Data Sending/Receiving Method with Forward Error Correction and Related Component and System for Gigabit Ethernet

• US 20110320905A1
• Filed: 06/27/2011
• Published: 12/29/2011
• Est. Priority Date: 06/29/2010
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Feng, Zhishan, Lin, Huafeng, Effenberger, Frank J., Wang, Zhenping
• Granted Patent: US 8,738,988 B2
• Time in Patent Office: Days
• US Class Current: 714/752
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/255 with Low Density Parity Check [LDPC] codes
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 25/4908 using mBnB codes

Abstract

A method for sending data from a transmitter to a receiver in a transmission network comprising receiving outgoing data that is eight-bits-ten-bits (8b10b) encoded at a Gigabit Ethernet (GE) line rate from a physical medium attachment (PMA) layer, 8b10b decoding the received outgoing data, 64-bits-to-66-bits (64b66b) encoding the 8b10b decoded outgoing data, forward error correction (FEC) encoding the 64b66b encoded outgoing data, and serializing and sending the 64b66b and FEC encoded outgoing data at the GE line rate to a physical medium dependent (PMD) layer.

Claims

1. A method for sending data from a transmitter to a receiver in a transmission network comprising:

receiving outgoing data that is eight-bits-ten-bits (8b10b) encoded at a line rate from a physical medium attachment (PMA) layer;

8b10b decoding the received outgoing data;

64-bits-to-66-bits (64b66b) encoding the 8b10b decoded outgoing data;

forward error correction (FEC) encoding the 64b66b encoded outgoing data; and

serializing and sending the 64b66b and FEC encoded outgoing data at the line rate to a physical medium dependent (PMD) layer.

2. The method of claim 1, wherein the line rate is equal to about 1.25 Gigabits per second (Gbps).

3. The method of claim 1 further comprising:

deserializing and byte synchronizing the outgoing data from the PMA layer before 8b10b decoding;

ten Gigabit media independent interface (XGMII) transforming the 8b10b decoded outgoing data;

inserting idle into the XGMII transformed outgoing data to match the line rate before 64b66b encoding;

assembling couples of 66 bits blocks into one FEC payload;

feeding the FEC payload into a FEC encoder for parity generation to obtain a plurality of parity symbols;

appending the parity symbols to the end of a payload of the outgoing data to form a FEC codeword; and

bit width transforming the FEC codeword from 66 bits width to eight bits width before serializing and sending the outgoing data to the PMD layer.

4. The method of claim 3 further comprising:

using systematic Reed-Solomon (RS) FEC coding to obtain the FEC encoded outgoing data.

5. The method of claim 1, wherein the line rate is one of a Gigabit Ethernet (GE) line rate, a 10 GE line rate, and a Fast Ethernet (FE) line rate.

6. A method for sending data from a transmitter to a receiver in a transmission network comprising:

receiving outgoing data that is eight-bits-ten-bits (8b10b) encoded at a line rate from a physical medium attachment (PMA) layer;

8b10b decoding the received outgoing data;

forward error correction (FEC) encoding the 8b10b decoded outgoing data;

scrambling the FEC encoded outgoing data; and

serializing and sending the FEC and scramble encoded outgoing data at the line rate to a physical medium dependent (PMD) layer.

7. The method of claim 6, wherein the line rate is equal to about 1.25 Gigabits per second (Gbps).

8. The method of claim 6 further comprising:

inserting idle into the FEC encoded outgoing data to match the line rate before scrambling the outgoing data;

inserting synchronization header to the FEC encoded outgoing data for FEC codeword synchronization; and

using systematic Reed-Solomon (RS) FEC coding to obtain the FEC encoded outgoing data.

