Juniper M7I Hardware Manual page 197

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Appendix D: Power Guidelines, Requirements, and Specifications for the M7i Router
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.
M7i Router Power Requirements on page 163
M7i Router AC Power Supply Specifications on page 166
M7i Router DC Power Supply Specifications on page 170
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