| 摘要 |
In a digital subscriber set (31) in which a line receiver (36) receives, when enabled, digital signal bursts from a master terminal (32) and in which a line driver (37) sends, when enabled, digital signal bursts to the master terminal in synchronism with the signal bursts received from the master terminal, a circuit (67, 69, 71, 72) temporarily disables and enables the line receiver and the line driver to send a call orignating signal to the master terminal and then enables and disables the line receiver and the line driver continuously until synchronism is established by at least one digital signal burst which the master terminal supplies to the subscriber set in response to the call originating signal. The circuit recovers synchronism within the shortest possible time when synchronism is lost for any reason during communication. |
