AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 860

Glossary
FX
G
General-Purpose
Adapter
glare
GPA
ground-start trunk
Group IV (G4) fax
machine
H
Hands Free Answer
on Intercom
hands-free unit
headset
HFAI
HFU
(Foreign exchange) Central office ( CO ) other than the one
that is providing local access to the public telephone
network.
See GPA .
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.
(General-Purpose Adapter) Device that connects an
analog multiline telephone to optional equipment such as
an answering machine or a fax machine.
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 ).
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 III (G3) fax machine or another Group IV (G4)
fax machine.
See HFAI .
See HFU .
Lightweight earpiece and microphone used for hands-free
telephone operation.
(Hands Free Answer on Intercom) Feature that allows a
user to answer a voice-announced call.
(Hands-Free Unit) Unit for analog multiline telephones that
allows users to make and receive calls on the
speakerphone without using the handset.
GL–13
System Programming