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Installing Your Device
4. Connect the other end of the wire to a known reliable earth ground point at your
site.
When you have connected the ground wire, connect the power supply to the power
source using the two input cables. Follow the instructions in "Connecting a 750 W DC
Power Supply to the Source Voltage."
Connecting a 750 W DC Power Supply to the Source Voltage
Two 750 W DC power supplies are available: model XN-DCPWR-750W-F (front-to-back
airflow) and model XN-DCPWR-750W-R (back-to-front airflow). Both can connect to a
–48 V power source.
The DC power connection at your facility must be made by a qualified electrician,
following these instructions:
Warning
Always make sure that the DC circuit is de-energized before connecting or
disconnecting the DC power cables on the DC power supply.
Caution
Provide proper connection and strain relief on the DC power cables in
accordance with all local and national electrical codes.
1. Verify that the DC circuit is de-energized.
2. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end
to an appropriate ground point on the rack.
3. Plug the connector that contains the negative (V+DC) and positive (V-DC) wires to
the power supply.
4. Connect the cables to the DC source voltage, using hardware appropriate to the
installation site and following local and national electrical codes.
Power up to the switch, following the steps in
Leave the ESD strap permanently connected to the rack, so that the strap is always
available when you need to handle ESD-sensitive components.
Powering up the Switch
An AC power is not included with the AC power supply. You can purchase AC power
cords for use in the US and Canada from Extreme networks or from your local supplier.
The cord must meet the requirements listed in
Powered Switches and AC Power Supplies
To power up an Extreme Networks switch, do the following.
1. For switches that are connected to AC power, connect the power cord to the AC
power input socket on the switch (or power supply) and to an AC power outlet.
Powering up the Switch
Power Cord Requirements for AC-
on page 80
Extreme 8720 Switch Hardware Installation Guide
Powering up the Switch
on page 57.
57
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