Patent ID: 7296086
Filing Date: 2007-11-13
Classification: H04L,H04M

Abstract:
1. A method handshaking between two digital subscriber loop (DSL) modems, the method comprises: transmitting, by a central office DSL modem, an initiation signal that utilizes a pattern of symbol times to indicate timing and long range handshake mode; interpreting, by a remote DSL modem, the initiation signal to be a C-SYNC signal or a C-TONE signal, wherein the C-SYNC signal indicates a synchronous mode of handshaking; when the initiation signal was interpreted to be the C-SYNC signal, preparing, by the remote DSL modem, 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, wherein the R-SYNC signal includes an acceptance of the synchronous mode of the handshaking; providing, by the remote DSL modem, the response signal to the central office DSL modem; interpreting, by the central office DSL modem, the response signal to determine whether the response signal is the R-SYNC signal, the R-TONE signal, or the R-FLAG signal; when the response signal is the R-SYNC signal, providing, by the central office DSL modem, 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, providing, by the remote DSL modem, the R-FLAG signal in accordance with the symbol rate for the synchronous mode of the handshaking; and in response to the R-FLAG signal, providing, by the central office DSL modem, a C-FLAG signal in accordance with the symbol rate for the synchronous mode of the handshaking.