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 I2C Data

2

Ground

power

 

3

SCL

signal

IPMB I2C Clock

4

5 V standby

power

 

Auxiliary I2C Connector (J9E4)

TheSKA4 baseboard provides a 3-pin auxiliary I2C 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 I2C connection at the auxiliary I2C 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.

Technical Reference

105