Multiplex communications – Wide area network – Packet switching
Patent
1989-05-26
1990-05-22
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375118, H04J 307
Patent
active
049282751
ABSTRACT:
A method of and apparatus for synchronizing an asynchronous DS1 signal to produce a synchronized signal in the SONET format is described. The asynchronous signal 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 effected synchronously 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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McEachern James A.
Moore Thomas E.
Wight Mark S.
Haley R. John
Hsu Alpus H.
Northern Telecom Limited
Olms Douglas W.
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