I am looking to purchase some PoE cameras. The camera description specifically states that they require power to be delivered on the data pairs (1,2,3,6), which indicates PoE standard 802.3af Alternative A. (see https://en.wikipedia.org/wiki/Power_over_Ethernet for description of A vs. B)
Shopping for PoE injectors, most of them state "802.3af compliant". However, very few state whether power is provided on the unused pairs or on the data pairs.
Is it safe to assume that if the device is 802.3af compliant, it will support either Alternative?
Otherwise, how can I be sure an injector will work with these devices unless I specifically ask the mfgr?
For example, this injector specifically states that data are on 1,2,3,6 and power are on 4,5,7,8, so I assume it will NOT work.
But I've found none which state that power is sent on 1,2,3,6, or which can do both.
So should I assume if it's 802.3af compliant, it will "just work"?