1. Handling after a fault occurs. Different types of line faults have different processing priorities.

(1) There is a backup routing optical cable that can pass through all-blocking faults

The personnel on duty in the computer room should jump-connect the business as soon as possible according to the emergency plan, use other good fiber cores to block the business on the optical fiber, and then repair the faulty optical fiber as soon as possible.

(2) Total resistance failure with no optical fiber to pass through

According to the emergency plan, rush-to-pass or direct repair of obstacle points should be carried out. When rushing to pass or repairing, the principle of "important lines first, then secondary lines" should be followed.

(3) The optical cable is not completely blocked and there are remaining optical fibers available.

Use the spare fiber core or other optical cables on the same route to pass the services on the faulty fiber core. If there are many faulty fiber cores, not enough spare fiber cores, and there are no other backup routing optical cables, secondary lines can be sacrificed to pass through important lines, and then the faulty fiber cores can be repaired without interrupting the line.

(4) The optical cable is not completely blocked, there is no remaining optical fiber or the same route optical cable

If the blocked optical fiber is an important line, other non-important line optical fibers should be used to pass the blocked optical fiber, and the faulty fiber core should be repaired urgently by non-interruptive cutover method.

(5) The transmission quality is unstable and the system is good and bad sometimes.

If there are spare cores or other routed optical cables that can be passed through, the services on this optical fiber can be transferred to other optical fibers. Find out the reasons for the degradation of transmission quality and deal with them in a targeted manner.

2. Fault location

If it is determined that the fault is an optical cable line, the computer room should quickly use an OTDR (optical time domain reflectometer) to determine the outgoing distance of the fault and the specific circumstances of the fiber fault. Based on the judgment results, the relevant line maintenance unit will be notified immediately to determine the fault point.

3. Emergency repair preparations

After receiving the fault notification, the line maintenance unit should quickly load the repair tools, instruments and equipment into the vehicle and set off, and at the same time notify the relevant maintenance line operators to go to nearby areas to find the cause and fault point.

4. Establish a communication system

After emergency repair personnel arrive at the fault point, they should immediately establish a communication system with the transmission equipment room.

5. Organization and command of emergency repairs

The emergency repair of optical cable line faults is led by the department, which pays close attention to the emergency repair situation on site during the emergency repair period and coordinates the work. The leader of the optical cable line maintenance department is responsible for directing the emergency repair site. While testing the fault point, a designated person (usually an optical cable maintainer) should be designated at the repair site to organize the excavation personnel on standby and arrange logistical services.

6. Emergency repair of optical cable lines

When the fault point is found, emergency optical cables or other emergency measures should generally be used to first clear the main optical fiber channel and quickly restore communications. Main solutions:

(1) The optical cable is completely broken

If there are reservations on both sides of the site, use centralized reservation and add a joint. If there are joints near the fault point and there is sufficient reservation on site, pull the reservation and use the original joint. There is no reservation near the fault point. If there is no connector left, it should be solved by extending the cable.

(2) Some bundle tubes in the optical cable are interrupted or some optical fibers in a single bundle tube are interrupted

Under specific conditions and on the premise that the repair will not affect other optical fibers in use, it is recommended to use the open-sky "window connection" method to repair the faulty optical fiber.

7. Business recovery.

During the on-site optical cable repair process, after the optical fiber is connected, the computer room should be notified in time for testing and maintenance personnel should be arranged to conduct on-site business confirmation until the business is fully restored.

8. On-site treatment after emergency repair.

After the emergency repair work is completed, inventory tools and equipment, organize test data, fill in relevant registrations, process the site, and leave a certain number of personnel behind to protect the emergency site.

9. Line information updated.

After the repair work is completed, organize the test data, fill in the relevant forms, update the line information in a timely manner, summarize the emergency repair situation, and report to the superior authority.

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