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Typical case of fiber optic cable failure 2
On March 23, 2011, the Man fiber optic cable failed. The relay part was a fiber optic cable with 144 Gangnan No. 6 cables.
After warning, the repairer immediately tested the defective fiber optic cable. The analysis showed that the failure was formed by the six offices of Jiangnan Unicom. The results showed that the fragmentation occurred primarily at the intersection of Xiamen Street and Jilin Street in the south of the Yangtze River, where the construction company was located.
Open the junction box and see that one end of the optical cable is interlaced by a reinforced heart, and a part of the optical fiber is broken. The fiber optic cable center was released immediately, and Vadian and Pan's base station recovered their services. The reason for the failure was that the optical cable box was taken out of the well during the construction of the construction office.
Case analysis of fiber optic cable failure
The cause of the failure is that the fiber optic cable reinforcement core is improperly fixed in the sealed box. When the manufacturer removes the box from the fiber optic cable connector from the well, the fiber optic cable rotates and the fibers are then interlaced by the reinforcing core. During construction, ensure that the charging core is fixed in the optical cable connection box to prevent similar defects.
There are two circles on the fault, one circle in Huashun and the other circle in Pan's daily repair. There are many similar lines. There are many such pseudo-circular lines in mobile LAN lines. It is necessary to identify false loops, improve loop network lines, and prevent large-scale mobile base stations.
On July 7, 2011, the original optical fiber and cable of the Relay Department of Jilin Province was blocked. Correcting the walls of the Eighth Lake Bridge and converting directly buried optical fiber cables into aerial optical fiber cables are the primary reasons for the incision.
At zero hour, when the disconnector was blocked, they immediately received a call from the local network administrator. The small branch of the ZTE branch was closed. At the same time, the connection work of the incision point has been completed, the local network management work has been recovered, and the cracked heart in the western ring of the province has not yet recovered. After telling the local incision staff, a test conducted in the machine room confirmed the defect points near the incision point. The cracking of the core is due to the cracking of the pipe of the optical cable at the cutting point, which causes the optical cable core to crack at 5.2 meters from the sealing point. After the heart breaks, the optical cable is connected from the head, and the network confirms the complete rehabilitation activity.
Two positioning wave loops (Zte and Huawei) were opened in the first fiber optic cable of 18 centers in Jilin Province. The two rings are stacked together on the case. When disturbance occurs, the stack is operated, and a single ring disturbance occurs at the end of the smelting.
Lessons learned include: (1) Before incision, it is necessary to control the opening of the incision system and confirm the operation of the incision point together with the relevant network management department; (b) The preparation of the incision point must be sufficient, especially It is the preparation of the chaotic incision point, and all possible accidents must be considered.
Typical case of fiber optic cable failure 4
On May 20, 2012, it was discovered that the bistatic nuclear was partially cracked at 48 to 9 sites. A hook machine was found 6 kilometers away from the line. We prepared a pipe near the lead rod. During the production process, the hook machine encountered A guiding optical cable caused damage to the head of the underground duct of the guiding optical cable. The damage was hidden and not completely closed, resulting in partial cracking of the fiber core.
At that time, the rescue team did not find the proper point of failure on the scene. The box was found near the fault point. The fiber was extracted from the box. When processing the sealed box, the user’s fiber optic cable at the ball factory cracked the L core, and the data reported to the ball factory was frozen. The tinker repaired the box immediately. Finally, the urgent patching machine retracts the optical fiber through the rotating optical fiber.
The lessons learned are as follows: (1) The poles and roads of the local area network are more messy, and many poles and roads are connected to multiple optical fiber cables. When dealing with faults, the faulty optical cables should be distinguished, and other faults should not be formed. (B) When there are many optical cables and the opening operation fails, defibrillation is not used. The reasons are as follows: (1) I don't understand the location of the ODF cabin and the opening of the system.
(2) The machine room identification may be inaccurate, which may easily lead to other secondary failures. (3) Inverted fiber can shorten the duration of failure, but it requires a lot of work and requires higher requirements for spare fiber. c) When dealing with such failures, you should quickly find the point of failure on the scene, and even find the hidden optical cable breakpoint. After the failure point was discovered, because the network management monitors some users, it is impossible to present multiple faults, but the network management did not find it, so there were no other defects, because the same optical cable failure and other failures occurred during urgent repair. Skilled personnel experience in fiber optic cable failure
