Juniper Networks EX3200, EX4200 page 235

WARNING: It is particularly important to provide a properly grounded and shieldedenvironment and to use electrical surge-suppression devices.

GuidelinesSite Wiring Factor

If your site experiences any of the following problems, consult

experts in electrical surge suppression and shielding:

■Improperly installed wires cause radio frequency

interference (RFI).

■Damage from lightning strikes occurs when wires exceed

recommended distances or pass between buildings.

■Electromagnetic pulses (EMPs) caused by lightning

damages unshielded conductors and electronic devices.

Signaling limitations

To reduce or eliminate radio frequency interference (RFI) from

your site wiring, do the following:

■Use 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.

Radio frequency interference

If your site is susceptible to problems with electromagnetic

compatibility (EMC), particularly from lightning or radio

transmitters, seek expert advice.

Some of the problems caused by strong sources of

electromagnetic interference (EMI) are:

■Destruction of the signal drivers and receivers in the

switch

■Electrical hazards as a result of power surges conducted

over the lines into the equipment

Electromagnetic compatibility

Juniper Networks EX3200, EX4200 manual page 235