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SC825 Chassis Manual
C-6 Front Connector and Pin Definitions
#1 and #2 Backplane Main Power Connec-
tors
The 4-pin connectors, designated JP10, and
JP13 provide power to the backplane. See
the table on the right for pin definitions.
#3 and #4 CD-ROM/Floppy Pin Connectors
Pin connectors designated J17 and J18,
provide power to the CD-ROM and floppy
drives. See the table on the right for pin
definitions.
#5 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.
#6 and #7 I
C Connectors
2
The I
C Connectors, designated JP44 and
2
JP45, are used to monitor the HDD activity
and status. See the table on the right for pin
definitions.
Backplane
Main Power
4-Pin Connector
Pin#
Definition
1
+12V
2 and 3
Ground
4
+5V
CD-ROM/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
C Connector
2
Pin Definitions
Pin#
Definition
1
Data
2
Ground
3
Clock
4
No Connection
C-4
Appendix C: BPN-SAS-825TQ Backplane Specifications
#8 and #9 Sideband Headers
The sideband headers are designated JP51
and JP52. For SES-2 to work properly, you
must connect an 8-pin sideband cable. See
the table to the right for pin definitions.
#10 MG9072 Chip
The MG9072 is an enclosure management
chip that supports the SES-2 controller and
SES-2 protocols.
#11 Upgrade Header
The upgrade header is designated JP46 and is
used for manufacturing purposes only.
#12 to #19 SAS Ports
The SAS ports are used to connect the SAS
drive cables. The eight ports are designated
#0 - #7. Each port is also compatible with
SATA drives.
C-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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