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Install a DC Power Supply
To install a DC power supply, follow this procedure (see Figure 9, Figure 10, Figure 11,
and Figure 12):
Verify that there is no power flowing to the power supply from the external
power source, so that the voltage across the leads of the power cables is
0 V. Ensure that there is no chance that the cable leads might become
active during the procedure.
Verify that the power switch for the power supply (located on the power supply faceplate)
is in the OFF (O) position.
- Verify that the grounding cable is attached to the chassis and
properly connected to an earth ground.
an electrostatic discharge (ESD) grounding strap to your bare wrist and connect
the strap to one of the ESD points on the chassis. Make sure the router is
attached to a proper earth ground.
Place one hand under the power supply and grasp the handle on the faceplate
with the other hand. Slide the power supply into the chassis until it contacts
Starting with the bottom screw, tighten (but do not overtighten) the
thumbscrews at each corner of the power supply faceplate.
that a licensed electrician has attached a listed power cable lug to each
power source cable.
- Loop the power cables through the hook located on the faceplate
to the right of the field-wiring terminals.
- Depending on the type of power cable lugs used, loosen
or remove the screws on the field-wiring terminals.
- Insert the power cable lugs into the appropriate field-wiring
terminals. Using a number 1 Phillips screwdriver, turn the screw on each field-wiring
terminal clockwise to secure the power cable lug. Apply between 8 lb-in. (.9
Nm) and 9 lb-in. (1.02 Nm) of torque to each screw.
- Insert the positive (+) source cable into the return terminal,
which is labeled RTN.
- Insert the negative (–) source cable into the input terminal,
which is labeled –48V.
The DC power supplies in slots P/S 0 and P/S 1 must
be powered by dedicated power feeds derived from feed A, and the DC power
supplies in slots P/S 2 and P/S 3 must be powered by dedicated
power feeds derived from feed B. This configuration provides the commonly
deployed A/B feed redundancy for the system. For information about
connecting to DC power sources, see the router hardware guide.
- Verify that the DC source
power cabling and the 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.
- Turn on the DC power source so that voltage flows to the power
- Press the switch on the power supply faceplate to the ON ( | )
position.When the power supply has powered on successfully, the green OUTPUT OK LED lights steadily.
After powering off a power supply, wait at least 60 seconds before turning
it back on. After powering on a power supply, wait at least 60 seconds before
turning it off.
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. If the Routing Engine finishes booting and you need to power off
the router again, first issue the CLI request system halt command.
For more information, see .
After a power supply is powered on, it can take up to 60 seconds for
status indicators—such as LEDs on the power supply, show chassis commands, and messages on the craft interface LCD—to indicate
that the power supply is functioning normally. Ignore error indicators that
appear during the first 60 seconds.
Figure 9: Install a DC Power
Supply in an M7i Router
Figure 10: Install a DC Power Supply in an M10i Router
Figure 11: Connect Power Cables to a DC Power Supply on an M7i Router
Figure 12: Connect Power Cables to a DC Power Supply on an M10i Router
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