Chapter 2: Installation
2-17
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.
Onboard Speaker Enable/
Disable
The JD1 header allows you to use
either an external speaker or the
internal (onboard) speaker. To use
the internal (onboard) speaker, close
pins 6 and 7 with a jumper. To use an
external speaker, connect the speaker
wires to pins 4 through 7 of JD1. See
the table on the right for settings and
the table associated with the Power
LED/Speaker connection (previous
section) for pin defi nitions.
Onboard Speaker Enable/Disable
Pin Defi nitions (JD1)
Pins Defi nition
6-7
Jump for onboard speaker
4-7
Attach external speaker wires
