Juniper PTX Series - Figure 44: Connecting the DC Source Power Cable Lugs to an Input Power

supply. The maximum torque that may be applied to this nut is 99 lb-in.
(11 Nm).
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.
CAUTION: All inputs on the DC PDU in slot PDU0 must be powered by
dedicated power feeds derived from feed A, and all inputs on the DC PDU
in slot PDU1 must be powered by dedicated power feedsderivedfrom feed
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
Figure 44: Connecting the DC Source Power Cable Lugs to an Input Power
Tray
Cable restraint
g006184
14. Tighten the cable restraint over the DC power cables.
15. Verify that the source power cables are connected to the appropriate terminal: the
positive (+) source cable to the return terminal (labeled RTN) and the negative (–)
source cable to the input terminal (labeled –48V).
95Copyright © 2012, Juniper Networks, Inc.
Chapter 11: Providing Power to the PTX5000 Packet Transport Switch