Copper Distributed Data Interface (CDDI)
A version of FDDI that uses copper wire media instead of fiber-optic cable and operates at 100Mbps. See also twisted-pair physical media dependent (TP-PMD).
core
The central part of a single optical fiber in which the light signal is transmitted. Common core sizes are 8.3 microns, 50 microns, and 62.5 microns. The core is surrounded by a cladding that has a higher refractive index that keeps the light inside the core.
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