Datasheet

Replacing an M7i DC Power Cable

On a DC-powered router, the power cables from the external DC power sources connect

to field-wiring terminals on each power supply.

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Removing an M7I DC Power Cable on page 120

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Installing an M7i DC Power Cable on page 120

Removing an M7I DC Power Cable

Before removing a DC power cable from an M7i router with only one power supply, you

must power off the router. To remove a DC power cable from the router:

1. Shut off the power flowing from the external power sources, 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.

2. Press the power switch on the power supply faceplate to the OFF (O) position.

NOTE: If you are power cycling the power supply rather than shutting it

off for a time, wait at least 60 seconds after turning it off before turning

it back on. If you need to power it off again, wait for at least 60 seconds

after powering it on.

3. Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal

counter-clockwise to loosen the terminal connector from around the cable lug.

4. Remove the DC cables from the terminal connectors and from the hook located on

the faceplate to the right of the field-wiring terminals.

5. Verify that the removed DC cables are not touching or blocking access to any router

components.

Installing an M7i DC Power Cable

For information about the required DC power cables, see “M7i DC Power Cable and Cable

Lug Specifications” on page 172.

CAUTION: 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. You must ensure that power connections

maintain the proper polarity. The power source cables might be labeled (+)

and (–) to indicate their polarity.

M7i Multiservice Edge Router Hardware Guide