Hardware Reference
In-Depth Information
Figure 17.6
Coaxial cable.
Twisted-Pair Cable
Twisted-paircableisjustwhatitsnameimplies:insulatedwireswithinaprotectivecasing
with a specified number of twists per foot. Twisting the wires reduces the effect of elec-
tromagnetic interference (EMI, which can be generated by nearby cables, electric motors,
and fluorescent lighting) on the signals being transmitted. Shielded twisted pair (STP)
referstotheamountofinsulationaroundtheclusterofwiresandthereforeitsimmunityto
noise.Youareprobablyfamiliar withunshieldedtwistedpair(UTP)cable;itisoftenused
for telephone wiring.
Figure 17.7
shows UTP cable;
Figure 17.8
illustrates STP cable.
Figure 17.7
A UTP cable.
