Alcatel-Lucent 1830 PSS-16 Maintenance And Trouble-Clearing User Manual page 707

Glossary
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legislation.
OCHAN or OCh
See "optical channel" (p. GL-20)
ODU
See "optical demultiplexer" (p. GL-20)
ODU-k
An optical logical connection with a specific rate. The rate can be either ODU-10G or ODU-40G.
OEO
See "optical-electrical-optical conversion" (p. GL-20)
OOF
See "out of frame" (p. GL-21)
Open Systems Interconnection reference model (OSI)
A seven-layer model that pertains to the logical structure for communications networks
standardized by the International Organization for Standardization (ISO). Adherence to the
standard enables any OSI-compliant system to communicate with any other OSI-compliant
system.
Operations Support System (OSS)
A management system supporting a specific management function, such as alarm surveillance or
provisioning, in a carrier network. Many OSSs are large centralized systems running on
mainframes or minicomputers.
OPR
See "OPR" (p. 2-228)
OPS
See "optical protection switch" (p. GL-20)
optical add/drop multiplexer (OADM)
An OADM is a network element which allows a WDM transmission link to add or drop optical
signals, without converting the photonic stream into an electrical signal. Insertion and extraction
are done using optical filters or demultiplexers. An OADM can be either non-reconfigurable or
reconfigurable; in the latter case, optical switches need to be used.
optical amplifier (OA)
A device that amplifies an input optical signal without converting it into electrical form.
optical carrier level-n (OC-n)
A carrier rate specified in the SONET standard, where n is a numeric.
optical cell
A number of nodes connected by fiber in a predefined manner to provide route diversity to each
node. The simplest form of optical cell is a ring. Statically allocated wavelengths are assigned
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
for definition.
for definition.
for definition.
for definition.
for definition.
for definition.
GL-19