Signaling Limitations; Radio Frequency Interference; Electromagnetic Compatibility; Router Power Requirements - Juniper J-series Services Router J2320 Getting Started Manual

J2320, J2350, J4350, and J6350 Services Router Getting Started Guide
Site Electrical Wiring Guidelines
WARNING: DC-powered J2350, J4350, and J6350 Services Routers are intended for
installation only in a restricted access location.
When planning the electrical wiring at your site, consider the factors discussed in
the following sections.

Signaling Limitations

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 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/surge requirements, intrabuilding
wiring must be shielded, and the shield for the wiring must be grounded at both
ends.

Router Power Requirements

Table 48 on page 107 and Table 49 on page 107 list the AC and DC power system
electrical specifications for J-series Services Routers.
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Power Guidelines, Requirements, and Specifications