Power Requirements; Drive Activity / Fault Leds; Internal Management Bus (Imb); Local I C Eeprom And Temperature Sensor - Intel SR2300 Technical Product Specification

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.
# of Typical
Hard Drives
1
2
3
4
5
6
7
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*
2
I 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
2
I 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
An I C bus temperature sensor is connected to the microcontroller on a private I
controller programming implements the private I
appropriate clock and data signals, to emulate an I
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.
Revision 1.2
SR2300 2U Server Chassis Technical Product Specification

Table 18. Power Requirements

Total 5V
Current (amps)
0.9
1.8
2.7
3.6
4.5
5.4
6.3
2
C EEPROM and Temperature Sensor
Intel Order Number A94546-004
Total 12V
current (amps)
1.1
2.2
3.3
4.4
5.5
6.6
7.7
2
C connection by explicitly setting and clearing
2
C-like interface to the sensor. Temperature
Total drive
power (watts)
17.7
35.4
53.1
70.8
88.5
106.2
123.9
2
C bus. Micro-
41