8 reasons for cable blocking


1. Construction excavation

Excavation of the construction site, digging of drainage ditches after rain, municipal greening, and excavation of heating and natural gas pipelines are the main reasons for the cut. Within 1 km of the end, the lead-up point, the pole-passing point, the inside of the pipeline, and the inflection point should be checked to prevent other breakpoints and stretch points.


The ability to arrive at the fault site as soon as possible is an important factor in ensuring the duration of fault repair. Once the optical cable is cut and backfilled by the construction party, it will cause great difficulty in repairing the fault.


If the surrounding pipe wells are buried or the pipes are damaged, the temporary route is determined on the spot and the optical cable is repaired immediately. The on-site situation is complex. If it is impossible to determine which plan is fast and effective, multiple plans will be implemented simultaneously with sufficient personnel on site. Whether the excavation tools such as shovels and foreign picks are fully prepared is also one of the key factors restricting the repair time. To avoid creating new points of failure, mechanical excavation should not be used on site as much as possible.


After the troubleshooting is completed, a marking stone should be set up at the cut to protect the optical cable splice box. There is no temporary safe route relocation, and personnel need to be assigned on-site marking.

fiber optic cable

2. The vehicle hangs up

If the fault point is across the road, the emergency repair personnel should set up a warning sign after arriving at the scene, designate a special person to direct the traffic, protect the personal safety of the emergency repair personnel during the repair process, and prevent the secondary interruption of the optical cable during the repair process.


When dealing with a hang-up fault of the optical cable, you should first perform a two-way test on the optical cable at the fault point with an OTDR, and check the crossing poles, joint boxes, reservations, etc. within the range of 3-5 poles at both ends of the breakpoint to see if there is any optical cable. Feed break damage, see if there are other damage points, and then deal with it in a targeted manner.


When the vehicle hangs up, a pole and a ladder should be prepared to temporarily hold up the cross-road optical cable. After the repair is completed, the cross-road should be raised, the height should be replaced, and the cross-road sign should be attached.


3. Fire

Optical cable faults caused by fire generally do not cause simultaneous interruption of services, and core-by-core interruption is a typical feature of fire faults. After the emergency repair personnel arrive at the scene, they will first find out the situation on the scene, put out the fire first, and protect the damaged optical cable. Regardless of overhead or pipeline fire, usually multiple optical cables are melted and bonded to each other, and the identification of optical cables is the difficulty of fault repair. When you arrive at the fault site, do not rush to cut off the fiber optic cable strength core, especially do not cut multiple fiber optic cable strength cores at the same time. When cutting, it is necessary to mark both ends of the ignition point, so as to facilitate repairing and welding without connecting the wrong optical cable.


This type of failure ensures that all the high-temperature damaged optical cable segments are cut off before welding, so as to avoid rework of the damaged optical cable after the welding starts.


4. Crash the power pole

The optical cable was interrupted due to the traffic construction vehicle hitting the power pole. After arriving at the scene, set up warning signs, delineate the safety area for emergency repair, arrange special personnel to instruct pedestrians passing by, and conduct two-way tests on the optical cable during emergency repair to see if there are other breakpoints. After the repair is completed, the broken pole should be replaced as soon as possible. , and painted with warning paint.


When repairing this kind of fault, pay attention to using OTDR to conduct two-way testing, and check the places where the poles pass, the joint box, and the reservation within the range of 3-5 poles at both ends of the breakpoint to see if there is any damage to the optical cable. There are no other points of damage, which are then addressed in a targeted manner.


5. Robbery and vandalism

Criminals cut or maliciously damage the optical cable, causing the optical cable to be blocked. After this kind of fault occurs, the two-way test of the optical cable should be carried out first when arriving at the scene. The fault caused by stealing generally occurs in remote areas, and there are many cut points, and it is easier to find. When repairing, remember to check whether there are other break points in the surrounding area. Start welding again, and lay out the optical cable in one step, so as to avoid finding any breakpoints after the welding is completed.


The focus of human damage troubleshooting is the easy-to-touch positions on the optical cable routing. Because some damaged optical cables are only partially interrupted, it is difficult to find out the fault points in a short time. Arrange on-site personnel to cooperate with the test personnel in the equipment room to locate the position of the feeder cable by means of the feeder cable. After determining the position of the feeder cable before and after the fault point (within 100 meters is recommended), immediately lay out the optical cable to replace the cutover. Regardless of theft or vandalism, the police must be reported as soon as possible.


6. Such failures as dog bites, rat bites, bird pecks, and gunshots are small-probability events. Strengthening daily inspections and optical cable protection can avoid such failures. In the early stage of such faults, most of them are single-core. When the service is less affected, the core is jumped first to restore the service and then locate and find the fault point. Due to the difficulty of fault locating, the fiber optic cable is generally repaired by replacement and cutover.


7. The aging core of the fiber is naturally broken. Since the optical fiber is drawn from glass and plastic fibers, it is relatively fragile. In theory, static fatigue will occur with the passage of time, and the optical fiber will gradually age and cause natural fiber breakage. In the actual use of optical cables, there are few optical cable segments with a service life of more than 15 years, so the probability of natural fiber core aging is low. The external force of the optical cable is damaged, the encapsulation of the splice box is not standardized, the fiber splicing disk is not qualified, and the quality of the splicing is poor.


When dealing with faults, the core is mainly restored, and then the optical cable is repaired by replacing (repairing) cutover.


8. Natural disasters

Under the premise of ensuring personal safety, the emergency repair will be completed in the shortest time. In the case of large-scale natural disasters, it is very likely that large-scale mobile phone communication will be interrupted. Emergency repair personnel should be equipped with walkie-talkies or multi-operator mobile phones to ensure smooth communication during the repair process.


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