Expandable telecommunications system

• US 5,544,163 A
• Filed: 03/08/1994
• Issued: 08/06/1996
• Est. Priority Date: 03/08/1994
• Status: Expired due to Term

• Current Assignee: Excel Switching Corp. (Enghouse Systems Limited)
• Original Assignee: Excel Incorporated
• Inventors: Madonna, Robert P.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US08/207,931
• Time in Patent Office: 882 Days
• Field of Search: 370/53, 370/54, 370/58.1, 370/58.2, 370/59, 370/60, 370/60.1, 370/61, 370/63, 370/65, 370/65.5, 370/66, 370/68, 370/68.1, 370/85.6, 370/85.9, 370/85.12, 370/85.13 , 370/85.14, 370/85.15, 370/94.1, 370/94.2, 370/94.3, 340/825.03, 340/826, 340/827, 340/825.05, 340/825.79, 340/825.8, 379/271, 379/272, 379/273, 379/279, 379/291, 379/335, 359/115, 359/117, 359/118, 359/135
• US Class Current: 370/352
• CPC Class Codes: H04L 12/43 with synchronous transmission, e.g. time division multiplex [TDM], slotted rings
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/5612 Ring
• CPC Class Codes: H04L 2012/6437 Ring
• CPC Class Codes: H04L 2012/6443 Network Node Interface, e.g. Routing, Path finding
• CPC Class Codes: H04L 2012/6459 Multiplexing, e.g. TDMA, CDMA
• CPC Class Codes: H04L 2012/6475 N-ISDN, Public Switched Telephone Network [PSTN]
• CPC Class Codes: H04L 2012/6481 Speech, voice
• CPC Class Codes: H04L 2012/6486 Signalling Protocols
• CPC Class Codes: H04L 49/105 ATM switching elements
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections
• CPC Class Codes: H04Q 3/002 Details
• CPC Class Codes: Y10S 379/909 Alternatives

Abstract

An open, high speed, high bandwidth digital communication network for connecting multiple programmable telecommunications switches to form a large capacity, non-blocking switching system. Each network switching node includes circuitry for transmitting and receiving variable-length, packetized information over the network, thus enabling each node to receive information from or transmit information to all other nodes. The network may carry any type of information present in the system including voice, data, video, multimedia, control, configuration and maintenance, and the bandwidth of the network may be divided or shared across various information types. Devices such as voice processing resources may also interface with the network, thereby gaining direct access to all information passing through the network. Also provided are methods and packet structures for communicating information over the network. Multiple networks may be interconnected to provide even greater switching capacity or voice processing capacity.

Claims

1. An expandable telecommunications system comprising:

a plurality of telecommunications switching means for dynamically connecting or disconnecting communication paths with respect to various ones of a plurality of ports, each of said telecommunications switching means including means for time switching information to or from said ports, each of said time switching means having a switching capacity corresponding to a maximum number of ports that may be physically associated therewith, and means for transmitting and receiving information in packetized form, and means connected in communicating relationship with said time switching means for interfacing with one or more public or private networks which represent said ports, said communicating relationship including a bus for carrying data to and from said ports; and

means for interconnecting said plurality of telecommunications switching means in communicating relationship and operable in conjunction with said transmitting and receiving means to transfer said packetized information among said telecommunications switching means such that information, including circuit switched data, which originates from any port of any of said telecommunications switching means is substantially continuously communicable to any other port of the same or different telecommunications switching means.

2. The system as in claim 1 wherein said interconnecting means comprises a medium for carrying said packetized information in the form of optical signals, said medium providing one or more channels each of which is operable to carry all or some of said packetized information.

3. The system as in claim 2 wherein said interconnecting means comprises first and second media for carrying said packetized information in the form of optical signals, said second media for increasing the switching capacity of said system and providing fault isolation with respect to said plurality of telecommunications switching means.

4. The system as in claim 2 wherein said interconnecting means comprises a plurality of media for carrying said packetized information in the form of optical signals, said plurality of media for increasing the switching capacity of said system.

5. The system as in claim 1 wherein one or more of said telecommunications switching means comprises a programmable switch which is controllable by a host device.

6. The system as in claim 5 wherein one or more of said programmable switches is operable as a server which is controlled by one or more host devices which are operable as clients.

7. The system as in claim 6 wherein said host devices and said programmable switches are connected in communicating relationship by a local area network.

8. The system as in claim 1 further comprising a host device connected in communicating relationship with one of said plurality of telecommunications switching means, said host device operable to control the telecommunications switching means to which it is connected, and operable to control other ones of said plurality of telecommunications switching means by information transferred by said interconnecting means.

