TABLE OF CONTENTS Level: 1
Definition: In a most general sense, radio is wireless transmission and reception by means of electromagnetic waves. At various frequencies radio not only supports the systems of audio and video broadcasting in the modern world today but provides the basis for wireless telephony, radar, satellite navigation systems, and emergency response systems. These different uses of radio conform to different uses of the radio spectrum, with audible signals encoded in electromagnetic waves in the approximate frequency range from 3 kilohertz to 300,000 megahertz. (See also RF and Spectrum.)
(See RBDS .)
(See RDS .)
(See RF .)
(See RFI .)
(See RFR .)
Level: 3
Definition: Used to authenticate dial-in users attempting to access the Internet, RADIUS provides a client/server protocol and software that enables authentication to be processed through a central server. RADIUS allows a company or organization to maintain user profiles in a central database that all remote servers can share, thus providing better security and allowing a company to set up policies and procedures that can be applied at a single administered network point. RADIUS also tracks usage for billing purposes and for keeping network statistics. (See also Authentication, Dial-up, and ISP.)
Level: 3
Definition: A computer storage device containing several hard disk drives in a single housing offering redundant data protection...
