4BSystem Board Interconnects
5.2
Bridge Board
The chassis 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 PCIe* x4 bus for SAS controller function.
See Table 19. 120-pin Server Board-to-Mid-plane Bridge Board Connector Pin-out.
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.
36
Figure 24. Bridge Board
Intel order number D31980-009
Intel® Server System SR2500AL
AF000037
Revision – 1.6