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Glossary
frame
framing format
frequency generator
FRL
FX
G
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.
General-Purpose Adap
See GPA.
glare
Condition that occurs when a user tries to call out on a
loop-start trunk 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–16 Maintenance and Troubleshooting