Key-encryption-key held in common by a group of potential communicating entities and used to establish ad hoc tactical networks. [INFOSEC-99]

A specified bit pattern that indicates the start of a transmission frame.

1. In programming languages, a language construct that represents a set of declarations or a step in a sequence of actions.
2. In computer programming, a symbol string or other arrangement of symbols.
3. In computer programming, a meaningful expression or generalized instruction, represented in a source language.

Data that are relatively long-lived in comparison to ephemeral data, and which have a longer period of validity.
Note: Static data may include static domain parameters and static public or private keys. Both static and ephemeral data are valuable ingredients for building robust key agreement protocols. [After X9.42]

See serial-to-parallel conversion.

One or more transmitters or receivers or a combination of transmitters and receivers, including the accessory equipment, necessary at one location for carrying on a radiocommunication service, or the radio astronomy service. Each station shall be classified by the service in which it operates permanently or temporarily. [NTIA] [RR]

Within a facility, a separate battery power source that satisfies all significant requirements for dc input power associated with the facility.
Note: Station batteries are usually centrally located. The batteries may power radio and telephone equipment as well as provide emergency lighting and controls for the equipment.

In a station, the principal clock, or alternate clock, that provides the timing reference at the station.

See customer premises equipment.

The total power requirements of the integrated station facilities.