Juniper T640 Hardware Manual page 388

T640 Core Router Hardware Guide
354
NOTE:
INPUT 0
in slot
PEM0
feed A, and
INPUT 0
in slot must be powered by dedicated power feeds derived from feed
PEM1
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
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
10.
supply faceplate.
Route the positive and negative DC power cables through the top and bottom of each
11.
cable restraint.
Tighten the cable restraint captive screws to hold the power cables in place.
12.
Verify that the power cabling is correct, that the cables are not touching or blocking
13.
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.
14.
Switch the circuit breakers on the power supply to the on position (
15.
NOTE: If you have only one power supply, or if the router is completely
powered off when you power on the power supply, the Routing Engine
boots as the power supply completes its startup sequence.
Check the LEDs on the power supply faceplate. If the power supply is correctly installed
16.
and is functioning properly, the
momentarily, then lights steadily.
and on the three-input 240-A DC power supply
INPUT 1
must be powered by dedicated power feeds derived from
and on the three-input 240-A DC power supply
INPUT 1
LED lights steadily, and the
DC OK
(+) and (–) to indicate
| ).
LED blinks
CB ON
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