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Terms and definitions
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OC-12
Optical Carrier Level 12 Signal (622 Mb/s).
OC-12c (STS-12c)
Optical Carrier Level 12 Concatenated Signal. High-speed broadband equivalent to twelve STS-1s
linked together with a single path overhead.
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.
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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.
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GL - 2 4
365-372-603R2.0
Issue 1 January 2009
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