Instruction manual

MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Glossary
Page GL--15
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.
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.
protocol Set of conventions governing the format and timing of
message exchanges between devices, such as an MLX
telephone and the control unit.
public network Network that is commonly accessible for local or
long-distance calling. Also called “public switched
telephone network” or “public switched network.”