User guide

Power Shelf and PoE Port Guidelines Installing and Managing Power over Ethernet (PoE)
page 3-8 OmniSwitch 7700/7800 Hardware Users Guide April 2005
Power Shelf and PoE Port Guidelines
The tables below list PoE power support for both non-redundant and redundant power supply
configurations.
Note. PoE power supply redundancy is not related to the switch’s chassis power supply redundancy. For
information on chassis power supply redundancy and minimum power requirements for switch opera-
tions, refer to the “Chassis and Power Supplies” chapter.
Non-Redundant Power Supply Configurations
Use the table below to determine the minimum number of power supplies needed in a non-redundant
PoE configuration.
For example, a PoE configuration with 192 powered devices, each requiring 6 watts of power, uses a total
of 1152 watts. Because two power supplies support up to 1043 watts only, a total of three power supplies
is required for this non-redundant 1152 watt PoE application.
Power Supplies Power
1576 watts
2 1043 watts
3 1572 watts
4 2100 watts