SDH故障分析（SDH fault analysis）.doc

SDH故障分析（SDH fault analysis） SDH transmission failure analysis The daily maintenance of transmission system often requires us to locate and eliminate all kinds of faults. The key to fault location is to accurately locate the fault point to the single panel and then troubleshoot. This needs to have a clear understanding of the cause of the failure, the thought and method of processing, so that it can achieve the effect of half the effort. Basic principles of transmission fault location It is well known that the transmission fault location should follow the principle of first, after the first, after the repair, after the external transmission, after the first single station, after the first line, after the first step, the lower level. 1. First grab and then repair In case of failure, the system maintainer must first rob the business and then repair it. If there is a transmission network alarm failure affect the business case, as in the 2 mbit/s business channels in LOS alarm signal loss, caused by exterior reason of light alarm, and the unit disc UnitFailure of failure (unit) the alarm conditions such as fault, the must first repair business. However, the first prerequisite for the business is the availability of the available channel resources at the same starting point as the failure channel or the same available backup board as the fault plate. 2. External and post-transmission In case of failure, the external factors should be excluded, such as broken fiber, terminal equipment failure, power supply or engine room environment, etc., then the transmission system reason is searched. When there may be external factors affecting the transmission network alarm failure, such as the device temperature alarm, the light road alarm, the network element failure alarm, also need to follow this principle. First stop single stop It is necessary to locate the site to the panel before locating the cause of the transmission equipment failure. When a general device fails, it is not j