Communication circuit switching or parallel operation system

• US 5,031,211 A
• Filed: 02/01/1990
• Issued: 07/09/1991
• Est. Priority Date: 02/03/1989
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nagai, Yasuhiro, Yosioka, Shunichi, Suzuki, Michio, Sasaki, Ryoichi, Mizuhara, Noboru
• Primary Examiner(s): Dwyer, James L.
• Application Number:
  US07/473,607
• Time in Patent Office: 523 Days
• Field of Search: 379/220, 379/221, 379/225, 379/32, 379/219, 379/207
• US Class Current: 379/221.04
• CPC Class Codes: H04Q 3/0016 Arrangements providing connection between exchanges
• CPC Class Codes: H04Q 3/665 Circuit arrangements therefor

Abstract

The communication system has a plurality of sub-networks, for example composed of transmission communication nodes, PBX communication notes, application communication nodes, and the like, respectively. Each of these sub-networks is managed by a management system, and all of the management systems are managed by an integrated management system. Each communication node is autonomously provided with the function of establishing an emergency routing as a first stage routing control on the occurrence of a failure in a circuit affecting the communication node. The autonomous routing is heirarchial with respect to node types. Failure and the influences of failure are reported to the sub-network management systems, which in turn can report to the integrated management system. As a second stage of routing control, one or more of the management systems establishes a global routing to replace the emergency local routing. The global routing may take effect if the managment system determines that the failure cannot be corrected within a substantially fixed period of time.

Claims

1. A communication system, comprising:

a communication network including a plurality of communication nodes;

management system means for managing said communication network;

said communication nodes including routing means for autonomously executing emergency local routing at the time of occurrence of a failure as a first stage of routing control; and

said management system means determining an optimal network global routing relative to said communication network as a whole after the emergency local routing, as a second stage of routing control, to replace the emergency local routing.

2. The communication system of claim 1, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

3. The communication system of claim 1, wherein there are a plurality of said communication networks operatively interconnected as communication sub-networks of the system;

and

wherein said management system means includes a plurality of sub-network management system means respectively for each of said communication sub-networks.

4. The communication system of claim 3, wherein said management system means includes an integrated network management system means for managing said communication sub-network management system means, and said integrated network management system means having said function of determining the optimal network global routing.

5. The communication system of claim 3, wherein each of said communication sub-network management system means has said function of determining the optimal network global routing for its network.

6. The communication system of claim 3, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

7. The communication system of claim 4, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

8. The communication system of claim 5, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

9. The communication system of claim 4, wherein each of said sub-network management system means receives control information from the communication nodes within its sub-network and reports both failures and the influence of failures upon its sub-network to said integrated network management system means.

10. The communication system of claim 9, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

11. The communication system of claim 4, wherein said determining means determines the optimal network global routing on the basis of information from all of said sub-networks.

12. The communication system of claim 11, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

13. The communication system of claim 9, wherein said integrated network management system means determines the optimal network global routing on the basis of information from all of said sub-network management systems.

14. The communication system of claim 13, wherein said management system means, in response to information received from said communication nodes, determines an expected time for correcting the failure, and issues a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

15. The communication system of claim 3, wherein said communication nodes are of different equipment types, and all of the communication nodes of one equipment type are managed by a sub-network management system means specific to that type.

16. The communication system of claim 15, wherein the types of communication nodes and sub-networks include transmission, PBX, and application.

17. The communication system of claim 15, including means controlling execution of said autonomous emergency local routing for all communication nodes of each type with a hierarchy of execution that differs between types.

18. The communication system of claim 15, wherein the types of communication nodes and sub-networks are transmission, PBX and application;

and

including means controlling execution of said autonomous emergency local routing for all communication nodes of each type with a hierarchy of execution that differs between types, for executing the emergency local routing at a substantially fixed time after detection of failure so that the fixed times differ between communication node types sufficiently to effectively completely execute local routing by one communication node type in time that the other communication node types will not execute emergency local routing, in the order of hierarchy.

19. The communication system of claim 18, wherein said fixed time for the transmission equipment type of equipment is shorter to provide a more preferential hierarchy than the fixed time and hierarchy of the PBX type of equipment.

20. The communication system of claim 18, wherein said communication nodes include packed exchange type of equipment;

and said fixed time for the transmission equipment type of equipment is shorter to provide a more preferential hierarchy than the fixed time and hierarchy of the packet exchange type of equipment.

21. The communication system of claim 18, wherein said communication nodes include communication control processors, CCP'"'"'s and said fixed time for the transmission equipment type of equipment is shorter to provide a more preferential hierarchy than the fixed time and hierarchy of the communication control processor CCP type of equipment.

22. The communication system of claim 1, wherein said management system means includes a transmission sub-network management system means for managing a transmission sub-network of a plurality of communication nodes that are transmission equipment;

said management system means further including PBX sub-network management system means for managing an exchange sub-network of PBX type communication nodes;

said management system means further including application sub-network management system means for managing an application sub-network composed of application communication nodes being a plurality of at least one of terminals and host computers; and

said management system means further including integrated network management system means for collecting information on causes of failure from said sub-network management system means and information on influence of failures from said sub-network management system means.

