Fast initialization using seamless rate adaptation

• US 20020137467A1
• Filed: 01/16/2002
• Published: 09/26/2002
• Est. Priority Date: 01/16/2001
• Status: Active Grant

• Current Assignee: Intellectual Ventures II LLC (Intellectual Ventures LLC)
• Original Assignee: Aware Incorporated (Crowley Holdings Preferred LLC)
• Inventors: Tzannes, Marcos C.
• Granted Patent: US 6,654,410 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5652 Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
• CPC Class Codes: H04L 2012/5665 Interaction of ATM with other protocols
• CPC Class Codes: H04L 2012/5672 Multiplexing, e.g. coding, scrambling
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 5/1446 of transmission speed
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: Y02D 30/50 : in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A method for initializing modems in a multicarrier transmission system to establish a communication link between the transmitter and the receiver. An exemplary embodiment includes the steps of providing a predetermined parameter value that approximates a corresponding actual parameter value of the communication link, establishing a data communication link between a first transceiver and a second transceiver using the predetermined parameter value to allow the transmission of data, determining the actual parameter value, and seamlessly increasing the data rate of the established data communication link by using the determined actual parameter value to provide an steady state communication link with an updated data rate.

Claims

1. A method for initializing transceivers in a multicarrier transmission system to establish a communication link between the transceivers comprising:

providing at least one predetermined parameter value, having an associated first data rate, that approximates at least one corresponding actual parameter value of the communication link;

establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the at least one actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between the transceivers at the first data rate;

determining the actual parameter value, associated with a second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value; and

seamlessly adapting the first data rate of the established communication link to the second data rate.

2. The method of claim 1, wherein the at least one predetermined parameter value is a plurality of predetermined parameter values that approximate a plurality of actual parameter values.

3. The method of claim 2, wherein the data communication link is established using the plurality of predetermined parameter values.

4. The method of claim 3, wherein the first data rate is lower than the second data rate associated with the plurality of actual parameter values.

5. The method of claim 3, wherein the first data rate is higher than the second data rate associated with the plurality of actual parameter values.

6. The method of claim 3, further including the step of determining each of the plurality of actual parameter values.

7. The method of claim 6, wherein the first data rate of the data communication link is seamlessly increased using the determined plurality of actual parameter values.

8. The method of claim 6, wherein the step of determining each of the plurality of actual parameter values is attained iteratively in a manner wherein at least one actual parameter value is determined in each iteration.

9. The method of claim 8, further including the steps of iteratively seamlessly increasing the first data rate of the data communication link after each iteration as the at least one actual parameter value is determined in each iteration.

10. The method of claim 1, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

11. The method of claim 1, wherein the step of seamlessly adapting the first data rate to the second data rate comprises:

providing a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

providing a second bit allocation table at the transceivers for transmitting codewords at the second data rate,

synchronizing use of the second bit allocation table between the transceivers; and

using the second bit allocation table to transmit codewords at the second data rate, wherein the specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords in the first data rate are also used to transmit codewords in the second data rate to achieve a seamless change in data rate.

12. The method of claim 1, wherein the step of seamlessly adapting the first data rate to the second data rate comprises:

providing a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

transmitting a first plurality of codewords at the first data rate;

changing the first data rate to the second data rate; and

transmitting a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

13. The method of claim 1, wherein the step of seamlessly adapting the first data rate to the second data rate comprises:

using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

transmitting a message to change from the first data rate to the second data rate;

using a second bit allocation table at the transceivers for transmitting at the second data rate;

synchronizing use of the second bit allocation table between the transceivers; and

transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in transmission data rate.

