Internal modem

Internal modem details

Internal modem details are

A modem that goes inside the box.most internal modem are PCI slot type.

Internal modem is like any other expansion card which is plugged onto the mother board expansion slots.

Internal modems has its own UART chip,which handles data in/out in the serial form.

we have to assign IRQ line and 1/10 address for this UART .one must take care that IRQ line I/O address chosen for this doesnot conflict with serial port of computer telephone line .

These audio signals are transmitted through RJ 11 jack used for telephone lines.

Received incoming audio signals are converted back into serial form by demodulator circuit and their passed through RJ11 Jack used for telephone lines.


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