Patent ID: 6925157
Filing Date: 2005-08-02
Classification: H04M,H04Q

Abstract:
1. A method for operating high-bit-rate data transmission devices on a subscriber line connecting a subscriber terminal device and a telephone exchange, wherein voice information and low-bit-rate data can also be transmitted on the subscriber line, and wherein during a transmission of high-bit-rate data, a connection for transmitting the high-bit-rate data bypasses a core region of the telephone exchange and connects to a data transmission network as a permanent connection between a high-bit-rate data transmission device at the subscriber side and a high-bit-rate data transmission device at the telephone exchange side and an access device of the data transmission network, the method comprising the steps of: in a high-bit-rate data transmission device that terminates a subscriber line at a telephone exchange side and in a high-bit-rate data transmission device that terminates the subscriber line at a subscriber side, outside a context of a data transmission, operating only a signal tone detector to detect an occurrence of a pilot tone in an upstream or downstream channel indicating a beginning of a data transmission; and operating remaining parts of the high-bit-rate data transmission devices only when the signal tone detector detects the occurrence of the pilot tone in the upstream or downstream channel, wherein a digital interface, digital signal processor, analog interface, and a line driver in the high-bit-rate transmission device are switched into an operative state only upon detection of the pilot tone.