Optical layer status exchange over OSC-OAM method for ROADM networks

Patent metadata

Field	Value
Publication number	US-9485015-B2
Application number	US-201213452413-A
Country	US
Kind code	B2
Filing date	Apr 20, 2012
Priority date	Nov 14, 2011
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A method for receiving, by circuitry of an optical node adapted for wavelength multiplexing and wavelength switching, a signal over OSC comprising overhead information indicative of status of at least one of an optical layer in an OTN; wherein the signal utilizes OC-N frame format comprising a first STS frame, a second STS frame, and a third STS frame, the STS frames having a format wherein the information is assigned to a number of bits designated for OAM information, wherein the bits are assigned to bytes within a transport overhead portion of the STS frame format within the OC-N frame format; terminating, by circuitry of the optical node, the signal at the optical node; and notifying, by circuitry of the optical node, software of the status of the optical layer in the OTN.

First claim

What is claimed is:

1. A method comprising the steps of:
receiving, by circuitry of an optical node adapted for wavelength multiplexing and wavelength switching, a signal over an optical control channel, the signal conforms to an optical carrier (OC-N) frame format, and the signal includes a transport overhead portion of a synchronous transport signal frame format, the transport overhead portion including D 4 -D 12 bytes, a first one of the D 4 -D 12 bytes including first bits of a Backward Defect Indication Payload field, second bits of a Backward Defect Indication Overhead field, and third bits of a Payload Missing Indicator field, the first bits, the second bits, and the third bits being indicative of a status of an optical layer in an optical transport network, a second one of the D 4 -D 12 bytes including the first bits, the second bits, and the third bits, and a third one of the D 4 -D 12 bytes carrying the first bits, the second bits, and the third bits;
receiving, with the interfaces, wavelength division multiplexed optical signals;
wherein the optical carrier frame format comprising a first synchronous transport signal frame, a second synchronous transport signal frame, and a third synchronous transport signal frame, the synchronous transport signal frames having a synchronous transport signal frame format;
wherein the
terminating, by circuitry of the optical node, the signal at the optical node; and
notifying, by circuitry of the optical node, software of the status of the optical layer in the optical transport network based on at least one of the D 4 -D 12 bytes.

2. The method of claim 1 , wherein the optical carrier (OC-N) frame format is concatenated (OC-3c).

3. The method of claim 1 , wherein the OC-N frame format conforms to rules set forth in GR-253.

4. The method of claim 1 , further comprising:
inspecting, by circuitry of the node, the signal for stable values.

5. The method of claim 1 , wherein the signal is a first signal, the method further comprising the steps of:
writing, with the software, the status of the optical layer in the optical transport network into a second signal comprising a second overhead; and
initiating, with the software, transmission of the second signal.

6. The method of claim 5 , wherein the status is indicative of at least one of equipment status, incoming signal status, and connectivity information.

7. The method of claim 1 , wherein the circuitry of the optical node comprises an optical supervisory channel framer, an optical supervisory receiver, and a filter, wherein the filter notifies the software of the status of the optical layer in the optical transport network.

8. The method of claim 1 , wherein the optical layer is an optical transmission section layer.

9. The method of claim 1 , wherein the Backward Defect Indication Payload field is a one-bit field, the Backward Defect Indication Overhead field is a one-bit field, the Payload Missing Indicator field is a one-bit field, and
one of the D 4 -D 12 bytes includes a Optical Transmission Section Trail Trace Identifier field is an eight-bits field.

10. The method of claim 9 , wherein the the first byte is byte D 4 ;
wherein the second and third bytes are bytes D 7 and D 10 byte, respectively; and
wherein the Optical Transmission Section Trail Trace Identifier field comprises eight-byte groups carried within bytes D 5 , D 6 , D 8 , D 9 , D 11 , D 12 , and in the second synchronous signal frame overhead bytes, and in the third synchronous transport overhead bytes.

