Pointer adjustment wander and jitter reduction apparatus for...

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

Reexamination Certificate

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C370S516000, C375S372000

Reexamination Certificate

active

06882662

ABSTRACT:
An apparatus for reducing the effects of pointer adjustments, wander, and jitter during desynchronization of a non-uniformly gapped data stream from a payload of a synchronized signal is disclosed. The apparatus utilizes a combination of two pointer adjustment signals embedded in the synchronized signal to determine a bit leak rate of bits from an elastic store following a pointer adjustment event such that the elastic store provides as an output a more-uniformly-distributed-gapped data stream.

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“Design and Performance Verification of a SONET-to-DS3 Desynchronizer” R.W. Hamlin and B. Parruck, Proc. IEEE Globecomm '91, pp 761-764, 1991.
“Cancellation of Pointer Adjustment Jitter in SDH Networks”, H. Sari and G. Karam, IEEE Transactions on Communications, V42, No. 12, pp 3200-3207, 12/94.
“Synchronous Optical Network (SONET)—Jitter at Network Interfaces” Standard Committee T1 Telecommunications, T1X1.3/2001-008, T1.105.03, pp 1-42; with Annex H “DSI Wander Budget” pp. 1-11.

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