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data packet
See packet.
Ethernet
A LAN developed by Xerox Corp., Digital Equipment Corp., and Intel Corp. It uses the
CSMA/CD method of access and transmits at 10 Mbit/s on a bus topology. The IEEE
802.3 standard evolved from Ethernet, but they are not exactly the same. Network
devices based on both standards can co-exist on the same medium, but they cannot
exchange data directly without special, "bi-lingual", software that can decode packets of
both types.
extended LAN
A network consisting of two or more LANs that are connected by bridges, routers, or
other similar devices. Resources on the LANs can be accessed by users on any of the
LANs. See also LAN.
fiber-optic cable
Communication cable made with a core of glass or other light-transmitting filaments. It
uses a signal-encoded light beam, and depends on internal reflection for transmission.
Because it does not use electrical or magnetic flux, it is unaffected by environmental
conditions like lightning.
fiber-optic transceiver
A transceiver that connects a node's AUI port to a fiber-optic cable.
50-ohm terminator
A connector containing a 50-ohm resistor used to terminate the end of an IEEE 802.3
LAN coaxial cable segment. One is required on each end of the segment.
filtering
The process by which the bridge discards packets based on its configuration (operating
state, address table, and wildcard filters). See also address filtering.
Glossary-3
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