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This content describes the phenomenon when all the network elements in the subnet are offline, the impact on the system, the possible causes, the tools you need to troubleshoot the problem, the precautions, and the processing steps, etc. The U2000 LCT logs on to the network element, and restores the original IP of the network element according to the records. Check whether the network element is restored to normal, and if it is not restored, turn to other causes. When using the OTDR instrument to check the fiber, the SDH single-board optical interface is damaged because the wrong route is connected. Therefore, when using the OTDR instrument, pay special attention to the correctness of the test distance and routing connection.
The OSN3500 SSN3SL16 single-board has three versions: N1, N2, and N3, and the main difference between the three versions is whether or not they support the TCM function and configure the AU-3 service.The N1SL16 and N2SL16 single-boards have been discontinued.The SL16 optical interface board belongs to the line single-boards, and it can be used to realize the receiving and transmitting of STM-16 optical signals on the OptiX OSN series equipment.The SL16 optical interface board is a line veneer that can be used on OptiX OSN series devices to receive and transmit STM-16 optical signals. With this board, the SL16 sends the received optical signals to the crossover side through O/E conversion, while the electrical signals from the crossover side are sent out through E/O conversion.The single board consists of an optoelectronic conversion module, a multiplexing/demultiplexing module, an SDH overhead processing module, a logic control module and a power supply module.The single-board characterization code is the code located after the name of the single-board in the single-board bar code.The single-board characterization code of SL16 is used to describe the type of optical interface.
Phenomenon Description
Using OTDR to detect the fiber between two sites (A and B), since the fiber distance between the two sites is 105 km. SSN1SL1602 single board (L-16.2Je interface) is used at both sites. So the distance of the OTDR is set to 100 km in order to detect the fiber between the location 5 km from site B to site A. When connecting the OTDR to the ODF, the connection is wrong (connected to site B). The OTDR was activated to detect the fiber. After testing, the SSN1SL1602 veneer at Site B was found to be damaged.Cause Analysis
The OTDR has different output optical power for different distances. the overloaded received power of the L-16.2Je interface is -9 dbm. because of the connection of the wrong route, the OTDR sends more power to the L-16.2Je interface than its overloaded received power. so that the L-16.2Je interface is damaged.
References
Please note the following points when testing optical fibers with an OTDR:
- When installing the equipment, please clearly label the optical ports, pigtails and ODFs. to prevent incorrect operation during later maintenance.
- When using the OTDR, please determine the distance required for testing and double-check the connection of the ODF.
- When using the OTDR to test the optical fiber, the pigtail must be removed from the circuit board.
- When using a long-distance optical port, be sure to connect the routing correctly. Because long-distance optical ports receive low overload optical power, they are easily damaged by optical signals that exceed the overload optical power when connected to the wrong route.
The technical information in this chapter and the related SDH equipment troubleshooting procedures are provided by Shenzhen Optical Transmission Network Technology Company Limited (www.opticaltrans.com), and are reproduced with permission. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to telephone consultation!
