User`s manual

D-4
SC847J Chassis Manual
1. Primary I
2
C Connector
The I
2
C connector is used to monitor the power
supply status and to control the fans. See the
table on the right for pin denitions.
I
2
C Connector
PinDenitions
Pin# Denition
1 Data
2 Ground
3 Clock
4 No Connection
D-6 FrontConnectorandPinDenitions
Backplane
Main Power
4-Pin Connector
Pin# Denition
1 +12V
2 and 3 Ground
4 +5V
2. 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 denitions.
3. and 4. Primary and Secondary Expander
Chips
This primary and secondary expander chips
allow the backplane to support dual ports,
cascading, and failover.
5. EPP Ports
The EPP ports are used for manufacturer's
diagnostic purposes only.