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Intel® Server System SR2500AL 
Peripheral and Hard Drive Sub-System 
Revision – 1.00 
 
 
Intel order number D31980-004 
53
 
5.5.2 
SAS/SATA Backplane Functional Architecture 
The figure below shows the functional blocks of the SAS/SATA backplane. 
AF000040
64P Internal
IDE Connector
(to 64P CD-ROM
Interposer Board)
44P Internal
IDE Connector
(from baseboard)
SAS/SATA HDD0
Connector (29P)
SAS/SATA HDD1
Connector (29P)
SAS/SATA HDD2
Connector (29P)
SAS/SATA HDD3
Connector (29P)
SEEPROM
Connector
HBA Connector
EEPROM
LM75
SAS/SATA HDD4
Connector (29P)
64P Front Panel Connector
(to Front Panel Board)
4P USB Connector
(for USB CD-ROM/FDD)
4P LCD Connector
VRS RST
Midplane
6th SAS/SATA
HDD Optional Board
SAS/SATA HDD5
Connector (7P)
(to 2U SAS/SATA
HDD Optional Board)
SAS/SATA PWR, LED,
PRSNT Connector (7P)
(to 2U SAS/SATA
HDD Optional Board)
SEEPROM
(FRU)
Flash
Room
I2C Bus0
I2C Bus1
I2C Bus2
LED
BUS SW
I2C Connector
IPMB_I2C
64P Connector X2
(from midplane)
VSC410
SAS_I2C
 
Figure 37. SAS/SATA Backplane Functional Block Diagram