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Cable Modem basics and manufacturers

Broadband connections have become much faster with the transmission of internet data using radio waves over Hybrid fiber coaxial or over RFoG ( Radio Frequency over Glass).

This service is available using cable modem provided by cable service provider for internet or broadband connection. One needs to have coaxial cable coming into house to avail cable modem internet service. It doesn't require any landline telephone connection to the house neither you need to pay for cable TV service if you only want cable internet.

Cable TV uses coaxial cable or combination of both fiber optic and coaxial cable. The Bandwidth of the system is about 750MHz. TV channel spectrum ranges from 50MHz to 550 MHz. This 500 MHz spectrum can accommodate about 83 channels having 6MHz BW each. The spectrum above this is used for digital data transmission.

cable modem

The advantage of cable internet is that it provides faster data rate compare to DSL and Dial-up modems.

Cable modem uses 64QAM for downstream data and QPSK for upstream data channels. The advantage of cable modem is the higher data rate compare to standard telephone system, but it needs availability of cable TV system.

manufacturers

Following table mentions cable modem manufacturers:

Vendor or Manufacturer
NetComm Wireless Limited , www.netcommwireless.com
Cisco
HP
www.vicomsoft.com
www.analog.com
www.bestdata.com

Useful Links

Refer our page on HF radio Modem or High Frequency radio modem Manufacturers/Suppliers.
Refer our page on GSM Modem/GPRS Modem Manufacturers/Suppliers.
Refer our page on Satellite Modem Manufacturers/Suppliers.
Refer our page on dsl Modem basics and manufacturer of dsl modem.
Refer our page on dial-up-modem basics and manufacturer of dial-up modem.

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