3Com Switch 5500-EI User Manual

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Connecting a Redundant Power Supply 37
■ Uninterruptable Power — the system allows easy connection and
maintenance of batteries to the RPS shelf to further increase the
availability of the system.
■ Additional Power to PoE Ports — the PoE switch’s internal AC
Power Supply provides enough power for most network applications.
You can use the RPS to supplement power (up to a maximum of
15.4W), including full backups of all PoE devices on the network.
Table 13 outlines the behavior of the switch when changes occur to the
power system, such as removing the AC mains cable when the RPS is
attached. The responses to the different power inputs are controlled by
the switch’s internal power supply and not by the RPS.
Table 13 Switch Power Inputs
Power Input before
User Intervention
Power Input after
User Intervention
Correct Response
AC mains and RPS RPS only The unit remains powered by the RPS.
AC mains and RPS AC mains only The unit is powered by the AC mains.
PoE is dropped on all ports, however
the unit does not reset. PoE restarts
and is powered by the remaining
power from the AC mains. PoE ports
will be dropped depending on their
preset priority level.
The total power available to the
switch may be less than when
powered from the RPS. Some PoE
ports may be dropped because they
are unable to obtain the power they
require.
RPS only AC mains and RPS The unit remains powered by the RPS.
AC mains AC mains and RPS The unit is powered by the RPS. Full
PoE power can be enabled on all
ports.
10014925-AD_S5500_GSG.book Page 37 Thursday, August 16, 2007 12:29 PM

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