AT&T 7100 series, 7500 series, 2500 series, 7200 series, 7400 series, 7300 series manual BX.25 DCIU/PI

Models: 7400 series 2500 series 7200 series 7500 series 7300 series 7100 series

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GLOSSARY GL-13

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final trunk group

A last-choice trunk group that receives overflow traffic and may receive

 

first-route traffic. See also trunk group.

first-choice trunk group

The group of trunks on a communications system that is chosen first for a

 

particular call. See also trunk group.

flexible assignment of

A feature that allows ports normally reserved for an application to be used

BX.25 (DCIU/PI)

for another application. In the initial implementation of data

signaling ports

communications interface unit and the switch communications/processor

 

interface (DCIU-SCI/PI) signaling ports in System 75, System 85 and

 

Generic 1 and 2, certain such ports were reserved for specific applications.

 

See also BX.25.

foreign exchange (FX)

See FX.

frame

One of several segments of an analog or digital signal that has a repetitive

 

characteristic. For example, in a time division multiplexed (TDM) system,

 

a frame is a sequence of time slots, each containing a sample from one of

 

the channels served by the multiplex system. The frame is repeated at the

 

sampling rate, and each channel occupies the same sequence position in

 

successive frames. See also D4 framing format and extended

 

superframe framing format.

front end processor (FEP)

A communications front end processor interfaces a host to a

 

telecommunications network. FEP can perform any of the following

 

functions: code translation, polling, addressing, dial-up, protocol

 

enveloping and conversion, header analysis, text editing and message

 

queuing.

full-duplex transmission

A transmission system capable of carrying signals in both directions

 

simultaneously.

FX (foreign exchange)

A central office (CO) other than the one providing local access to the

 

public network.

FX trunk

A telecommunications facility that connects a communications system to a

 

central office (CO) other than its own.

general-purpose port

On the System 85 and Generic 2, a port used for either a digital telephone

(GPP)

or a data module. The GPP uses the digital communications protocol

 

(DCP) and can be used as an appearance for either a line or a trunk.

generalized route

An enhancement to Automatic Alternate Routing/Automatic Route

selection (GRS)

Selection (AAR/ARS) that performs routing based on call attributes, such

 

as bearer capability classes (BCS), in addition to the address and facilities

 

restriction level (FRL).

glare

The simultaneous seizure of a two-way trunk by two communications

 

systems, resulting in a standoff.

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AT&T 7100 series, 7500 series, 2500 series, 7200 series, 7400 series, 7300 series manual BX.25 DCIU/PI