| 摘要 |
<p>A modem unit adapted to be coupled between a land or radio telephone line and terminal equipment, and comprising: modem circuit means (85) coupled to the terminal equipment (250, 251), for modulating data received from the terminal equipment (250, 251) and for demodulating data transmitted to the terminal equipment (250, 251); isolation means (C1, C2, 84), coupled to the modem circuit means (85), for providing DC isolation between the land telephone line and the terminal equipment (250, 251); and a connector (73) which is connectable both to the land telephone line and, via a mobile telephone, to the radio telephone line, the connector (73) having terminals (A-E; A-D) arranged to couple the land telephone line or the radio telephone line to the modem circuit means (85) either directly or via the isolation means (C1, C2, 84). <IMAGE></p> |
