Switching apparatus for digital signals

Details Switching apparatus for digital signals Switching apparatus for digital signals

1992-04-10

1995-08-08

Chin, Stephen

Pulse or digital communications

Synchronizers

370108, 3408252, 34082579, H04L 400

Patent

active

054405912

ABSTRACT:
A circuit for preserving a predetermined timing relationship between a synchronization signal including periodic sync codes and a digital signal composed of successive frames of which the nominal duration is equal to the period of the sync codes includes a delay device connected to receive the digital signal. The delay device is selectively adjustable to impose a controllable delay on propagation of the digital signal. A FAW detector detects a frame alignment word in the digital signal, and a time measurement circuit measures the time that elapses between occurrence of a sync code and detection of a frame alignment word. A delay adjustment circuit is responsive to the time measurement circuit to adjust the delay imposed by the delay device.

REFERENCES:
patent: 4352181 (1982-09-01), Le Dieu et al.
patent: 4472802 (1984-09-01), Pin et al.
patent: 4774705 (1988-09-01), Eaves, Jr.
patent: 4775987 (1988-10-01), Miller
patent: 4797589 (1989-01-01), Collins

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