Information Technology Reference
In-Depth Information
Center conductor
Braided wire
or foil shield
Dielectric insulation
Outer jacket
FIGURE A.1
Coax Cable Construction
called 10Base5. Its larger diameter gave rise to the nickname thicknet after much
smaller coax began to be used. Thicknet cables are run in the walls or above the ceil-
ing tiles near locations where workstations are planned. A transceiver mounts
directly around the coax and makes connection to the center conductor through a
hole drilled through the outer jacket, shield, and dielectric insulation. This arrange-
ment is sometimes referred to as a
vampire tap
.
Thinnet is a newer Ethernet coax cable standard, 10Base2, that allows connec-
tion to the back of the workstation adapter. The adapter, in effect, contains a built-
FIGURE A.2
The positioning of the center conductor, surrounded completely by the concentric shield con-
ductor, keeps all electromagnetic fields between the two conductors.