11. The method of claim 1 , wherein the optical layer is an optical multiplex section layer.

12. The method of claim 11 , the Backward Defect Indication Payload field is a first Backward Defect Indication Payload field, the Backward Defect Indication Overhead field is a first Backward Defect Indication Overhead field, and the Payload Missing Indication field is a first Payload Missing Indication field,
a second frame of an optical carrier (OC-N) multi-frame, including a second Backward Defect Indication Payload field, a second Backward Defect Indication Overhead field, a Payload Missing Indication/Forward Defect Indication Payload field, and a Forward Defect Indication Overhead field.

13. The method of claim 12 , wherein the second Backward Defect Indication Payload field is a one-bit field, the second Backward Defect Indication Overhead field is a one-bit field, the Payload Missing Indication/Forward Defect Indication Payload field is a two-bit field, and the Forward Defect Indication Overhead field is a one bit field.

14. The method of claim 13 , wherein the first byte is byte D 4 , and the second and third bytes are bytes D 7 and D 10 .

15. The method of claim 1 , wherein the optical layer is an optical channel layer.

16. The method of claim 15 , wherein information indicative of status in the overhead is assigned to a third frame through a two-hundred-fifteenth frame of an optical carrier (OC-N) multi-frame, comprising a Forward Defect Indication Overhead field, a Forward Defect Indication Payload/Open Connection Indication field, the Backward Defect Indication Payload field, a Client Signal Failure field, and an Optical Channel Layer Trail Trace Identifier field.

17. The method of claim 16 , wherein the Forward Defect Indication Overhead field is a one bit field, the Forward Defect Indication Payload/Open Connection Indication field is a two-bit field, the Backward Defect Indication Payload field is a one-bit field, the Client Signal Failure field is a one-bit field, and the Optical Channel Layer Trail Trace Identifier field is an eight-bit field.

18. The method of claim 17 , wherein the first byte is a D 4 byte,
and the second and third bytes are bytes D 7 and D 10 , respectively; and
wherein the Optical Transmission Section Trail Trace Identifier field comprises eight-byte groups carried within the first synchronous transport signal frame overhead bytes D 5 , D 6 , D 8 , D 9 , D 11 , D 12 , and in the second synchronous signal frame overhead bytes, and in the third synchronous transport overhead bytes.

19. The method of claim 1 , wherein the optical layer is a super channel.

20. A method comprising the steps of:
receiving, by circuitry of an optical node adapted for wavelength multiplexing and wavelength switching, a signal over an optical control channel, the signal conforms to an optical carrier (OC-N) frame format, and the signal includes a transport overhead portion of a synchronous transport signal frame format, the transport overhead portion including D 4 -D 12 bytes, a first one of the D 4 -D 12 bytes including first bits of a Backward Defect Indication Payload field, second bits of a Backward Defect Indication Overhead field, and third bits of a Payload Missing Indicator field, the first bits, the second bits, and the third bits being indicative of a status of an optical layer in an optical transport network, a second one of the D 4 -D 12 bytes including the first bits, the second bits, and the third bits, and a third one of the D 4 -D 12 bytes carrying the first bits, the second bits, and the third bits;
receiving, with the interfaces, wavelength division multiplexed optical signals;
terminating, by circuitry of the optical node, the signal at the optical node; and
notifying, by circuitry of the optical node, software of the status of the optical layer in the optical transport network based on at least one of the D 4 -D 12 bytes.

21. A network that complies with an Optical Transport Network, t

Assignees

• Rao Rajan
• Sprague Edward E
• Lu Biao
• Syed Sharfuddin
• Infinera Corp

Inventors

• Rao Rajan
• Sprague Edward E
• Lu Biao
• Syed Sharfuddin

Classifications

• H04J14/0212

  using optical switches or wavelength selective switches [WSS] · CPC title

• H04J14/0268

  Restoration of optical paths, e.g. p-cycles · CPC title

• H04J14/0275

  using an optical service channel · CPC title

• H04B2210/072

  using an overhead signal · CPC title

• H04J2203/0096

  Serial Concatenation · CPC title