D-4
SC846 Chassis Manual
1 and 2. Primary and Secondary I
2
C Con-
nectors
The I
2
C Connectors are used to monitor HDD
activity and status. See the table on the right
for pin definitions.
I
2
C Connector
Pin Definitions (JP44
and JP45)
Pin# Definition
1
Data
2
Ground
3
Clock
4
No Connection
D-5 Front Connector and Pin Definitions
Backplane
Main Power
4-Pin Connector
Pin# Definition
1
+12V
2 and 3
Ground
4
+5V
3. Backplane Main Power Connectors
The 4-pin connectors, designated PWR1,
PWR2, PWR3, PWR4, PWR5, and PWR6,
provide power to the backplane. See the
table on the right for pin definitions.
5. Primary and Secondary Expander Chips
This Primary and Secondary Expander
Chips allow the backplane to support dual
ports, cascading, and failover.
4. Primary and Secondary Flash Chips
The Primary and Secondary Flash Chips
enhance the backplane memory.
6. EPP Ports
The EPP ports are used for manufacturer
diagnostic purposes only.