I know that as temperature increases, so does the resistivity. Doing a quick and rough calculation, the resistivity of copper increases a little more than 10% when going from 0 C to 25 C and about the same going from 25 C to 55 C. I've attached a one slide PDF of the insertion loss of a measured calibration trace at various temperatures and you can see a similar trend.
The reason for the failure due to the raw cable and also the reason why it only shows up in differential to common-mode conversion loss is because that specific channel in the raw cable has high mode conversion.
Best Regards,
Signal Integrity Engineer
Advanced Engineering
FCI USA LLC
On Wed, Sep 2, 2015 at 12:34 PM, Mike Andrewartha <Mike.Andrewartha@xxxxxxxxxxxxx> wrote:
Hi folks,
Relative to the data presented in zambell_090215_25GE_adhoc-v2 is there a well known explanation for the variation in loss with temperature? This was new to me.
Also, could you provide more explanation about the “failure due to raw cable” note on slide 24 & 25? What was the nature of the failure and why do the effects only show up in the differential common-mode conversion loss?
Thanks,
Mike
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Mike Andrewartha
Principal Hardware Engineer
Cloud Server Infrastructure Engineering
