Appendix B Glossary - Allied Telesis CentreCOM AT-3675 Bridge User Manual

Appendix B
Glossary
10BASE2 —Also called thinnet Ethernet, thinnet or CheaperNet, 10BASE2
is a 10 MHz, baseband, 185 meters (607 ft.) maximum coaxial segment. Cable
impedance is 50 .
10BASE5—Also called thick Ethernet, 10BASE5 is a 10 MHz, baseband, 500
meters (1,640 ft.) maximum coaxial segment. The cable is commonly referred
to as yellow cable. Cable impedance is 50 . 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. Using low cost Level 3 or better
UTP wiring, 100 meters (328 ft.) of point-to-point link segments are possible.
Uses RJ45 connectors and sometimes 50-pin AMP connectors to a patch
panel. 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)—This is the cable connection
from a MAU (transceiver) to a DTE (typically a workstation) consisting of a
15-conductor twisted pair cable of 50 meters (164 ft.) maximum length.
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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