User`s manual

D-4
SC936 Chassis Manual
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
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 denitions.
1. Primary and Secondary I
2
C Connectors
The I
2
C connectors are used to monitor hard
drive activity and status through LED. See the
table on the right for pin denitions. There
are four total connectors--two primary and
two secondary.
These connectors are optional and should
only be used by qualied technicians.
I
2
C Connector
Pin Denitions
Pin# Denition
1 Data
2 Ground
3 Clock
4 No Connection
3. Primary and Secondary Expander Chips
These 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 ash chips en-
hance the backplane memory.
5. EPP Ports
The EPP ports are used for manufacturer
diagnostic purposes only.