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6.1.3
Airflow blockers
It is highly recommended to use airflow blockers (ATCA slot) and AMC airflow blocker in the AT8060 (or any
empty AMC slot) to block any slot open to exterior air. Failure to do so, would go against forced air principles
applied on ATCA components, reducing system's cooling efficiency. Additionally, airflow blockers offer a
higher impedance to forced air than typical board, who tend to let more air into slots filled with AT8060 or
other ATCA boards.
6.1.4
System Airflow
The airflow impedance (pressure) curve gives multiple information and tips about thermal operational range
of the system carrying the AT8060. Once volumetric airflow capability of your chassis is known, the PQ curve
can help determine the ambient (room) temperature setpoint that should be used for optimal operation. If
you are using various models of ATCA blades into the same chassis, it is possible to find the best thermal fit.
Having the volumetric airflow value for each chassis slot, it is then possible to decide the layout using the
pressure curves.
Table 6-2:Pressure curve AT8060 with AM4320 in bay AMC
Test Poin
Airflow (CFM)
1
17.84
2
22.39
3
25.30
4
31.64
5
39.95
6
49.98
Figure 6-1:Pressure Curve in Imperial
Pressure drop
Airflow (m³/h)
(in H2O)
0,071
30.48
0.102
38.03
0.123
42.98
0.174
53.75
0.257
67.87
0.377
84.92
113
Thermal Considerations
Pressure Drop
(Pa)
17.75
25.38
30.56
43.27
63.92
93.99
AT8060
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