AT&T MERLIN LEGEND Release 3.1 System Manager's Manual page 404

Glossary
PFT
pool
port
Power Failure Transfer
power supply module
PRI
primary system operator
position
prime line
processor module
programming port
reassignment
(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.
In Hybrid/PBX mode , a group of outside trunks that
users can access with a Pool
an access code on an SA button . Also used by the
ARS feature when choosing the least expensive
route for a call.
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.
See PFT .
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.
(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.
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.
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.
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.
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
Pool button or by dialing
GL–17