In facsimile systems, the distance between the centers of adjacent scanning spots on adjacent lines measured perpendicular to the scanning line on the object.
Note: The numerical value of the Y-dimension of scanning spot depends upon the type of system.

A linear end-fire antenna, consisting of three or more half-wave elements (one driven, one reflector, and one or more directors).
Note 1: A Yagi antenna offers very high directivity and gain.
Note 2: The formal name for a "Yagi antenna" is "Yagi-Uda array. "

An indication provided to a source device indicating a signal failure condition at a sink device. [T1.107-1988] Synonyms remote alarm indication, yellow alarm signal.

Synonym yellow alarm.

Abbreviation for Zulu time. See Coordinated Universal Time.

Abbreviation for Zulu Time. See Coordinated Universal Time.

A technique applied to a DS1 frame to ensure pulse density requirements are met, where bits 2 through 193 of each frame are scrambled to minimize the occurrence of all-zero octets. When an all-zero octet is contiguous to another octet with zeros and they would combine to violate the ones density requirement, an algorithm is invoked where some all-zero octets… (Read More →)

In a communication system, a point at which the reference level is 1 mW, i.e., 0 dBm.
Note: The actual power level of the communications traffic is not necessarily 0 dBm. It is usually below the reference level. The reference is for system design and test purposes. Synonym zero transmission level point.

Synonym minimum-dispersion window.

See zero-bit insertion.