Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-10-17
1993-09-14
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
370102, 370108, H04L 700
Patent
active
052456366
ABSTRACT:
A device for reducing the jitter caused by pointer adjustments in a digital telecommunication network comprising of a circuit inserting in the vicinity of each phase step caused by a pointer adjustment, a plurality of smoothing phase steps in accordance with a deterministic smoothing pattern in order to eliminate, after having passed through a conventional desynchronizer, the quantifying effects of the phase steps. Provision also is made, for the case in which each phase step caused by a pointer adjustment comprises a plurality of bits, in that a control circuit is present to resolve the step into a plurality of elementary steps and to control the insertion of these steps in a manner matched to the rate of occurrence of pointer adjustments. In particular, the device applies to networks based on Synchronous Digital Hierarchy.
REFERENCES:
patent: 5052025 (1991-09-01), Duff et al.
patent: 5111485 (1992-05-01), Serack
"Sonet Desynchronizers", Feb. 1989.
"Results of Simulations of a Possible Desynchronizer Design", May 1989.
"Network Aspects of Pointer Adjustments", Mar. 1989.
Karam Georges M.
Sari Hikmet
Chin Stephen
Societe Anonyme de Telecommunications
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