Installation guide

BlackDiamond 20808 Power Supplies
BlackDiamond 20808 Switch Hardware Installation Guide
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Each 1900 W DC PSU contains two cooling fans at the right of the unit. Airflow enters from the right
side vents on the PSU and exits out the left side vents of the switch. Airflow through the PSU is
independent from the airflow through the rest of the switch.
To use the 1900 W DC PSU, you need a -48 V DC power source capable of providing 60 A dedicated
power to each 1900 W DC PSU installed in the switch.
For information about installing the 1900 W DC PSU, see Chapter 4.
NOTE
Extreme Networks does not recommended using the 1900 W DC PSU in combination with an Extreme Networks
2400 W AC PSU in the same BlackDiamond 20808 system.
For central DC power connections, the 1900 W DC PSU is intended to be installed only in restricted access
locations (such as a dedicated equipment room, equipment closet, or central office) in accordance with Articles
110-16, 110-17, and 110-18 of the National Electric Code, ANSI/NFPA-70.
LEDs
The Extreme Networks 1900 W DC PSU has status LEDs on the front panel. Table 8 describes the
meanings of the LEDs.
Fuse
The Extreme Networks 1900 W DC PSU -48 V and -48 V RTN legs are both fused. Power to the switch
may still be live if the -48 V RTN fuse is open. This is not a field operator-replaceable fuse. In the event
of failure, immediately return the 1900 W DC PSU to Extreme Networks for a complete replacement.
WARNING!
Field operators must not attempt to open the 1900 W DC PSU enclosure for any reason; the PSU does not contain
user-serviceable parts. In the event of failure, return the defective 1900 W DC PSU to Extreme Networks for repair
or replacement.
Table 8: LEDs on the 1900 W DC PSU
LED Type and Color
PSU Condition
DC IN
Green
DC OUT
Green
ALM
Red
Power supply outputs working normally On On Off
DC input power present On Off Off
No input power to this PSU only
(receiving standby power from the chassis)
Off Off On
No input power to any PSU Off Off Off
Power supply failure On Off On