AZTECH MODEM ROUTER
- 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 digital data.
Modems can be used over any means of transmitting analog signals, from light emitting diodes to radio.
- 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 telephone channel.
- 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 (bit/s, or bps), or bytes per second (B/s). 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.
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