H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/24 (2006.01) H04J 3/07 (2006.01) H04L 7/00 (2006.01)
Patent
CA 2324535
Pointer justification event induced low frequency jitter is attenuated during desynchronization of a synchronous input data stream into a plesiosynchronous output data stream. The output data stream has a clock rate T and is made up of tb byte multi-frames containing a nominal number tdb of data bits (tdb = 772 and tb =104 for T1 data; tdb =1024 and tb =140 for E1 data). An integer number pc of phase adjustment commands are provided (in the preferred embodiment, pc =12 for T1 data and pc = 9 for E1 data). A count having a total value pjT, where 1 <=spjT<=stb, is maintained of the total number of positive point- er justification events previously encountered in the data stream. A separate count having a total value pcT, where 1 <=spcT<=tdb*pc, is maintained of the total number of previously issued phase adjustment commands. If a positive pointer justification event is detected in the data stream, pjT is incremented by one. If a negative pointer justifica- tion event is detected in the data stream, pjT is decremented by one. If, at any time, tdb/tb*pjT*pc > pcT, then positive phase adjustment commands are issued and pcT is incremented by one for each issued positive phase adjustment command, until tdb/tb*pjT*pc = pcT. If, at any time, tdb/tb*pjT*pc < pcT, then negative phase adjustment com- mands are issued and pcT is decremented by one for each issued nega- tive phase adjustment command until tdb/tb*pjT*pc = pcT. The rate of command issuance can be adaptively varied as a function of the magni- tude of the difference between pcT and tdb/tb*pjT*pc. The clock rate T is varied by adding the issued positive phase adjustment commands to the clock rate T and subtracting the issued negative phase adjustment commands from the clock rate T as the phase adjustment commands are issued.
Mok Winston
Schatz Ryan Richard
Walsh John Norman
Oyen Wiggs Green & Mutala Llp
Pmc-Sierra Inc.
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