ADTRAN ISU 512e Manual page 146

Glossary
EIA-366
An EIA interface standard for autodialing.
Ethernet
A local area network used for connecting computers, printers,
workstations, terminals, servers, etc., within the same building or
campus. Ethernet operates over twisted wire and coaxial cable at
speeds up to 10 Mbps. Ethernet specifies a CSMA/CD.
frame
A group of bits sent serially over a communications channel. Gen-
erally a local transmission unit sent between data-link-layer enti-
ties that contains its own control information for addressing and
error checking. The basic data transmission unit is employed with
bit-oriented protocols, similar to blocks. In video transmission, a
set of electron scan lines that comprise a television picture (usual-
ly 525 in the U.S.).
four-wire circuits
Telephone lines using two wires for transmitting and two wires
for receiving offering much higher quality than a 2-wire circuit.
All long distance circuits are 4-wire. Almost all local phone lines
and analog phones are 2-wire.
hop count
A routing metric used to measure the distance between a source
and a destination. Particularly used by RIP.
hub
(1) Communications center, (2) Major routing station for connect-
ing channels, (3) DDS connecting center.
IEEE
Institute of Electrical and Electronic Engineers. Professional orga-
nization that defines network standards. IEEE LAN standards are
the predominant LAN standards today and include protocols
similar or virtually equivalent to Ethernet and Token Ring.
IEEE 802.1d
An algorithm used to prevent bridging loops by creating a span-
ning tree.
IEEE 802.2
An IEEE LAN protocol that specifies an implementation of the
LLC sublayer of the data link layer. It handles errors, framing,
flow control, network layer (Layer 3) service interface, and is used
in LANs.
Glossary-4 ISU 512e User Manual 61203086L1-1