Filter
Top Products
Technical Reference 105
ICMB Connector (J1D2)
The external Intelligent Management Bus (ICMB) provides external access to IMB devices that are
within the chassis. For example, you can externally access chassis management functions, alert
logs, and post-mortem data. The ICMB connector also provides a mechanism for chassis power
control. As an option, you can configure a server with an ICMB adapter board to provide two
SEMCONN 6-pin connectors for daisy chained cabling.
Table 58. ICMB Connector (J1D2)
Pin Signal Type Description
1 SDA signal IPMB I
2
C Data
2 Ground power
3 SCL signal IPMB I
2
C Clock
4 5 V standby power
Auxiliary I
2
C Connector (J9E4)
TheSKA4 baseboard provides a 3-pin auxiliary I
2
C connector for OEM access to the IPMB.
This
connector is not isolated when power is off.
Any devices connected must remain powered in this
state or the BMC will not work properly.
A shorted I
2
C connection at the auxiliary I
2
C connector will prevent restoration of main power
because the BMC needs the bus to boot the server from standby power.
Table 59. IMB Connector Pin out (J8F1)
Pin Signal Description
1 Local I2C SDA BMC IMB 5VSTNDBY Clock Line
2 GROUND
3 Local I2C SCL BMC IMB 5VSTNDBY Data Line
Baseboard Fan Connectors (J3C1, J3A1, J4A1, J4C1)
There are four fan connectors located on the baseboard. These connectors are to be used for
additional processor cooling.
The SKA4 baseboard only supports monitoring a total of 8 tachometer fan inputs. The front panel
connector provides connections to all 8 tachometer fan inputs. The tachometer signals from these
four processor fan connectors are connected to the same tachometer fan signals FAN_TACH(4),
FAN_TACH(5), FAN_TACH(6), FAN_TACH(7) provided on the front panel connector J9E3.
Therefore take care to ensure only one connection is utilized at any given time.
Table 60. Processor Fan Connector #1 (J3C1)
Pin Signal Type* Description
1 Ground power GROUND is the power supply ground
2 12V power Power Supply 12V
3 Fan Tach out FAN_TACH signal is connected to the BMC to monitor the FAN speed
* Type (in/out) is from the perspective of the baseboard.