| 摘要 |
A terminal device using a PSTN includes a first line interface having at least four first connection terminals, one pair of the first connection terminals being connected to the PSTN and the other pair of the first connection terminals being connected to either the PSTN or an extended device, and a second line interface having at least four second connection terminals respectively connected in parallel to the first connection terminals. The second connection terminals are divided into two pairs of connection terminals, and if the other pair of the first connection terminals are connected to the extended device, one of one pair of the second connection terminals is connected to one of the other pair of the second connection terminals, and the other of one pair of the second connection terminals is connected to the other of the other pair of the second connection terminals to form jumpers.
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