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SC825 Chassis Manual
D-5 Rear Connector Definitions
1. Backplane Main Power Connectors
The 4-pin connectors, designated JP10,
and JP13 provide power to the backplane.
2. CD/Floppy Drive Pin Connectors
Pin connectors designated J17 and J18,
provide power to the CD and floppy drives.
See the table on the right for pin definitions.
3. Activity LED Headers
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
lead header to work properly, connect to it
using a 10-pin LED cable. This is only used
when the activity LED is not supported by
the hard drive.
4, 5. I
C Connectors
2
The I
C connectors, designated JP44 and
2
JP45, are used to monitor the HDD activity
and status.
Main Power
4-Pin Connector
Pin#
Definition
1
+12V
2 and 3
Ground
4
+5V
CD/FDD Power
4-Pin Connector
Pin#
Definition
1
+5V
2 and 3
Ground
4
+12V
SAS Activity LED Header
Pin Definitions
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
I
2
C Connector
Pin Definitions
Pin#
Definition
1
Data
2
Ground
3
Clock
4
No Connection
D-4
Appendix D: BPN-SAS3-825TQ Backplane Specifications
6, 7. Sideband Headers
The sideband headers are designated JP51
and JP52. For SES-2 to work properly, you
must connect an 8-pin sideband cable.
8. MG9072 Chip
The MG9072 is an enclosure management chip that supports the SES-2 controller
and SES-2 protocols.
9. Upgrade Header
The upgrade header is designated JP46 and is used for manufacturing purposes
only.
10-17. SAS3 Ports
Connect these ports with the SAS drive cables. The eight ports are designated
#0 - #7. Each SAS port is compatible with SATA drives.
SAS3 Connectors
Connector
Label
Port
J5
#0
SAS#0
J6
#1
SAS#1
J7
#2
SAS#2
J8
#3
SAS#3
J10
#4
SAS#4
J12
#5
SAS#5
J14
#6
SAS#6
J16
#7
SAS#7
D-5
Sideband Headers
Pin #
Definition
Pin #
Definition
2
SGPIO:
1
Controller
SDIN;
ID (SB6)
I
C:
2
Backplane
Addressing
4
SGPIO:
3
GND (SB2)
SDOUT;
I
C: Reset
2
6
GND (SB3)
5
SGPIO:
SLOAD;
I
2
C: SDA
8
Backplane
7
SGPIO:
ID (SB7)
SCLOCK;
1
C: SCL
2
10
No Connec-
9
No Connec-
tion
tion
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