9. The method of claim 6, wherein the line rate is one of a Gigabit Ethernet (GE) line rate, a 10 GE line rate, and a Fast Ethernet (FE) line rate

10. A network component of a physical coding sub-layer comprising:

one or more processing blocks configured to;

receive outgoing data with a first line coding at a first data rate via a physical medium attachment (PMA) interface;

decode the outgoing data at the first line coding;

encode the decoded outgoing data with a forward error correction (FEC) coding and a second line coding that has lower redundancy than the first line coding; and

transmit the outgoing data with the FEC coding and the second line coding at the same first data rate to a physical medium dependent (PMD) component via the PMA interface.

11. The network component of claim 10, wherein the one or more processing blocks are further configured to:

receive incoming data with the first data rate, the second line coding, and the FEC coding from the PMD component via the PMA interface;

decode the incoming data at the FEC coding and the second line coding;

encode the decoded incoming data with the first line coding that has higher redundancy than the second line encoding; and

transmit the incoming data with first line coding at the first data rate to a PMA component via the PMA interface.

12. The network component of claim 10, wherein encoding and decoding the outgoing and incoming data with the FEC coding and the second line coding are transparent to a higher media access control (MAC) layer.

13. The network component of claim 10, wherein the first line coding is an eight-bits-ten-bits (8b10b) line coding, the second line coding is a 64-bits-to-66-bits (64b66b) line coding, and wherein both the first data rate and the second data rate correspond to 1.25 Gigabits per second (Gbps).

14. The network component of claim 10, wherein the first line coding is an eight-bits-ten-bits (8b10b) line coding, and the second line coding is scrambling, and wherein both the first data rate and the second data rate correspond to 1.25 Gigabits per second (Gbps).

15. The network component of claim 10, wherein the FEC coding is systematic Reed-Solomon (RS) FEC coding.

16. The network component of claim 10, wherein using FEC and the second line coding improves link quality and reduces communication errors without sacrificing data payload bandwidth and without using higher cost lasers.

17. A point-to-point (P2P) transmission apparatus comprising:

a host device comprising a plurality of components for Media Access Control (MAC), reconciliation (RS), physical coding sub-layer (PCS), and physical medium attachment (PMA) functions, link establishment, management, and monitoring function, and related services configuration functions; and

a forward error correction (FEC)/PCS component comprising one or more processing units configured to;

receive outgoing data from the host device with a first line coding at a first data rate via a PMA interface coupled to the host device;

decode the outgoing data at the first line coding;

encode the decoded outgoing data with a FEC coding and a second line coding that has lower redundancy than the first line coding;

transmit the outgoing data with the FEC coding and the second line coding at the same first data rate to a physical medium dependent (PMD) component via the PMA interface;

receive incoming data with the first data rate, the second line coding, and the FEC coding from the PMD component via the PMA interface;

decode the incoming data at the FEC coding and the second line coding;

encode the decoded incoming data with the first line coding that has higher redundancy than the second line encoding; and

transmit the incoming data with first line coding at the first data rate to a PMA component via the PMA interface.

18. The P2P transmission apparatus of claim 17, wherein encoding and decoding the outgoing and incoming data with the FEC coding and the second line coding are transparent to a higher media access control (MAC) layer.

19. The P2P transmission apparatus of claim 17, wherein the first line coding is an eight-bits-ten-bits (8b10b) line coding, the second line coding is a 64-bits-to-66-bits (64b66b) line coding, and wherein both the first data rate and the second data rate correspond to 1.25 Gigabits per second (Gbps).

20. The P2P transmission apparatus of claim 17, wherein the first line coding is an eight-bits-ten-bits (8b10b) line coding, and the second line coding is scrambling, and wherein both the first data rate and the second data rate correspond to 1.25 Gigabits per second (Gbps).

21. The P2P transmission apparatus of claim 17, wherein the FEC coding is systematic Reed-Solomon (RS) FEC coding.

22. The P2P transmission apparatus of claim 17 further comprising a PMD transmitter and receiver and a plurality of related accessory circuits.

23. The P2P transmission apparatus of claim 22, wherein the host GE device and the FEC/PCS component are interfaced according to a GE PMA specification, and wherein the FEC/PCS component and the PMD transmitter and receiver are also interfaced according to the GE PMA specification.