3Com SuperStack 3C16071B, User Manual

Page: 19 / 64

Using the Advanced RPS 19
The SuperStack unit is supplied with power from an AC mains supply.
A power module is connected using the standard DC cable to the
RPS socket on the SuperStack unit (see Figure 9). If the internal
power supply fails, the SuperStack unit enables the Advanced RPS.
CAUTION: If the product you are connecting to the power module
does not have the auto-enable feature, ensure the mains cable is
removed from it before attempting to connect it to the
Advanced RPS
.
When the Advanced RPS takes over supplying power to the
SuperStack unit, the unit may reset, as in a power cycle.
Some SuperStack units, when set up in this configuration, can use
the Advanced RPS as their primary source of power. In the case of
Advanced RPS failure, the SuperStack unit’s own PSU acts as a
redundant power supply and will take over supplying power to the
SuperStack unit. Please refer to the documentation that accompanies
the SuperStack unit for more information.
Figure 9
Advanced RPS Managed Redundancy Configuration
Full Redundancy
This is the mission-critical mode of use, offering full redundancy. This
configuration provides the most resilience for your network.
The SuperStack unit takes no power from the AC mains supply, and
should not be directly supplied with mains power. A ’Y’ cable
connects two power modules to the unit, providing full redundancy
(see Figure 10).
16070ug4.bk.book Page 19 Thursday, December 14, 2000 12:17 PM