C-4
SC933 Chassis Manual
C-6 Front Connector and Pin Definitions
Backplane
Main Power
4-Pin Connector
(PWR0, PWR1, PWR2,
and PWR3)
Pin# Definition
1
+12V
2 and 3
Ground
4
+5V
4. Backplane Main Power Connectors
The 4-pin connectors, designated PWR0,
PWR1, PWR2, and PWR3, provide power to
the backplane. See the table on the right for
pin definitions.
1. Primary and Secondary I
2
C Connectors
The I
2
C connectors are used to monitor the
power supply and to control the fans. See
the table on the right for pin definitions. There
are two connectors, one primary and one
secondary.
These connectors are optional and should only
be used by qualified technicians.
I
2
C Connector
Pin Definitions
Pin# Definition
1
Data
2
Ground
3
Clock
4
No Connection
3. Primary and Secondary Expander Chips
This primary and secondary expander chips
allow the backplane to support dual ports,
cascading, and failover.
2. Primary and Secondary Flash Chips
The primary and secondary flash chips en
-
hance the backplane memory.
5. EPP Ports
The EPP ports are used for manufacturer
diagnostic purposes only.