I have confirmation from tp-link tech support: "If so, we support A. And it uses 1、2、3、6 line pair to supply power"

Yes I agree but there does seem to be an A and a B version. Anyway, as I have no definite answers I have returned the injector to the retailer. Thanks for your thoughts.

Its a Y-cam Black SD POE Many thanks

Region : UnitedKingdom Model : TL-POE150S Hardware Version : V3 Firmware Version : ISP : I am trying to determine whether I have a faulty TL-POE150S or whether it is incompatible with my y-cam POE...