Site Electrical Wiring Guidelines For Juniper Networks Devices; Distance Limitations For Signaling; Radio Frequency Interference; Electromagnetic Compatibility - Juniper PTX3000 Hardware Manual

Site Electrical Wiring Guidelines for Juniper Networks
Devices
IN THIS SECTION

Distance Limitations for Signaling | 169

Radio Frequency Interference | 169

Electromagnetic Compatibility | 169

Distance Limitations for Signaling
Improperly installed wires can emit radio interference. In addition, the potential for damage from lightning
strikes increases if wires exceed recommended distances or if wires pass between buildings. The
electromagnetic pulse (EMP) caused by lightning can damage unshielded conductors and destroy electronic
devices. If your site has previously experienced such problems, you might want to consult experts in
electrical surge suppression and shielding.
Radio Frequency Interference
You can reduce or eliminate the emission of radio frequency interference (RFI) from your site wiring by
using twisted-pair cable with a good distribution of grounding conductors. If you must exceed the
recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data
signal when applicable.
Electromagnetic Compatibility
If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning
or radio transmitters, you might want to seek expert advice. Strong sources of electromagnetic interference
(EMI) can destroy the signal drivers and receivers in the network device and conduct power surges over
the lines into the equipment, resulting in an electrical hazard. It is particularly important to provide a
properly grounded and shielded environment and to use electrical surge-suppression devices.
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