Synonym aligned bundle.

Phase-shift keying (a) that is used for digital transmission, (b) in which the phase of the carrier is discretely modulated in relation to the phase of a reference signal and in accordance with data to be transmitted, and (c) in which the modulated carrier is of constant amplitude and frequency.
Note: A phase comparison is made of successive pulses, and… (Read More →)

In pulsed carrier transmission, a method of operation in which a fixed phase relationship of the carrier wave is maintained from one pulse to the next.

See coherent.

Pertaining to spare electronic equipment that is available for substitute use, but is not powered or warmed up and ready for use.

[In security, a] procedure for initially keying crypto-equipment. [INFOSEC-99]

Synonym group address.

Routing in which a switching center automatically delivers messages to a specified list of destinations.
Note 1: Collective routing avoids the need to list each single address in the message heading.
Note 2: Major relay stations usually transmit messages bearing collective-routing indicators to tributary, minor, and other major relay stations.

The process by which a divergent or convergent beam of electromagnetic radiation is converted into a beam with the minimum divergence or convergence possible for that system (ideally, a bundle of parallel rays).

A device that renders divergent or convergent rays more nearly parallel.
Note: The degree of collimation (parallelism) should be stated.