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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
Glossary
Page GL-20
O
P
non-satellite
system
In a
private network,
a
communications system
that is
directly connected to and located more than 200 miles from
the local system.
off-hook Telephone is said to be off-hook when the user has lifted
the handset, pressed the Speakerphone button to turn on
the speakerphone, or used a headset to connect to the
communications system or the telephone network.
off-premises
telephone
See
OPT
.
ones density Requirement for channelized
DS1
service to the public
network that eight consecutive zeros cannot occur in a
digital data stream.
on-hook Telephone is said to be on-hook when the handset is hung
up, the speakerphone is turned off, and the user is not
using a headset to connect to the communications system
or the telephone network.
OPT (off-premises telephone)
Single-line telephone
or other
tip/ring
device connected to the system via a 008 OPT
module in the control unit. Appears as an inside extension
to the system, but may be physically located away from the
system.
OPX (off-premises extension)
out-of-band
signaling
Signaling that uses the same path as voice-frequency
transmission and in which the signaling is outside the band
used for voice frequencies.
parity 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.
PassageWay
Direct Connection
Solution
Set of software applications that provides an interface
between a personal computer and an MLX telephone.
PBX (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.
PC personal computer
PCMCIA memory
card
(Personal Computer Memory Card International
Association memory card) See
memory card
.