- High-speed transmission medium that can transmit large volumes of
data.
- A transmission medium having a
bandwidth sufficient to carry multiple voice, video or data channels
simultaneously carried on coaxial or fiber-optic cables with a wider
bandwidth than conventional copper telephone lines.
- Each channel occupies (is modulated to) a different frequency
bandwidth on the transmission medium and is demodulated to its original
frequency at the receiving end.
- Channels are separated by guardbands (empty spaces) to ensure that
each channel won't interfere with its neighboring channels.
- This technique is used to provide 50 CATV channels on one coaxial
cable.
- Allows transmission of voice, data, and video simultaneously at rates
of 1.544Mbps or higher. A 28.8 modem can move 28,800 bps.
- The term most commonly refers to T1 (1.544 Mbit/s) rates or better,
even though the actual rate may be much lower or higher, depending on the
application.
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