The interval from the instant a transmitter is keyed-off to the instant the transmitted radio frequency (rf) signal amplitude has decreased to a specified level, usually 10% of its key-on steady-state value.

A one-way 15-kHz program system comprised of a transmitting terminal connected via a DS1 digital link to a receiving terminal. [T1.305-1990]

Equipment that transforms signals derived from frequency-division multiplex equipment, such as group or supergroups, to time-division-multiplexed signals having the same structure as those derived from PCM multiplex equipment, such as primary or secondary PCM multiplex signals, and vice versa.

1. The property of an entity that allows another entity to pass thorough it without altering either of the entities.
2. In telecommunications, the property that allows a transmission system or channel to accept, at its input, unmodified user information, and deliver corresponding user information at its output, unchanged in form or information content.
Note: The user information may be… (Read More →)

An interface that allows the connection and operation of a system, subsystem, or equipment with another without modification of system characteristics or operational procedures on either side of the interface.

A loopback in which the signal is transmitted beyond the loopback point (the forward signal).

See transparency.

1. An automatic device that receives, amplifies, and retransmits a signal on a different frequency.
2. An automatic device that transmits a predetermined message in response to a predefined received signal.
Note: An example of transponders is in identification-friend-or-foe systems and air-traffic-control secondary radar (beacon radar) systems.
3. A receiver-transmitter that will generate a reply signal upon proper interrogation. [JP1]

1. In telecommunications, to convey information from one location to another. [J. Beaty, FAA]
2. Facilities associated with the carriage of OC-1 or higher level signals.
3. A process used to convey data from one point to another point or points by placing the data in defined structures (packets) in accordance with a standard or an RFC. Examples include ISO/IEC… (Read More →)

See Open Systems Interconnection--Reference Model.