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- A modem (modulator-demodulator) is a
device that modulates an analog carrier signal to encode digital
information, and also demodulates such a carrier signal to decode
the transmitted information.
- The goal is to produce a signal that
can be transmitted easily and decoded to reproduce the original
- Modems can be used over any
means of transmitting analog signals, from light emitting diodes to
- The most familiar example is a
voice band modem that turns the digital data of a personal computer
into modulated electrical signals in the voice frequency range of a
- These signals can be transmitted over
telephone lines and demodulated by another modem at the receiver
side to recover the digital data Modems are generally classified by
the amount of data they can send in a given unit of time, usually
expressed in bits per second
- Modems can alternatively be
classified by their symbol rate, measured in baud.
- The baud unit
denotes symbols per second, or the number of times per second the
modem sends a new signal
- Modulation is the process of changing
the form of the signal carrying the information.
- The demodulation process does
the task of extracting information from the signals that are
- Analog signals can be
transmitted by using devices such as a radio or a diode.
- Modems are classified on the
basis of two criteria,
data sent per unit time, change in the state of the signal per unit
- A computer sends information in the
form of digital signals.
- But the information over the
telephone lines needs to be transmitted in the form of analog
- To solve this problem, the
functionality of a modem comes into play.
- It converts the digital signals into
- These analog signals are carried
over the telephone lines.
- When these signals reach another
computer, the analog signals are converted back to the digital form
by its modem.
- In addition to converting digital
signals into analog signals, the modems carry out many other tasks.
- Modems minimize the errors that occur
while the transmission of signals.
- They also have the functionality of compressing the data sent via signals.
- Modems also do the task of
regulating the information sent over a network.
- Error Correction : In
this process the modem checks if the information they receive is
- The modems involved in
error correction divide the information into packets called frames.
- Before sending
this information, the modems tag each of the frames with checksums.
- Checksum is a method
of checking redundancy in the data present on the computer.
- The modems that
receive the information, verify if the information matches with
checksums, sent by the error-correcting modem.
- If it fails to
match with the checksum, the information is sent back.
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