17. The method of claim 16, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

18. The method of claim 16, wherein the step of seamlessly increasing from the first data rate to the second data rate comprises:

providing a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

transmitting a first plurality of codewords at the first data rate;

changing the first transmission data rate to a second data rate; and

transmitting a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

19. The method of claim 16, wherein the step of seamlessly increasing from the first data rate to the second data rate comprises:

using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

transmitting a message to change from the first data rate to the second data rate;

using a second bit allocation table at the transceivers for transmitting at the second data rate;

synchronizing use of the second bit allocation table between the transceivers; and

transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

79. The method of claim 1, wherein the second data rate is a steady state data rate.

80. The method of claim 1, wherein the data communication link transmits and receives user data.

14. In a multicarrier transceiver, a method of initializing to establish a communication link with a second transceiver comprising:

providing at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

determining the actual parameter value, associated with a second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value;

seamlessly adapting the first data rate of the established communication link to the second data rate;

using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

receiving a message from the second transceiver to change from the first data rate to the second data rate;

using a second bit allocation table for transmitting at the second data rate;

synchronizing use of the second bit allocation table between the transceivers by transmitting a flag signal; and

transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

15. In a multicarrier transceiver, a method of initializing to establish a communication link with a second transceiver comprising:

providing at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding at least one actual parameter value of the communication link;

establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the at least one actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

determining the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the steady state communication link using the predetermined parameter value;

seamlessly adapting the first data rate to the second data rate;

using a first bit allocation table to receive a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

transmitting a message from the second transceiver to change from the first data rate to the second data rate;

using a second bit allocation table for transmitting at the second data rate;

synchronizing use of the second bit allocation table between the transceivers by receiving a flag signal; and

receiving codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

16. A modem initializing procedure for initializing modems in a multicarrier transmission system to establish a communication link between a plurality of transceivers, the modem initializing procedure comprising:

exchanging information between the plurality of transceivers to indicate that a data communication link is desired;

determining a channel between the plurality of transceivers that is available for use in establishing the communication link;

accessing at least one predetermined parameter value, having an associated first data rate, that approximates an actual parameter value, having an associated second data rate, of the communication link between the transceivers;

training the transceivers using the at least one predetermined parameter value to designate attributes of the determined channel;

establishing a data communication link through the determined channel using the at least one predetermined parameter value such that the multicarrier transmission system is capable of transmitting user data between the plurality of transceivers, the established data communication link having the first data rate which is lower than the second data rate attainable using the actual parameter value that corresponds to the at least one predetermined parameter value;

analyzing the channel to determine the actual parameter value after establishing the data communication link using the at least one predetermined parameter value; and

seamlessly increasing from the first data rate of the established data communication link to the second data rate.

20. A system that initializes transceivers in a multicarrier transmission system to establish a communication link between the transceivers comprising:

means for providing at least one predetermined parameter value, having an associated data rate, that approximates a corresponding actual parameter value of the communication link;

means for establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between the transceivers at the first data rate;

means for determining the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value; and

means for seamlessly adapting the data first rate of the established communication link to the second data rate.

21. The system of claim 20, wherein the at least one predetermined parameter value is a plurality of predetermined parameter values that approximate a plurality of actual parameter values.

22. The system of claim 20, wherein the data communication link is established using the plurality of predetermined parameter values.

23. The system of claim 22, wherein the first data rate is lower than the second data rate.

24. The system of claim 22, wherein the first data rate of the data communication link established using the plurality of predetermined parameter values is higher than the second data rate.

25. The system of claim 22, further comprising means for determining each of the plurality of actual parameter values.

26. The system of claim 25, wherein the first data rate of the data communication link is seamlessly increased using the determined plurality of actual parameter values.

27. The system of claim 25, wherein the step of determining each of the plurality of actual parameter values is attained iteratively in a manner wherein at least one actual parameter value is determined in each iteration.

28. The system of claim 27, further including means for iteratively seamlessly increasing the first data rate of the communication link after each iteration as the at least one actual parameter value is determined in each iteration.

29. The system of claim 20, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

30. The system of claim 20, wherein the means for seamlessly adapting from the first data rate to the second data rate comprises:

means for providing a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

means for providing a second bit allocation table at the transceivers for transmitting codewords at the second data rate;

means for synchronizing use of the second bit allocation table between the transceivers; and

means for using the second bit allocation table to transmit codewords at the second data rate, wherein the specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate are also used to transmit codewords at the second data rate to achieve a seamless change in data rate.

