Clock Routing Configuration; Appendix A (Pin Assignment Of Connectors In Mic-3042A Backplane); Mic-3042 User Manual; Figure 3-5: V I/O Voltage Selection - Advantech MIC-3042A User Manual

+5V +5V
VIO
VIO
+3.3V
+3.3V
VIO for +5V VIO for +3.3V

Figure 3-5: V I/O voltage selection

3.5.4 Fan Module Connector
The FAN connectors provide +12 V power for fan operation and accepts the
tachometer output from the fans. Note the fan4 is reserved as factory default.
3.5.5 LED Status Connector
This connector provides digital outputs for the alarm module (MIC-3924L-A) to the
chassis front panel notification used. Three alarm LED (red) and one power status
LED (green) is included for Fan_fail, Power_fail, and Temp_fail for alert notification.

3.6 Clock Routing Configuration

The backplane is configured to comply with the clock routing specified in the
CompactPCI™ Specification, PICMG 2.0, R3.0. This Specification requires that each
slot be independently clocked.
MIC-3042 User Manual --- Page 18