Apparatus and method for controlling initialization of a DMT...

Details Apparatus and method for controlling initialization of a DMT... Apparatus and method for controlling initialization of a DMT...

2005-01-18

2005-01-18

Pezzlo, John (Department: 2662)

Multiplex communications

Pathfinding or routing

Fdm switching

C370S282000, C370S252000, C375S272000

Reexamination Certificate

active

06845103

ABSTRACT:
An apparatus for controlling initialization of a discrete multi-tone (DMT) system is provided in which a connection between first and second devices is acknowledged by using a plurality of connection acknowledgment tone frequencies to thereby improve the reliability of the activation/acknowledgment procedure. The method includes transmitting a first connection acknowledgment tone signal at a predetermined frequency from the first device to the second device; detecting a first response tone signal transmitted from the second device; transmitting a second connection acknowledgment tone signal to the second device if the first response tone signal is not detected for a predetermined time; and detecting a second response tone signal inputted from the second device to thereby acknowledge a connection to the second device.

REFERENCES:
patent: 6219378 (2001-04-01), Wu
patent: 6459678 (2002-10-01), Herzberg
patent: 6577598 (2003-06-01), Hwang et al.
patent: 6636525 (2003-10-01), Davis
ANSI T1.413-1995 Network and Customer Installation Interfaces—ADSL Metallic Interface, Section 12, 1995.*
Chow, DMT-Based ASDL: Concept, Architecture, and Performance. 1994, IEEE, pp. 3/1-3/6.

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