Juniper Networks M10i manual Power Requirements, Guidelines, and Specifications

Appendix C

Power Requirements, Guidelines, and Specifications

■Power Guidelines, Requirements, and Specifications on page 175

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 on page 175

■Router Power Requirements on page 176

■Chassis Grounding on page 177

■AC Power, Connection, and Power Cord Specifications on page 178

■DC Power, Connection, and Cable Specifications on page 179

Site Electrical Wiring Guidelines

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.

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