Information Technology Reference
In-Depth Information
Thicknet grounding
Main wiring closet
Intermediate wiring closet
Wiring closet
Thicknet
trunk
cable
Cable shield
bonded to
ground.
etc.
Bonding conductor
between floors
Building ground
Thinnet grounding
Thinnet c able s egment
50W
50W
Bond to
building
ground
For best performance, thinnet is grounded only at one
end of the cable segment, not at intermediate points such
as other BNC-Ts. However, building and electrical codes
may require bonding on each floor or wiring closet. Bonding
is always recommended at any building cable entrance.
Building ground
FIGURE B.5
Typical grounding recommendations for coaxial Ethernet cabling.
connectors are designed for use at many times the frequencies of Ethernet LANs, so
their use in networks is no problem. The use of thicknet cable and the correspon-
ding Type N connector has decreased greatly with the advent of thinnet cabling and
its BNC connectors.
BNC coax connectors are smaller, less expensive connectors compared to the
Type N. BNC connectors are used with “thin Ethernet” or thinnet cable that was
introduced during the 1980s as a cheaper alternative to thicknet. The BNC connec-
tor is also used for ARCnet coax connections.
The typical measurements to prepare a coax cable for BNC termination are
shown in Fig. B.7. BNC connectors are available in two- and three-piece construc-
tions that are designed for termination using screw-on, crimp-on, or solder assembly.
The crimp-on style is the most popular for field termination of LAN cables.
The assembly process is as follows. The crimp-on sleeve (of a three-piece connector)
is placed over the end of the coax. The coax cable is stripped in the manner shown
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