connector
A mechanical or optical device that provides a demountable connection between two fibers or a
fiber and a source or detector.
connector variation
The maximum value in dB of the difference in insertion loss between mating optical connectors
(for example, with re-mating and temperature cycling). Also called optical connector variation.
control network (CN)
The portion of the network that carries control and management traffic (for example,
communications between the NEs and between the NEs and the EMS). The control network does
not carry user traffic. The control communications use the SNMP protocol.
core
The central portion of the fiber that transmits light. It is composed of material with a higher index
of refraction than the cladding.
coupler
An optical device that combines or splits power from optical fibers.
coupling ratio/loss (CR)
The ratio/loss of optical power from one output port to the total output power, expressed as a
percentage.
CPE
See “customer premises equipment” (p. GL-6) for definition.
CR
See “coupling ratio/loss” (p. GL-6) for definition.
craft interface terminal (CIT)
A local interface between humans and a NE. It is used to issue commands to the local system or,
by way of a remote login, to another system on the same fiber as the local system.
customer premises equipment (CPE)
Terminal and associated equipment and inside wiring located at a subscriber's premises. The
equipment is connected with the carrier's communication network at the demarcation point.
CWDM
See “coarse wavelength division multiplexing” (p. GL-5) for definition.
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D data communication network (DCN)
DCN supports communications between network elements (NEs) and the network management
system (NMS).
DCM
See “dispersion compensation module” (p. GL-7) for definition.
Glossary
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GL-6
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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