Patent ID: 6950459

Claim:
A method for performing a startup session to establish a high speed communication session, comprising having a first communication system transmit a first predetermined signal to a second communication system, the first communication system and the second communication system both supporting a half duplex operating mode, the first predetermined signal being phase reversed at predetermined intervals; detecting the first predetermined signal at the second communication system, the second communication system responding to the first communication system by transmitting a selected signal; halting, for a predetermined time period, the transmission system, the signal by the first communication system when the selected signal is detected by the first communication system, a second predetermined signal indication a half duplex operating mode being transmitted by the first communication system upon an expiration of the predetermined time period, the second communication system stopping the transmission of the selected signal upon detection of the second predetermined signal; and acknowledging the half-duplex mode by the second communication system by the turning OFF of the selected signal, so that a high speed half-duplex mode communication session is established, wherein the halting of the selected signal and the second predetermined signal are associated with a change in system state.