The source of electrical power that usually supplies the station main bus.
Note 1: The primary power source may be a Government-owned generating plant or a public utility power system.
Note 2: A Class A primary power source assures, to a high degree of reliability, a continuous supply of ac electrical power.

A protective device placed on telecommunications conductors in accordance with ANSI/NFPA
7
0. [T1.321-1995]

A radiodetermination system based on the comparison of reference signals with radio signals reflected from the position to be determined. [NTIA] [RR]

Radiation that is incident upon a material and produces secondary emission from the material.

The logical connection between extended superframe termination points (i.e., path terminations) on the customer access (CA) and the customer installation (CI). [After T1.217-1991]

An integrated services digital network (ISDN) interface standard (a) that is designated in North America as having a 23B+D channels, (b) in which all circuit-switched B channels operate at 64 kb/s, and (c) in which the D channel also operates at 64 kb/s.
Note: The PRI combination of channels results in a digital signal 1 (T1) interface at the network… (Read More →)

Equipment that provides a timing signal whose long-term accuracy is maintained at 1 x 10-11 or better with verification to Coordinated Universal Time (UTC), and whose timing signal may be used as the basis of reference for the control of other clocks within a network. The primary reference source may generate a timing signal completely autonomous of other references, in… (Read More →)

The predetermined path of a message from its source, i.e., sending or originating station, to a message sink, i.e., receiving, addressee, or destination station.
Note 1: In telephone switchboard operations, the primary route is the route that is attempted first by the operators or equipment when completing a call.
Note 2: Alternate routing is based on network traffic conditions and… (Read More →)

The service area of a broadcast station in which the groundwave is not subject to objectionable interference or objectionable fading. [47CFR]

1. In a data communication network, the station responsible for unbalanced control of a data link.
Note: The primary station generates commands and interprets responses, and is responsible for initialization of data and control information interchange, organization and control of data flow, retransmission control, and all recovery functions at the link level.
2. A radio or television broadcast station whose… (Read More →)