31. The system of claim 20, wherein the means for seamlessly adapting from the first data rate to the second data rate comprises:

means for providing a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

means for transmitting a first plurality of codewords at the first data rate;

means for changing the first data rate to the second data rate; and

means for transmitting a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

32. The system of claim 20, wherein the means for seamlessly adapting from the first data rate to the second data comprises:

means for using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

means for transmitting a message to change from the first data rate to the second data rate;

means for using a second bit allocation table at the transceivers for transmitting at the second data rate;

means for synchronizing use of the second bit allocation table between the transceivers; and

means for transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

33. A multicarrier transceiver having an initializing procedure that establishes a communication link with a second transceiver comprising:

means for providing at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

means for establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

means for determining the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value;

means for seamlessly adapting from the first data rate of the established communication link to the second data rate;

means for using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

means for receiving a message from the second transceiver to change from the first data rate to the second data rate;

means for using a second bit allocation table for transmitting at the second data rate;

means for synchronizing use of the second bit allocation table between the transceivers by transmitting a flag signal; and

means for transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

36. The system of claim 35, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

37. The system of claim 35, wherein the means for seamlessly increasing from the first data rate to the second data rate comprises:

means for providing a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

means for transmitting a first plurality of codewords at the first data rate;

means for changing the first data rate to the second data rate; and

means for transmitting a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

38. The system of claim 35, wherein the means for seamlessly increasing from the first data rate to the second data rate comprises:

means for using a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

means for transmitting a message to change the first data rate to a second data rate;

means for using a second bit allocation table at the transceivers for transmitting at the second data rate;

means for synchronizing use of the second bit allocation table between the transceivers; and

means for transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

40. The media of claim 39, wherein the at least one predetermined parameter value is a plurality of predetermined parameter values that approximate a plurality of actual parameter values.

41. The media of claim 40, wherein the data communication link is established using the plurality of predetermined parameter values.

42. The media of claim 41, wherein the first data rate of the data communication link established using the plurality of predetermined parameter values is lower than the second data rate attained when the plurality of actual parameter values is used.

43. The media of claim 41, wherein the first data rate of the data communication link established using the plurality of predetermined parameter values is higher than the second data rate attained when the plurality of actual parameter values is used.

44. The media of claim 41, further including information that determines each of the plurality of actual parameter values.

45. The media of claim 44, wherein the data rate of the data communication link is seamlessly increased using the determined plurality of actual parameter values.

46. The media of claim 44, wherein the step of determining each of the plurality of actual parameter values is attained iteratively in a manner wherein at least one actual parameter value is determined in each iteration.

47. The media of claim 46, further including information that iteratively seamlessly increases the first data rate of the communication link after each iteration as the at least one actual parameter value is determined in each iteration.

48. The media of claim 39, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

49. The media of claim 39, wherein the information that seamlessly adapts from the irst data rate to the second data rate comprises:

information that provides a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

information that provides a second bit allocation table at the transceivers for transmitting codewords at the second data rate;

information that synchronizes use of the second bit allocation table between the transceivers; and

information that uses the second bit allocation table to transmit codewords at the second data rate, wherein the specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords in the first data rate are also used to transmit codewords in the second data rate to achieve a seamless change in data rate.

50. The media of claim 39, wherein the information that seamlessly adapts from the first data rate to the second data rate comprises:

information that provides a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

information that transmits a first plurality of codewords at the first data rate;

information that changes the first data rate to the second data rate; and

information that transmits a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

51. The media of claim 39, wherein the information that seamlessly adapts from the first data rate to the second data rate comprises:

information that uses a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

information that transmits a message to change the first data to the second data rate;

information that uses a second bit allocation table at the transceivers for transmitting at the second data rate;

information that synchronizes use of the second bit allocation table between the transceivers; and

information that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in transmission data rate.

