Alcatel Network Systems, Inc.

Alcatel Na, Inc.,

Keith L Bernhardt

Richard Marion Czerwiec

Joseph E Sutherland

William B Weeber

Timothy J Williams

William E Powell

Joseph Lee Smith

Michael J Gingell

Ertugrul Baydar

Claude M Hurlocker

Raymond E Tyrrell

Dale L Krisher

William J Fox

Richard W Peters

William H Stephenson, Jr

Richard J Sanders, Jr

Stephen C Dunning

Gus C Sanders, Jr

Hal A Thorne

Francis G Noser

Jak Yaemsiri

Jeffrey P Jones

Camille A Abu-Saba

Michael Sutton

O Lamar Bishop

M Rodney Briscoe

Kenneth J Stoia

V Paul Runyon

Heinrich T Sonnenberg

Patrick M Farrell

Victor W Wilkerson

Mohammad S Arani

Dana Merrill

Wenkwei Rou

A synchronous optical transmission system for interfacing SONET formatted channels to lower speed channels in either a SONET format or otherwise. The transmission system incorporates a fiber transmission system, terminal multiplexers and add/drop multiplexers that in turn incorporate a plurality of features, such as parallel scrambling circuitry, frame synchronization circuitry and the like.

Synchronous optical transmission system

An add/drop interface is connected in series with a data bus and is constructed for receiving an add/drop module. The add/drop interface includes a data selection multiplexer which receives through data from the data bus and add/drop from the module and selects the proper output data in response to a signal received from a controller in said interface. The controller provides a signal to drive the data selection multiplexer to select the add/drop data only after all transient signals resulting from module connection have dissipated. The controller also provides error checking so that the through data is selected if errors are detected. Timing circuitry in the interface maintains the correct phase relationship between through data and add/drop data.

Protected information transfer system

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Raleigh, NC, United States of America

Keith L Bernhardt