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Glossary
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Operations Interface
Any interface that provides information on the system performance or control. These include the
equipment LEDs, SYSCTL faceplate, and office alarms.
OS - Operations System
A central computer-based system used to provide operations, administration, and maintenance
functions.
OSI - Open Systems Interconnection
Referring to the OSI reference model, a logical structure for network operations standardized by the
Internation Standards Organization (ISO).
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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/E3, OC-3, and
OC-12. 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
Alcatel-Lucent 1850 TSS-5, a protection line is a pair of fibers that terminate an OLIU circuit pack
in the Main-2 or C-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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365-372-403R5.1
Issue 1 November 2008
Terms and Definitions
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