Appendix C Power Requirements, Guidelines, And Specifications; Power Guidelines, Requirements, And Specifications; Site Electrical Wiring Guidelines; Distance Limitations For Signaling - Juniper M10i Hardware Manual

Appendix C
Power Requirements, Guidelines, and
Specifications

Power Guidelines, Requirements, and Specifications

Site Electrical Wiring Guidelines

Power Guidelines, Requirements, and Specifications
The router uses either AC or DC power. There are four load-sharing power supplies
located at the bottom rear of the chassis, as shown in Figure 2 . The power supplies
connect to the midplane, which distributes power to router components according
to their individual voltage requirements. When the power supplies are installed and
operational, they automatically share the electrical load. If a power supply stops
functioning for any reason, the remaining power supplies instantly begin providing
all the power the router needs for normal functioning and can provide full power
indefinitely.
For site wiring and power system guidelines, requirements, and specifications, see
the following sections:
Site Electrical Wiring Guidelines
Router Power Requirements
Chassis Grounding on page 177
AC Power, Connection, and Power Cord Specifications
DC Power, Connection, and Cable Specifications
When planning the electrical wiring at your site, consider the factors discussed in
the following sections.

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.
on page 175
on page 175
on page 176
on page 179
Power Guidelines, Requirements, and Specifications
on page 178
175