Black Box LZ1500A-R3, Руководство пользователя

Страница: 38 / 39

35
UTP AND THIN ETHERNET REPEATERS
Retiming Repeater —A repeater that reclocks an electrical signal and
amplifies the signal for retransmission.
Router —A device that connects two networks of different protocols
together and maintains addressing information for each network.
Workstations can pass information from one network to another by
sending the information through the router.
Segment —Any section of cable that is attached to a port of a repeater,
bridge, or router.
Server —A computer, workstation, or similar device that provides service(s)
to network users or other devices on the network. The three most
common types of servers on local area networks are the print server, file
server, and electronic mail server.
Shielded Cable —A wire or circuit enclosed by a grounded metallic
material. Shielding serves two purposes. First, it keeps outside electrical
disturbances from reaching the wire and disrupting the signals passing
over it. Second, shielding keeps the cable from emitting radiation that can
disrupt radio and television reception, or that can be captured and
interpreted by some unauthorized person.
Star Topology
—A centralized network with a hub, concentrator, or star
controller in the center and all the nodes connected to it. The hub
controls access and transmission along all of the connecting lines. Star
networks are simple to control because all control takes place at one point.
10BASE5 —The original Ethernet medium, an implementation of the
Ethernet IEEE standard on twinaxial cable, a baseband medium, at 10
megabits per second. The maximum segment length is 500 meters (1640
feet).
10BASE-T —An implementation of the Ethernet IEEE standard on data
grade unshielded twisted pair wiring, a baseband medium, at 10 megabits
per second.
10BASE2 —An implementation of the Ethernet IEEE standard on thin
coaxial cable, a baseband medium at 10 megabits per second. The
maximum segment length is just under 200 meters (656 feet).
Terminator —A device attached to the end of a cable to prevent unwanted
signals on the line or link. A terminator matches the characteristic
impedance of the line, so that signals arriving at the end of the cable do
not find an impedance discontinuity and are thus not reflected.
Thick Ethernet Cable —A large, 50-ohm coaxial cable, typically bright
yellow in color. Thick Ethernet cable can be purchased in various pre-cut