Specifications

Connecting Power  23
Installing and Connecting the Device
3. Use a grounding cable to connect the device to earth ground, and do the
following:
a. Verify that a licensed electrician has attached an appropriate
grounding-cable lug to the grounding cable.
b. Connect one end of the grounding cable to a proper earth ground, such as
the rack in which the device is installed.
c. Connect the other end of the grounding cable to the two-hole grounding lug
at the rear of an SSG 500-series device.
Figure 10: AC Grounding
4. For each power supply unit (PSU), do the following:
a. Insert the appliance-coupler end of a power cord into the appliance inlet on
the power-supply faceplate.
b. Insert the plug into an AC power-source receptacle.
5. Verify that the power cord does not block access to device components or
drape where people can trip on it.
DC Power
Each DC PSU has a single DC input (–48 VDC and return) that requires a dedicated
25 A (–48 VDC) circuit breaker.
Most sites distribute DC power through a main conduit that leads to frame-mounted
DC power distribution panels, one of which might be located at the top of the rack
that houses the router. A pair of cables (one input and one return) connects each set
of terminal studs to the power distribution panel.
Grounding lugs
Washer
CAUTION: If your device includes an optional redundant DC PSU, connect each of
the two power supplies to different input-power sources. Failure to do so makes
the device susceptible to total power failure if one of the power supplies fails.