| 摘要 |
The present invention relates to a device for connection of a digital apparatus on a telephone line, comprising a line interface (6) which is connected to the telephone line, and a control circuit (8) to control this line interface (6), which can detect a fault in transmission through the line, the line interface (6) and the control circuit (8) each comprising at least one memory (42, 44, 62,64), and exchanging digital information via a galvanic connection. According to the invention, the communication between the line interface (6) and the control circuit (8) is produced according to a protocol during which: the control circuit (8) transmits continuously, and in a loop, to the line interface (6), a first data packet (TX) which is provided with a first address, and receives in return from the line interface (6) a second digital data packet (RX), which is provided with a second address; and the control circuit (8) detects a transmission fault on the line, if the first and second addresses are different.
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