Changes between Version 37 and Version 38 of poe

Timestamp:

11/30/2020 06:53:58 PM (4 years ago)

Author:

Tim Harvey

Comment:

added note about powering via Auxillary and active 802.3a PoE

poe

@@ -64 +64 @@
  - Newport GW640x/GW630x/GW620x
 
+== 802.3af and Auxillary power
+When powering a board with both 802.3af and Auxiliary power (ie Vin barrel jack) at the same time it is a common mistake to believe you can switch back from Auxiliary supply to PoE and use Auxiliary as some kind of back-up supply avoiding a power cycle.
+
+Most on-board 802.3af PoE controllers will drop their class negotiation with the PSE when not being used in order to conserve power budget. If this occurs this negotiation will need to be performed again if Auxiliary power goes away and the board will power cycle.
+
 
 [=#half-rectified]