Instruction manual

Glossary
port
Power Failure
Transfer
power supply
module
PRI
Primary Rate
Interface
Primary system
operator
position
prime line
processor
module
protocol
public network
QCC
Queued Call
Console
See jack
See PFT.
A device that directs electricity to modules and telephones
on the communications system. One power supply module
is needed for each carrier, and an auxiliary power unit is
added if the module exceeds capacity.
(Primary Rate Interface) A standard interface that specifies
the protocol used between two or more communications
systems. PRI, as used in North America, 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.
See PRI.
The first jack on the first MLX or analog multiline station
module in the control unit, that is, the extension jack with the
lowest logical ID in the system.
An 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.
The module in the second slot of the control unit (Slot 0, to
the right of the power supply). The processor module
includes the software, memory, and intelligence that runs
the communications system.
A set of conventions governing the format and timing of
message exchanges between devices, such as an MLX
telephone and the communications system control unit.
A network that is commonly accessible for local or long-
distance calling. Also called public switched telephone
network (PSTN).
(Queued Call Console) An MLX-20L telephone used by a
system operator in Hybrid/PBX mode only. The QCC is
used to answer outside calls (directed to a system operator
position) and inside calls, extend inside and outside calls to
an extension or an outside telephone number, serve as a
message center, make outside calls for users with outward
calling restrictions, set up conference calls, and monitor
system operation.
See QCC.
GL-18 Glossary