[In INFOSEC, an] initial key, used to start an updating or key generation process. [INFOSEC-99]

To position selectively the access mechanism of a direct access [storage] device.

The time required for the access arm of a direct-access storage device to be positioned on the appropriate track. Synonym positioning time.

In a distributed queue dual bus (DQDB) network, a protocol data unit (PDU) that (a) consists of 52 octets transferred between DQDB-layer peer entities as the information payload of a slot, (b) contains a header of 4 octets and a payload of 48 octets, and (c) is either a pre-arbitrated segment or a queued arbitrated segment.

An encoding law in which an approximation to a curve defined by a smooth encoding law is obtained by a number of linear segments. Synonym piecewise linear encoding law.

Synonym privacy.

The temporary dedication of various parts of a communications system to a specific use, usually in response to a user request for service.
Note: The parts seized may be automatically connected, such as by direct distance dialing (DDD), or may require operator intervention.

In telephone systems, a signal used by the calling end of a trunk or line to indicate a request for service.
Note: A seizure signal also locks out the trunk or line to other demands for service.

Acronym for selective calling. Calling from one station in which call identification is sent to signal automatically one or more remote stations and to establish links among them.
Note 1: Selective calling may be used to un-mute the speakers at designated stations or to initiate a handshake for link establishment.
Note 2: Selective calling is specified in ITU-R Recommendations for… (Read More →)

For a particular message path, any intermediate network between a branch point and a subsequent branch point or convergence point is a selected network. [T1.118-1992]