AM4011
Thermal Considerations
ID 1022-1626, Rev. 1.0
Page 6 - 11
P R E L I M I N A R Y
6.2.3
Airflow Paths
The area between the front panel and the AMC Card-edge connector is divided into five zones,
one I/O zone and four uniform thermal zones, A, B, C, and D. The PICMG AMC.0 Specification
states that the uniformity of the airflow paths’ resistance should provide an impedance on the
A, B, C, and D zones that is within ± 25% of the average value of the four thermal zones.
The following figure shows the thermal zones of a Mid-size AM4011.
Figure 6-6: Thermal Zones of the Mid-Size AM4011 Module
The following table indicates the deviation of the airflow rate on a Mid-size AM4011 module.
Table 6-2:
Deviation of the Airflow Rate on a Mid-Size AM4011
VOLUMETRIC
FLOW RATE [CFM]
DEVIATION OF THE AIRFLOW RATE
ZONE A
ZONE B
ZONE C
ZONE D
10
1.42%
-0.85%
-1.42%
1.99%
20
2.14%
-0.71%
-1.00%
2.43%
30
2.10%
-0.57%
-0.95%
2.48%
40
1.93%
-0.64%
-0.79%
2.08%
Note ...
The Mid-size AM4011 module has an airflow rate deviation of max. ± 2.5% of
the average value of the four thermal zones (max. ± 25% is allowed).
Positive deviation means increased airflow.
Negative deviation means decreased airflow.
Note ...
The Mid-size AM4011 module provides an open area of 44%. According to the
PICMG AMC.0 Specification, an open area of 20 to 70% perpendicular to the
airflow path is recommended.
open area
I/O Zone
Zone A
Zone B
Zone C
Zone D
32.8
34
34
34
34
