Digital Equipment DECconcentrator 500, Руководство по установке, Страница: 87 / 98

Glossary–1
Glossary
American National Standards Institute (ANSI)
An organization that compiles and publishes computer industry standards.
ANSI
See American National Standards Institute.
attenuation
Magnitude of optical power loss usually expressed in units of decibels (dB).
bypass
The ability of a station to be optically or electronically isolated from the network
while maintaining the integrity of the ring.
cable
As used in this manual, the physical medium for transmitting signals; includes cop-
per and optical fiber.
concentrator
An FDDI node that provides additional attachment points for stations that are not
part of the dual ring, or for other concentrators in a tree structure. A concentrator has
two Physical Layer entities and may have one or more Data Link layer entities. The
concentrator is the focal point of Digital’s dual ring of trees topology.
configuration switch
The switches located on the Network Management Card handle. Switch 1 is used to
enable/disable the reset to default parameters function status (only active during ini-
tialization). Switch 2 is used to enable/disable remote write access (always active).
counter-rotating ring
An arrangement where two signal paths, with opposite directions, exist in a ring to-
pology.