23. The communication system of claim 22, wherein each of said communication nodes includes means for autonomously reporting failures to its respective sub-network management system means;

and

each of said sub-network management system means including means for reporting failures reported from its communication nodes to said integrated network management system means and reporting information as to the influence of failures within its sub-network to said integrated network management system means.

24. The communication system of claim 22, wherein said integrated network management system means includes means for querying said sub-network management system means, upon receipt of a report of failure, as to the influences of failures upon the respective sub-networks.

25. The communication system of claim 22, wherein each of said sub-network management system means has said means determining an optimal network global routing with respect to its sub-network autonomously in response to receipt of a failure report from its communication nodes.

26. The communication system of claim 23, wherein said integrated network management system means includes said means determining an optimal network global routing with respect to all of said sub-networks in response to said report of failure and said information on influences of failures from said sub-network management system means.

27. The communication system of claim 1, wherein said means determining optimal network global routing includes means storing an operation route table that determines different optimal global routing for corresponding different failures.

28. The communication system of claim 22, wherein said means for determining an optimal network global routing includes means storing an operation route table that determines different optimal global routing for corresponding different failures and failure influences.

29. The communication system of claim 28, wherein said means for determining periodically updates said table by dynamically changing said optimal routing within said table according to changing conditions within the network system.

30. The communication system of claim 27, wherein said means for determining periodically updates said table by dynamically changing said optimal routing within said table according to changing conditions within the network system.

31. The communication system of claim 30, wherein said means for determining distributes said routing table periodically to said sub-network management system means to be used by said sub-network management system means in determining the optimal global routing as the second stage.

32. The communication system of claim 23, wherein said integrated network management system means includes means for querying said sub-network management system means, upon receipt of a report of failure, as to the influences of failures upon the respective sub-networks.

33. The communication system of claim 32, wherein each of said sub-network management system means has said means determining an optimal network global routing with respect to its sub-network autonomously in response to receipt of a failure report from its communication nodes.

34. The communication system of claim 33, wherein said integrated network management system means includes said means determining an optimal network global routing with respect to all of said sub-networks in response to said report of failure and said information on influences of failures from said sub-network management system means.

35. The communication system of claim 34, wherein said means determining optimal network global routing includes means storing an operation route table that determines different optimal global routing for corresponding different failures.

36. The communication system of claim 35, wherein said means for determining distributes said routing table periodically to said sub-network management system means to be used by said sub-network management system means in determining the optimal global routing as the second stage.

37. The communication system of claim 32 wherein said integrated network management system means includes said means determining an optimal network global routing with respect to all of said sub-networks in response to said report of failure and said information on influences of failures from said sub-network management system means.

38. The communication system of claim 37, wherein said means determining optimal network global routing includes means storing an operation route table that determines different optimal global routing for corresponding different failures.

39. The communication system of claim 38, wherein said means for determining distributes said routing table periodically to said sub-network management system means to be used by said sub-network management system means in determining the optimal global routing as the second stage.

40. The communication system of claim 32, wherein said means determining optimal network global routing includes means storing an operation route table that determines different optimal global routing for corresponding different failures.

41. The communication system of claim 23, wherein said integrated network management system means includes means for querying said sub-network management system means, upon receipt of a report of failure, as to the influences of failures upon the respective sub-networks.

42. The communication system of claim 23, wherein each of said sub-network management system means determines an optimal network global routing with respect to its sub-network autonomously in response to receipt of a failure report from its communication nodes.

43. A communication method for a communication network including a plurality of communication nodes, comprising:

autonomously executing emergency local routing at the time of occurrence of a failure as a first stage of routing control; and

determining an optimal network global routing relative to the communication network as a whole after the emergency local routing, as a second stage of routing control, to replace the emergency local routing.

44. The communication method of claim 43, wherein in response to information received from the communication nodes, determining an expected time for correcting the failure, and issuing a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

45. The communication method of claim 43, including connecting a plurality of communication networks operatively as communication sub-networks of the system;

and

separately managing each of the sub-networks.

46. The communication method of claim 45, including an integrated managing of said steps of managing each of the sub-networks with said step of determining the optimal network global routing.

47. The communication system of claim 45, wherein said step of determining the optimal network global routing is conducted by each of said steps of managing each of the sub-networks.

48. The communication method of claim 45, wherein in response to information received from the communication nodes, determining an expected time for correcting the failure, and issuing a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

49. The communication method of claim 46, wherein in response to information received from the communication nodes, determining an expected time for correcting the failure, and issuing a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.

50. The communication method of claim 47, wherein in response to information received from the communication nodes, determining an expected time for correcting the failure, and issuing a command to the communication network to replace the emergency local routing with the optimal network global routing when the expected time exceeds a reference value.