Glossary 125
Crossover Cable
A type of twisted-pair cable in which the wires at
one end have been reversed in order to match
pinouts on a hub or switch.
CSMA/CD
Carrier Sense Multiple Access with Collision De-
tection; a network communications protocol in
which each transmission source (i.e., station,
server, switch, etc.) monitors the main data chan-
nel for traffic before and during transmission,
postponing transmission when the data channel is
in use.
D
Duplex (full & half)
The transmission of data over a network in both
directions. Full-Duplex (FDX) is simultaneous
transmission of data over a network channel in
both directions. Half-Duplex (HDX) is transmis-
sion in both directions but one at a time, not
simultaneous.
E
Ethernet
A particular type of LAN described in a standard
(802.3) established by the IEEE, with 10Mbps
data transmission.
F
Fast Ethernet
An extension of Ethernet LAN (defined in stan-
dard 802.3u) to allow 100Mbps transmissions.
H
Hub
The central device in a star-topology LAN used to
connect each station to the network.
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