OOS
Out Of Service
Operations System (OS)
The Operations System is the system that provides operations, administration and
maintenance functions.
Operator
A user of the NMS application with Operator privileges. See also User Privilege.
Optical Line System (OLS)
A high-capacity lightwave system that is designed to multiplex eight optical signals with
different wavelengths into one combined signal through an optical fiber. There is a
difference of 1.5 micrometer in wavelength between two multiplexed signals.
OS
Operations System - A central computer-based system that is used to provide operations,
administration and maintenance functions.
OSB
Optical Splice Box
OSI
Open Systems Interconnection
OW
(Engineering) Order Wire
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P
PABX
Private Automatic Branch eXchange
Paddle Board - Peripheral Control and Timing link (PB-PCT)
A small circuit board used in a 5ESS exchange for protection switching and optical to
electrical conversion of the PCT-link.
Path
A logical connection between one termination point at which a standard format for a
signal at the given rate is assembled and from which the signal is transmitted, and
another termination point at which the received standard frame format for the signal is
disassembled.
Path AIS
Path Alarm Indication Signal - A path-level code that is sent downstream in a digital
network as an indication that an upstream failure has been detected and alarmed.
Path Overhead (POH)
The Virtual-Container Path Overhead provides integrity of communication between the
point of assembly of a Virtual Container and its point of disassembly.
Glossary
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GL-20
Lucent Technologies - Proprietary
See notice on first page
365-312-847R4.0
Issue 4, November 2006