Datasheet

Intel® Server System SR1550AL System Board Interconnects
Revision – 1.3
Intel order number D31982-006
33
Table 26. Passive MidPlane HBA I2C Connector Pinout
PIN Signal Description
1 SMB_SAS_EDGE_DAT
2 GND
3 SMB_SAS_EDGE_CLK
5.2 Bridge Board
The system utilizes a bridge board to route signals from the server board to the mid-plane board.
The bridge board carries signals for three USB ports, SSI front panel control signals, video,
various I2C buses, fan control signals, and a PCI Express* x4 bus for SAS controller function.
See Table 19. 120-pin Bridge Board Connector Pin-Out.
Figure 23. Bridge Board
5.3 Hot-Swap SATA/SAS Backplane
The hot swap backplane provides support for both SAS and SATA hard drives. There are no
hard drive cables that connect to the backplane. All hard drive control signals are routed from
the mid-plane board which plugs directly into the backplane.
Figure 24. Hot-Swap SAS/SATA Backplane (Front Side View)