Motorola ACE3600 RTU Owner's Manual page 379

Appendix E: CPU and Power Supply Redundancy
It is also possible to order a secondary 12V power supply (dual power supply configuration)
instead of the blank power supply module. In this case a dual power cable connecting between
the Power junction box and the two power supplies will be provided too.
Note: The redundant power supply configuration can be ordered with the 12V power supply
only. Redundant CPUs and power supplies are supported for CPU 3680 firmware version 15.0
and above, and by power supply version V2.75 and above only (manufactured from April
2011.) Use the STS Hardware Test to view the power supply version. The power supply
version is not upgradeable.
For additional redundant power supply configurations, see the ACE3600 System Planner.
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