Allied Telesis CentreCOM AT-3675 Bridge User Manual page 29

CentreCOM AT-3675 SNMP-Managable Learning Bridge
DATA COMMUNICATION EQUIPMENT (DCE)—In RS232
specification a unit, such as a modem, for connecting a DTE to other
equipment. A repeater connected to a terminal or workstation for OMEGA
LOCAL management use is wired as a DCE.
DATA TERMINAL EQUIPMENT (DTE)—In RS232 specification a unit
typically at the end of a segment. The DTE could be an Ethernet workstation,
repeater or bridge.
DEPARTMENT CONCENTRATOR—Hub which provides a large
number of workstation connections. The term, department concentrator,
refers to multiple repeaters housed in an Allied Telesis chassis. See Hub/
Repeater, Repeater.
DIX CONNECTOR—See D-Sub Connector
FOIRL — A fiber optic standard that allows up to 1,000 meters (3,280 ft.) of
multimode duplex fiber optic cable in a point-to-point link.
HARMONICA ADAPTER—This adapter provides a simple way to convert
the 50-pin Telco connection to RJ45 connections.
HEARTBEAT—See SQE
HOT SWAPPING— The process of replacing a hub module without
bringing down the network. This process occurs by sliding an active module
into a fully powered up concentrator, replacing a failed module.
HUB to HUB WIRING—See Hub to MAU Wiring
HUB to MAU WIRING—UTP cables for 10BASE-T hub-to-MAU or
Network Interface Controller (NIC) cards are wired straight-through. An
RJ45 receptacle at the hub would wire pin to pin to the RJ45 receptacle at the
MAU.
HUB/REPEATER—A hub is a central signal distributor. It is used in a
wiring topology consisting of several point-to-point segments originating
from a central point. The term hub is often used interchangeably with the
term repeater. Multiport 10BASE-T, 10BASE2 and fiber optic (10BASE-FL,
FOIRL) repeaters are considered hubs. In this manual, the term hub is used
generic, in discussions of software which does not distinguish between
standalone repeaters and department concentrators. See Repeater.
HOUSE WIRING—House wiring is the existing wiring inside a building.
This wiring generally originates from one or more wiring closets such as a
telephone room. Some older buildings may have wiring unsuitable for 10
Megabit data rates. In these circumstances, it is recommended that the
wiring is tested with a 10BASE-T signal/wire tester.
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.
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