Multiple mode of operation handshaking between DSL modems

Details Multiple mode of operation handshaking between DSL modems Multiple mode of operation handshaking between DSL modems

2007-11-13

2007-11-13

Vu, Viet D. (Department: 2154)

Electrical computers and digital processing systems: multicomput

Computer-to-computer protocol implementing

Computer-to-computer handshaking

C709S228000, C709S250000

Reexamination Certificate

active

10688805

ABSTRACT:
A method for handshaking between DSL modems begins when a central office DSL modem transmits an initiation signal that utilizes a pattern of symbol times to indicate timing and long range handshake mode. When the initiation signal was interpreted to be the C-SYNC signal, the remote DSL modem prepares a response signal that is an R-SYNC signal, an R-TONE signal, or an R-FLAG signal in response to the C-SYNC signal. The central office DSL modem interprets the response signal to determine whether it is the R-SYNC signal, the R-TONE signal, or the R-FLAG signal. When the response signal is the R-SYNC signal, the central office DSL modem provides a C-GALF signal to indicate symbol rate for the synchronous mode of the handshaking to the remote DSL modem. In response to the C-GALF signal, the remote DSL modem provides the R-FLAG signal in accordance with the symbol rate for the synchronous mode of the handshaking. In response to the R-FLAG signal, the central office DSL modem provides a C-FLAG signal in accordance with the symbol rate for the synchronous mode of the handshaking.

REFERENCES:
patent: 5170470 (1992-12-01), Pindar et al.
patent: 5696599 (1997-12-01), Tiso
patent: 6188669 (2001-02-01), Bellenger
patent: 6396912 (2002-05-01), Mueller et al.
patent: 6690721 (2004-02-01), Murphy et al.
patent: 6788705 (2004-09-01), Rango

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