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D-1
APPENDIX
D
UPS Controller
This appendix explains the UPS controller (UPC) that controls the uninterruptible
power supply (UPS) unit.
D.1 Overview
The UPS is a unit to ensure a stable supply of power to the system even in the event
of a power supply failure or a massive blackout.
When the UPC port on the server is connected to the UPS signal cable that has a
UPC interface, if the UPS detects a power failure, it notifies the server of the failure
so that the server can perform emergency shutdown processing. This stops the
server safely.
D.2 Signal Cable
Use the shielded pair cable with the following specifications.
■ Direct current resistance (roundtrip/pair): 400 W/km or less
■ Cable length: Up to 10 m (33 ft.)