Optical network connection termination on client facility failure

Patent metadata

Field	Value
Publication number	US-9608719-B2
Application number	US-201414568826-A
Country	US
Kind code	B2
Filing date	Dec 12, 2014
Priority date	Dec 12, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A method for operating an optical network (ON) using a control plane (CP), including: identifying, by the CP, a failure of a client facility connecting a network element of the ON and a client device; and terminating, by the CP and in response to identifying the failure, an optical connection through the ON for the client device.

First claim

What is claimed is:

1. A method for operating an optical network (ON) using a control plane (CP), comprising:
identifying, by the CP, a failure of a client facility connecting a first network element of the ON and a client device by determining that the first network element has received an error detected (ED) signal from the client device, wherein the client facility is external to the ON;
terminating, by the CP and in response to identifying the failure, an optical connection through the ON for the client device between the first network element and a second network element of the ON, wherein the first network element sends a failed optical connection (FOC) signal to the client device in response to terminating the optical connection;
executing, by the CP, a first reestablishment of the optical connection through the ON for the client device after a first sleep interval, wherein the FOC signal is cleared in response to executing the first reestablishment of the optical connection;
terminating, by the CP, the reestablished optical connection in response to the ED signal not clearing after the FOC signal is cleared indicating that the failure is still present; and
executing, by the CP, a second reestablishment of the optical connection through the ON for the client device after the failure of the client facility is resolved.

2. The method of claim 1 , further comprising:
sending the FOC signal to the client device in response to terminating the reestablished optical connection;
clearing the FOC signal in response to executing the second reestablishment of the optical connection,
wherein the failure is resolved before the FOC signal is cleared, and
wherein the ED signal is cleared in response to clearing the FOC signal and the failure being resolved.

3. The method of claim 1 , further comprising:
sending the FOC signal to the client device in response to terminating the reestablished optical connection; and
replacing, by the first network element, the FOC signal with a valid data signal after a second sleep interval,
wherein the ED signal is cleared in response to replacing the FOC signal with the valid data signal.

4. The method of claim 1 , further comprising:
receiving, during a setup of the optical connection, a request to invoke a connection release attribute,
wherein terminating the optical connection is further based on the connection release attribute;
identifying, within a release signaling message associated with the optical connection, a reason for terminating the optical connection; and
initiating the first sleep interval in response to the reason for terminating the optical connection being the failure of the client facility.

5. The method of claim 1 , wherein the client device utilizes at last one signal type selected from a group consisting of Ethernet, digital video, OTN, and SONET/SDH.

6. A non-transitory computer readable medium (CRM) storing instructions for operating an optical network (ON) using a control plane (CP), the instructions comprising functionality for:
identifying, by the CP, a failure of a client facility connecting a first network element of the ON and a client device by determining that the first network element has received an error detected (ED) signal from the client device, wherein the client facility is external to the ON;
terminating, by the CP and in response to identifying the failure, an optical connection through the ON for the client device between the first network element and a second network element of the ON,
wherein the network element sends a failed optical connection (FOC) signal to the client device in response to terminating the optical connection,
wherein the network element replaces, after a first sleep interval, the FOC signal with a valid data signal, and
wherein the ED signal is cleared in response to replacing the FOC signal with the valid data signal; and

executing, by the CP, a first reestablishment of the optical connection in response to the ED signal being cleared.

7. The non-transitory CRM of claim 6 , the instructions further comprising functionality for:
executing a second reestablishment of the optical connection for the client device after a second sleep interval;
clearing the FOC signal in response to executing the second reestablishment of the optical connection after the second sleep interval;
terminating the reestablished optical connection in response to the ED signal not clearing after the FOC signal is cleared indicating that the failure is still present; and
sending the FOC signal from the first network element to the client device in response to terminating the reestablished optical connection.

8. The non-transitory CRM of claim 6 , the instructions further comprising functionality for:
receiving, during a setup of the optical connection, a request to invoke a connection release attribute,
wherein terminating the optical connection is further based on the connection release attribute;
identifying, within a release signaling message associated with the optical connection, a reason for terminating the optical connection; and
initiating the first sleep interval in response to the reason for terminating the optical connection being the failure of the client facility.

9. The non-transitory CRM of claim 6 , wherein the client device utilizes at last one signal type selected from a group consisting of Ethernet, digital video, OTN, and SONET/SDH.

10. A system, comprising:
a first network element belonging to an optical network (ON) and configured to:
receive an error detected (ED) signal from a client device connected to the first network element by a client facility, wherein the client facility is external to the ON,
send a failed optical connection (FOC) signal to the client device in response to termination of an optical connection through the ON between the first network element and a second network element, and
clear the FOC signal in response to a first reestablishment of the optical connection; and

a control plane (CP) of the ON, associated with the first network element, and configured to:
identify a failure of the client facility between the first network element and the client device based on the ED signal,
terminate, in response to the failure, the optical connection through the ON for the client device between the first network element and the second network element of the ON,
execute the first reestablishment of the optical connection after a sleep interval,
terminate the reestablished optical connection in response to the ED signal not clearing after the FOC signal is cleared indicating that the failure is still present, and
execute a second reestablishment of the optical connection for the client device after the failure is resolved.

11. The system of claim 10 , wherein the client device utilizes at last one signal type selected from a group consisting of Ethernet, digital video, OTN, and SONET/SDH.

12. The system of claim 10 , wherein the first network element is further configured to:
clear the FOC signal in response to the second reestablishment of the optical connection, wherein the ED signal is cleared in response to clearing the FOC signal and the failure being resolved.

13. A method for operating an optical network (ON) using a control plane (CP), comprising:
identifying, by the CP, a failure of a client facility connecting a first network element of the ON and a client device, wherein the client facility is external to the ON;
terminating, by the CP and in response to identifying the failure, an optical connection through the ON for the client device between the first network element and a second networ

Assignees

• Skalecki Darek
• Swinkels Gary
• Surek Steven Arvo
• Ciena Corp

Inventors

• Skalecki Darek
• Swinkels Gary
• Surek Steven Arvo

Classifications

• H04B10/07

  Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems · CPC title

• H04B10/0771

  Fault location on the transmission path · CPC title

• H04B10/03 Primary

  Arrangements for fault recovery · CPC title

• H04B10/0791

  Fault location on the transmission path · CPC title

• H04Q11/0062

  Network aspects · CPC title