SR2300 2U Server Chassis Technical Product Specification
Revision 1.2
Intel Order Number A94546-004
41
6.3.1 Power
Requirements
The Hot-swap SCSI backplane provides power to up to seven peripherals. The integrator should
refer to the specific hard drive specification for power requirements. A typical 18 W drive would
require approximately 0.9A of +5V and 1.1A of +12V.
Table 18. Power Requirements
# of Typical
Hard Drives
Total 5V
Current (amps)
Total 12V
current (amps)
Total drive
power (watts)
1 0.9 1.1 17.7
2 1.8 2.2 35.4
3 2.7 3.3 53.1
4 3.6 4.4 70.8
5 4.5 5.5 88.5
6 5.4 6.6 106.2
7 6.3 7.7 123.9
6.3.2
Drive Activity / Fault LEDs
The SCSI backplane provides Drive Activity/Fault LED Indicators, mounted near each SCA-2
connector. The driving circuitry is entirely contained on the backplane. The drive fault LEDs are
activated by the microcontroller, and indicate a failure status for each drive. During initialization,
the microcontroller flashes the LEDs for one second as part of POST.
6.3.3
Internal Management Bus (IMB)
The Internal Management Bus is a system-wide server management bus, based on the Phillips*
I
2
C* bus specification. It provides a way for various system components to communicate
independently of the standard system interfaces (e.g., PCI bus or processor/memory bus). The
I
2
C bus controller is integrated into the microcontroller. IMB connectivity is provided to the SCSI
backplane via the front panel connector.
6.3.4 Local
I
2
C EEPROM and Temperature Sensor
An I
2
C bus temperature sensor is connected to the microcontroller on a private I
2
C bus. Micro-
controller programming implements the private I
2
C connection by explicitly setting and clearing
appropriate clock and data signals, to emulate an I
2
C-like interface to the sensor. Temperature
information is made available to other devices in the chassis using Enclosure Services
messages. A Dallas* DS1624 Serial EEPROM/Temperature Sensor implements this function.
The EEPROM stores the Field Replaceable Unit (FRU) information for the backplane.
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