US 5,185,736 AGranted

Synchronous optical transmission system

AssigneeAlcatel NA Network Systems Corp.

InventorsRaymond E. Tyrrell, O. Lamar Bishop, William E. Powell, Dale L. Krisher, William H. Stephenson, M. Rodney Briscoe, Hal A. Thorne, Claude M. Hurlocker, V. Paul Runyon, Timothy J. Williams, Joseph E. Sutherland, William B. Weeber, Michael J. Gingell, Kenneth J. Stoia, William J. Fox, Jeffrey P. Jones, Richard M. Czerwiec, Ertugrul Baydar, Heinrich T. Sonnenberg, Richard Peters, Gus C. Sanders, Richard J. Sanders, Jr., Francis G. Noser, Joseph L. Smith, Jak Yaemsiri, Camille A. Abu-Saba, Patrick M. Farrell, Wenkwei Rou, Victor W. Wilkerson, Mohammad S. Arani, Stephen C. Dunning, Keith Bernhardt, Dana Merrill, Michael Sutton

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Abstract

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.

A synchronous optical transmission system for interfacing with high speed communication channels conforming to the synchronous optical network (SONET) standard so as to convey information to and from said high speed channels operating at different transmission rates, as well as to and from at least one said high speed channel and lower speed channels conforming to other communication standards comprising:

A) a fiber transmission system (FTS) having;
1) means for interfacing to a communication medium operating at a first SONET high speed channel transmission rate;
2) means for interfacing to a second communication medium comprising a plurality of channels, each operating at a lower transmission rate than the first SONET high speed channel;
and
3) means for multiplexing said lower transmission rate channels to the first SONET channel as well as for demultiplexing the first SONET channel to the lower channels;
B) a terminal multiplexer (TM) having;
1) a means for interfacing to a SONET high speed channel;
2) a time slot multiplexer (TSM) having a lower speed output, the TSM interconnected to said interfacing means for cross-connecting lower speed channels to and from the SONET high speed channel at the lower speed output of the time slot multiplexer;
3) lower speed channel interfacing means connected to the lower speed output of the TSM for interfacing the lower speed output of the TSM with lower speed channels including means for reformatting the data of the lower speed channel so as to be compatible with the higher speed channel and for converting the formatting of the higher speed channel to the format of the lower speed channel;
and
4) means for controlling the cross-connect function of the TSM;
and
C) an add/drop multiplexer (ADM) comprising:
1) first means for interfacing to a SONET high speed channel at a first location,
2) a time slot multiplexer (TSM) having a lower speed output, the TSM interconnected to said add/drop multiplexing interfacing means for cross-connecting lower speed channels to and from the SONET high speed channel and a second SONET high speed channel as well as to and from the lower speed output of the TSM;
3) a lower speed channel interfacing means connected to the lower speed output of the TSM for interfacing the lower speed output of the TSM with lower speed channels including means for reformatting the data of the lower speed channel so as to be compatible with the higher speed channel and for converting the formatting of the higher speed channel to the format of the lower speed channel;
4) second means for interfacing to a SONET high speed channel at a second location;
and
5) means for controlling the cross-connect function of the TSM.

16 more elements

Abstract

Claims21