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Guys, As you all know, we’re planning to run current from
the endspan thru the midspan in a 4P system. Although I think its unlikely that we’ll see
Af-midspans with fused traces or delaminated boards, technically we can’t
prove that it won’t happen because 802.3af doesn’t specify a min
current rating for this path. There seems to be no max limit for dc resistance
either. (If these specs are in 802.3af and I’ve missed them, then
someone please point me to the applicable table or paragraph.) We should make sure 802.3at specifies both these parameters.
(But only for midspans that output >15.4W so we’re not
retroactively putting new requirements on Af-midspans.) Any comments? Steve |