Instruction manual

Glossary
PFT
(Power Failure Transfer) 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 extension jacks.
pool
In
Hybrid/PBX mode , a group of outside trunks that
users can access with a PoolPool 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.
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-
channel
s 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.
processor module
Module in the second slot of the control unit
(Slot 0,
to the right of the
power supply module ). Includes
the software and memory that runs the system.
programming port
reassignment
Reassignment of the system programming jack
position to any of the first five extension jacks on
the first MLX module in the control unit.
System Manager's Guide
GL–17