Programmable telecommunication switch for personal computer

• US 5,321,744 A
• Filed: 09/29/1992
• Issued: 06/14/1994
• Est. Priority Date: 09/29/1992
• Status: Expired due to Term

• Current Assignee: Excel Switching Corp. (Enghouse Systems Limited)
• Original Assignee: Excel Incorporated
• Inventors: Madonna, Robert P., Hebert, Mark P., Buttell, Robert J.
• Primary Examiner(s): Dwyer, James L.
• Assistant Examiner(s): Hunter, Daniel S.
• Application Number:
  US07/953,690
• Time in Patent Office: 623 Days
• Field of Search: 379/268, 379/269, 379/279, 379/88, 379/201
• US Class Current: 379/269
• CPC Class Codes: H04Q 11/0414 Details
• CPC Class Codes: H04Q 2213/1305 Software aspects
• CPC Class Codes: H04Q 2213/1308 Power supply
• CPC Class Codes: H04Q 2213/13093 Personal computer, PC
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13107 Control equipment for a part of the connection, distributed control, co-processing
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/13396 Signaling in general, in-band signalling
• CPC Class Codes: H04Q 3/625 Arrangements in the private branch exchange

Abstract

A user-programmable telephone switch which resides within a commercially available personal computer. The switch is controllable by either the personal computer'"'"'s microprocessor or a separate, external host connected to an interface provided within the switch. The switch includes a CPU/matrix card that contains a time slot interchange and a CPU running under a real time operating system. The CPU/matrix card controls the overall operation of the switch in accordance with messages received from the operative host. In general, those tasks or functions which must be performed in real time are the responsibility of the switch, as opposed to the internal or external host. Within the switch, certain tasks or functions may be delegated by the CPU/matrix card to intelligent line cards which contain their own microprocessors having substantial call processing capability.

Claims

1. A programmable communications switch comprising:

controllable-switching means for dynamically connecting or disconnecting communication paths between various ones of a plurality of ports in response to predetermined messages, including means for processing said messages, a time slot interchange and a real time operating system;

a first host computer in which said switching means resides, said first host computer for providing electrical power to said switching means, having a first application-oriented operating system and being programmable to generate said messages;

means for connecting one or more line cards in communicating relationship with said switching means, each of said one or more line cards for terminating either analog lines or trunks or digital lines or trunks, each of said digital line cards including processing means for performing one or more predetermined call processing tasks;

said message processing means being operable to distinguish between said analog and digital line cards, whereby said message processing means may assign responsibility to said digital line card processing means for performing said one or more predetermined call processing tasks, while retaining responsibility for performing such tasks with respect to said analog line cards.

2. The switch as in claim 1 wherein said messages are generated by said host in accordance with a predetermined format which is independent of the types of line cards connected to said switching means.

3. The switch as in claim 1 further comprising means for interfacing said switching means with a second host computer having a second application-oriented operating system and being programmable to generate said messages and means, coupled to the message processing means, for selecting one of said first and second host computers to control said controllable-switching means.

4. The switch as in claim 1 wherein said first host computer comprises a personal computer motherboard which includes an input/output bus and a power bus, and said switching means is connected to both of said busses.

5. The switch as in claim 4 further comprising one or more line cards, connected in communicating relationship with said switching means, for terminating either digital or analog lines or trunks.

6. The switch as in claim 5 wherein each of said one or more line cards for terminating digital lines or trunks includes means for processing messages generated by said switching means.

7. The switch as in claim 1 further comprising means, responsive to the message processing means, for selecting one of a plurality of synchronization signals available thereto.

8. The switch as in claim 1 wherein said second host computer is connected with said interfacing means and exclusively controlling said switching means without said first host computer.

9. The switch as in claim 1 wherein said analog line cards are connected in communicating relationship with said switching means by a bus for carrying time division multiplex data, a timing/control bus and a line card status/control bus.

10. The switch as in claim 1 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by identifying one or more types of signalling protocol modules located on said analog line card.

11. The switch as in claim 1 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by indicating the number of signalling protocol modules located on said analog line card.

12. The switch as in claim 1 wherein said digital line cards are connected in communicating relationship with said switching means by a bus for carrying messages bidirectionally, a bus for carrying time division multiplex data, and a timing/control bus.

13. The switch as in claim 1 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the status of the digital line card.

14. The switch as in claim 1 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the types of ports provided by the digital line card.

15. The switch as in claim 1 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates how many ports are provided on the digital line card.

16. The switch as in claim 1 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates whether a download of instructions is needed by the digital line card.

17. The switch as in claim 16 wherein the message processing means of the switching means, in response to receiving a message from a digital line card indicating that a download of instruction is needed, downloads instructions to said digital line card.

