Chapter 2: Installation
2-17
I
2
C to PCI Enable/Disable
The JI
2
C1/2 pair of jumpers allows
you to connect the System Manage-
ment Bus to the PCI expansion slots.
The default setting is closed (on) for
both jumpers to enable the connec-
tion. Both connectors must be set the
same (JI
2
C1 is for data and JI
2
C2 is for
the clock). See the table on right for
jumper settings.
I
2
C to PCI Enable/Disable
Jumper Settings
(JI
2
C1/2)
Jumper Setting Defi nition
Closed
Enabled
Open
Disabled
3rd Power Supply Fail Detect
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 Detect
Jumper Settings (J3P)
Jumper Setting Defi nition
Open
Disabled
Closed
Enabled
Note:
When enabled, the user needs to
write their own application software in or-
der to disable the Watch Dog timer.
Watch Dog
JWD controls Watch Dog, a system
monitor that takes action when a soft-
ware application freezes the system.
Jumping pins 1-2 will cause WD to
reset the system if an application is
hung up. Jumping pins 2-3 will gen-
erate a non-maskable interrupt signal
for the application that is hung up.
See the table on the right for jumper
settings. Watch Dog can also be
enabled via BIOS.
Watch Dog
Jumper Settings (JWD)
Jumper Setting Defi nition
Pins 1-2
Reset
Pins 2-3
NMI
Open
Disabled
