Acronym for code-excited linear prediction.

1. In frequency modulation, the rest frequency, i.e., the frequency of the unmodulated carrier. Synonym carrier frequency.
2. The frequency of the middle of the bandwidth of a channel. [47CFR]
3. In facsimile systems, the frequency midway between the picture-black and picture-white frequencies.

1. A common carrier switching center in which trunks and/or loops are terminated and switched.
Note: In the DOD, "common carrier" is called "commercial carrier. " Synonym switch. Other synonyms [loosely] end office, exchange, local central office, local exchange, local office, switching exchange, telephone exchange.
2. A switching unit, in a telephone system which provides service to the general public,… (Read More →)

The sub-NPA code in a TN, i.e., digits D-E-F of a 10-digit NANP Area address. Central office codes are in the form “NXX,” where N is a number from 2 to 9 and X is a number from 0 to
9. Central office codes may also be referred to as “NXX codes. ” (47 C. F. R. §
5
2.… (Read More →)

Loosely, in the sense of a trunk between public and private switches, a synonym for central office trunk. See trunk.

The first three digits (N) of the seven-digit telephone number assigned to a customer's telephone exchange service when dialed on a local basis. [NECA/FCC] Synonym [loosely]prefix.

Loosely, in the sense of a trunk between public and private switches, a synonym for central office connecting facility. See trunk.

See CPU.

Synonym CPU.

A function of a usually centrally located attendant console that permits the control of multiple switches, some of which may be geographically remote.