Alcatel-Lucent 1665 Installation Manual page 401

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P Pass Through
Paths that are cross-connected directly across an intermediate node in a ring network.
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.
PM - Performance Monitoring
Measures the quality of service and identifies degrading or marginally operating systems (before an alarm
would be generated).
Port
The physical, electrical, or optical interface on a system. For example, DS1, DS3, EC-1, OC-3, OC-12, and
OC-48. See Channel.
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.
Proactive Maintenance
Refers to the process of detecting degrading conditions not severe enough to initiate protection switching or
alarming, but indicative of an impending signal fail or signal degrade defect (for example, performance
monitoring).
Protection Line
As defined by the SONET standard, the protection line is the pair of fibers (one transmit and one receive)
that carry the SONET APS channel (K1 and K2 bytes in the SONET line overhead). On a DMX 2.5G
Multiplexer, a protection line is a pair of fibers that terminate an OLIU circuit pack in the Main-2, A-2, B-
2, C-2, D-2, or G-2 slots. See Service Line.
Product Family 2000
Lucent's first line of SONET standard network products providing total network solutions.
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R Reactive Maintenance
Refers to decting defects/failures and clearing them.
Remote
See Far-End (FE).
Revertive
A protection switching mode in which, after a protection switch occurs, the equipment returns to the
nominal configuration (that is, the service equipment is active, and the protection equipment is standby)
after the clearing of any failure conditions that caused a protection switch to occur or after any external
switch commands are reset. See Non-Revertive.
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365-372-304R7.1
Issue 1, November 2007
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