Supermicro 2020A-8R, User Manual

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A+ Server 2020A-8R User's Manual
SCSI Termination Enable/
Disable
Jumper JPA2 and JPA3 are used to
enable or disable termination for the
SCSI Channel A and B connectors, re-
spectively. The default setting for both
is open to enable termination. See the
table on right for pin defi nitions.
Note: In order for the SCSI drives to
function properly, please do not change
the default setting (enabled) set by the
manufacturer.
SCSI Term. Enable/Disable
Jumper Settings (JPA2/JPA3)
Jumper Setting Defi nition
Open Enabled
Closed Disabled
3rd Power Supply Fail Signal
Enable/Disable
The system can notify you in the event
of a power supply failure. This feature
assumes that three redundant power
supply units are installed in the chas-
sis. If you only have one or two power
supplies installed, you should disable
the function with the J3P header to pre-
vent false alarms. See the table on the
right for jumper settings.
3rd Power Supply Fail Signal
Jumper Settings (J3P)
Jumper Setting Defi nition
Open Enabled
Closed Disabled
Watch Dog Enable/Disable
JWD controls the Watch Dog function.
Watch Dog is a system monitor that
can reboot the system when a software
application hangs. Pins 1-2 will cause
WD to reset the system if an applica-
tion has frozen. Pins 2-3 will generate
a non-maskable interrupt signal for the
application that is frozen. See the table
on the right for jumper settings. Watch
Dog must also be enabled in BIOS.
Watch Dog
Jumper Settings (JWD)
Jumper Setting Defi nition
Pins 1-2 Reset
Pins 2-3 NMI
Open Disabled
Note: When enabled, the user needs to
write their own application software in or-
der to disable the Watch Dog Timer.