| 摘要 |
PURPOSE: An ADSL gateway apparatus having a VoIP(Voice over Internet Protocol) function is provided to use a telephone in a VoIP mode in the event of normal condition and to use the telephone in a generic telephone mode in the event of abnormal condition. CONSTITUTION: An ADSL gateway apparatus having a VoIP function is comprised of the first connection part(21), the second connection part(22), a voice data conversion circuit(23), the first relay(RY1), the second relay(RY2), and a user switch. The first connection part(21), connected with an ADSL line, inputs data from the ADSL line or outputs data to the ADSL line. The second connection part(22), connected with a telephone, inputs a voice signal from the telephone or outputs a voice signal to the telephone. The voice data conversion circuit(23), installed between the first connection part(21) and the second connection part(22), converts an analog voice signal, transferred between them, into digital data or converts digital data into an analog voice signal. The first relay(RY1) and the second relay(RY2) connect the first connection part(21) directly to the second connection part(22) or to the input of the voice data conversion circuit(23) according to the status of operation power supply to the ADSL gateway apparatus. The user switch is installed between the control contacts and power terminals of the first relay(RY1) and the second relay(RY2).
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