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Glossary
Terms and Definitions
G L - 2 6
Lucent Technologies - Proprietary
See notice on first page
365-372-327 R2.0
Issue 1, October 2003
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OC-48
Optical Carrier Level 48 Signal.
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).
OSGNE - Operations System Gateway Network Element
An OSGNE serves as a single interface to the OS for NEs in the same
subnetwork using X.25 interfaces.
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 Provision-
ing.
