Mesh with projection channel access (MPCA)

• US 7,170,852 B1
• Filed: 09/29/2000
• Issued: 01/30/2007
• Est. Priority Date: 09/29/2000
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Adler, John C.
• Primary Examiner(s): To; Doris H.
• Assistant Examiner(s): Elallam; Ahmed
• Application Number:
  US09/676,743
• Time in Patent Office: 2,314 Days
• Field of Search: 370216-228, 370/351, 370/389, 370/395.1, 370/399.51, 370/395.52, 370/907
• US Class Current: 370/223
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085
• CPC Class Codes: Y10S 370/907 Synchronous optical network, SONET

Abstract

A method for a communications network with a protect channel transmitting protect channel data and working channel transmitting working channel data includes transmitting the working channel data via the protect channel upon a disruption in the working channel, and restoring the transmitting of protect channel data, wherein the restoring includes applying a mesh restoration protocol to the communications network to restore the transmittal of the protect channel data. The restoring includes finding one or more alternate channels to transmit the protect channel data, the one or more alternate channels including connected working and protect channels. An apparatus disposed in a communication network having a protect channel and a working channel includes a node controller, a route processor coupled to the node controller, the route processor implementing a mesh restoration protocol, and a circuit coupled to the node controller and the route processor, the circuit including a logic gate for receiving signals identifying disruptions in transmissions in the protect channel and the working channel and a switch responsive to the signals identifying disruptions in transmissions in the protect channel and the working channel, the switch communicating with the route processor to implement mesh restoration of protect channel data. In one embodiment, the circuit is coupled to at least one line card, the line card transmitting the signals identifying disruptions in transmissions in the protect channel and the working channel. The circuit further includes an input/output circuit for receiving instructions identifying criteria for applying mesh restoration to protect channel data.

Claims

1. A method comprising:

transmitting working channel data via a protect channel upon a disruption in a working channel, wherein prior to the disruption in the working channel, the working channel data had been transmitted over the working channel and protect channel data had been transmitted over the protect channel; and

restoring transmission of the protect channel data on an alternate channel other than the protect channel by applying a mesh restoration protocol, wherein

the alternate channel transmits the protect channel data from a first node to a second node via a mesh node, and

wherein a first network comprises the first and second nodes,

the mesh node is in a network other than the first network, and

the network other than the first network is a second network.

2. The method of claim 1 wherein the mesh restoration protocol is a distributed mesh restoration protocol.

3. The method of claim 1 wherein the protect channel data includes at least one of video, voice and data.

4. The method of claim 1 wherein the alternate channel includes connected working and protect channels.

5. The method of claim 1 wherein the first network is one of a Synchronous Optical Network (SONET) and a Synchronous Digital Hierarchy (SDH).

6. The method of claim 1 wherein the second network includes a plurality of interconnected nodes, the interconnected nodes having at least one of a working channel and a protect channel.

7. The method of claim 6 wherein the plurality of interconnected nodes transmits a disruption signal upon receiving a signal indicating the disruption, the disruption signal flooding the second network to determine alternate routes for the protect channel data.

8. The method of claim 1 wherein the mesh restoration protocol includes communicating status and control messages across a physical network layer of the second network.

9. The method of claim 8, wherein the status and control messages are communicated using SONET frame overhead bytes.

10. The method of claim 1 wherein the mesh restoration protocol includes communicating status and control messages across out-of-band communication channels.

11. The method of claim 8, wherein the status and control messages are communicated via distributed intelligence using a distributed routing protocol.

12. An apparatus comprising:

a node controller;

a route processor coupled to the node controller, the route processor implementing a mesh restoration protocol;

a circuit coupled to the node controller and the route processor, the circuit including;

a logic gate for receiving signals identifying disruptions in transmissions in a protect channel and a working channel;

a switch responsive to the signals identifying disruptions in transmissions in the protect channel and the working channel, the switch communicating with the route processor to implement mesh restoration of protect channel data, wherein

the mesh restoration of protect channel data restores the protect channel data on a channel other than the protect channel by transmitting the protect channel data from a first node to a second node via a mesh node, and

wherein a first network comprises the first and second nodes,

the mesh node is in a network other than the first network, and

the network other than the first network is a second network.

