•
General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and
T Series Routers on page 148
M7i Router DC Power Supply Specifications
Table 23 on page 170 lists electrical specifications for the DC power supply.
Table 23: Electrical Specifications for DC Power Supply
Specification
Description
293 W
Maximum power output
Nominal: –48, –60 VDC
Operating range: –40.5 to –72 VDC
DC input voltage
10 A @ –48 V
Input DC current rating
+3.3 V @ 40 A, +2.5 V @ 20 A, +5.0 V @ 15 A, +12 V@ 3 A
Output voltages
NOTE:
The DC power supplies are marked –48 VDC. This is the nominal
voltage associated with the battery circuit. Any higher voltages are associated
only with float voltages for the charging function.
Related
Documentation
M7i DC Power Supply on page 23
•
•
Replacing a DC Power Supply on page 111
•
Replacing an M7i DC Power Cable on page 115
•
M7i Router Power Requirements on page 163
•
M7i Chassis Grounding, Connection, and Cable Specifications on page 167
•
M7i Power Supply LEDs on page 24
Site Electrical Wiring Guidelines for M Series, MX Series, and T Series Routers
•
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
Copyright © 2010, Juniper Networks, Inc.
170
M7i Multiservice Edge Router Hardware Guide
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