Patent ID: 7508867

Claim:
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, but using different carrier frequencies; 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 different 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, wherein each of said first, second and third MS signals include an identification field and a standard information field.