Synchronization of asynchronous data signals

Details Synchronization of asynchronous data signals Synchronization of asynchronous data signals

H - Electricity

04

J

328/87

H04J 3/07 (2006.01)

Patent

CA 1296394

SYNCHRONIZATION OF ASYNCHRONOUS DATA SIGNALS Abstract of the Disclosure A method of and apparatus for synchronizing an asynchronous DS1 signal to produce a synchronized signal in the SONET format is described. The asynchronoussignal is stuffed in dependence upon a stuff request signal which is produced from a comparison with a threshold level of a phase difference between read and write phases with which the synchronized and asynchronous signals are respectively read from and written into an elastic store. The phase detection and threshold comparison are effectedsynchronously with the respective signals. To this end, the read address for the store is latched in synchronism with the synchronized frames, and its difference from the write address and the resulting threshold level comparison is effected in synchronism with the write clock for the store and hence with the asynchronous signal. The synchronizer provides a reduced waiting time jitter in the synchronized signal.

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