Modem is a device that converts digital signals into analogue
signals and analog signals into digital signals.
They send and receive data from one computer to another
using telephone lines.
In order for the data to be received and sent, both
computers should have modems
The term modem stands for Modulation and Demodulation.
Modulation:
The process of converting digital signal into analogue signal
is called modulation.
The computer stores data in digital form.
It is converted
into analog form by the modem in order to be transmitted via telephone lines to
another computer.
Demodulation:
The process of converting analogue signal into digital
signal is called as demodulation.
The modem of the receiving computer receives data in
analogue form and then converts it into digital form to be received by the
computer.
Characteristics of modem:
Speed
This is the rate at which modem can send data in bypes per
second.
The speed of modems varies from 300 bps to 56 kbps.
Testing
The modems can test the digital connection with a computer
and they can also test analog connection with
remote modem.
Voice over Data
Modems can provide the facility of voice conversation while
the data is being transmitted.
Error control:
Modems use different methos of controlling errors for
transmitted data.
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