User guide

Applications
Network equipment in high voltage areas can be at risk due to Ground Potential Rise (GPR). A copper
network cable referenced to a remote ground can become a path for high voltages during a ground fault.
Use of all-dielectric fiber optic cable instead of copper completely eliminates the presence of a remote
ground, which dramatically increases safety of personnel and reliability of equipment. By using fiber optic
cable, the 3+2 10/100 Ethernet over fiber switch provides absolute electrical isolation between both ends
of the network.
Copper twisted pair Ethernet is limited to 100m/328ft without extenders. Using fiber optic cable provides
long distance service up to 120km/74mi. without any additional equipment. Optical fiber is immune to
EMI/RF interference, ground loops, and high voltage surges from lightning or ground faults, and is ideal in
electrically noisy environments such as near large power sources, electrical motors, and radio
communications equipment.
Typical Ethernet System Diagram
Each 3+2 Ethernet Switch may be connected to another switch as shown in the diagram above,
extending the network and creating access points. The switch may also be connected to other RLH
switches, fiber converters and other 100Base-FX fiber based networking devices.
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