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Problem Description
OSN3500 equipment network element C, using two sets of STM-1 optical ports with two 155M SNCP rings (ring one and ring two), ring one has M1000V3 equipment network element A, ring two has M1000V3 equipment network element B, A and B have 2M tributary services opened to the central computer room network element D (OSN3500) 2M tributary board port 1 and port 2, respectively, for details, see Figure 1. Network Diagram 1", one day ring one and ring two line fiber optic cable cutting, after the end of the transmission equipment, there is no abnormal alarm and performance events, but the switching side reflects the ring one and ring two on the base station service interruption.
Alarm messagesNone
Processing 1、Check the service configuration, there is no problem, and the line cutover has not changed the transmission service, so exclude the service configuration error;
2、Transmission side does not have any alarm, indicating that there is no problem on the transmission side of the 2M service between A, B and D, and there should not be any problem on the 2M port docking between A, B and D and the switching equipment;
3、A, B, and D 2M ports are doing the external loopback, and the switching side reflects normal, so it can be excluded that the transmission and switching 2M docking problem isTransmission and switching 2M docking problems can be ruled out;
4, A network element 2M tributary board services within the loopback, the corresponding 2M ports in the D station table test, found that there is a frame out-of-step alarm;
5, in the D station corresponding to the B station services to activate the results of the A station tributary board PS inversion occurred, and the A station services to return to normal, suspecting that the optical fiber connection is wrong;
6, through the modification of J0 bytes to check the connection between the A, B, and the network elements of network elements of the C, and found that network elements of network elements of CRing 1 and Ring 2 each have a pair of fibers and network management equipment on the fiber relationship is inconsistent, misplaced each other, see the attached figure "network diagram";
7, modify the wrong way to connect the fibers, troubleshooting.
2、Transmission side does not have any alarm, indicating that there is no problem on the transmission side of the 2M service between A, B and D, and there should not be any problem on the 2M port docking between A, B and D and the switching equipment;
3、A, B, and D 2M ports are doing the external loopback, and the switching side reflects normal, so it can be excluded that the transmission and switching 2M docking problem isTransmission and switching 2M docking problems can be ruled out;
4, A network element 2M tributary board services within the loopback, the corresponding 2M ports in the D station table test, found that there is a frame out-of-step alarm;
5, in the D station corresponding to the B station services to activate the results of the A station tributary board PS inversion occurred, and the A station services to return to normal, suspecting that the optical fiber connection is wrong;
6, through the modification of J0 bytes to check the connection between the A, B, and the network elements of network elements of the C, and found that network elements of network elements of CRing 1 and Ring 2 each have a pair of fibers and network management equipment on the fiber relationship is inconsistent, misplaced each other, see the attached figure "network diagram";
7, modify the wrong way to connect the fibers, troubleshooting.
Root Cause1, business configuration error;
2, there should not have a loopback;
3, wrong fiber connection;
Recommendations and Summary1, the absence of alarms and performance events on the transmission does not mean that there is no problem on the transmission side;
2, the end of the fiber optic cable cut involving the transmission side should be carefully checked after the end of the new equipment docking relationship, be sure to ensure that and the original docking relationship is the same;
3, the handling of faults diligently use the meter to instrumentation reflected in the results shall prevail.
2, the end of the fiber optic cable cut involving the transmission side should be carefully checked after the end of the new equipment docking relationship, be sure to ensure that and the original docking relationship is the same;
3, the handling of faults diligently use the meter to instrumentation reflected in the results shall prevail.
END
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