34. A multicarrier transceiver having an initialization procedure that establishes a communication link with a second transceiver comprising:

means for providing at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

means for establishing a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

means for determining the actual parameter value corresponding to the at least one predetermined parameter value after establishing the steady state communication link using the predetermined parameter value;

means for seamlessly adapting from the first data rate of the established communication link to the second data rate;

means for using a first bit allocation table to receive a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

means for transmitting a message from the second transceiver to change from the first data rate to the second data rate;

means for using a second bit allocation table for transmitting at the second data rate;

means for synchronizing use of the second bit allocation table between the transceivers by receiving a flag signal; and

means for receiving codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

35. A system for initializing modems in a multicarrier transmission environment to establish a communication link between a plurality of transceivers comprising:

means for exchanging information between the plurality of transceivers to indicate that a communication link is desired;

means for determining a channel between the plurality of transceivers that is available for use in establishing the communication link;

means for accessing at least one predetermined parameter value, having an associated first data rate, that approximates an actual parameter value of the communication link between the transceivers;

means for training the tranceivers using the at least one predetermined parameter value to designate attributes of the determined channel;

means for establishing a data communication link through the determined channel using the at least one predetermined parameter value such that the multicarrier transmission system is capable of transmitting data between the plurality of transceivers, the established data communication link having the first data rate that is lower than a second data rate attainable using the actual parameter value that corresponds to the at least one predetermined parameter value;

means for analyzing the channel to determine the actual parameter value after establishing the data communication link using the at least one predetermined parameter value; and

means for seamlessly increasing the first data rate of the established communication link using the determined actual parameter value to provide the second data rate.

39. An information storage media comprising information that initializes transceivers in a multicarrier transmission system to establish a communication link between the transceivers comprising:

information that provides at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

information that establishes a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between the transceivers at the first data rate;

information that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value; and

information that seamlessly adapts from the first data rate of the established communication link to the second data rate.

52. An information storage media comprising information that, in a multicarrier transceiver, initializes the transceiver to establish a communication link with a second transceiver comprising:

information that provides at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

information that establishes a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

information that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value;

information that seamlessly adapts from the first data rate of the established communication link to the second data rate;

information that uses a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

information that receives a message from the second transceiver to change from the first data rate to the second data rate;

information that uses a second bit allocation table for transmitting at the second data rate;

information that synchronizes use of the second bit allocation table between the transceivers by transmitting a flag signal; and

information that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

53. An information storage media comprising information that, in a multicarrier transceiver, initializes the transceiver to establish a communication link with a second transceiver comprising:

information that provides at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

information that establishes a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

information that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value;

information that seamlessly adapts from the first data rate of the established communication link to the second data rate;

information that uses a first bit allocation table to receive a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

information that transmits a message from the second transceiver to change from the first data rate to the second data rate;

information that uses a second bit allocation table for transmitting at the second data rate;

information that synchronizes use of the second bit allocation table between the transceivers by receiving a flag signal; and

information that receives codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

54. An information storage media comprising a modem initializing procedure for initializing modems in a multicarrier transmission system to establish a communication link between a plurality of transceivers, the media comprising:

information that exchanges a message between the plurality of transceivers to indicate that a communication link is desired;

information that determines a channel between the plurality of transceivers that is available for use in establishing the communication link;

information that accesses at least one predetermined parameter value, having an associated first data rate, that approximates an actual parameter value of the communication link between the transceivers;

information that trains the transceivers using the at least one predetermined parameter value to designate attributes of the determined channel;

information that establishes a data communication link through the determined channel using the at least one predetermined parameter value such that the multicarrier transmission system is capable of transmitting data between the plurality of transceivers, the established data communication link having the first data rate that is lower than a second data rate attainable using the actual parameter value that corresponds to the at least one predetermined parameter value;

information that analyzes the channel to determine the actual parameter value after establishing the data communication link using the at least one predetermined parameter value; and

information that seamlessly increases from the first the data rate of the established communication link using the determined actual parameter value to provide a steady state communication link at the second data rate.

55. The media of claim 54, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

56. The media of claim 54, wherein the information that seamlessly increases from the first data rate to the second data rate comprises:

information that provides a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

information that transmits a first plurality of codewords at the first data rate;

information that changes the first data rate to a second data rate; and

information that transmits a second plurality of codewords at the second data rate,

wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

57. The media of claim 54, wherein the information that seamlessly increases from the first data rate to the second data rate comprises:

information that uses a first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

information that transmits a message to change the first data rate to the second data rate;

information that uses a second bit allocation table at the transceivers for transmitting at the second data rate;

information that synchronizes use of the second bit allocation table between the transceivers; and

information that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

59. The system of claim 58, wherein the at least one predetermined parameter value is a plurality of predetermined parameter values that approximate a plurality of actual parameter values.

