Connecting a 450 W or 550 W DC Power Supply to the Source Voltage
Summit 450 W or 550 W DC power supply units must connect to a –48V 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. Slide the cover off the terminal block.
4. On each terminal, loosen the screw enough to so that the spade terminal can slide underneath the
captive square washer.
5. Connect the DC power input cables as follows:
a. Slide the spade terminal of the negative wire (–48 V) under the captive square washer on the
negative terminal (labeled –).
SH
_
161
(+)
(–)
RTN
-48V
Figure 187: Connecting the Negative Power Wire to a –48V Source (450 W or
550 W DC Power Source)
Installing Your Extreme Networks Switch
Install a 450 W or 550 W Internal DC Power Supply
ExtremeSwitching Hardware Installation Guide 239