13. The apparatus of claim 12 wherein the circuit is coupled to at least one line card, the line card transmitting the signals identifying disruptions in transmissions in the protect channel and the working channel.

14. The apparatus of claim 12 wherein the circuit includes an input/output circuit for receiving instructions identifying criteria for applying mesh restoration to protect channel data.

15. The apparatus of claim 14 wherein the criteria are a function of the type of data being transmitted as the protect channel data.

16. The apparatus of claim 12 wherein the protect channel data includes at least one of voice, video and data.

17. The apparatus of claim 12 wherein the first network is one of a Synchronous Optical Network (SONET) and a Synchronous Digital Hierarchy (SDH).

18. The apparatus of claim 12 wherein the-second network includes a plurality of interconnected nodes, the interconnected nodes having at least one of a working channel and a protect channel.

19. The apparatus of claim 12 wherein the route processor communicates with a plurality of interconnected nodes and transmits a disruption signal upon receiving a signal indicating the disruption, the disruption signal flooding the second network to determine alternate routes for the protect channel data.

20. The apparatus of claim 19 wherein the route processor implements a mesh restoration protocol that includes communicating status and control messages across SONET overhead bytes of the communication network.

21. An apparatus comprising:

means for receiving signals identifying a disruption in a working channel, the disruption causing the working channel data to be transmitted via a protect channel upon a disruption in the working channel; and

means for restoring the transmitting of protect channel data coupled to the means for transmitting the working channel data, wherein

the means for restoring includes means for applying a mesh restoration protocol to restore the transmittal of the protect channel data on a channel other than the protect channel by transmitting the protect channel data from a first node to a second node via a mesh node, and

wherein a first network comprises the first and second nodes,

the mesh node is in a network other than the first network, and

the network other than the first network is a second network.

22. The apparatus of claim 21 wherein the protect channel data includes at least one of video, voice and internet protocol (IP) data.

23. The apparatus of claim 21 wherein the means for restoring further includes means for finding one or more alternate channels to transmit the protect channel data, the one or more alternate channels including connected working and protect channels.

24. The apparatus of claim 21 wherein the first-network is one of a Synchronous Optical Network (SONET) and a Synchronous Digital Hierarchy (SDH).

25. The apparatus of claim 21 wherein the-second network includes a plurality of interconnected nodes, the interconnected nodes having at least one of a working channel and a protect channel.

26. The apparatus of claim 25 wherein the plurality of interconnected nodes transmits a disruption signal upon receiving a signal indicating the disruption, the disruption signal flooding the second network to determine alternate routes for the protect channel data.

27. The apparatus of claim 21 wherein the apparatus is coupled to a node controller coupled to a line card, the line card being one of a plurality of line cards disposed in a management bay holding one or more line cards configured to transmit a plurality of signals.

28. The apparatus of claim 21 wherein the apparatus includes a plurality of circuits disposed in a plurality of linked nodes, each circuit coupled to a node controller associated with one of the plurality of linked nodes.

29. A computer program product encoded in a computer readable medium with executable program for a communications network including a protect channel transmitting protect channel data and working channel transmitting working channel data, the computer program product comprising:

transmit the working channel data via the protect channel upon a disruption in the working channel; and

restore the transmitting of the protect channel data, wherein

the restoring includes applying a distributed mesh restoration protocol to the communications network to restore the transmittal of the protect channel data on a channel other than the protect channel by transmitting the protect channel data from a first node to a second node via a mesh node,

a first network comprises the first and second nodes,

the mesh node is in a network other than the first network, and

the network other than the first network is a second network.