18. The switch as in claim 17 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for signalling supervision.

19. The switch as in claim 17 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for call inpulsing and outpulsing.

20. The switch as in claim 17 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for detection of incoming calls.

21. The switch as in claim 17 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for generation of outgoing calls.

22. A programmable communications switch comprising:

controllable-switching means for dynamically connecting or disconnecting communication paths between various ones of a plurality of ports in response to predetermined messages, including means for processing said messages, a time slot interchange and a real time operating system;

a first host computer in which said switch means resides comprising a personal computer motherboard that includes an input/output bus and a power bus, said switching means being connected to both of said busses, said first host computer having a first application-oriented operating system and being programmable to generate said messages;

means for interfacing said switching means with a second host computer having a second application-oriented operating system and being programmable to generate said messages;

means, coupled to the message processing means, for selecting one of said first and second host computers to control said controllable-switching means; and

one or more line cards connected in communicating relationship with said switching means, each of said one or more line cards for terminating either analog lines or trunks or digital lines or trunks, each of said digital line cards including means for processing messages generated by said switching means and performing one or more predetermined call processing tasks,

said message processing means of said switching means being operable to distinguish between said one or more line cards and to assign responsibility to said digital line cards for performing one or more predetermined call processing tasks, while retaining responsibility for performing said tasks with respect to said analog line cards.

23. The switch as in claim 22 further comprising means, responsive to the message processing means, for selecting one of a plurality of synchronization signals available thereto.

24. The switch as in claim 22 wherein said messages are generated by said host computers in accordance with a predetermined format which is independent of the types of line cards connected to said switching means.

25. The switch as in claim 22 wherein said analog line cards are connected in communicating relationship with said switching means by a bus for carrying time division multiplex data, a timing/control bus and a line card status/control bus.

26. The switch as in claim 22 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by identifying one or more types of signalling protocol modules located on said analog line card.

27. The switch as in claim 22 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by indicating the number of signalling protocol modules located on said analog line card.

28. The switch as in claim 22 wherein said digital line cards are connected in communicating relationship with said switching means by a bus for carrying messages bidirectionally, a bus for carrying time division multiplex data, and a timing/control bus.

29. The switch as in claim 22 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the status of the digital line card.

30. The switch as in claim 22 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the types of ports provided by the digital line card.

31. The switch as in claim 22 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates how many ports are provided on the digital line card.

32. The switch as in claim 22 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates whether a download of instructions is needed by the digital line card.

33. The switch as in claim 32 wherein the message processing means of the switching means, in response to receiving a message from a digital line card indicating that a download of instructions is needed, downloads instructions to said digital line card.

34. The switch as in claim 33 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for signalling supervision.

35. The switch as in claim 33 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for call inpulsing and outpulsing.

36. The switch as in claim 33 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for detection of incoming calls.

37. The switch as in claim 33 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for generation of outgoing calls.

38. A programmable communications switch comprising:

controllable-switching means for dynamically connecting or disconnecting communication paths between various ones of a plurality of ports in response to predetermined messages, including a time slot interchange, a real time operating system and means for processing said messages and for transmitting messages to and receiving messages from one or more line cards;

a first host computer in which said switching means resides, said first host computer for providing electrical power to said switching means, having a first application-oriented operating system and being programmable to generate said messages;

means for connecting said one or more line cards in communicating relationship with said switching means, each of said one or more line cards for terminating either analog lines or trunks or digital lines or trunks, each of said digital line cards including processing means for performing one or more predetermined call processing tasks and for transmitting messages to and receiving messages from said switching means;

said message processing means of said switching means being operable to distinguish between said analog and digital line cards, whereby said message processing means of said switching means may assign responsibility to said digital line card processing means for performing said one or more predetermined call processing tasks, while retaining responsibility for performing such tasks with respect to said analog line cards.

39. The switch as in claim 38 wherein said messages are generated by said host in accordance with a predetermined format which is independent of the types of line cards connected to said switching means.

40. The switch as in claim 38 further comprising means for interfacing said switching means with a second host computer having a second application-oriented operating system and being programmable to generated said messages and means, coupled to the message processing means, for selecting one of said first and second host computers to control said controllable-switching means.

41. The switch as in claim 38 wherein said first host computer comprises a personal computer motherboard which includes an input/out bus and a power bus, and said switching means is connected to both of said busses.

42. The switch as in claim 38 wherein said analog line cards are connected in communicating relationship with said switching means by a bus for carrying time division multiplex data, a timing/control bus and a line card status/control bus.

43. The switch as in claim 38 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by identifying one or more types of signalling protocol modules located on said analog line card.

44. The switch as in claim 38 wherein each of said analog line cards includes means for responding to an interrogation by said message processing means of said switching means by indicating the number of signalling protocol modules located on said analog line card.

45. The switch as in claim 38 wherein said digital line cards are connected in communicating relationship with said switching means by a bus for carrying messages bidirectionally, a bus for carrying time division multiplex data, and a timing/control bus.

46. The switch as in claim 38 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the status of the digital line card.

47. The switch as in claim 38 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates the types of ports provided by the digital line card.

48. The switch as in claim 38 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates how many ports are provided on the digital line card.

49. The switch as in claim 38 wherein the message processing means of each of said digital line cards transmits one or more messages to the message processing means of the switching means which indicates whether a download of instructions is needed by the digital line card.

50. The switch as in claim 49 wherein the message processing means of the switching means, in response to receiving a message from a digital line card indicating that a download of instructions is needed, downloads instructions to said digital line card.

51. The switch as in claim 50 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for signalling supervision.

52. The switch as in claim 50 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for call inpulsing and outpulsing.

53. The switch as in claim 50 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for detection of incoming calls.

54. The switch as in claim 50 wherein the message processing means of the switching means downloads instructions to said digital line card which include instructions for generation of outgoing calls.