论文部分内容阅读
由于近些年在各主要通信干线中广泛地建立了以DWDM为主的传输系统,DWDM的地位日益重要,因此通过DWDM系统传送时钟也日益得到重视。利用DWDM传送时钟的方式有两种:一种是利用波分系统透明传输的特性,将SDH线路光信号通过波长转换单元(OTU:OpticalTransponderUni)t加载到波分系统上进行传输;另一种是利用带外信号(如:1625nm波长)传送时钟信号。
Due to the widespread establishment of DWDM-based transmission systems in all major communication links in recent years, the status of DWDM is becoming increasingly important. Therefore, the transmission of clocks through DWDM systems is gaining more and more attention. There are two ways to transmit the clock by using DWDM: one is to utilize the characteristic of the transparent transmission of the wavelength division system, and the optical signal of the SDH line is loaded onto the wavelength division system for transmission via the OTU (Optical Transponder Unit); and the other is The use of out-of-band signals (such as: 1625nm wavelength) to send clock signals.