Coding scheme and multiframe transmission in optical networks

Patent metadata

Field	Value
Publication number	US-10454617-B2
Application number	US-201715727991-A
Country	US
Kind code	B2
Filing date	Oct 9, 2017
Priority date	Mar 26, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

An optical frame is received over an optical link within an optical network. The optical frame contains a payload of aggregated data, an alignment value, and a bit interleaved parity value. The content of the optical frame is aligned based on the alignment value. The bit interleaved parity value is monitored. In response to the monitoring, a transmission quality of the transmission link is determined.

First claim

What is claimed is:

1. A method comprising:
receiving an optical frame over an optical link within an optical network, wherein the optical frame has an alignment value, a bit interleaved parity value, a plurality of payloads of aggregated data and a plurality of forward error correction values;
aligning content of the optical frame based on the alignment value to locate the bit interleaved parity value within the optical frame;
monitoring the bit interleaved parity value;
determining a transmission quality of the optical link based on the bit interleaved parity value; and
performing forward error correction on each of the plurality of payloads using a respective one of the plurality of forward error correction values in response to the determining.

2. The method of claim 1 , wherein each of the plurality of payloads comprises a plurality of 512/513B aggregated data blocks.

3. The method of claim 1 , wherein the bit interleaved parity value comprises a BIP 10 value.

4. The method of claim 1 , wherein the alignment value is split between the a plurality of headers of the optical frame.

5. The method of claim 1 , further comprising:
regenerating the optical frame to produce a regenerated frame; and
transmitting the regenerated frame over another link of the optical network.

6. The method of claim 1 , wherein performing forward error correction on the optical frame comprises generating an error corrected payload for each of the plurality of payloads to generate a plurality of error-corrected payloads, the method further comprising:
de-serializing the optical frame;
removing the alignment value from the optical frame;
descrambling each of the plurality of error-corrected payloads; and
transcoding each of the plurality of error-corrected payloads from 512/513B aggregated data to 64/66B data.

7. The method of claim 6 , wherein the performing error correction on the optical frame takes places after the removing the alignment value from the optical frame.

8. An apparatus comprising:
an optical transceiver; and
a processor coupled to the optical transceiver, and configured to:
receive, via the optical transceiver, an optical frame over an optical link within an optical network, wherein the optical frame has an alignment value, a bit interleaved parity value, a plurality of payloads of aggregated data and a plurality of forward error correction values;
align content of the optical frame based on the alignment value to locate the bit interleaved parity value within the optical frame;
monitor the bit interleaved parity value;
determine a transmission quality of the optical link based on the bit interleaved parity value; and
perform forward error correction on each of the plurality of payloads using a respective one of the plurality of forward error correction values in response to determining the transmission quality of the optical link.

9. The apparatus of claim 8 , wherein each of the plurality of payloads comprises a plurality of 512/513B aggregated data blocks.

10. The apparatus of claim 8 , wherein the bit interleaved parity value comprises a BIP 10 value.

11. The apparatus of claim 8 , wherein the processor is configured to receive a multiframe comprising a plurality of headers, wherein a first header of the plurality of headers includes the bit interleaved parity value, and a second header of the plurality of headers includes at least a portion of the alignment value.

12. The apparatus of claim 11 , wherein the alignment value is split between the second header and a third header of the plurality of headers.

13. The apparatus of claim 8 , wherein the processor is configured to:
regenerate the optical frame to produce a regenerated frame; and
transmit the regenerated frame over another link of the optical network via the optical transceiver.

14. The apparatus of claim 8 , wherein the processor is configured to:
generate an error corrected payload for each of the plurality of payloads while performing forward error correction on the optical frame;
de-serialize the optical frame;
remove the alignment value from the optical frame;
descramble each of the error corrected payloads; and
transcode each of the error corrected payloads from 512/513B aggregated data to 64/66B data.

15. The apparatus of claim 14 , wherein the processor is configured to perform the forward error correction on the optical frame after removing the alignment value from the optical frame.

16. A method comprising:
receiving an optical multiframe over an optical link within an optical network, wherein the optical multiframe comprises a plurality of payloads including aggregated data, an alignment value, a bit interleaved parity value and a forward error correction value, wherein the alignment value is split between at least two of a plurality of headers;
aligning content of the optical multiframe based on the alignment value to locate the bit interleaved parity value within the optical multiframe;
monitoring the bit interleaved parity value;
determining a transmission quality of the optical link based on the bit interleaved parity value; and
performing forward error correction on the optical multiframe with the forward error correction value in response to the determining.

17. The method of claim 16 , wherein optical multiframe comprises a plurality of forward error correction values, and performing forward error correction comprises locating each of the plurality of forward error correction values based upon the alignment value.

18. The method of claim 17 , wherein performing forward error correction comprises performing forward error correction on each of the plurality of the payloads using a respective one of the plurality of forward error correction values.

19. The method of claim 16 , further comprising:
regenerating the optical multiframe to produce a regenerated multiframe; and
transmitting the regenerated multiframe over another link of the optical network.

20. The method of claim 16 , wherein each of the plurality of payloads comprises a plurality of 512/513B aggregated data blocks.

Assignees

• Cisco Tech Inc

Inventors

• Loprieno Gilberto
• Codella Davide

Classifications

• H04L1/201

  Frame classification, e.g. bad, good or erased (frame indication per se H04L1/0082) · CPC title

• H04J3/14

  Monitoring arrangements {(for SDH/SONET rings H04J3/085)} · CPC title

• H04B10/0775

  Performance monitoring and measurement of transmission parameters · CPC title

• H04L1/20

  using signal quality detector · CPC title

• H04J2203/0071

  Monitoring · CPC title