Patent ID: 6768772
Filing Date: 2004-07-27
Classification: H04L,Y02D

Abstract:
A communication apparatus selectively connectable to a central communication apparatus, comprising:a transmitter that simultaneously transmits a first mode select (MS) signal, a second MS signal, and a third MS signal to the central communication apparatus during a negotiation procedure that designates a predetermined digital subscriber line (xDSL) communication mode, said first, second and third MS signals carrying identical data with an identical timing, said first MS signal having a first carrier frequency equal to 9 times a base family frequency, said second MS signal having a second carrier frequency equal to 17 times said base family frequency, said third MS signal having a third carrier frequency equal to 25 times said base family frequency; and a receiver that receives one of acknowledge (ACK) signals and negative acknowledge (NAK) signals, transmitted from the central communication apparatus, in response to said simultaneously transmitted first, second and third MS signals, wherein said first, second and third carrier frequencies of said first, second and third MS signals and carrier frequencies utilized by said one of said ACK signals and said NAK signals belong to a mutually different band, said negotiation procedure being performed in a full duplex mode, wherein said base family frequency comprises one of 4.3125 kHz and 4.000 kHz.