60. The system of claim 58, wherein the communication link is established using the plurality of predetermined parameter values.

61. The system of claim 60, wherein the first data rate of the data communication link established using the plurality of predetermined parameter values is lower than the second data rate attained when the plurality of actual parameter values is used.

62. The system of claim 60, wherein the first data rate of the data communication link established using the plurality of predetermined parameter values is higher than the second data rate attained when the plurality of actual parameter values is used.

63. The system of claim 58, wherein the parameter determination module determines each of the plurality of actual parameter values.

64. The system of claim 63, wherein the first data rate of the communication link is seamlessly increased using the determined plurality of actual parameter values.

65. The system of claim 63, wherein the step of determining each of the plurality of actual parameter values is attained iteratively in a manner wherein at least one actual parameter value is determined in each iteration.

66. The system of claim 65, wherein the steady state communication module iteratively seamlessly increases the first data rate of the communication link after each iteration as the at least one actual parameter value is determined in each iteration.

67. The system of claim 58, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

68. The system of claim 58, wherein the steady state communication module seamlessly adapts from the first data rate to the second data rate comprising:

a first bit allocation table that transmits a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

a second bit allocation table at the transceivers that transmits codewords at the second data rate; and

a synchronizing module that synchronizes use of the second bit allocation table between the transceivers,

wherein the second bit allocation table is used to transmit codewords at the second data rate, wherein the specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate are also used to transmit codewords at the second data rate to achieve a seamless change in data rate.

69. The system of claim 58, wherein the steady state communication module seamlessly adapts from the first data rate to the second data rate comprising:

a storage device that provides a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

a first plurality of codewords at the first data rate;

a data rate determination module that changes the first data rate to a second data rate; and

a transmitter that transmits a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

70. The system of claim 58, wherein the steady state communication module seamlessly adapts from the first data rate to the second data rate comprising:

a first bit allocation table that transmits a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

a message that changes from the first data rate to the second data rate;

a second bit allocation table that is used at the transceivers for transmitting at the second data rate;

a synchronization flag that synchronizes use of the second bit allocation table between the transceivers; and

a transmitter that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

58. A system that initializes transceivers in a multicarrier transmission environment to establish a communication link between the transceivers comprising:

a storage device that provides at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

a data communication link between the transceivers that uses the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between the transceivers at a second data rate;

a parameter determination module that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value; and

a steady state communication module that seamlessly adapts from the first data rate of the established communication link to the second data rate.

71. An initialization system for a multicarrier transceiver that establishes a communication link with a second transceiver comprising:

a storage device that providing at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

a data communication link between the transceivers that use the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate

a parameter determination module that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the data communication link using the predetermined parameter value;

a steady state communication module that seamlessly adapts from the first data rate of the established communication link to the second data rate;

a first bit allocation table that transmits a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

a message that is received from the second transceiver to change from the first data rate to the second data rate;

a second bit allocation table that is used to transmit at the second data rate;

a synchronization flag that synchronizes use of the second bit allocation table between the transceivers; and

a transmitter that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

72. A multicarrier transceiver having an initialization protocol to establish a communication link with a second transceiver comprising:

a storage device that provides at least one predetermined parameter value, having an associated first data rate, that approximates a corresponding actual parameter value of the communication link;

a data communication link between the transceivers using the at least one predetermined parameter value as an approximation of the actual parameter value of the communication link to allow the multicarrier transmission system to transmit data between transceivers at h first data rate;

a parameter determination module that determines the actual parameter value, having an associated second data rate, corresponding to the at least one predetermined parameter value after establishing the steady state communication link using the predetermined parameter value;

a steady state communication module that seamlessly adapts from the first data rate of the established communication link to the second data rate;

a first bit allocation table that receives a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

a message that is transmitted from the second transceiver to change from the first data rate to the second data rate;

a second bit allocation table that is used for transmitting at the second data rate;

a synchronization flag that synchronizes use of the second bit allocation table between the transceivers; and

a receiver that receives codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

