Method and apparatus for controlling the operation of a flexible cross-connect system

• US 7,924,706 B1
• Filed: 03/06/2009
• Issued: 04/12/2011
• Est. Priority Date: 03/22/1999
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Roberson, Charles S.
• Primary Examiner(s): Moe; Aung S
• Assistant Examiner(s): Mered; Habte
• Application Number:
  US12/399,742
• Time in Patent Office: 767 Days
• Field of Search: 370216-250, 370/395.51, 370350-357, 370/359, 370360-363, 370366-376, 370/378, 370/381, 370386-388, 370/404, 370419-420, 370/434, 370/463, 370/465, 370/535, 379 9- 906, 379 1001- 1003, 379 14- 1401, 379 3201- 3203, 379/268, 379/269, 379/272, 379/306
• US Class Current: 370/218
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 49/101 using crossbar or matrix

Abstract

The present invention discloses a method and apparatus for cross-connecting high-speed telecommunications signals at a flexible cross-connect system. A method and apparatus for controlling communications between each of the cards located within the flexible cross-connect system is also disclosed. The method and apparatus also detect and report failures within the system, receive and validate software upgrades from external sources, maintain synchronization within the system, and monitor communication maps for the system.

Claims

1. A method comprising:

monitoring by an active control unit and a redundant control unit the operational status for each one of a plurality of elements and each one of a plurality of communications links within a flexible cross-connect system, the plurality of elements including;

the active control unit, the redundant control unit, a plurality of interface cards, an active cross-connect unit, a redundant cross-connect unit, and a plurality of point to point connections acting as the communications links between the plurality of elements;

determining when the operational status of any of the plurality of elements or the communications links between the plurality of elements indicates that the element or the communications link is non-operational;

autonomously switching from one active element to an associated redundant element in response to determining that the one active element is non-operational or from one active communications link between the plurality of elements to an associated redundant communications link between the plurality of elements in response to determining that the one active communications link is non-operational;

determining when the non-operational active element or the non-operational active communications link between the plurality of elements requires maintenance;

reporting that maintenance is required for the non-operational active element or the non-operational active communications link between the plurality of elements in response to determining that the non-operational active element or the non-operational active communications link between the plurality of elements requires maintenance; and

blocking communications from being sent to the non-operational active element or over the non-operational active communications link.

2. The method of claim 1, and further comprising flagging an element with a non-operational status if the element is receiving a software upgrade.

3. The method of claim 1, further comprising:

recording data related to each element in a database; and

updating the database to reflect changes to any of the elements, wherein the changes include maintenance performed on, replacement of, or user configuration changes.

4. The method of claim 1, further comprising:

detecting and reporting when any element or communications link between the plurality of elements has a change in operational status.

5. The method of claim 4, wherein said detecting and reporting includes:

tracking how long the change in operational status persists;

determining when the change in operational status has persisted for at least a predetermined amount of time; and

reporting the change in operational status when the predetermined amount of time is exceeded.

6. The method of claim 5, wherein said detecting and reporting further includes discarding the change in operational status when the change in operational status does not persist for the predetermined amount of time.

7. The method of claim 1, wherein the flexible cross-connect system is a first node within a network, and further comprising maintaining a connection map for the network.

8. The method of claim 1, further comprising:

maintaining a connection map associated with the flexible cross-connect system, the flexible cross-connect system being a node in a network, the connection map being arranged to indicate states of nodes within the network; and

updating the connection map to indicate a change in status of the flexible cross-connect system when it is determined that the operational status of any one of the plurality of elements or any one of the communications links between the plurality of cards indicates that the element is non-operational or the communications link between the plurality of elements is non-operational.

9. The method of claim 1, wherein autonomously switching from the non-operational active element to the associated redundant element includes switching from the active control unit to the redundant control unit.

10. The method of claim 1, wherein at a first interface card configured to be coupled to a wide area telecommunications network and a second interface card configured to be coupled to a separate data network, further comprising connecting the wide area telecommunications network with the data network via the flexible cross-connect system.

11. A computer readable non-transitory medium storing a computer program that, when executed by a processor, cause the processor to:

monitor the operational status for each one of a plurality of elements and each one of a plurality of communications links within a flexible cross-connect system, the plurality of elements including;

an active control unit, a redundant control unit, a plurality of interface cards, an active cross-connect unit, a redundant cross-connect unit, and a plurality of point to point connections acting as the communications links between the plurality of elements;

determine when the operational status of any of the plurality of elements or the communications links between the plurality of elements indicates that the element or the communications link is non-operational;

autonomously switch from one active element to an associated redundant element in response to determining that the one active element is non-operational or from one active communications link between the plurality of elements to an associated redundant communications link in response to determining that the one active communications link is non-operational;

determine when the non-operational active element or the non-operational active communications link between the plurality of elements requires maintenance;

report that maintenance is required for the non-operational active element or the non-operational active communications link between the plurality of elements in response to determining that the non-operational active element or the non-operational active communications link between the plurality of elements requires maintenance; and

block communications from being sent to the non-operational active element or over the non-operational active communications link.

12. The computer readable non-transitory medium of claim 11, wherein the computer program is configured to cause the processor to flag an element with a non-operational status if the element is receiving a software upgrade.

13. The computer readable non-transitory medium of claim 11, wherein the computer program is configured to cause the processor to:

record data related to each element in a database; and

update the database to reflect changes to any of the elements, wherein the changes include maintenance performed on, replacement of, or user configuration changes.

14. The computer readable non-transitory medium of claim 11, wherein the computer program is configured to cause the processor to:

detect and report when any element or communications link has a change in operational status.

15. The computer readable non-transitory medium of claim 14, wherein the computer program is configured to cause the processor to:

track how long the change in operational status persists;

determine when the change in operational status has persisted for at least a predetermined amount of time; and

report the change in operational status when the predetermined amount of time is exceeded.

16. The computer readable non-transitory medium of claim 15, wherein the computer program is configured to cause the processor to discard the change in operational status when the change in operational status does not persist for the predetermined amount of time.

17. The computer readable non-transitory medium of claim 11, wherein the computer program is configured to maintain a connection map for a network, wherein the flexible cross-connect unit is a first node within the network.

18. The method of claim 11, wherein autonomously switching from the non-operational active element to the associated redundant element includes switching from the active cross-connect unit to the redundant cross-connect unit.

19. An apparatus, comprising:

a plurality of cross-connect units comprising at least an active cross-connect unit and a redundant cross-connect unit;

a control unit configured to;

monitor the operational status for each one of the plurality of cross-connect units and a plurality of point to point connections acting as communications links between a plurality of elements within a flexible cross-connect system, the plurality of elements including;

the control unit, a redundant control unit, a plurality of interface cards, the active cross-connect unit, the redundant cross-connect unit, and the plurality of point to point connections acting as the communications links between the plurality of elements;

determine when the operational status of any of the plurality of elements or the communications links between the plurality of elements indicates that the element or the communications link between the plurality of elements is non-operational;

switch from one active element to an associated redundant element in response to determining that the one active element is non-operational or from one active communications link between the plurality of elements to an associated redundant communications link between the plurality of elements in response to determining that the one active communications link is non-operational; and

determine when the non-operational active element or the non-operational active communications link between the plurality of elements requires maintenance;

report that maintenance is required for the non-operational active element or the non-operational active communications link;

block communications from being sent to the non-operational active element or over the non-operational active communications link.