[Karlnet] Heat Problems Continued

[Michael McDermott <michael@veritech.com.au>]

I'm aware the KN-100 boards could/do have possible heat problems, but 
apparently "the heat issue is resolved".

Yesterday, a customer reported that 5 of his KN-100 boards failed due to 
heat. Yesterday the temperature had only reached 35 degrees.

4 of the units were equipped with senao 200mw cards (with heat sinks) in 
Demarc outdoor enclosures. Ethernet cable lengths were 10-15 meters and 
12V1A power supplies where used. Also the customer was using latest 
revision of the firmware (4.44).

1 of the units was equipped with a 30mw (Orinoco) card in Demarc outdoor 
enclosure, Ethernet cable length was 10-15 meters and 12V1A power supply. 
This one also failed in this heat.

All of these units failed with an on board temperature of about 59 degrees, 
but the customer also reported that the some of other units did not fail 
had on board temperatures of 64 degrees. Why do some units fail with an on 
board temperature at around 59 degrees and others do not?

This customer is pro-active as he is using lower voltage power supplies and 
has applied heat sinks to the cards. What else can we do to solve this 
problem without the use of fans?

What is Karlnet doing to resolve these problems?

Thanks.

Michael R McDermott BEng (Comp. Eng.), MACS, IEEE
Pre-Sales Technical Consultant
Veritech Australia Pty Ltd
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