System for cross-connecting high speed digital SONET signals

• US 4,967,405 A
• Filed: 12/09/1988
• Issued: 10/30/1990
• Est. Priority Date: 12/09/1988
• Status: Expired due to Term

• Current Assignee: Transwitch Corporation
• Original Assignee: Transwitch Corporation
• Inventors: Cochran, William T., Upp, Daniel C.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Marcelo, Melvin
• Application Number:
  US07/283,172
• Time in Patent Office: 690 Days
• Field of Search: 370/1, 370/4, 370/58.1, 370/60.1, 370/99, 370/59, 370/84, 340/825.8
• US Class Current: 398/50
• CPC Class Codes: H04J 3/08 Intermediate station arrangements, e.g. for branching, for tapping-off
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN

Abstract

A modular, expandable, non-blocking system for cross-connecting high speed digital signals is provided. The system is capable of connecting DSn, CEPTn, and STSn signals as desired, with lower rate signals being included as components of the high-rate signals or terminating on low speed lines, as desired. The system accomplishes its goals by converting all incoming signals into a substantially SONET format, and by processing all the signals in that format. The signals are typically cross-connected in the substantially SONET format, although an expandable non-blocking wide band cross-connect module is provided which cross-connects any like signals. If the outgoing signal is to be in other than SONET format, the substantially SONET formatted signal is reconverted into its outgoing format. To create a complete system, various modules are utilized, including: add/drop multiplexer means for add/drop applications of DS-0, DS-1, CEPTn signals, etc.; a SONET bus interface; a virtual tributary cross-connect module which cross-connects virtual tributary payloads in space, time, and phase to generate new substantially SONET formatted signals; a wide band cross-connect module; a DS-3/SONET converter; and front end interfaces including a DS3 line interface, and various STSn interfaces. The modules may be mixed and matched as desired to accommodate a multitude of applications.

Claims

1. A modular, expandable, cross-connect system for high speed SONET digital signals, comprising:

(a) receiving means for receiving at least one signal formatted in a substantially SONET format;

(b) transmitting means for transmitting at least one cross-connected substantially SONET formatted signal; and

(c) cross-connection means coupled to said receiving means and said transmitting means for cross-connecting said substantially SONET formatted signal from said receiving means to said transmitting means, wherein

said cross-connection means comprises at least a virtual tributary cross-connection means, said virtual tributary cross-connection means comprising;

SONET signal receiving means for receiving a plurality of substantially SONET formatted signals, including means for disassembling said substantially SONET formatted signals into virtual tributary payloads of tracked phase, and

means for cross-connecting said virtual tributary payloads in space, time, and SONET phase to generate a new substantially SONET formatted signals.

2. A system according to claim 1, wherein:

said transmitting means is coupled to an STS-1 line and comprises a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a bit serial SONET formatted signal output therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and for providing line interface functions to permit said bit serial SONET formatted signal to be transmitted on said STS-1 line.

3. A system according to claim 1, wherein:

said transmitting means is coupled to an STSn line, where n is greater than one, and said transmitting means comprises

a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and

a multiplexer means for receiving and multiplexing at least two of said SONET signals from a plurality of said SONET path terminating means to create a bit serial STSn formatted output signal where n is greater than one, and for providing line interface functions to permit said bit serial STSn formatted signal to be transmitted on said STSn line.

4. A system according to claim 1, wherein:

said transmitting means is coupled to an STSn line, where n is greater than three, and said transmitting means comprises

a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal,

a first multiplexer means for receiving and multiplexing at least three of said SONET signals from a plurality of said SONET path terminating means to create a first STSn formatted signal where n is greater than one,

a second multiplexer means for receiving, multiplexing, and scrambling a plurality of said first STSn formatted signals to create a second STSn formatted signal where n is greater than three, and

a line interface means for receiving said second STSn formatted signal, for providing a second bit serial STSn formatted signal therefrom, where n is greater than three, and for interfacing said second STSn formatted signal to said STSn line of same bit rate.

5. A system according to claim 2, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

6. A system according to claim 3, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

7. A system according to claim 4, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

8. A system according to claim 2, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

9. A system according to claim 3, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

10. A system according to claim 4, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

11. A system according to claim 2, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

12. A system according to claim 3, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

13. A system according to claim 4, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said virtual tributary cross-connect means.

