Asus AP1600R-S5 - Manual (Page 29)

ASUS AP1600R 1U Rackmount Server 29
Backplane board
The backplane board includes the four hot-swappable connectors for the
SCSI drives accessible from the front panel, and several other connectors
that link to the motherboard and main power supply unit.
The backplane board comes pre-installed in the chassis. Normally, you do
not need to remove the backplane from the chassis unless it is damaged
and needs repair. In case you will have to remove and re-install the backplane,
take note of the location of the screws (indicated by circles in the figure
below) that secure it to the chassis.
80-Pin SCA Connectors
for the Hot-swappable
SCSI Drives
8-Pin Backplane
PSU Connector
2 x 140-Pin Connectors
(BPCON) for the
Bridge Board
68-Pin Connector for the
External Combo Drive Cage
USB Connector
6-Pin PSU SMBus Connector