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[802.3ae_Serial] 12 dB return loss for transmitter?

Dave Kabal, Dubravko and I were discussing the 12 dB return loss spec in Table 52-12.
 
What is it? Is this return loss looking back into the transmitter port from outside, or is it tolerance to return loss of the cable plant and receiver combination?
 
If the former, what is the technical reasoning? If the latter, it should at least be renamed or more preferably removed.

Thanks, Tom
Stratos NW
425/672-8035 x105

 
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