| 摘要 |
The present invention relates to a network modem apparatus, which may use a conventional coaxial cable even if a digital camera is replaced instead of an analogue camera by including a data conversion unit converting digital data into an analogue signal and outputting the analogue signal, a voltage converting unit receiving a predetermined DC voltage and converting the voltage into a plurality of rated voltages needed, and an external power supply unit for supplying the predetermined DC voltage to an external terminal device through an external short distance network. |
