Figure 12: Dual Dc Power Source - Juniper LN2600 Hardware Manual

Copyright © 2015, Juniper Networks, Inc.
To connect the DC source power cables to the router for each power supply:
Power off the dedicated customer site circuit breakers. Ensure that the voltage across
1.
the DC power source cable leads is 0 V and that there is no chance that the cable
leads might become active during installation.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Verify that the DC power cables are correctly labeled before making connections to
3.
the power supply. In a typical power distribution scheme where the return is connected
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the and cables to chassis ground:
48V RTN
The cable with very large resistance (indicating an open circuit) to chassis ground
is –48V .
The cable with very low resistance (indicating a closed circuit) to chassis ground is
.
RTN
Loosen the screws from the power terminals using a 2.5 mm slotted screw driver.
4.

Figure 12: Dual DC Power Source

CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled (+) and (–) to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
Insert the power cables as specified to the respective power terminals, and secure
5.
the cables with the screws.
Secure the positive (+) DC source power cable to the
Secure the negative (–) DC source power cable to the
Chapter 3: Installing the LN2600 Rugged Security Router
N T Y
W A R R A
D
RE MO VE
VO ID IF
RTN (return) terminal.
(input) terminal.
–48V
23