In multichannel telephone systems, a plot, for the busy hour, of the equivalent mean power and the peak power as a function of the number of voice channels.
Note: The equivalent power of a multichannel signal referred to the zero transmission level point is a function of the number of channels and has for its basis a specified voice channel… (Read More →)

A coil that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance.
Note 1: Loading coils inserted periodically in a pair of wires reduce the attenuation at the higher voice frequencies up to the cutoff frequency of the low-pass filter formed by (a) the inductance of the coils and distributed inductance… (Read More →)

1. An identifiable segment of an antenna radiation pattern.
Note: A lobe is characterized by a localized maximum bounded by identifiable nulls.
2. A pair of channels between a data station and a lobe attaching unit, one channel for sending and one for receiving, as seen from the point of view of the attached data station.

In a ring network, a functional unit used to connect and disconnect data stations to and from the ring without disrupting network operations.

Under the terms of the Modification of Final Judgment (MFJ), a geographical area within which a divested Bell Operating Company (BOC) is permitted to offer exchange telecommunications and exchange access services.
Note: Under the terms of the MFJ, the BOCs are generally prohibited from providing services that originate in one LATA and terminate in another.

Also referred to as service… (Read More →)

The process of modifying a product that has hard-coded biases of one culture to the hard-coded biases of another culture [POSIX.0].

A data communications system that (a) lies within a limited spatial area, (b) has a specific user group, (c) has a specific topology, and (d) is not a public switched telecommunications network, but may be connected to one.
Note 1: LANs are usually restricted to relatively small areas, such as rooms, buildings, ships, and aircraft.
Note 2: An interconnection of… (Read More →)

1. In telegraphy, the source of power that actuates the telegraphic station recording instruments, as distinguished from the source of power that furnishes current to the line.
2. In telephony, a system in which each telephone instrument has its own source of power, as opposed to being powered from the central office.
3. A source of local power for a… (Read More →)

1. Any call using a single switching facility.
2. Any call for which an additional charge, i.e., toll charge, is not made to the calling or called party.
Note: Calls such as those via "800" numbers do not qualify as local calls, because the called party is charged.

Synonym central office.