Sun Microsystems SPARCengine Ultra AXi, Technical Manual

Page: 42 / 174

2-10 SPARCengine Ultra AX i OEM Technical Manual • May 1999
Motherboard Connectors J3603
Speed Control 8 to 12 VDC from software-controlled digital-to-analog
converter
Feedback TTL level open collector output
Fan Control Firmware controls fan on-off, software controls fan
speed using thermistor input
Recommended Fans The OEM-supplied fan (when required for CPU modules
with pin fin heatsinks in demanding system
configurations) must be 12 VDC, variable speed with
sensor feedback to detect a failed fan
Sanyo Denki: Model 109R0812H4D01
NMB: Model 3110KL-04W-B39
Note –
When supplied by Sun for modules with straight fin heatsinks (e.g., 360
MHz, part number 501-5148-xx; 440 MHz, part number 501-5149-xx), this fan is part
of the CPU module hold-down bracket (see FIGURE C-6 on page C-9 for an
illustration).
Back/Optional Cooling Fan
This OEM-supplied fan may be optional depending upon specific configuration.
Motherboard Connectors J3602
Speed Control 8 to 12 VDC from software-controlled digital-to-analog
converter
Feedback TTL level open collector output
Fan Control Firmware controls fan on-off, software controls fan
speed using thermistor input
Recommended Fans The fan must be 12 VDC, variable speed with sensor
feedback to detect a failed fan
Sanyo Denki: Model 109R0812H4D01
NMB: Model 3110KL-04W-B39