User`s manual

C-4
SC836 Chassis Manual
C-5 Front Connector and Pin Denitions
1. CD-ROM/Floppy 4-Pin Connectors
The 4-pin connectors, designated JP105 and
JP106, provide power to the CD-ROM and
oppy drives. See the table on the right for
pin denitions.
CD-ROM/
FDD Power
4-Pin Connector
(JP105 and JP106)
Pin# Denition
1 +5V
2 and 3 Ground
4 +12V
Backplane
Main Power
4-Pin Connector
(PWR0, PWR1, PWR2,
and PWR3)
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.
2 and 3. Primary and Secondary I
2
C Con-
nectors
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.
Note: 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
5. Primary and Secondary Expander Chips
This Primary and Secondary Expander Chips
allow the backplane to support dual ports,
cascading, and failover.