Appendix D Glossary - Allied Telesis CentreCOM AT-3606F Installation Manual

Appendix D
Glossary
10BASE2—Also called thin Ethernet, thinnet or CheaperNet, a 10 MHz baseband
specification. Cable impedance is 50
185 meters (607 ft.).
10BASE5—Also called thick Ethernet, a 10 MHz baseband specification. Cable
impedance is 50 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 of 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.
As opposed to 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.
and maximum coaxial segment length is
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