C-4
SC825 Chassis Manual
#6-#7. I
2
C Connectors
The I
2
C Connectors, designated JP44 and
JP45, are used to monitor HDD activity and
status. See the table on the right for pin
definitions.
I
2
C Connector
Pin Definitions (JP44
and JP45)
Pin# Definition
1
Data
2
Ground
3
Clock
4
No Connection
SAS Activity LED Header
Pin Definitions (JP26)
Pin # Definition
Pin # Definition
1
ACT IN#0
6
ACT IN#4
2
ACT IN#1
7
ACT IN#5
3
ACT IN#2
8
ACT IN#6
4
ACT IN#3
9
ACT IN#7
5
Ground
10
Empty
Backplane
Main Power
4-Pin Connector
(JP10 and JP13)
Pin# Definition
1
+12V
2 and 3
Ground
4
+5V
C-5 Front Connector and Pin Definitions
#1-#2. Backplane Main Power Connectors
The 4-pin connectors, designated JP10 and
JP13, provide power to the backplane. See
the table on the right for pin definitions.
#3-#4. CD-ROM/Floppy 4-Pin Connectors
The 4-pin connectors, designated J17 and
J18, provide power to the CD-ROM and
floppy drives. See the table on the right for
pin definitions.
CD-ROM/
FDD Power
4-Pin Connector
(J17 and J18)
Pin# Definition
1
+5V
2 and 3
Ground
4
+12V
#5. Activity LED Header
The activity LED header, designated JP26,
is used to indicate the activity status of
each SAS drive. The Activity LED Header is
located on the front panel. For the Activity
LED Header to work properly, connect using
a 10-pin LED cable.