73. A modem initializing procedure for initializing modems in a multicarrier transmission system to establish a communication link between a plurality of transceivers, the modem initializing procedure comprising:

a message that requests a communication link be established;

a channel determination module that identifies a channel between the plurality of transceivers that is available for use in establishing the communication link;

at least one predetermined parameter value, having an associated first data rate, that approximates an actual parameter value of the communication link between the transceivers;

a training module that trains the transceivers using the at least one predetermined parameter value to designate attributes of the determined channel;

a data communication link that uses the at least one predetermined parameter value such that the multicarrier transmission system is capable of transmitting data between the plurality of transceivers at the first data rate;

an channel analysis module that analyzes the channel to determine the actual parameter value, having an associated second data rate, after establishing the data communication link using the at least one predetermined parameter value; and

a steady state communication module that seamlessly increases from the first data rate of the established communication to a second data rate that is greater than the first data rate.

74. The system of claim 73, wherein the at least one predetermined parameter value and the corresponding actual parameter value are indicative of at least one of a signal to noise ratio, a bit error rate, a bit allocation value, a bit allocation table, a gain value, a gain table, overhead bits of EOC and AOC channels, a codeword size, a number of parity bits in a codeword, depth of an interleaver, a size of an ADSL frame, overhead framing bytes, time domain equalizer values, frequency domain equalizer values, and echo canceller values.

75. The system of claim 73, wherein the steady state communication module seamlessly increasing from the first data rate to a second data rate further comprising:

a plurality of codewords (i) having a specified codeword size, and (ii) including a specified number of parity bits for forward error correction;

a first plurality of codewords that are transmitted at the first data rate;

a data transmission rate module that changes the first data rate to the second data rate; and

a transmitter that transmits a second plurality of codewords at the second data rate, wherein the specified codeword size and the specified number of parity bits for forward error correction used for the first plurality of codewords are used for the second plurality of codewords to achieve a seamless change in data rate.

76. The system of claim 73, wherein the steady state communication module seamlessly increases from the first data rate to a second data rate comprising:

a first bit allocation table that is used to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

a message that changes the transmission data rate from the first data rate to the second data rate;

a second bit allocation table at the transceivers that transmits at the second data rate;

a synchronization flag that synchronizes use of the second bit allocation table between the transceivers; and

a transmitter that transmits codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

77. In a multicarrier transceiver, a method of initializing to establish a communication link with a second transceiver comprising:

providing a first bit allocation table, having an associated first data rate, that approximates a corresponding actual second bit allocation table, having an associated second data rate, of the communication link;

establishing a data communication link between the transceivers using the first bit allocation table as an approximation of the actual second bit allocation table of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

determining the second bit allocation table corresponding to the first bit allocation table after establishing the data communication link using the first bit allocation table;

seamlessly adapting from the first to the second data rate;

using the first bit allocation table to transmit a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

receiving a message from the second transceiver to change from the first data rate to the second data rate;

using the second bit allocation table for transmitting at the second data rate;

synchronizing use of the second bit allocation table between the transceivers by transmitting a flag signal; and

transmitting codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to transmit codewords at the first data rate to achieve a seamless change in data rate.

78. In a multicarrier transceiver, a method of initializing to establish a communication link with a second transceiver comprising:

providing a first bit allocation table, having an associated first data rate, that approximates a corresponding actual second bit allocation table, having an associated second data rate, of the communication link;

establishing a data communication link between the transceivers using the first bit allocation table as an approximation of the actual second bit allocation table of the communication link to allow the multicarrier transmission system to transmit data between transceivers at the first data rate;

determining the second bit allocation table corresponding to the first bit allocation table after establishing the data communication link using the first bit allocation table;

seamlessly adapting from the first data rate of the established communication link to the second data rate;

using the first bit allocation table to receive a plurality of codewords at the first data rate, the plurality of codewords having a specified codeword size and including a specified number of parity bits for forward error correction, and a specified interleaving parameter for interleaving the plurality of codewords;

transmitting a message to the second transceiver to change from the first data rate to the second data rate;

using the second bit allocation table for receiving at the second data rate;

synchronizing use of the second bit allocation table between the transceivers by receiving a flag signal; and

receiving codewords at the second data rate using the same specified interleaving parameter, specified codeword size, and specified number of parity bits for forward error correction that are used to receive codewords at the first data rate to achieve a seamless change in data rate.