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Purpose of shielding in ethernet cables?

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themaccabee

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Hi,

I've seen many products in industrial environment using shielded RJ45 cables for communications such as Ethernet/CAN etc.

can anyone tell me the precise reasons for using shield earth in the same?Does the following has any thing to do with it?

1) protection against surge/EFT for data transfer
2) providing a ground reference between two communication modules
3) Improving Radiated Emissions performance

Thanks & Regards
 

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