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Thermal Testing Process

Zeriva’s Thermal Measurement Process consists of reviewing the heat pattern of the entire board or system so technicians can look for temperature anomalies on the component level which may indicate future failure.

A Thermal Imager is used for the thermal test. For reference, the cross hair symbols on each image show the highest recorded temperature on the image and the lowest temperature on the image. These data points in and of themselves do not give any indication as to the integrity of the component. It is only an indication given by the imager to show the highest and lowest points in the image.

As examples images 1 through 20 show 20 sections of a Cisco 3750 48 Port PoE switch with no traffic load. Images 21 through 40 show 20 corresponding images of the same Cisco 3750 48 Port PoE switch with a full traffic load.

Images 1 -20: Cisco 3750 48 Port PoE with no traffic

Thermal Testing Process - Figure 1: Cisco 3750 48 port PoE with no traffic

Figure 1: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 2: Cisco 3750 48 port PoE with no traffic

Figure 2: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 3: Cisco 3750 48 port PoE with no traffic

Figure 3: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 4: Cisco 3750 48 port PoE with no traffic

Figure 4: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 5: Cisco 3750 48 port PoE with no traffic

Figure 5: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 6: Cisco 3750 48 port PoE with no traffic

Figure 6: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 7: Cisco 3750 48 port PoE with no traffic

Figure 7: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 8: Cisco 3750 48 port PoE with no traffic

Figure 8: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 9: Cisco 3750 48 port PoE with no traffic

Figure 9: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 10: Cisco 3750 48 port PoE with no traffic

Figure 10: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 11: Cisco 3750 48 port PoE with no traffic

Figure 11: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 12: Cisco 3750 48 port PoE with no traffic

Figure 12: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 13: Cisco 3750 48 port PoE with no traffic

Figure 13: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 14: Cisco 3750 48 port PoE with no traffic

Figure 14: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 15: Cisco 3750 48 port PoE with no traffic

Figure 15: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 16: Cisco 3750 48 port PoE with no traffic

Figure 16: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 17: Cisco 3750 48 port PoE with no traffic

Figure 17: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 18: Cisco 3750 48 port PoE with no traffic

Figure 18: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 19: Cisco 3750 48 port PoE with no traffic

Figure 19: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 20: Cisco 3750 48 port PoE with no traffic

Figure 20: Cisco 3750 48 port PoE with no traffic

Images 21 -40: Cisco 3750 48 Port PoE with Full Load

Thermal Testing Process - Figure 21: Cisco 3750 48 port PoE with no traffic

Figure 21: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 22: Cisco 3750 48 port PoE with no traffic

Figure 22: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 23: Cisco 3750 48 port PoE with no traffic

Figure 23: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 24: Cisco 3750 48 port PoE with no traffic

Figure 24: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 25: Cisco 3750 48 port PoE with no traffic

Figure 25: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 26: Cisco 3750 48 port PoE with no traffic

Figure 26: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 27: Cisco 3750 48 port PoE with no traffic

Figure 27: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 28: Cisco 3750 48 port PoE with no traffic

Figure 28: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 29: Cisco 3750 48 port PoE with no traffic

Figure 29: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 30: Cisco 3750 48 port PoE with no traffic

Figure 30: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 31: Cisco 3750 48 port PoE with no traffic

Figure 31: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 32: Cisco 3750 48 port PoE with no traffic

Figure 32: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 33: Cisco 3750 48 port PoE with no traffic

Figure 33: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 34: Cisco 3750 48 port PoE with no traffic

Figure 34: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 35: Cisco 3750 48 port PoE with no traffic

Figure 35: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 36: Cisco 3750 48 port PoE with no traffic

Figure 36: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 37: Cisco 3750 48 port PoE with no traffic

Figure 37: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 38: Cisco 3750 48 port PoE with no traffic

Figure 38: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 39: Cisco 3750 48 port PoE with no traffic

Figure 39: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 40: Cisco 3750 48 port PoE with no traffic

Figure 40: Cisco 3750 48 port PoE with no traffic

Zeriva technicians use these thermal scans in the thermal testing process to identify temperature anomalies that can indicate future component failure.

For comparison, here are images from the same area of a working power supply and a failed power supply. While imminent power supply failure may be indicated by excessive hot or cold spots, this supply has already failed and the input circuits show an increase in temperature while the rest of the circuits are ‘cold’.

Thermal Testing Process - Figure 41: Cisco 3750 48 port PoE with no traffic

Figure 41: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 42: Cisco 3750 48 port PoE with no traffic

Figure 42: Cisco 3750 48 port PoE with no traffic

Also, below are images from a working and a failed Cisco 3550. The failed unit shows memory and processor temperatures well below those of the working unit. Further thermal testing shows that the failed unit is unable to allocate memory resources.

Thermal Testing Process - Figure 43: Cisco 3750 48 port PoE with no traffic

Figure 43: Cisco 3750 48 port PoE with no traffic

Thermal Testing Process - Figure 44: Cisco 3750 48 port PoE with no traffic

Figure 44: Cisco 3750 48 port PoE with no traffic


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