关键词: 复用映射, 同步时钟, 均匀缺口

Abstract:

In order to simplify the clock circuit design of optical data unit in optical transport network and reduce costs,a synchronization circuit based on uniform gap clock is proposed.First,the generation of gap synchronous clock is achieved by using the asynchronous FIFO;then a multiplexing and mapping circuit using the synchronous clock with a notch is designed to handle different types of optical data unit,to achieve the absorption of the signal frequency offset,clock data recovery,and forward error correction.The proof by circuit simulation shows the program can achieve the same performance as traditional programs,but the design and implementation of the circuit are simple and economical by using a virtual clock instead of phase-locked loop.

Key words: multiplexing and mapping;synchronization clock;uniform gap