Patent ID: 7167911

Claim:
A method of controlling data transmission between a subscriber-end transceiver and an exchange-end transceiver connected to each other by a data transmission path, the method comprising: generating a deactivation signal at a system control device when a data stream to be transmitted carries no payload in either of two data stream directions; in response to the deactivation signal, storing exchange-end transmission coefficients for the data transmission path in an exchange memory of an exchange-end transceiver; transmitting the deactivation signal on the data transmission path from the exchange-end transceiver to the subscriber-end transceiver; in response to receiving the deactivation signal, storing subscriber-end transmission coefficients for the data transmission path in a subscriber-end memory unit in the subscriber-end transceiver; transmitting the deactivation signal back to the exchange-end transceiver from the subscriber-end transceiver on the data transmission path; in response to receiving the deactivation signal back from the subscriber-end transceiver, stopping data transmission on the data transmission path at the exchange-end transceiver; in response to detecting the stopping of data transmission at the exchange-end transceiver, stopping data transmission at the subscriber-end transceiver; placing the exchange-end transceiver and the subscriber-end transceiver in a stand-by state; wherein the exchange-end transceiver and the subscriber-end transceiver are configured to use first and second operational channels to preset parameters for a stand-by state, and to use first and second operational channels to preset parameters for a hot start; and continuously interrupting the stand-by state with a device selected from the group consisting of the exchange-end transceiver and the subscriber-end transceiver to inspect a characteristic of the data transmission path by requesting a signal indicative of the characteristics of the data transmission path; and on the basis of the requested signal, matching an echo elimination device and an equalization device to the characteristics of the data transmission path.