Site Electrical Wiring Guidelines For M Series, Mx Series, And T Series Routers; M120 Router Power Requirements; Table 30: Power System Electrical Specifications - Juniper Networks Hardware Manual

Site Electrical Wiring Guidelines for M Series, MX Series, and T Series Routers

Related
Documentation

M120 Router Power Requirements

Copyright © 2010, Juniper Networks, Inc.
All manuals and user guides at all-guides.com
Appendix D: Power Guidelines, Requirements, and Specifications for the M120 Router
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.
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 and surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
M120 Router Power Requirements on page 237
M120 AC Power, Connection, and Power Cord Specifications on page 231
M120 DC Power, Connection, and Cable Specifications on page 234
Table 30 on page 237 lists the AC and DC power system electrical specifications. Table
31 on page 238 lists the AC power supply electrical specifications. Table 32 on page 238
lists the DC power supply electrical specifications. Table 33 on page 239 lists the power
requirements for various hardware components when the router is operating under typical
voltage conditions. For PIC power requirements, see the M120 PIC Guide.

Table 30: Power System Electrical Specifications

Item
AC input voltage
AC input line frequency
Specification
Operating range: 100 to 240 VAC
47 to 63 Hz
237