Asus TS700-E7/RS8 - Manual (Page 46)

2-26 Chapter 2: Hardware setup
Chapter 2
Each SATA/SAS connector is labeled (HDD1,
HDD2, HDD3, HDD4) so you can easily
determine their counterpart connectors at the
back side of the backplane. Refer to the table for
reference.
HDD Device Front side connector Back side connector
HDD 1 HDD1 CON1
HDD 2 HDD2 CON2
HDD 3 HDD3 CON3
HDD 4 HDD4 CON4
Back side
The back side of the SATA/SAS backplane faces the rear panel when installed.
This side includes the power connectors and SATA/SAS interfaces for the
motherboard Serial ATA connectors or the SAS card.
SGPIO1
SGPIO2
BPSMB1
U1
CON1
CON2
CON3
CON4
SGPIO_SEL1
SGPIO3