9. The system as in claim 8 wherein said communicating relationship between said host device and said one of said telecommunications switching means is provided by an asynchronous communication link.

10. The system as in claim 1 further comprising a host device operable to control each of said telecommunications switching means and connected by an asynchronous communication link with each of said telecommunications switching means.

11. The system as in claim 1 wherein said plurality of telecommunications switching means operate synchronously with respect to said public or private networks, and said interconnecting means operates asynchronously with respect to said public or private networks.

12. The system as in claim 1 wherein said interconnecting means comprises a local area network.

13. The system as in claim 1 wherein said interconnecting means comprises a wireless communication network.

14. The system as in claim 1 wherein said interconnecting means comprises a portion of a public switched telephone network.

15. The system as in claim 1 wherein said interconnecting means operates in accordance with asynchronous transfer mode to transfer information between said plurality of telecommunications switching means.

16. The system as in claim 1 wherein said interconnecting means comprises a synchronous optical network.

17. The system as in claim 1 wherein said information transferred by said interconnecting means includes packet switched data.

18. The system as in claim 1 wherein said packetized information transferred by said interconnecting means is carried by one or more packets each of which includes control and address information and a payload portion for carrying data.

19. The system as in claim 18 wherein said one or more packets include packets of variable lengths to transfer information over said interconnecting means.

20. The system as in claim 18 wherein said circuit switched data transferred by said interconnecting means is arranged in a predetermined order within a packet, whereby said order represents address information for determining the ports to which said circuit switched data corresponds.

21. The system as in claim 1 wherein circuit switched data is subjected to three levels of switching, a first level of switching being performed by the time switching means which is physically associated with the one of said ports from which circuit switched data originates, a second level of switching being performed by said transmitting and receiving means in conjunction with said interconnecting means, and a third level of switching being performed by the time switching means which is physically associated with the one of said ports for which said data is destined.

22. The system as in claim 1 wherein one or more of said telecommunications switching means includes a plurality of said time switching means and one or more switch control means, said switch control means for dynamically enabling one and only one of said plurality of time switching means to transmit circuit switched data to said bus.

23. The system as in claim 1 wherein said system is non-blocking.

24. The system as in claim 1 further comprising one or more voice processing resources connected to said interconnecting means, whereby each of said voice processing resources has access to circuit switched data which originates from any port of said system.

25. An expandable telecommunications system comprising:

a plurality of telecommunications switching means for dynamically connecting or disconnecting communication paths with respect to various ones of a plurality of ports, each of said telecommunications switching means including means for time switching information to or from said ports, and means for transmitting and receiving information in packetized form, and means connected in communicating relationship with said time switching means for interfacing with one or more public or private networks which represent said ports, said communicating relationship including a bus for carrying data to and from said ports; and

means for interconnecting said plurality of telecommunications switching means in communicating relationship and operable in conjunction with said transmitting and receiving means to perform up to three levels of switching with respect to information originating from any of said ports, a first level of switching being performed by the time switching means which is physically associated with the one of said ports from which said information originates, a second level of switching being performed by said transmitting and receiving means in conjunction with said interconnecting means, and a third level of switching being performed by the time switching means which is physically associated with the one of said ports for which said information is destined.

26. The system as in claim 25 wherein each of said time switching means has a switching capacity corresponding to a maximum number of ports that may be physically associated therewith.

27. The system as in claim 25 wherein information, including circuit switched data, which originates from any port of any of said telecommunications switching means is substantially continuously communicable to any other port of the same or different telecommunications switching means.

28. The system as in claim 25 wherein said interconnecting means comprises a medium for carrying said packetized information in the form of optical signals, said medium providing one or more channels each of which is operable to carry all or some of said packetized information.

29. The system as in claim 28 wherein said interconnecting means comprises first and second media for carrying said packetized information in the form of optical signals, said second media for increasing the switching capacity of said system and providing fault isolation with respect to said plurality of telecommunications switching means.

30. The system as in claim 28 wherein said interconnecting means comprises a plurality of media for carrying said packetized information in the form of optical signals, said plurality of media for increasing the switching capacity of said system.

31. The system as in claim 25 wherein one or more of said telecommunications switching means comprises a programmable switch which is controllable by a host device.

32. The system as in claim 31 wherein one or more of said programmable switches is operable as a server which is controlled by one or more host devices which are operable as clients.

33. The system as in claim 32 wherein said host devices and said programmable switches are connected in communicating relationship by a local area network.

34. The system as in claim 25 further comprising a host device connected in communicating relationship with one of said plurality of telecommunications switching means, said host device operable to control the telecommunications switching means to which it is connected, and operable to control other ones of said plurality of telecommunications switching means by information transferred by said interconnecting means.

