Emergency repair of trunk optical cables involves rapid fault detection, temporary restoration using emergency splice kits or backup fibers, and permanent repair to restore communication efficiently.

Fault Detection and Assessment

The first step in emergency repair is to locate the fault. Use an OTDR (Optical Time-Domain Reflectometer) from the nearest accessible fiber termination point to determine the distance to the break or high-loss event, which helps identify the exact fault location and affected circuits ( ). Notify the relevant maintenance unit and establish communication with the transmission room to coordinate the repair ( ).

Preparation for Emergency Repair

Once the fault is identified, the maintenance team should mobilize emergency repair tools and equipment, including emergency optical cables, splice closures, and testing instruments ( ). Pre-positioned materials and a documented emergency response plan significantly reduce downtime, especially for critical systems like SCADA or backbone communication networks ( ).

Temporary Restoration

If the trunk cable is completely broken, emergency optical cables or spare fiber cores can be used to quickly restore the main communication channel ( ). For partially interrupted fibers, techniques like open-sky "window connection" allow temporary repair without affecting other fibers in use ( ). Prioritize important circuits first, then secondary lines, to maintain essential services ( ).

Permanent Repair

After temporary restoration, the damaged section should be cut out and replaced with a new cable segment, using optical fiber splice closures to protect the new splice points ( ). Ensure that the replacement cable matches the design and fiber count of the existing network to maintain compatibility ( ).

Testing and Service Restoration

Once the repair is complete, notify the equipment room to test the restored fiber. Verify signal quality and ensure all affected services are operational before fully restoring communication ( ). Document the repair process, take photos, and update line information for future reference ( ).

Post-Repair Procedures

After completing the repair, inventory tools, organize test data, and secure the site. Leave personnel on-site if necessary to protect the repaired section. Summarize the emergency repair situation and report to the relevant supervisory department to improve future response efficiency ( ).

Best Practices

• Maintain backup fibers and emergency repair kits for rapid deployment ( ).
• Conduct regular testing and monitoring of trunk optical cables to detect potential faults early ( ).
• Establish a communication and command structure during repairs to coordinate personnel and logistics effectively ( ).
• Prioritize critical circuits to minimize service disruption during emergencies ( ). By following these steps, trunk optical cable faults can be addressed efficiently, minimizing downtime and ensuring the stability of communication networks.