Asynchronous-synchronous digital transmission signal conversion

Details Asynchronous-synchronous digital transmission signal conversion Asynchronous-synchronous digital transmission signal conversion

1990-05-30

1992-07-14

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375112, 370102, 369 60, H04L 704, H04L 2536

Patent

active

051310139

ABSTRACT:
Asynchronous-synchronous digital signal conversion and vice versa are realized by employing a single synchronizing elastic store and associated phase detector. The signal smoothing and synchronization processes are achieved with a single elastic store by low pass filtering the elastic store write-read address separation signal from the phase detector to obtain a smooth stuff control signal. In turn, the smooth stuff control signal is employed to make a stuff decision for controlling the elastic store read clock signal. In a specific embodiment the low pass filtering is realized by first synchronously sampling the write-read address separation signal and, then, employing a digital low pass filter to obtain the aliasing free smooth stuff control signal.

REFERENCES:
patent: 4667324 (1987-05-01), Graves
patent: 4884268 (1989-11-01), Goto
patent: 4928275 (1990-05-01), Moore et al.
American National Standard for Telecommunications, "Digital Hierarchy Optical Interface Rates and Formats Specifications (SONET)", dated Feb. 1990.
Technical Advisory, TA-TSY-000253. Issue 4, "Sonet Transport Systems: Common Generic Criteria", Bell Communications Research, Feb. 1989.
Globecom'85, IEEE Global Telecommunications Conference, Conference Record vol. 3 of 3, "SONET (Synchronous Optical Network)", R. J. Roehm et al., pp. 1443-1450.

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