A fiber cross-connect that operates without optical-electrical-optical conversion. It can have one
or more wavelengths on each fiber or port.
photonic protection switch (PPS)
By provisioning of PPS cards (or optical splitters), automatic protection switch (APS) are
automatically created.
physical coding sublayer (PCS)
PCS layer monitoring used for Ethernet/FC ports.
PM
See “performance monitoring” (p. GL-21) for definition.
PMD
See “polarization mode dispersion” (p. GL-22) for definition.
point-to-point transmission
The transmission between two designated stations.
polarization dependent loss (PDL)
Loss of optical power that occurs during the polarization process. Polarized light waves are light
waves in which the vibrations occur in a single plane. The process of transforming unpolarized
light into polarized light is known as polarization (the orientation of the electric and magnetic
field vectors of a propagating electro-magnetic wave).
polarization mode dispersion (PMD)
PMD is an inherent property of all optical media. It is caused by the difference in the propagation
velocities of light in the orthogonal principal polarization states of the transmission medium. The
net effect is that if an optical pulse contains both polarization components, then the different
polarization components will travel at different speeds and arrive at different times, smearing the
received optical signal.
PPS
See “photonic protection switch” (p. GL-22) for definition.
protocol data unit (PDU)
A device used for the information exchange between equal protocol layers.
provisioning
Placing and configuring hardware and software required to activate a telecommunications service
for a customer. If the equipment is in place, provisioning may consist of creating or modifying a
customer record in a database to activate the services.
PXC
See “photonic cross-connect” (p. GL-21) for definition.
Glossary
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GL-22
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
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