Allied Telesyn International Corp AT-810SL User Manual download pdf (Page 39)

Appendix B

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 of the network.

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 RJ-45 connectors and

sometimes 50-pin Telco connectors to a patch panel and runs at 10 MHz.

100Base-TX—Originally a Grand Junction Networks proposal for 100 Mbps Ethernet

using 2 pairs of Category 5 wire and CSMA/CD, it has been standardized by the IEEE as

802.3u.

50-PIN TELCO (RJ21)—This connector is very common in 10Base-T wiring. As

opposed to the RJ-45 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 RJ-45 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.

BAYONET NUT COUPLE (BNC) CONNECTOR—A 10Base2 thin coax connector

with push-on BNC locking lug that quickly locks into place with a half twist.

BIT RATE (BR)—The rate of data throughput on the medium in bits per second.

Ethernet specifies 10 million bits per second.

BIT TIME—The duration of one bit symbol (1/BR). Ethernet specifies a bit time of 100

ns.

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Allied Telesyn International Corp AT-810SL User Manual Page 39