HP ProCurve 2520 Planning And Implementation Manual page 114

Planning and Implementation for the 3500yl Switches
Planning Your PoE or PoE+ Configuration
The table in this example configuration contains entries that show the PoE
power available for the 3500yl-48G-PWR.
3500yl 48 port
switches
620 RPS/EPS
Figure 9-4. Example of two 3500yl-48G-PWR Switches connecting to a HP
Internal PoE
Power Supply
Internal plus
External PoE
power Supply
External PoE
Power Supply
(failed Internal
Power Supply)
Each of the two switches can receive full redundant power from the 620 RPS/
EPS should one of the switches internal power supplies fail. The lowest loaded
bank of ports (1-24 or 25-48) has 22 watts reserved. That power is available
for use by the two highest priority ports in the bank, (in a default configuration
ports 1 and 2, or 25 and 26).
9-6
ProCurve 620 External and Redundant Power Supply (J8696A)
Source of Watts
Power Available
398
398 + 388
1 - 24 25 - 48
388
(22 W is
reserved for
either ports
1-24 or 25-48)
# of Ports Powered and
Average watts/Port
25 @ average 15.4 W each
48 @ average 7.5 W each
48 @ average 4.0 W each
48 @ average 15.4 W each
25 @ average 15.4 W each
48 @ average 7.5 W each
48 @ average 4.0 W each
Redundant # of Ports
Powered and Average
watts/Port
None
24 @ average 15.4 W each
48 @ average 7.5 W each
None