APC RAID Subsystem SCSI-SATA II - Manual (Page 13)

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2.3.2 Rear View
1. Power Supply Alarm Reset button
You can push the power supply reset button to stop the power supply buzzer
alarm.
2. Uninterrupted Power Supply (UPS) Port (APC Smart UPS only)
The subsystem may come with an optional UPS port allowing you to connect a
APC Smart UPS device. Connect the cable from the UPS device to the UPS port
located at the rear of the subsystem. This will automatically allow the subsystem
to use the functions and features of the UPS.
3. R-Link Port: Remote Link through RJ-45 ethernet for remote
management
The subsystem is equipped with one 10/100 Ethernet RJ45 LAN port. You use
web-based browser to management RAID subsystem through Ethernet for
remote configuration and monitoring.
4. Monitor Port
The subsystem is equipped with a serial monitor port allowing you to connect a
PC or terminal.
5. Fan Fail indicator
If a fan fails, this LED will turn red.