Performance Monitoring (PM)
Measures the quality of service and identifies degrading or marginally operating systems (before
an alarm would be generated).
PID
Program Identification
PJC
Pointer Justification Count
Plesiochronous Network
A network that contains multiple maintenance subnetworks, each internally synchronous and all
operating at the same nominal frequency, but whose timing may be slightly different at any
particular instant. For example, in SONET networks, each timing traceable to their own Stratum
1 clock are considered plesiochronous with respect to each other
PLL
Phase-Locked Loop
PM
Performance Monitoring
POP
Points of Presence
Port (also called Line)
The physical interface, consisting of both an input and output, where an electrical or optical
transmission interface is connected to the system and may be used to carry traffic between
network elements. The words
″
port
″
and
″
line
″
may often be used synonymously.
″
Port
″
emphasizes the physical interface, and
″
line
″
emphasizes the interconnection. Either may be
used to identify the signal being carried.
Port Protection Group
A user provisioned association of protected optical interface ports. This association is used for
line protection. The group of ports represent both a protection switching entity and also a set of
lines that carry services to/from another network element. The port protection groups also
determine the set of logical tributaries from and to which cross-connections can be provisioned.
Port State Provisioning
A feature that allows a user to supress alarm reporting and performance monitoring during
provisioning by supporting multiple states (automatic, in-service, and not monitored) for
low-speed ports. See Channel State Provisioning.
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G L O S S A R Y
G L - 2 0
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005