E-1
APPENDIX E: CPU AND POWER SUPPLY
REDUNDANCY
General
The ACE3600 CPU and power supply redundant configuration enables installation of two
redundant CPUs (CPU3680 only) and two redundant power supply modules. The redundant
CPU configuration is supported only by the CPU 3680 module, which enables motherboard
Ethernet interconnection between the two CPUs. The CPU redundancy ensures continuous
RTU operation if one CPU fails. The redundant power supply configuration ensures the supply
of the required RTU voltages when one of the power supplies fails.
For detailed information on configuring and programming CPU and power supply redundancy,
see the RTU Redundancy section of the ACE3600 STS Advanced Features manual.
Redundant CPU and Power Supply Frame
The redundant CPU and power supply configuration requires the dedicated dual power supply,
dual CPU and 4 I/O slots frame and motherboard.
This frame fits a wall mount installation, large metal chassis and large housing or 19” metal
base options.
Redundancy Definitions
• Primary CPU/power supply – Leftmost CPU/power supply
• Secondary CPU/power supply – Rightmost CPU/power supply
• Active CPU – the CPU that controls the I/O modules.
• Standby CPU – the CPU that does not control the I/O modules.
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