| 摘要 |
An interface device between a public telephone (9) and an external terminal (14), the public telephone (9) having a control circuit (10) connected to a telephone line (20) and the interface device having a connector (15) accessible to the user. A switching circuit (22) makes it possible to switch the line (20) either to the control circuit of the public telephone (10), or to a connector control circuit. An information circuit of a connection of the external terminal is in the connector, a first electrical insulation module (21) is located between a connector control circuit and the switching circuit (22), a second electrical insulation module (19) is between a connector control circuit and the control circuit of the public telephone (9) and a control circuit of the connector (16).
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