A PRELIMINARILY ANALYSIS OF CHARACTERISTICS OF CODE ERROR AND TIME DELAY OF PROTECTIVE RELAYING SIGNALS TRANSMITTED BY SDH OPTICAL FIBRE COMMUNICATION SYSTEM

According to the clauses relevant to the code error and time delay in the signal channel in the technical standard for the power dispatching and communication, the characteristics of code error and time delay in transmission are analyzed and some calculations are performed and discussed. Some practical examples are enumerated, and it is proved that SDH devices can satisfy the requirement of the transmission quality and time delay of protection signals according to the measured data of SDH products from some manufacturers. Therefore, the SDH devices can be used as the channel for protection signals. At the same time, it is suggested that in the planning of special power communication network the multiplexing of protection signals should be considered to improve the utilization rate of the channel and reduce its investment.