Instruction manual

Glossary
ones density
on-hook
OPT
outcalling
out-of-band
signaling
parity
pass-through
PBX
PC
Personal Line
PFT
pool
The requirement for channelized DS1 service to the public
network that eight consecutive zeroes cannot occur in a
digital data stream.
A 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.
(off-premises telephone) A single-line telephone or other
tip/ring device connected to the communications system via
an 008 OPT module in the control unit. The device appears
as an inside extension to the system, but may be physically
located away from the system.
A feature of the AUDIX Voice Power and MERLIN Mail
applications. When outcalling is activated, the subscriber is
called automatically by the system at a programmed
number when a new message is received in his or her
mailbox.
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 1’s is odd or even. Parity can be used to detect and
correct transmission errors.
A connection from an internal modem to a programming
port on the communications system.
(Private branch exchange) A local electronic telephone
switch that serves local stations (for example, extensions
within a business) and provides those stations with access
to the public network.
Personal computer.
A 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.
(Power Failure Transfer) A feature that provides continuity of
telephone service during a commercial power failure by
switching some of the system’s trunk connections to
telephones connected to specially designated station jacks.
In Hybrid/PBX mode, a grouping of outside trunks that users
can access with a Pool button or by dialing an access
code on an SA button. Pools are also used by the ARS
feature to choose the least expensive route for a call.
Glossary GL-17