Alcatel-Lucent 1643 AMS Operation Manual page 370

Glossary
Platform
Family of equipment and software configurations that are designed to support a
particular Application.
Plesiochronous Network
A network that contains multiple subnetworks, each of which is internally synchronous
and operates at the same nominal frequency, but the timing of any of the subnetworks
may be slightly different at any particular instant.
PLL
Phase Lock Loop
PM
Performance Monitoring - Measures the quality of service and identifies degrading or
marginally operating systems (before an alarm is generated).
PMA
Performance Monitoring Application
Pointer
An indicator whose value defines the frame offset of a virtual container with respect to
the frame reference of the transport entity on which the Virtual Container is supported.
POTS
Plain Old Telephone Service
PP
Pointer Processing
PPC
Pointer Processor and Cross-connect
PRI
Primary Rate Interface
Primary ITM-SC
ITM-SC that is usually managing a network element. If the primary ITM-SC fails,
management of the network element is passed over to the secondary ITM-SC. A network
element should be provisioned normally on the primary ITM-SC and then be configured
for use on the secondary ITM-SC. See also Geographic Redundancy.
Primary Reference Clock (PRC)
The main timing clock reference in SDH equipment.
Protected Domain
The protected domain for an ITM-SC contains all the network elements for which this
manager is the primary ITM-SC and which are protected by another secondary ITM-SC.
See also Geographic Redundancy.
Protecting Domain
The protecting domain for an ITM-SC contains all the network elements for which this
manager is the secondary ITM-SC. See also Geographic Redundancy.
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Issue 4, May 2007