35. The system as in claim 34 wherein said communicating relationship between said host device and said one of said telecommunications switching means is provided by an asynchronous communication link.

36. The system as in claim 25 further comprising a host device operable to control each of said telecommunications switching means and connected by an asynchronous communication link with each of said telecommunications switching means.

37. The system as in claim 25 wherein said plurality of telecommunications switching means operate synchronously with respect to said public or private networks, and said interconnecting means operates asynchronously with respect to said public or private networks.

38. The system as in claim 25 wherein said interconnecting means comprises a local area network.

39. The system as in claim 25 wherein said interconnecting means comprises a wireless communication network.

40. The system as in claim 25 wherein said interconnecting means comprises a portion of a public switched telephone network.

41. The system as in claim 25 wherein said interconnecting means operates in accordance with asynchronous transfer mode to transfer information between said plurality of telecommunications switching means.

42. The system as in claim 25 wherein said interconnecting means comprises a synchronous optical network.

43. The system as in claim 25 wherein said information transferred by said interconnecting means includes packet switched data.

44. The system as in claim 25 wherein said packetized information transferred by said interconnecting means is carried by one or more packets each of which includes control and address information and a payload portion for carrying data.

45. The system as in claim 44 wherein said one or more packets include packets of variable lengths to transfer information over said interconnecting means.

46. The system as in claim 44 wherein said packetized information includes circuit switched data arranged in a predetermined order within said one or more packets, whereby said order represents address information for determining the ports to which said circuit switched data corresponds.

47. The system as in claim 25 wherein one or more of said telecommunications switching means includes a plurality of said time switching means and one or more switch control means, said switch control means for dynamically enabling one and only one of said plurality of time switching means to transmit circuit switched data to said bus.

48. The system as in claim 25 wherein said system is non-blocking.

49. The system as in claim 25 further comprising one or more voice processing resources connected to said interconnecting means, whereby each of said voice processing resources has access to circuit switched data which originates from any port of said system.

50. An expandable telecommunications system comprising:

(a) a plurality of nodes for performing telecommunications switching, each of said switching nodes including means for dynamically connecting or disconnecting communication paths with respect to various ones of a plurality of ports, means for time switching information to or from said ports, means for transmitting and receiving information in packetized form, and means connected in communicating relationship with said time switching means for interfacing with one or more public or private networks which represent said ports, said communicating relationship including a bus for carrying data to and from said ports;

(b) means for interconnecting said switching nodes in communicating relationship and operable in conjunction with said transmitting and receiving means to transfer said packetized information such that information, including circuit switched data, which originates from any port of any of said switching nodes is substantially continuously communicable to any node interfaced with said interconnecting means; and

(c) a plurality of nodes for providing telecommunications services, each of said services nodes interfaced with said interconnecting means and including means for transmitting and receiving information in packetized form, whereby any of said service nodes may dynamically provide telecommunications services with respect to any port of any of said switching nodes.

51. The system as in claim 50 wherein each of said time switching means has a switching capacity corresponding to a maximum number of ports that may be physically associated therewith.

52. The system as in claim 50 wherein said interconnecting means comprises a medium for carrying said packetized information in the form of optical signals, said medium providing one or more channels each of which is operable to carry all or some of said packetized information.

53. The system as in claim 52 wherein said interconnecting means comprises first and second media for carrying said packetized information in the form of optical signals, said second media for increasing the switching capacity of said system and providing fault isolation with respect to said plurality of telecommunications switching means.

54. The system as in claim 52 wherein said interconnecting means comprises a plurality of media for carrying said packetized information in the form of optical signals, said plurality of media for increasing the switching capacity of said system.

55. The system as in claim 50 wherein one or more of said switching nodes comprises a programmable switch which is controllable by a host device.

56. The system as in claim 55 wherein one or more of said programmable switches is operable as a server which is controlled by one or more host devices which are operable as clients.

57. The system as in claim 56 wherein said host devices and said programmable switches are connected in communicating relationship by a local area network.

58. The system as in claim 50 further comprising a host device connected in communicating relationship with one of said switching nodes, said host device operable to control the switching node to which it is connected, and operable to control other ones of said plurality of switching nodes by information transferred by said interconnecting means.

59. The system as in claim 58 wherein said communicating relationship between said host device and said one of said switching nodes is provided by an asynchronous communication link.

60. The system as in claim 50 further comprising a host device operable to control each of said switching nodes and connected by an asynchronous communication link with each of said switching nodes.

61. The system as in claim 50 wherein said plurality of switching nodes operate synchronously with respect to said public or private networks, and said interconnecting means operates asynchronously with respect to said public or private networks.

