[SI-LIST] Chassis ground

I know most SI engineers work at the board level but I am often asked if
digital signal ground should be connected to the chassis ground at the board
(normally through standoffs). It seems to me that the chassis would be a
very high impedance signal path so in effect only DC currents would flow
thus becoming part of the power supply return.  Is there any advantage to
keeping the chassis ground isolated from digital ground and connecting them
at a single point with the green AC wire? I'm asking from the point of view
of reducing EMI.

I'm talking about your typical high speed digital systems with multiple
boards in a large chassis. Also, assume no conductive connections to the
outside world (optical only, or unshielded Ethernet).



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