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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-21
peripheral system In a
private network
, a system that does not connect to
more than one other system, sometimes called an “end
node.”
personal line Central office line/trunk that terminates directly at one or
more extensions. In
Hybrid/PBX mode
, a personal line
cannot be part of a line/trunk
pool
. Also called “DFT” (direct
facility termination).
PFT (Power Failure Transfer) Feature that provides continuity
of telephone service during a commercial power failure by
switching some of the system’s line/trunk connections to
telephones connected to specially designated extension
jacks.
phantom
extension
An extension that is not actually plugged into the system
but is used, for example, as a calling group member
covered by a
voice messaging system
.
pool In
Hybrid/PBX mode
, a group of outside lines/trunks that
users can access with a Pool button or by dialing an
access code on an
SA button
. Also used by the
ARS
feature when choosing the least expensive route for a call.
point-to-point
facility
In a
private network,
a line/trunk that passes through the
PSTN
without using the switching capabilities of the PSTN.
port See
jack
. Also, refers to
extension
or
line/trunk jacks
before
these are numbered according to the
dial plan
during
programming. The lowest jack on a module is always
Port 1.
Power Failure
Transfer
See
PFT
.
power supply
module
Device that directs electricity to
modules and telephones on
the system. One power supply module is needed for each
carrier, and an
auxiliary power unit
is added if needed.
PRI (Primary Rate Interface) Standard interface that specifies
the protocol used between two or more communications
systems. As used in North America, it provides twenty-
three 64-kbps
B-channels
for voice and/or data and one 16-
kbps
D-channel
, which carries multiplexed signaling
information for the other 23 channels.
primary system
operator position
First jack on the first MLX or analog multiline extension
module in the control unit, that is, the extension jack with
the lowest logical ID in the system.
prime line Individual extension number assigned to a telephone in a
system operating in
Behind Switch mode
. Each telephone
user has his or her own prime line and is automatically
connected to that line when he or she lifts the handset.
private
communications
network or private
network
An interconnected group of
communications systems
,
which may consist of MERLIN LEGEND Communications
Systems, DEFINITY Enterprise Communications Servers
(ECS), and/or DEFINITY ProLogix Solutions.