PoE/PoE+ Planning and Implementation Guide 2011-09

13-14
Planning and Implementation for the E5400zl/E8200zl Switches
Configuration Examples
In a system with mixed power supplies, failover is calculated based on the
largest power supply failing. If it turns out to be the smaller power supply that
fails, some of the ports that were powered off during the power failure will
come back on. For example, in figure 4-5 there are mixed power supplies
offering 900 W+ 273 W for 1173 W total. Failover power will be calculated at
273 W, so if a power supply fails all the controllers will fall back to a power
level that can be supported by 273 W. If it turns out the 273 W supply failed,
the system will detect that during the power supply polling cycle and increase
power back up to 900 W total. This would result in some load coming back on
if the total power used by all the loads in the box was greater than 273 W.
ProCurve E5406zl and E8206zl Configurations
using the Power Supply Shelf
The following example configurations are the same for the E5406zl and
E8206zl switches. As shown in Figures 13-7 and 13-8, the Power Supply Shelf
can be connected to the E5406zl or the E8206zl to supply extra or redundant
PoE/PoE+ power to the PoE modules.
Figure 13-7. Connecting the EPS to one E5406zl or E8206 zl switch
Figure 13-8. Connecting the EPS to two E5406zl or E8206zl switches
To Power
Source
EPS Cables
To Power
Source
E5406zl
or
E8206zl
EPS Cables
E5406zl
or
E8206zl
E5406zl
or
E8206zl
To Power
Source
To Power
Source