The plastic overcoat in intimate contact with the cladding of an optical fiber, applied during the manufacturing process.
Note 1: The primary coating typically has an outside diameter of approximately 250 to 750 m, and serves to protect the fiber from mechanical damage and chemical attack. It also enhances optical fiber properties by stripping off cladding modes, and in the… (Read More →)

1. Any group of two or more (three, in most applications) discrete colors (optical wavelengths) that are (a) of relatively narrow spectral width, and (b) visible to the normal human visual system (eyes and nervous system, including the brain), the additive mixture of which colors may be perceived by humans with normal color vision as any of a theoretically infinite… (Read More →)

A system of alternating current distribution for supplying the primaries of distribution transformers from the generating station or substation distribution buses.

1. A frequency that is assigned for usual use on a particular circuit.
2. The first-choice frequency that is assigned to a fixed or mobile station for radiotelephone communications.

A frequency source that meets national standards for accuracy and operates without the need for calibration against an external standard.
Note: Examples of primary frequency standards are hydrogen masers and cesium beam frequency standards.

See group.

A carrier chosen by a subscriber to be accessible via simplified dialing pattern. [T1.246-1998/99]

The point code identification of the primary destination of the signaling connection control plan (SCCP) routing verification test (SRVT) message. [T1.226-1992]

Synonym primary coating.

Synonym primary coating.