Warning
Be sure to disconnect the ground wire after you disconnect all power cables.
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. Pull the cover o the terminal block.
4. Identify the grounding point on the front panel of the power supply.
5. Connect the ground wire to the grounding point as follows:
a. Insert a 6-32 UNC screw (provided) through the ring terminal and into the grounding point on
the power supply.
See Figure 177.
Figure 177: Connecting the Ground Wire (Front-to-Back Model 10933 Shown)
1 = Grounding point
2 = Ground wire
b. Tighten the screw to 12.6 in‑lb (1.42 N m).
6. Connect the other end of the wire to a known reliable earth ground point at your site.
7. Connect the power supply to the source, following the instructions in Connecting a 300 W DC Power
Supply to the Source Voltage on page 231.
Connecting a 300 W DC Power Supply to the Source Voltage
Two 300 W DC power supplies are available: model 10933 (front-to-back airflow) and model 10944
(back-to-front airflow). Both can connect to either a +24 V or a –48 V power source.
The connection instructions, starting at step 4 on page 232, are dierent depending upon whether you
are connecting to a +24 V power source or 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.
Installing Your Extreme Networks Switch Install a 300 W Internal DC Power Supply
ExtremeSwitching Hardware Installation Guide 231
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