Lucent Technologies 555-661-150 manual Pri

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150	August 1998
Glossary
	Page GL-22
power supply	Device that directs electricity to modules and telephones on
module	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-channelsfor voice and/or data and one 16-
	kbps D-channel, which carries multiplexed signaling
	information for the other 23 channels.
primary system	First jack on the first MLX or analog multiline extension
operator position	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.
private	An interconnected group of communications systems,
communications	which may consist of MERLIN LEGEND Communications
network or private	Systems, DEFINITY Enterprise Communications Servers
network	(ECS), and/or DEFINITY ProLogix Solutions.
private network	The facilities that connect communications systems in a
trunks	private network. See also tandem tie trunks and tandem
	PRI trunks.
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 of the system programming jack position to
reassignment	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.
PSTN	Network that is commonly accessible for local or long-
	distance calling. Also called “public network” or “public
	switched network.”
PSTN trunk	In a private network, a facility that connects a networked
	system to the public switched telephone network.
public switched	See PSTN.
telephone network