FreeLists / si-list / [SI-LIST] Gigabit ethernet compliance asymmetry test

[ruston_matt@xxxxxxx]

All:
 

 Hi. I was wondering if anyone on this list knows what the purpose of
this compliance test for gigabit ethernet is. The test is the peak
voltage asymmetry test for points "A" and "B"; they must match their
peak voltage amplitudes to within 1%.

 

 How does measuring this asymmetry come into play (i.e. how does the
symmetry affect my system in tangible terms)? If I have 1.5% asymmetry,
does it shorten my maximum cable length and by what magnitude? How about
2% asymmetry? Does it increase my BER and by how much. What mechanisms
are at work here? Or is this a test that has very little meaning on the
functioning of a gigabit Ethernet link?

 

Any insight/help is appreciated.

 

Regards,

 

Matt


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