Juniper M10i Hardware Manual page 220

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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 router 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.
CAUTION: To comply with intrabuilding lightning and surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
M10i Router Power Requirements on page 188
M10i Router AC Power Supply Specifications on page 191
M10i Router DC Power Supply Specifications on page 191
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