Juniper Networks M10i manual Router Power Requirements, Radio Frequency Interference

M10i Internet Router Hardware Guide

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 20 on page 176 lists the power requirements for various hardware components when the router is operating under typical voltage conditions. For PIC power requirements, see the M10i Internet Router PIC Guide.

Table 20: Component Power Requirements

	Power Requirement	Power Requirement
Component	(Watts) @ 48 V	(Amps) @ 48 V
Base system (with fans running at normal	30 (approximate)	0.7	A (approximate)
speed)
Routing Engine	33.6	0.7	A
CFEB	67.2	1.4	A
HCM	10	0.2 A

You can use the information in Table 20 on page 176 and the M10i Internet Router PIC Guide to calculate power consumption for various hardware configurations, input current from a different source voltage, and thermal output, as shown in the following examples. (For an added safety margin, the examples use a generalized value for PICs of 0.625 A @ 48 V each.)

176■ Power Guidelines, Requirements, and Specifications