orderwire
A section of the supervisory signal that is used for communication between sites.
OSC
See “optical supervisory channel” (p. GL-20) for definition.
OSHA
See “Occupational Safety and Health Administration)” (p. GL-18) for definition.
OSI
See “Open Systems Interconnection reference model” (p. GL-19) for definition.
OSNR
See “optical signal to noise ratio” (p. GL-20) for definition.
OSP
See “outside plant” (p. GL-21) for definition.
OSS
See “Operations Support System” (p. GL-19) for definition.
OT
See “optical transponder” (p. GL-20) for definition.
OTN
See “optical transport network” (p. GL-20) for definition.
out of frame (OOF)
A state in which the frame alignment sequence of an SDH/SONET frame has not been found for
several consecutive frames.
outside plant (OSP)
Refers to outside the central office/building premises.
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P PCS
See “physical coding sublayer” (p. GL-22) for definition.
PDL
See “polarization dependent loss” (p. GL-22) for definition.
PDU
See “protocol data unit” (p. GL-22) for definition.
performance monitoring (PM)
Measures the quality of service and identifies any degrading or marginally operating systems
(before an alarm would be generated).
photonic cross-connect (PXC)
Glossary
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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
GL-21
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