Glossary
9
Glossary
10BASE2
— Also called thinnet or CheaperNet, 10BASE2 is a 10 MHz, Baseband,
185 meter (606 ft.) coaxial segment. Cable impedance is 50
Ω
.
10BASE5
— Also called thick Ethernet, 10BASE5 is a 10 MHz, Baseband, 500
meter (1639 ft.) coaxial segment. The cable is also referred to as “yellow” cable.
Cable impedance is 50
Ω
. Thick Ethernet cable is typically used as a trunk or
backbone path of the network.
10BASE-T
— IEEE 802.3 UTP Ethernet. Using low cost 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.
15 PIN D-SUB CONNECTOR
— The AUI cable uses 15-pin D-connectors. D
refers to the shape of the connector shell and sub refers to the size. Also called
D-sub miniature, miniature D, DB-15, or DIX connectors. In Ethernet, a female
15-pin connector is a DTE connection and a male 15-pin connector is a transceiver
connection. Male always attaches to female; gender changing is not allowed.
ATTACHMENT UNIT INTERFACE (AUI)
— The cable connection from an
MAU (transceiver) to a DTE (typically a workstation) consisting of a 15-conductor
twisted pair cable of 50 meters (164 ft.) maximum length.
BNC SERIES
— A 10BASE2 thin coax connector with push-on bayonet locking
lug that quickly locks into place with a half twist.
COAX SEGMENT
— A segment of Ethernet cable that contains MAU.
See also Link Segment.
DATA TERMINAL EQUIPMENT (DTE)
— The MAU with an AUI cable. The
DTE could be a Ethernet workstation, host (server), repeater, bridge, router, or
gateway. DTE connections are female 15-pin connectors.
DIX CONNECTOR
— see also D-Sub Connectors
HEARTBEAT
— see also SQE Test
IMPEDANCE
— An electrical characteristic of a circuit dealing with the
combination of the AC and DC resistance and the appearance of that resistance to
attached circuits.
JABBER
— This function is the MAU’s ability to automatically inhibit the
transmit data from reaching the medium if the transmit data time length exceeds
150 ms duration. This protects the medium from being overrun with data packets
from a possibly defective device.
JITTER
— The fluctuation of the data packet in respect to a standard clock cycle.
Jitter is undesirable and must be minimized.
MR125DBook Page 9 Wednesday, August 21, 1996 4:24 PM
