Synonym leaky ray.

Transport User Profile Functional Entity

A mathematical model of a device that changes its internal state and reads from, writes on, and moves a potentially infinite tape, all in accordance with its present state, thereby constituting a model for computer-like behavior.

In a half-duplex circuit, the time required to reverse the direction of transmission from transmit to receive or vice versa.

Pertaining to a procurement process that (a) includes contractual actions at least through the system, subsystem, or equipment installation phase and (b) may include follow-on contractual actions, such as testing, training, logistical, and operational support.
Note: Precise definition of the types of allowable contractual features are contained in the Federal Acquisition Regulations (FAR).

Television

A cable composed of two parallel conductors separated from each other by a ribbon-like insulator or encased by a foam insulator. Synonym twin-lead.

See independent-sideband transmission.

Synonym twin cable.

A frequency-shift-keyed (FSK) carrier telegraphy system in which four unique tones, i.e., two pairs of tones, are transmitted over a single transmission channel, such as one twisted pair.
Note: One tone of each pair represents a "mark" and the other a "space. "