E-4
SC847 Chassis Manual
E-6 Front Connector and Pin Denitions
2. Primary and Secondary Flash Chips
The Primary and Secondary Flash Chips en-
hance the backplane memory.
1. EPP Ports
The EPP ports are used for manufacturer di-
agnostic purposes only.
Backplane
Main Power
4-Pin Connector
(PWR0, PWR1,
and PWR3)
Pin# Denition
1
+12V
2 and 3 Ground
4 +5V
4. Backplane Main Power Connectors
The 4-pin connectors, designated PWR0,
PWR1, and PWR3, provide power to the
backplane. See the table on the right for pin
denitions.
5. Fan Connectors
The 3-pin connectors, designated Fan1, Fan2,
and Fan3, provide power to the fans.
See the table on the right for pin denitions.
Fan Connectors
(Fan1, Fan2, and Fan3)
Pin# Denition
1 Ground
2 +12V
3 Tachometer
3. Primary and Secondary Expander Chips
This Primary and Secondary Expander Chips
allow the backplane to support dual port, cas-
cading, and failover congurations.
6. - 9. SAS Ports
Primary and secondary SAS ports.