Providing Power To The T640 Router; Figure 72: Connecting Dc Power To A Two-Input 160-A Dc Power Supply; Connecting Dc Power To A T640 Router With Three-Input 240-A Dc Power - Juniper T640 Hardware Manual

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CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
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.
Loosen the captive screws on the cable restraints on the right edge of the power
6.
supply faceplate.
Route the positive and negative DC power cables through the top and bottom of each
7.
cable restraint.
Tighten the cable restraint captive screws to hold the power cables in place.
8.
Verify that the power cabling is correct, that the power cables are not touching or
9.
blocking access to router components, and that they do not drape where people could
trip on them.
Replace the clear plastic cover over the terminal studs on the faceplate.
10.

Figure 72: Connecting DC Power to a Two-Input 160-A DC Power Supply

Overview of Connecting the T640 Router to Management and Alarm Devices on page 117
Connecting the T640 Grounding Cable on page 115
Connecting DC Power to a T640 Router with Three-input 240-A DC Power Supplies
(2-INPUT Mode) on page 126
Chapter 13: Providing Power to the T640 Router
and
(+) (–)
to indicate
125