3Com 5500-EI Getting Started Guide - Page 37

Uninterruptable Power, Additional Power to PoE Ports, Power Input before, User Intervention

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Page 37 highlights

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 Power Input after User Intervention User Intervention AC mains and RPS RPS only AC mains and RPS AC mains only RPS only AC mains AC mains and RPS AC mains and RPS Correct Response The unit remains powered by the RPS. 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. The unit remains powered by the RPS. The unit is powered by the RPS. Full PoE power can be enabled on all ports.

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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.