AT&T 3.0 Frame Framing format frequency generator, Frl, General-Purpose Adap See GPA Glare, Gpa

Glossary

frame

framing format frequency generator

FRL

FX

One of several segments of an analog or digital signal that has a repetitive characteristic. For example, a DS1 frame consists of a framing bit and 24 bytes, which equals 193 bits.

Pattern of frames used in transmissions.

See ring generator.

(Facility Restriction Level) ARS calling restriction type that restricts outgoing calls to certain specified routes.

(foreign exchange) Central office (CO) other than the one that is providing local access to the public telephone network.

G

General-Purpose Adap See GPA.

glare	Condition that occurs when a user tries to call out on a
	loop-starttrunk at the same time that another call arrives
	on the same trunk.
GPA	(General-Purpose Adapter) Device that connects an
	analog multiline telephone to optional equipment such as
	an answering machine or a fax machine.
ground-start trunk	Trunk on which the communications system, after verifying
	that the trunk is idle (no ground on tip lead), transmits a
	request for service (puts ground on ring lead) to the
	telephone company central office (CO).

Group IV (G4) fax mach A fax unit, offering 400 by 100 dots per inch (DPI) in fine mode, that can operate at any speed for communication with a Group Ill (G3) fax machine or another Group IV (G4) fax machine.

GL–16Maintenance and Troubleshooting