| 摘要 |
The circuit comprises transmitting and receiving section (10) for transmitting and receiving data to and from a key phone, the first transformer (T2) for matching data via data connectors (P1,P2), the second transtormer (T1) connected to the key phone network for matching voice call of a subscriber via voice connectors (L1,L2), the first switching means for selecting a key phone or a common telephone by connection to the secondary winding (m2) of the second transformer (71), and the second switching means for selecting key phone or phone by connection to the secondary winding (m3), and a sensing section (50) for sensing ring supply and hook on, off by connection to the second transformer (T1).
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