System and method for resource optimized integrated forward error correction in a DMT communication system

A method for forward error correction in a digital subscriber line modem comprising:

• identifying data services suitable for fastpath (a low-latency) signal transmission;
• identifying data services suitable for interleaving (a higher-latency) signal transmission;
• encoding all data service signals in an encoder to generate an encoded data stream wherein individual codewords comprise both fastpath and interleaved data;
• using a state machine and a fastpath memory to write fastpath encoded data in a fastpath memory;
• using a state machine, an interleave memory, and system encoding parameters to write encoded data associated with higher-latency data services in the interleaved memory wherein individual bytes of the higher-latency data codeword are distributed in time;
• using a state machine and a fastpath memory to read fastpath encoded data from the fastpath memory in response to read requests;
• and
• using a state machine, an interleave memory, and system encoding parameters to read encoded data associated with higher-latency data services from the interleaved memory in response to read requests.

A method for forward error correction in a digital subscriber line modem comprising:

• receiving an encoded digital data signal comprising both a fastpath (a low-latency) signal transmission and an interleaved (a higher-latency) signal transmission;
• processing both the fastpath signal transmission and the interleaved signal transmission through one encoder to generate an encoded data stream;
• using a state machine and a fastpath memory to write fastpath encoded data in a fastpath memory;
• using a state machine, an interleave memory, and system encoding parameters to write an encoded interleaved data signal in an interleaved memory;
• using a state machine and a fastpath memory to read fastpath encoded data from the fastpath memory in response to read requests;
• using a state machine, an interleave memory, and system encoding parameters to read interleaved encoded data from the interleaved memory in response to read requests;
• and
• decoding both the fastpath signal transmission and the interleaved signal transmission in one decoder to restore a digital signal stream comprising a plurality of received data service signals.

A digital subscriber line modem comprising:

• means for encoding a plurality of digital data signals to generate an encoded digital data stream comprising codewords derived from both low-latency digital data (fastpath) and higher-latency digital data (interleave data);
• means for writing low-latency digital data codeword bytes into memory;
• means for writing higher-latency digital data codeword bytes into memory;
• means for reading low-latency digital data coedeword bytes from memory;
• means for reading higher-latency digital data codeword bytes from memory;
• and
• means for controlling the reading steps such that an encoded digital data composite codeword is generated.

A digital subscriber line (DSL) modem comprising:

• means for receiving an encoded digital data signal comprising a plurality of codewords derived from both low-latency digital data (fastpath) and higher-latency digital data (interleave data);
• means for writing low-latency digital data codeword bytes into memory;
• means for writing higher-latency digital data codeword bytes into memory;
• means for reading low-latency digital data coedeword bytes from memory;
• means for reading higher-latency digital data codeword bytes from memory;
• and
• means for controlling the reading steps such that the received encoded digital data signal is deinterleaved to generate a composite encoded digital data codeword in the order it was originally transmitted from a similarly configured remote DSL modem.

A method for pipelining data processing in a digital subscriber modem that uses Reed-Solomon encoding/decoding comprising:

• segmenting a Reed-Solomon decoder into a first stage comprising syndrome calculation and a second stage comprising decoding;
• performing a fastpath data write;
• performing a deinterleave data write and a fastpath data syndrome read operation simultaneously;
• performing a fastpath data decode operation and a deinterleave data syndrome read simultaneously;
• and
• performing a deinterleave data decode operation.