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G
LOSSARY
83
torque
The amount of force exerted to tighten a screw, bolt,
or nut.
traces
Links that are star-wired to the slot with the switch
fabric module, providing primary high-speed links for
each interface module.
trunk
Physical and logical connection between two switches
across which network traffic travels.
twisted pair
Two insulated wires that are wrapped around each
other for protection against interference. Each wire is
insulated, and the pair is usually covered by an overall
casing. This type of wiring is generally used for
connecting 10BASE-T, 100BASE-T, and FDDI systems.
UART
Universal asynchronous receiver/transmitter. A chip
that is used as communications (COM) port in
personal computers. It combines the transmitting and
receiving circuitry needed for asynchronous
communications over a serial line.
UTP
Unshielded Twisted Pair. Common, phone-grade,
twisted pair wiring that is not provided with a
protective shielding against outside interference.
WAN
Wide Area Network. A data communications network
that spans very large geographical areas.
VLAN
Virtual LAN. A logical association that allows users to
communicate as if they were physically connected to
a single LAN, independent of the actual physical
configuration of the network.
warm swapping
A feature that allows you to remove and replace a
power supply in the Switch 4007 chassis when the
Standby/On switch is in the Standby position, without
disconnecting the AC input power cord.
wiring closet
A central area that is used for wiring networking
systems and telephone communication systems.