AT&T MERLIN LEGEND Release 3.0 System Programming And Maintenance Manual page 116

Glossary
OPT
OPX
out-of-band signaling
P
parity
pass-through
PBX
PC
PCMCIA memory card
personal line
GL-26 System Programming and Maintenance (SPM)
(off-premises telephone) Single-line telephone
or other tip/ring device connected to the
system through an 008 OPT module in the
control unit. Appears as an inside extension to
the system, but may be physically located
away from the system.
off-premises extension
Signaling that uses the same path as voice-
frequency transmission and in which the
signaling is outside the band used for voice
frequencies.
The addition of a bit to a bit string so that the
total number of ones is odd or even, used to
detect and correct transmission errors.
Connection from an internal modem to a
programming jack on the system.
(private branch exchange) Local electronic
telephone switch that serves local stations (for
example, extensions within a business) and
provides them with access to the public
network.
personal computer
Personal Computer Memory Card International
Association memory card) See memory card.
Central office trunk that terminates directly on
one or more telephones. In Hybrid/PBX mode,
a personal line cannot be part of a trunk pool.
Also called "DFT" (direct facility termination).