| 摘要 |
<p>The circuit allows a computer or fax machine to share a line, whilst call waiting signals do not directly interfere with device operation. The data transmission equipment comprises a PC terminal (1) and a fax terminal (10), with circuits (21) enabling the connection of both these terminals to a common telephone line (30). Associated with the telephone line there are circuits (11,12,13) for reception and analysis of telephone line signals, specifically the signals sent out by the telephone network indicating that there is a second call waiting. The analysis circuit is able to control local indicators (4,14,15) which inform the user that there is a call waiting, without this information interrupting the operation of either the computer or the fax machine whilst online. A switch (23) within the telephone line sharing unit may be changed from one device to the other, when the it is practical to do so without interrupting communications.</p> |
