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Subject: Signal ground and chassis ground

Date: 08/22/01 at 5:35 PM
Posted by: Rajendra Pokharna
E-mail: rpokharna@corvis.com
Message Posted:

In Reply to: Re: Signal ground and chassis ground posted by Bhooshan Urva on 06/02/01 at 12:12 PM:

Hello,There is a DC-DC converter in each plugin card.The ground reference (signal ground) of each of these outputs are connected together through the backplane. However, I have seen various schemes used for connecting the signal ground to the chassis ground, i.e. through a 1Meg Ohmresistor, a ferrite bead, etc. I am not sure about the reason for this. I agree that the signal ground is noisy. But why not make a solid connection between that noisy ground and the chassis. Is that an EMC issue or a safetyissue?Thanks./Rajendra


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