1. Common obstacles and causes of optical cable lines

(1) All lines are interrupted: the r-los alarm occurs on the optical panel, the possible reason is that the optical cable is cut, blown or pulled due to external force;

(2) The communication quality of individual systems is degraded: a bit error alarm occurs, and the possible cause of the line is that the optical fiber is damaged during the laying and connection process of the optical cable, which causes the line loss to be small.

2. After determining the line obstacle, use otdr to test the line to determine the nature and location of the obstacle.

When the optical cable line is blocked due to external forces such as natural disasters or external construction, it is generally easier for the repair personnel to find the location based on the location provided by the tester. Place.

At this time, the distance from the obstacle point to the test point measured by otdr must be checked with the original test data to find out which section the obstacle point is in. After necessary conversion, the ground distance between them must be accurately measured until Find the exact location of the obstacle point. However, things are often unsatisfactory, and the obstacle point is very different from the position of the measurement and calculation, which is a waste of manpower and material resources, and the impact or loss caused by the obstruction of the optical cable line will be greater.