AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 868

Glossary
power supply
module
PRI
primary system
operator position
prime line
processor module
programming port
reassignment
protocol
public network
Q
QCC
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 the
module exceeds capacity.
(Primary Rate Interface) Standard interface that specifies
the protocol used between two or more communications
systems. As used in North America, 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 ). 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.
Set of conventions governing the format and timing of
message exchanges between devices, such as an MLX
telephone and the control unit.
Network that is commonly accessible for local or long-
distance calling. Also called "public switched telephone
network."
(Queued Call Console) MLX-20L telephone used by a
system operator in Hybrid/PBX mode only. Used to answer
outside calls (directed to a system operator position) and
inside calls, direct 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.
GL–21
System Programming