System and method for coding a digital wrapper frame
First Claim
1. In a packet communications system using a ITU-T G.709 Digital Wrapper (DW) Frame format, a method for coding a frame, the method comprising:
- accepting an ITU-T G.709 DW frame with a predetermined number of payload bytes;
outer encoding the digital information with a Reed Solomon (RS) encoding scheme;
interleaving the outer encoded information;
inner encoding the interleaved information using a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoding scheme;
forming an enhanced forward error correction (EFEC) framing having the same number of payload bytes as an ITU-T G.709 Digital Wrapper frame; and
,communicating the EFEC frame.
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Accused Products
Abstract
A system and method are provided for coding a frame in a packet communications system using a G.709 Digital Wrapper Frame format. The method comprises: accepting digital information; outer encoding the digital information with a Reed Solomon (RS) encoding scheme; interleaving the outer encoded information; inner encoding the interleaved information using a BCH encoding scheme; and, forming a G.709 Digital Wrapper frame including payload and parity bytes. More specifically, a standard DW superframe is formed with 122,368 bits of payload and 8192 bits of parity. The outer encoding process uses an RS(1023,1007) parent code. In one aspect, 15 groups of RS(781,765) and 1 group of RS(778,762) codewords are formed per superframe. The inner encoding process uses a BCH(2047,1959) parent code. In one aspect, 64 groups of BCH(2040,1952) codewords are formed per superframe.
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Citations
28 Claims
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1. In a packet communications system using a ITU-T G.709 Digital Wrapper (DW) Frame format, a method for coding a frame, the method comprising:
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accepting an ITU-T G.709 DW frame with a predetermined number of payload bytes; outer encoding the digital information with a Reed Solomon (RS) encoding scheme; interleaving the outer encoded information; inner encoding the interleaved information using a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoding scheme; forming an enhanced forward error correction (EFEC) framing having the same number of payload bytes as an ITU-T G.709 Digital Wrapper frame; and
,communicating the EFEC frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a packet communications system using an ITU-T G.709 Digital Wrapper (DW) Frame format, a method for decoding a frame, the method comprising:
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accepting an enhanced forward error correction (EFEC) frame including payload bytes; inner decoding the EFEC frame using a Bose, Ray-Chaudhuri, Hocquenghem (BCH) decoding scheme; deinterleaving the inner decoded information; outer decoding the digital deinterleaved information with an Reed-Solomon (RS) decoding scheme; and
,supplying an ITU-T G.709 DW frame with the same number of payload bytes as the EFEC frame. - View Dependent Claims (13, 14, 15)
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16. In a packet communications network using an ITU-T G.709 Digital Wrapper (DW) Frame format, a system for coding a frame, the system comprising:
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an outer encoder having an input to accept an ITU-T G.709 DW frame with a predetermined number of payload bytes and an output to supply the ITU-T G.709 DW frame encoded with a Reed Solomon (RS) encoding scheme; an interleaver having an input connected to the outer encoder output, and an output to supply the RS encoded information in an interleaved form; and
,an inner encoder having an input to accept the interleaved information, the inner encoder encoding the interleaved information with a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoding scheme and supplying an enhanced forward error correction (EFEC) frame the same number of payload bytes as the ITU-T G-709 DW frame at an output. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification