| 摘要 |
<p>A clock recovery method and apparatus is provided. The high order demultiplexing -demapping unit (102) demultiplexes and demaps the high order OTN frame (101) into N low order ODTUjk frames (103), and transmits the N low order ODTUjk frames (103) to the low order demapping unit (104); the low order demapping unit (104) respectively demaps the N ODTUjk frames (103) into N ODUj frames (105), and writes the ODUj frames from memory unit 1 (106) to memory unit n (108) into memory unit n+1 (109) to memory unit 2n (111) by using the clock signal whose gaps are uniformly distributed; the ODUj frame clock generating unit (113) adjusts the read out clock in memory unit n+1 (109) to memory unit 2n (111), i.e. ODUj frame clock (114), according to the data volume stored in memory unit n+1 (109) to memory unit 2n (111). The embodiments of the invention effectively filter a great deal of jetter generated during the mapping and demapping process, and can recover high quality clock signal from the high order OTN frame (101), so as to meet the jetter requirement of the OTN service.</p> |