62. The system as in claim 50 wherein said interconnecting means comprises a local area network.

63. The system as in claim 50 wherein said interconnecting means comprises a wireless communication network.

64. The system as in claim 50 wherein said interconnecting means comprises a portion of a public switched telephone network.

65. The system as in claim 50 wherein said interconnecting means operates in accordance with asynchronous transfer mode to transfer information between said plurality of switching nodes.

66. The system as in claim 50 wherein said interconnecting means comprises a synchronous optical network.

67. The system as in claim 50 wherein said information transferred by said interconnecting means includes packet switched data.

68. The system as in claim 50 wherein said packetized information transferred by said interconnecting means is carried by one or more packets each of which includes control and address information and a payload portion for carrying data.

69. The system as in claim 68 wherein said one or more packets include packets of variable lengths to transfer information over said interconnecting means.

70. The system as in claim 68 wherein said packetized information includes circuit switched data arranged in a predetermined order within said one or more packets, whereby said order represents address information for determining the ports to which said circuit switched data corresponds.

71. The system as in claim 50 wherein one or more of said switching nodes includes multiple time switching means and one or more switch control means, said switch control means for dynamically enabling one and only one of said multiple time switching means to transmit circuit switched data to said bus.

72. The system as in claim 50 wherein said system is non-blocking.

73. The system as in claim 50 wherein one or more of said services nodes provides voice mail services.

74. The system as in claim 50 wherein one or more of said services nodes provides interactive voice response services.

75. The system as in claim 50 wherein one or more of said services nodes provides fax mail services.

76. The system as in claim 50 wherein one or more of said services nodes provides voice messaging services.

77. The system as in claim 50 wherein one or more of said services nodes provides wireless communications services.

78. The system as in claim 50 wherein one or more of said services nodes provides personal communications services.

79. The system as in claim 50 wherein one or more of said services nodes is part of a personal communications network.

80. A telecommunications switch which is operable as a node in a expandable telecommunications system, said switch comprising:

means for dynamically connecting or disconnecting communication paths with respect to various ones of a plurality of ports;

means for time switching information to or from said ports, said time switching means having a capacity which corresponds with a maximum number of ports which may be physically associated with said telecommunications switch;

means connected in communicating relationship with said time switching means for interfacing with one or more public or private networks which represent said ports, said communicating relationship including a bus for carrying data to and from said ports; and

means for transmitting and receiving packetized information over an inter-nodal network, said inter-nodal network for providing communications between said telecommunications switch and other nodes associated with said system, whereby information, including circuit switched data, which originates from any port of said telecommunications switch is substantially continuously communicable to any other port of said switch or any other node of said system.

81. The switch as in claim 80 wherein said switch is programmable and is controllable by a host device.

82. The switch as in claim 81 wherein said programmable switch is operable as a server which is controlled by one or more host devices which are operable as clients.

83. The switch as in claim 82 wherein said one or more host devices and said programmable switch are connected in communicating relationship by a local area network.

84. The switch as in claim 81 wherein said host device and said switch are connected by an asynchronous communication link.

85. The switch as in claim 80 wherein said inter-nodal network operates synchronously with respect to said public or private networks, and asynchronously with respect to said switch.

86. The switch as in claim 80 wherein said inter-nodal network comprises a local area network.

87. The switch as in claim 80 wherein said inter-nodal network comprises a wireless communication network.

88. The switch as in claim 80 wherein said inter-nodal network comprises a portion of a public switched telephone network.

89. The switch as in claim 80 wherein said inter-nodal network operates in accordance with asynchronous transfer mode.

90. The switch as in claim 80 wherein said inter-nodal network comprises a synchronous optical network.

91. The switch as in claim 80 wherein said information transferred by said inter-nodal network includes packet switched data.

92. The switch as in claim 80 wherein said packetized information transferred by said inter-nodal network is carried by one or more packets each of which includes control and address information and a payload portion for carrying data.

93. The system as in claim 92 wherein said one or more packets include packets of variable lengths to transfer information over said interconnecting means.

94. The switch as in claim 92 wherein said circuit switched data transferred by said interconnecting means is arranged in a predetermined order within a packet, whereby said order represents address information for determining the ports to which said circuit switched data corresponds.

95. The switch as in claim 80 wherein said telecommunications switch includes multiple time switching means and one or more switch control means, said switch control means for dynamically enabling one and only one of said multiple time switching means to transmit circuit switched data to said bus.

96. The switch as in claim 80 wherein said switch is non-blocking.

97. The switch as in claim 80 further comprising one or more voice processing resources connected to said inter-nodal network, whereby each of said voice processing resources has access to circuit switched data which originates from any port of said system.