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This is a 100 meter (maximum) straight-through or crossover
Category 5E Screened Twisted Pair (ScTP) cable. To prevent ground loops, build
this cable assembly with a shielded, metal-enclosed RJ45 connector on one end
and an isolated, plastic-enclosed RJ45 connector on the other end. The metal
connector end of this cable assembly must be placed on the switch and not on
the PC.
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This is a 100 meter (maximum) straight-through or crossover
Category 5E Screened Twisted Pair (ScTP) cable. The shield on the controller's
RJ45 connector connects only to a Faraday cage in the controller; not to the
controller's DC ground. Therefore, the RJ45 connectors are floating and the
single point of ground is made at the switch to which the controller is
connected. Build this cable assembly with a shielded, metal-enclosed RJ45
connector on both ends.
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Fiber-optic cable must be used for outdoor
building-to-building communications for immunity to electromagnetic
interference caused by near lightning strikes, for ground isolation between
buildings, and to gain additional distance that goes beyond the 100 meters (328
ft) maximum allowed for screened twisted pair cabling (ScTP).
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