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402 Chapter 6 • Infrastructure Security: Devices and Media

Figure 6.16 Sample Coax Segment

Ethernet
Barrel
Terminator T-Connector Terminator
Connector w/ Ground

Thick Coax
Thicknet (thick coax) cabling is about twice as thick in diameter as thinnet and is
much stiffer and more difficult to work with.This is an older style of cabling (type
RG-8) that is generally used with IBM hardware.Attaching computers to thicknet
cable segments is done by using a vampire tap to cut through the plastic sheath and
make contact with the wires within.A transceiver with a 15-pin adapter unit inter-
face (AUI) is connected to the vampire tap and the NIC is attached to the
transceiver with a transceiver cable.Thicknet cables are similar to thinnet cables in
that they require a 50-ohm terminator on both ends of the segment with one end
grounded. Figure 6.17 shows a sample network using thicknet.

Figure 6.17 Example Thicknet Network Diagram

Vampire Tap
Ethernet

15-Pin AUI
Terminator Terminator
Connector w/ Ground

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