Appendix D:
BPN-SAS3-743A Backplane Specifications
69
Rear Connectors and Pin Definitions
#1. CPLD Chip
The CPLD is an enclosure management chip that supports the SGPIO and LED management.
#2. JTAG Connector
The JTAG connector, designated J16, is used for diagnostic purposes. This connector
should not be used as it is for internal testing only.
#3. – 4. SAS3 Ports
The SAS3 ports are used to connect the SAS3 drive cables. The 2 ports are designated
JSM0, for drives at SAS #0-#3, and JSM1, for drives at SAS #4-#7 (see section 2-4 for
SAS drive locations). Each port is also compatible with SATA drives. However, mixing SAS3
and SATA drives in the same enclosure is not recommended.
#5. – #7. Backplane Main Power Connectors
The 4-pin connectors, designated JPW1,
JPW2, and JPW3, provide power to the
backplane. 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
