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Clay, I would prefer to separate the L2 classification from the L1. After the link comes up, an atPSE will start sending OAM frames, similarly an atPD will start sending OAM frames. In both cases, receipt of OAM frames indicates that L2 classification is in progress. There is no reason that an afPD or an afPSE could not receive a firmware upgrade to support L2 classification conforming to .3at. Hugh. Clay Stanford (LTC) wrote: QUESTION:In slide 4, when atPSE sees 1-1, 2-2, etc, the atPSE assumes an afPD. But if an atPD wanted, for example, to request 3.84W, does the atPD use the class 1-1? In that case how does the atPSE know that the PD is an atPD and not an afPD?ANSWER: Yes, an .atPD that wants 3.84, 6.49, or 12.95W would use 1-1, 2-2, or 3-3 respectively. In this case, the .atPSE does not know the .atPD is in fact an .atPD. It thinks it is an .afPD. (The .atPD does know the PSE is an .atPSE.) Subsequently, if the .atPSE desires to use layer 2 classificaiton, it would need to poll the PD to see if it responds. (Alternately, the .atPD could announce to the PSE that it is an .atPD.) clay __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com |