Alcatel-Lucent 1830 PSS-16 Maintenance And Trouble-Clearing User Manual page 708

Glossary
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within the context of one cell.
optical channel (OCHAN, Och)
An optical wavelength band for WDM optical communications.
optical demultiplexer (ODU)
Value/indicator used for an optical demultiplexer.
optical path protection (OPP)
A protection path is defined when the connection is set up. When a fault is detected on the path,
there is a switch-over from the working path to the protection path to restore the traffic.
optical path restoration (OPR)
A recovery scheme that dynamically finds a protection path when a fault is detected. This method
is usually not capable of matching SDH/SONET recovery time periods (for example, 50 ms).
optical power meter
An instrument that measures the amount of optical power present at the end of a fiber or cable.
optical protection switch (OPS)
An optical circuit pack that provides WDM protection.
optical signal to noise ratio (OSNR)
The ratio between the optical signal power of the data signal and the power of the optical noise
signal.
optical supervisory channel (OSC)
A designated optical channel used to carry communications related to maintenance and
operational functions of the network rather than customer traffic.
The OSC supports the following communications: node-to-node, interworking, client LAN, and
orderwire communication.
optical transponder (OT)
An OT is a circuit pack that performs optical-to-electrical to optical (OEO) conversion.
OTs perform frequency adaptation between 1830 PSS equipment and external equipment that is
not optically compatible with 1830 PSS Transport. OTs also provide 3R functionality (retiming,
reshaping, reamplification) and perform fault management and performance monitoring
(non-intrusive monitoring) on the SONET/SDH and WaveWrapper signal.
optical transport network (OTN)
A fiber-optic network designed to transport customer traffic, such as an SDH or SONET network.
See "Synchronous Digital Hierarchy" (p. GL-28)
(p. GL-28)
optical-electrical-optical conversion (OEO)
The process of converting an optical signal to an electrical equivalent and then back to optical
data.
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GL-20
for examples.
and "Synchronous Optical Network"
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011