Coding Scheme and Multiframe Transmission in Optical Networks

Patent metadata

Field	Value
Publication number	US-2016285547-A1
Application number	US-201514669079-A
Country	US
Kind code	A1
Filing date	Mar 26, 2015
Priority date	Mar 26, 2015
Publication date	Sep 29, 2016
Grant date	—

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 a link within an optical network, wherein the optical frame has a payload including aggregated data, an alignment value and a bit interleaved parity value; 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; and determining a transmission quality of the optical link based on the bit interleaved parity value.

2 . The method of claim 1 , further comprising:
receiving a forward error correction value; and performing forward error correction on the optical frame with the forward error correction value in response to the determining.

3 . The method of claim 1 , wherein the payload includes a plurality of aggregated data blocks.

4 . The method of claim 3 , wherein the payload comprises a plurality of 512/513B aggregated data blocks.

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

6 . The method claim 1 , wherein receiving the optical frame comprises receiving a multiframe comprising a plurality of headers, a plurality of payloads and a plurality of forward error correction fields, 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.

7 . The method of claim 6 , wherein the alignment value is split between the second header and a third header of the plurality of headers.

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

9 . The method of claim 1 , further comprising:
de-serializing the frame; removing the alignment value from the frame; performing forward error correction on the payload to produce error-corrected payload; descrambling the error-corrected payload; and transcoding the error-corrected payload from 512/513B aggregated data to 64/66B data.

10 . A method comprising:
transcoding data into aggregated data; generating forward error correction bits for the aggregated data; generating an alignment value that specifies how content is aligned within an optical frame; generating a bit interleaved parity value for the aggregated data; serializing the aggregated data to produce serialized data; generating the optical frame including the serialized data, the forward error correction bits, the bit interleaved parity value, and the alignment value; and transmitting the optical frame over a transmission link of an optical network.

11 . The method of claim 10 , wherein transcoding the data comprises transcoding 64/66B data to 512/513B data.

12 . The method of claim 10 , wherein generating the bit interleaved parity value comprises generating a BIP-10 value.

13 . The method of claim 10 , wherein generating the optical frame comprises arranging the aggregated data into a plurality of payloads and inserting the alignment value and the bit interleaved parity value into one or more headers of the optical frame.

14 . The method of claim 13 , wherein the bit interleaved parity value is in a first header of the plurality of headers, and at least a portion of the alignment value is arranged in a second header of the plurality of headers.

15 . The method of claim 14 , wherein the alignment value is split between the second header and a third header of the plurality of headers.

16 . The method of claim 10 , further comprising generating an in-band command value, and inserting the in-band command value in the optical frame.

17 . An apparatus comprising:
an optical receiver; and a processor coupled to the optical receiver, and configured to:
receive via the optical receiver an optical frame over a link in an optical network, wherein the optical frame has a payload including aggregated data, an alignment value and a bit interleaved parity value;
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; and
determine a transmission quality of the link based on the bit interleaved parity value.

18 . The apparatus of claim 17 , wherein the processor is further configured to:
receive a forward error correction value; and perform forward error correction on the optical frame with the forward error correction value based on the transmission quality.

19 . The apparatus of claim 17 , wherein the bit interleaved parity value is a BIP 10 value.

20 . The apparatus of claim 17 , wherein the processor is configured to receive a multiframe comprising a plurality of headers, a plurality of payloads and a plurality of forward error correction fields, 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.

Assignees

• Cisco Tech Inc

Inventors

• Loprieno Gilberto
• Codella Davide

Classifications

• H04L1/0063 Primary

  Single parity check · CPC title

• H04J3/14

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

• H04J3/00

  Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q) · CPC title

• H04J2203/0071

  Monitoring · CPC title

• H04L1/201

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