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A cable modem is a device that enables you to hook up your PC to a local cable TV line and receive data at about 1.5 Mbps.

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Posted by waqasahmad

Runs over the cable coax system
Send/receive over CATV wiring
Use FDM
Very high data rate, BUT:
Group of subscribers in neighborhood share bandwidth

Original cable system only had downstream capabilities
Amplifiers and such were only one direction
System had to be modified to handle two way data
Uses FDM. One frequency for a local neighborhood (usually over fiber)
Within neighborhood uses TDM

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Posted by HamidAliKhan

cable is like a simple modem but it connect your computer television world rather internet.

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Posted by waqqas1

http://en.wikipedia.org/wiki/Cable_modem

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Posted by suresh123

This device plugs directly into your TV cable connection to receive high-bandwidth Internet as provided by your Internet Service Provider

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Posted by michaelcoyne

Cable Modem is basically a device which provides high speed internet connectivity via cable television company which serves as ISP.
Often, a cable company offering Internet service will provide a cable modem to the subscriber.

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Posted by sagitraz