NOTE: All inputs on the two-input 160-A DC power supply in slot PEM0 must be
powered by dedicated power feeds derived from feed A, and all inputs on the
two-input 160-A DC power supply in slot PEM1 must be powered by dedicated power
feeds derived from feed B. This configuration provides the commonly deployed A/B
feed redundancy for the system.
NOTE: INPUT 0 and INPUT 1 on the three-input 240-A DC power supply in slot PEM0
must be powered by dedicated power feeds derived from feed A, and INPUT 0 and
INPUT 1 on the three-input 240-A DC power supply in slot PEM1 must be powered
by dedicated power feeds derived from feed B. This configuration provides the
commonly deployed A/B feed redundancy for the system.
NOTE: All inputs on the four-input 240-A DC power supply in slot PEM0 must be
powered by dedicated power feeds derived from feed A, and all inputs on the
four-input 240-A DC power supply in slot PEM1 must be powered by dedicated power
feeds derived from feed 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 (+) 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.
3. Route the power cable through the cable restraint.
4. Tighten the cable restraint captive screw or screws to hold the power cable in
place.
5. Verify that the DC source power cabling and grounding cabling are correct, that
they are not touching or blocking access to router components, and that they
do not drape where people could trip on them.
6. Replace the clear plastic cover over the terminal studs on the faceplate.
7. Attach the power cable to the external DC power source.
8. Switch on the external circuit breaker that provides voltage to the DC power
source cable that has been replaced.
9.
For a three-input 240-A power supply, verify that the INPUT PRESENT LED is lit
steadily, indicating that the input is receiving power.
10.
Switch the circuit breakers on the power supply to the on position (|).
Installing a T640 DC Power Supply Cable ■ 27
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