The probability that information transmitted from a communications station will arrive at the intended destination in a timely manner without loss of content.

An orbiting vehicle that relays signals between (a) terrestrial communications stations, (b) a terrestrial communications station and another communications satellite, or (c) other communications satellites.

See saturation.

1. Measures and controls taken to deny unauthorized persons information derived from telecommunications and to ensure the authenticity of such telecommunications.
Note: Communications security includes cryptosecurity, transmission security, emission security, and physical security of COMSEC material. [INFOSEC]
·(a) cryptosecurity: [The] component of communications security that results from the provision of technically sound cryptosystems and their proper use. [NIS]
·(b) emission… (Read More →)

See COMSEC equipment.

See COMSEC material.

The avoidance of any type of transmission, emission, or radiation by any means, including radiation from receiving equipment.
Note: An example of communications silence is the maintaining of a listening watch only if the receivers do not radiate beyond a specified level.

See sink.

See source.

A functional unit or operational assembly that is smaller than the larger assembly under consideration.
Note: Examples of communications subsystems in the Defense Communications System (DCS) are (a) a satellite link with one Earth terminal in CONUS and one in Europe, (b) the interconnect facilities at each Earth terminal of the satellite link, and (c) an optical fiber cable with… (Read More →)