In telephone-service security, a link between the card and a terminal starting with the answer to reset (ATR) and ending with a subsequent reset or a deactivation of the card. [T1.707-1998]

The validating process that Includes, but is not limited to, ensuring that a telecommunications charge card has been assigned by the card issuer and that the personal identification number matches the one assigned to that account.

Eight imaginary straight lines extending radially on the ground from an antenna location in the following azimuths with respect to true North: 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°. [47CFR]
Note: The four radials at 0°, 90°, 180°, and 270° of azimuth with respect to true North are referred to as the cardinal points. The cardinal points are equivalent… (Read More →)

In a frequency stabilized system, the sinusoidal component of a modulated wave whose frequency is independent of the modulating wave; or the output of a transmitter when the modulating wave is made zero; or a wave generated at a point in the transmitting system and subsequently modulated by the signal; or a wave generated locally at the receiving terminal which… (Read More →)

1. A wave suitable for modulation by an information-bearing signal.
2. An unmodulated emission.
Note: The carrier is usually a sinusoidal wave or a uniform or predictable series of pulses. Synonym carrier wave.
3. Sometimes employed as a synonym for carrier system.

A code (dialed by the user) to select a specific service provided by the entity to which the code is assigned by the NANPA (North American Numbering Plan Administration); the code used is either 10xxx or 101xxxX where the Xs represent the 3- or 4-digit code that was assigned. The originating switch uses the code to route the call to… (Read More →)

A short-duration loss of carrier signal.

A transmission facility that provides several communication channels over a single bidirectional path. A carrier facility system generally consists of multiplex function at two terminal locations and an interconnecting path consisting of: (1) a higher-level facility system; (2) a facility assembly; or (3) combinations of carrier facility systems and facility assemblies.

1. The nominal frequency of a carrier wave.
2. In frequency modulation, synonym center frequency.
3. The frequency of the unmodulated electrical wave at the output of an amplitude modulated (AM), frequency modulated (FM), or phase modulated (PM) transmitter. [47CFR]
4. The output of a transmitter when the modulating wave is made zero. [47CFR]