Modems

This section discusses dial-up modems, the digital modulation schemes used for transmission: FSK. QPSK. QAM dial-up modems, ADSL modems and Cable modems.

Modulation Techniques - This area discusses the following modulation techniques to send digital data over an analog line: amplitude modulation, frequency modulations, phase modulation, frequency shift keying, phase shift keying, quadrature phase shift keying and quadrature amplitude modulation.

Dial-Up Modems - The dial-up modem was the first method to send digital data over the telephony analog lines. This section looks at the basic operation of the dial-up modem, the types, features and standards of dial-up modems and the AT command set used to configure the modems.

ADSL Modems - This section discusses the operation and theory behind Asynchronous Digital Subscriber Line (ADSL) modems.

Cable Modems -This area discusses the theory and operation behind Cable Modems and the DOCSIS standard.

If this page has helped you, please consider donating $1.00 to support the cost of hosting this site, thanks.

Return to

TelecomWorld 101

Copyright July 2013 Eugene Blanchard