Manual

Thermal Considerations
119 AT8050
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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 AT8050 (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. Moreover, airflow blockers offer a higher
impedance to forced air than typical board, who tend to let more air into slots filled with AT8050 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 AT8050. 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, is it then possible to decide the layout using the
pressure curves.
Table 6-2:Pressure curve AT8050 with AMC Filler
Figure 6-1:Pressure Curve in Imperial
Test Poin Airflow (CFM) Pressure drop
(in H2O)
Airflow (m³/h) Pressure Drop
(Pa)
1 12,04 0,038 20,46 9,57
2 15,03 0,048 25,54 12,02
3 21,02 0,069 34,00 17,28
4 25,00 0,100 42,48 24,91
5 30,01 0,142 50,99 35,26
6 35,02 0,195 59,50 48,61
7 40,02 0,257 68,00 64,07
8 45,06 0,321 76,55 79,95
9 50,01 0,381 84,97 95,00
0,02
0,07
0,12
0,17
0,22
0,27
0,32
0,37
0,42
10,00 15,00 20,00 25,00 30,00 35,00 40,00 45,00 50,00 55,00
Airflow (CFM)
Pressure (Inch H2O)