14. A system according to claim 1, further comprising:

(d) non-blocking wide band cross-connecting means including a plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

15. A system according to claim 14, wherein:

said non-blocking wide band cross-connecting means is coupled to said virtual tributary cross-connect means.

16. A modular, expandable, cross-connect system for high speed SONET digital signals, comprising:

(a) receiving means for receiving at least one signal formatted in a substantially SONET format;

(b) transmitting means for transmitting at least one cross-connected substantially SONET formatted signal; and

(c) cross-connection means coupled to said receiving means and said transmitting means for cross-connecting said substantially SONET formatted signal from said receiving means to said transmitting means, wherein

said cross-connecting means comprises a non-blocking wide band cross-connecting means including plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

17. A system according to claim 16, wherein:

said transmitting means is coupled to an STS-1 line and comprises a SONET path terminating means coupled to said non-blocking wide band cross-connect means for receiving a substantially SONET formatted signal, for creating a bit serial SONET formatted signal output therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and for providing line interface functions to permit said bit serial SONET formatted signal to be transmitted on said STS-1 line.

18. A system according to claim 16, wherein:

said transmitting means is coupled to an STSn line, where n is greater than one, and said transmitting means comprises

a SONET path terminating means coupled to said non-blocking wide band cross-connect means, for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and

a multiplexer means for receiving and multiplexing at least two of said SONET signals from a plurality of said SONET path terminating means to create a bit serial STSn formatted output signal where n is greater than one, and for providing line interface functions to permit said bit serial STSn formatted signal to be transmitted on said STSn line.

19. A system according to claim 16, wherein:

said transmitting means is coupled to an STSn line, where n is greater than three, and said transmitting means comprises

a SONET path terminating means coupled to said non-blocking wide band cross-connect means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal,

a first multiplexer means for receiving and multiplexing at least three of said SONET signals from a plurality of said SONET path terminating means to create a first STSn formatted signal where n is greater than one,

a second multiplexer means for receiving, multiplexing, and scrambling a plurality of said first STSn formatted signals to create a second STSn formatted signal where n is greater than three, and

a line interface means for receiving said second STSn formatted signal, for providing a second bit serial STSn formatted signal therefrom, where n is greater than three, and for interfacing said second STSn formatted signal to said STSn line of same bit rate.

20. A system according to claim 17, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

21. A system according to claim 18, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

22. A system according to claim 19, wherein:

said receiving means is coupled to an STS-1 line and comprises a SONET path terminating means for interfacing said STS-1 line and said system.

23. A system according to claim 17, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide band cross-connect means.

24. A system according to claim 18, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide band cross-connect means.

25. A system according to claim 19, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than one, and comprises a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide band cross-connect means.

26. A system according to claim 17, wherein

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide-band cross-connect means.

27. A system according to claim 18, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide-band cross-connect means.

28. A system according to claim 19, wherein:

said receiving means is coupled to an STSn line and receives an STSn formatted signal, wherein n is greater than three, and comprises a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n SONET path terminating means for providing substantially SONET formatted signals from each STS-1 signal, wherein at least one of said SONET path terminating means is coupled to said non-blocking wide-band cross-connect means.

29. A modular, expandable cross-connect system for high speed SONET digital signals, comprising:

(a) a plurality of receiving/transmitting means each for receiving at least one signal formatted in a substantially SONET format and for transmitting at least one cross-connected substantially SONET formatted signal; and

(b) cross-connection means coupled to at least two of said receiving/transmitting means for cross-connecting said substantially SONET formatted signal from a first of said receiving/transmitting means to a second of said receiving/transmitting means,

said cross-connection means comprises at least a virtual tributary cross-connection means, said virtual tributary cross-connection means comprising,

SONET signal receiving means for receiving a plurality of substantially SONET formatted signals, including means for disassembling said substantially SONET formatted signals into virtual tributary payloads of tracked phase, and

means for cross-connecting said virtual tributary payloads in space, time, and SONET phase to generate new substantially SONET formatted signals.

