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Chassis SC745 User's Manual
#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.
Rear Connectors and Pin Definitions
#1. and #2. JTAG Connector and Upgrade Connectors
The JTAG and Upgrade connectors, designated JP47 and JP46, are used for diagnostic
purposes. These connectors should be used by a certified and experienced technician.
#3. MG9072 Chip
The MG9072 is an enclosure management chip that supports the SES-2 controller and
SES-2 protocols.
#4. 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.
#6. and #7. Sideband Headers
The sideband headers are designated JP51
and JP52. For SES-2 to work properly, you
must connect an 10-pin sideband cable. See
the table to the right for pin definitions.
Backplane Main Power
4-Pin Connector
Pin# Definition
1
+12V
2 and 3
Ground
4
+5V
Sideband Headers
Pin # Definition
Pin # Definition
2
Backplane
Addressing (SB5)
1
Controller ID
(SB6)
4
Reset (SB4)
3
GND (SB2)
6
GND (SB3)
5
SDA (SB1)
8
Backplane ID (SB7)
7
SCL (SB0)
10 No Connection
9
No Connection
#8. and #9. 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
Pin# Definition
1
Data
2
Ground
3
Clock
4
No Connection
#10. to #17. 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. However, do not mix SAS and
SATA drives in the same enclosure.
