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Glossary
Numbers
10Base-T Shorthand name for an Ethernet physical layer specification that
uses
unshielded twisted-pair (UTP) cables in a star topology. The “10” refers to
the net-
work’s speed of 10 Mbps, the “base” refers to the network’s baseband
transmis-
sions, and the “T” refers to the use of twisted-pair cable. The maximum
cable
segment length for a 10Base-T network is 100 meters.
100Base-FX
Shorthand name for a 100-Mbps Fast Ethernet physical layer
specification, defined in the Institute of Electrical and Electronic
Engineers (IEEE)
802.3u standard document, that uses 62.5/125 multimode fiber-optic cable in
a star
topology, with a maximum segment length of 412 meters at half duplex and
2,000
meters at full duplex.
100Base-TX
Shorthand name for a 100-Mbps Fast Ethernet physical layer
specification, defined in the Institute of Electrical and Electronic
Engineers (IEEE)
802.3u standard document, that uses Category 5 or better unshielded
twisted-pair
(UTP) cable in a star topology, with a maximum segment length of 100 meters.
100Base-TX achieves its high speed using only two pairs of the wires in the
cable
because the specification insists on the use of high-quality cable.
100Base-TX is
the most popular Fast Ethernet specification.
1000Base-LX Shorthand name for a 1000-Mbps gigabit Ethernet physical layer
specification, defined in the Institute of Electrical and Electronic
Engineers (IEEE)
802.3z standard document, that runs over either 9/125 single-mode
fiber-optic
cable, with a maximum segment length of 3 kilometers, or 50/125 or 62.5/125
multimode fiber-optic cable with a maximum segment length of 550 meters.
1000Base-SX Shorthand name for a 1000-Mbps gigabit Ethernet physical layer
specification, defined in the Institute of Electrical and Electronic
Engineers (IEEE)
802.3z standard document, that runs over 50/125 multimode fiber-optic cable
with
a maximum segment length of 500 meters or 62.5/125 multimode fiber-optic
cable
with a maximum segment length of 220 meters.
1000Base-T Shorthand name for a 1000-Mbps gigabit Ethernet network, defined
in
the Institute of Electrical and Electronic Engineers (IEEE) 802.3ab standard
document, that uses Category 5 or 5E unshielded twisted-pair (UTP) cable in
a star
topology, with a maximum segment length of 100 meters.
5-4-3 rule An Ethernet cabling guideline stating that an Ethernet local area
network
(LAN) can consist of up to five cable segments, connected by four repeaters,
with
up to three of those cable segments being mixing segments.
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