​Placing emergency cables

Update:25 Jun 2018
Summary:

1) Conditions for deploying emergency cable When the op […]

1) Conditions for deploying emergency cable

When the optical cable line in one direction is completely blocked, after all the circuits or the main cable is turned on, it is considered to repair the optical cable at once, and it is not necessary to adopt an emergency circuit breaker. In the absence of conditions for temporary commissioning of the circuit, or temporary adjustment of part of the circuit can not meet the needs of large-capacity communications, should be deployed emergency cable, in accordance with the "circuit scheduling system" provisions of the scheduling principles and scheduling order to rush through the circuit, temporary Resume the communication, and then re-select the route to place the new optical cable for a formal repair.

2) Determination of the scope of emergency optical cable deployment

The optical cable suffers from obstacles caused by natural disasters or external forces. Generally, after determining the approximate location of the obstacle, it is relatively easy to find the obstacle according to the road surface abnormality, and the deployment range of the emergency optical cable can be determined. However, when using an OTDR to measure only the obstacle point at an end station or a relay station, it is difficult to determine the deployment range of the emergency optical cable when it is between two joints and the specific location of the obstacle cannot be determined. At this time, if there are conditions, you can use the OTDR to test at the opposite relay station, comprehensively analyze the test results on both sides, generally can accurately determine the cable breakpoints, if there is no condition to use OTDR test from two directions, you can send two The situation is dealt with:

a) The obstacle point is closer to a certain joint. The emergency optical cable is intended to be deployed by this joint. Open this joint and use the OTDR to test the joint at the joint direction. The distance is short and the obstacle can be measured more accurately. The specific location will determine where the emergency cable will be deployed.

b) The obstacle point is located at the middle of the two joints. It is not appropriate to place the emergency cable from a joint. It is necessary to further determine the location of the obstacle and place an emergency cable on both sides of the obstacle. In this case, a gradually extending heuristic can be used to find the specific location of the obstacle, that is, to use an OTDR to initially measure the obstacle point at the end station or relay station, dig out the optical cable in front of the obstacle point, and cut off an optical fiber for retesting. If it is found that the obstacle point is not in the cut-off range, you should judge how far it should be, and then dig out the optical cable to the front, cut off another fiber, and measure it again until the obstacle point is included in the cut-off point. Optical cable deployment range. The general retest can be used to determine the specific location of the obstacle.

c) Emergency repair of the same type of cable acceleration connector

Another emergency repair method for optical cables is to use optical cables of the same type as the barrier optical cables as emergency repair optical cables, and use connectors (junction joints) to add matching liquids for temporary connection and to break through the circuit.

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