Communication transmission network in sharply rising business situation become increasingly complex. The original fiber single-wave transmission and time-division multiplexing method

cannot meet the requirement of business. DWDM systems used in backbone transmission network

improve the transmission capacity. Made a start in the closed because of the DWDM system of SDH ring under the wavelength conversion and reuse solutions for reuse

intermediate transmission light relay points more

signal flow is directly connected fiber SDH ring complex

especially in dealing with across the board site error

need more stops. Therefore

the paper proposed a method of DWDM system error processing

and the railway corporation now network as an example

the backbone of southwest of DWDM error processing method are discussed in this paper.