30. A system according to claim 29, wherein:

said receiving/transmitting means is coupled to an STS-1 line and comprises

a transmit section having a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a bit serial SONET formatted signal output therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and for providing line interface functions to permit said bit serial SONET formatted signal to be transmitted on said STS-1 line, and

a receive section having means for interfacing said STS-1 line and said system.

31. A system according to claim 29, wherein:

said receiving/transmitting means is coupled to an STSn line, where n is greater than one, and said receiving/transmitting means has a transmit section having

a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and a multiplexer means for receiving and multiplexing at least two of said SONET signals from a plurality of said SONET path terminating means to create a bit serial STSn formatted output signal where n is greater than one, and for providing line interface functions to permit said bit serial STSn formatted signal to be transmitted on said STSn line, and

a receive section having a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n interface means for interfacing each SONET STS-1 signal to said system.

32. A system according to claim 29, wherein:

said receiving/transmitting means is coupled to an STSn line, where n is greater than three, and said receiving/transmitting means comprises

(1) a transmit section having

a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal,

a first multiplexer means for receiving and multiplexing at least three of said SONET signals from a plurality of said SONET path terminating means to create a first STSn formatted signal where n is greater than one,

a second multiplexer means for receiving, multiplexing, and scrambling a plurality of said first STSn formatted signals to create a second STSn formatted signal where n is greater than three, and

a line interface means for receiving said second STSn formatted signal, for providing a second bit serial STSn formatted signal therefrom, where n is greater than three, and for interfacing said second STSn formatted signal to said STSn line of same bit rate, and

(2) a receive section having a first demultiplexing means for descrambling and demultiplexing said STSn signal into a plurality of unscrambled composite parts, a second demultiplexing means for demultiplexing said unscrambled composite parts into n STS-1 formatted signals, and at least n interface means for interfacing each SONET STS-1 signal to said System.

33. A system according to claim 29, further comprising:

(c) non-blocking wide band cross-connecting means including a plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

34. A system according to claim 30, further comprising:

(c) non-blocking wide band cross-connecting means including a plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

35. A system according to claim 31, further comprising:

(c) non-blocking wide band cross-connecting means including a plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

36. A modular, expandable cross-connects system for high speed SONET digital signals, comprising:

(a) a plurality of receiving/transmitting means each for receiving at lest one signal formatted in a substantially SONET format and for transmitting at least one cross-connected substantially SONET formatted signal; and

(b) cross-connection means coupled to at least two of said receiving/transmitting means for cross-connecting said substantially SONET formatted signal from a first of said receiving/transmitting means to a second of said receiving/transmitting means,

said cross-connecting means comprises non-blocking wide band cross-connecting means including a plurality of data ports and a plurality of associated clock ports, and means for cross-connecting at least said substantially SONET formatted signals received at a first data port along with an associated clock signal received at an associated clock port to respective any of said plurality of data ports and associated clock ports, wherein at least a first group of said plurality of data ports and associated clock ports are coupled to said receiving means, and at least a second group of said plurality of data ports and associated clock ports are coupled to said transmitting means.

37. A system according to claim 36, wherein:

said receiving/transmitting means is coupled to an STSn line, where n is greater than one, and said receiving/transmitting means has a transmit section having

a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a SONET formatted signal therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and a multiplexer means for receiving and multiplexing at least two of said SONET signals from a plurality of said SONET path terminating means to create a bit serial STSn formatted output signal where n is greater than one, and for providing line interface functions to permit said bit serial STSn formatted signal to be transmitted on said STSn line, and

a receive section having a demultiplexing means for demultiplexing said STSn signal into n SONET STS-1 signals, and at least n interface means for interfacing each SONET STS-1 signal to said system.

38. A system according to claim 36, wherein:

said receiving/transmitting means is coupled to an STS-1 line and comprises

a transmit section having a SONET path terminating means coupled to said virtual tributary cross-connection means for receiving a substantially SONET formatted signal, for creating a bit serial SONET formatted signal output therefrom by inserting at least path and transport overhead information in said substantially SONET signal, and for providing line interface functions to permit said bit serial SONET formatted signal to be transmitted on said STS-1 line, and

a receive section having means for interfacing said STS-1 line and said system.