or it is convenient to distinguish the obstacles adjacent to the two connection points in the daily maintenance work; the minimum length of the intervention or replacement of the optical cable must meet the response of the OTDR instrument. Resolution (two-point resolution) requirements, generally should be greater than 100 meters.

(2) Considering that it will not affect the single-mode optical fiber to work under single-mode steady-state conditions to ensure the quality of communication, the minimum length of intervening or replacing the optical cable should be greater than 22 meters.

(3) To intervene or replace the length of the optical cable, you can refer to the principle requirements of (1) and (2), comprehensively consider the actual situation, and flexibly grasp. For example, if there is a connector near the intervention or replacement of the optical cable, the optical cable should be extended to the connector as far as possible, and only one connector should be added.


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