A modem modulates outgoing digital
signals from a computer or other digital device to analog
signals for a conventional copper twisted pair telephone
line and demodulates the incoming analog signal and converts it to a digital signal for the digital
device.
In recent years, the 2400 bits per second modem
that could carry e-mail has become obsolete. 14.4 Kbps and 28.8 Kbps modems were
temporary landing places on the way to the much higher bandwidth devices and
carriers of tomorrow. From early 1998, most new personal computers came with 56 Kbps modems. By
comparison, using a digital Integrated Services Digital
Network adapter instead of a conventional modem, the same telephone wire can now carry up to
128 Kbps. With Digital Subscriber Line (DSL) systems, now
being deployed in a number of communities, bandwidth on twisted-pair can be in the megabit
range.
This was last updated in November 2006
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