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• Fully redundant—Figure 7. The power source is fully redundant because there are two AC input modules and two DC
output power modules connected to each external device. If any power module fails, there is a full backup.
Note This configuration is not supported for switches and hubs.
• Redundant with reboot—Figure 8. In normal operation, the hub or switch is powered directly by its AC power connection.
If the internal power system of the hub or switch fails, the device powers down for about 30 seconds until the Cisco RPS
begins supplying power.
Note Redundancy with reboot works for the following devices only: FastHub 400 series hubs, Catalyst 1900 series and
Catalyst 2820 switches, and Catalyst 2900 series and Catalyst 3500 series XL switches.
• Mixed quasi-redundant and fully redundant—Figure 9. Three external devices can be powered, with two in
quasi-redundant mode and one in fully redundant mode.
Figure 6 Quasi-Redundant Configuration
Figure 7 Fully Redundant Configuration
External devices
150W or less
DC output
AC input
DC
DC
AC
AC
DC
DC
C
isco RPS
NM3998
DC output
AC input
DC
DC
DC
DC
C
isco RPS
11962
AC
AC