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Appendix D
Glossary
10BASE2—Also called thin Ethernet, thinnet or CheaperNet, a 10 MHz
baseband specification. Cable impedance is 50
Ω
and maximum coaxial
segment length is 185 meters (607 ft.).
10BASE5—Also called thick Ethernet, a 10 MHz baseband specification. Cable
impedance is 50
Ω
and maximum coaxial segment is 500 meters (1,640 ft.). The
cable is commonly referred to as yellow cable. Thick Ethernet cable is typically
used as a trunk or backbone path for the network.
10BASE-FL—IEEE 802.3 Fiber Optic Ethernet. A fiber optic standard that
allows up to 2,000 meters (6,560 ft.) of multimode duplex fiber optic cable in a
point-to-point link.
10BASE-T—IEEE 802.3 UTP Ethernet. Low-cost Level 3 or better UTP wiring
affords 100 meters (328 ft.) of point-to-point link segments. UTP uses RJ45
connectors and sometimes 50-pin Telco connectors to a patch panel and runs at
10 MHz.
50-PIN TELCO (RJ21)—This connector is very common in 10BASE-T wiring.
Unlike the RJ45 connector, the 50-pin Telco connector concentrates up to 12
UTP connections onto one connection. This concentration of UTP ports is then
broken out for connection to a punch-down block inside a building’s wiring
closet. 50-pin Telco connections provide a very clean, uncluttered interface to
the building’s wiring.
AT-ADAPT-2— A harmonica-style adapter that allows direct conversion from
a 50-pin Telco connector to RJ45 receptacles.
ATTACHMENT UNIT INTERFACE (AUI)—Connection between a MAU
(transceiver) and a DTE (typically a workstation). Includes a 15-pin D-sub
connector and sometimes a 15-conductor twisted pair cable. Maximum length
is 50 meters (164 ft.).
BACKUP MODULE— A repeater that behaves as the management module
when the Master fails in a department concentrator.
BASEBAND COAXIAL SYSTEM—A system whereby information is directly
encoded and impressed on the coaxial transmission medium. At any point on
the medium, only one information signal at a time can be present without
disruption.
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