I can get it working with 24v PoE, but thats a big hassle as its a separate injector (so no control over power to reset, additional plug needed, etc) when I’d prefer to use the listed supported standard. I’ve tried powering from a Cisco switch, using multiple brands of PoE Injectors (to see if it wa…

You mean the RBTFC11: https://mikrotik.com/product/RBFTC11 ? By default it comes with an injector that is this one: https://mikrotik.com/product/RBGPOE That definitely uses mode B (4,5+/7,8-). In theory a 802.3af/at compliant PD should accept both Mode A and mode B (it is the PSE that decides …

In theory a 802.3af/at compliant PD should accept both Mode A and mode B (it is the PSE that decides on which pins to apply power). Your Cisco most probably uses mode A (1,2+/3,6-). It is possible that either the thingy is not fully 802.3af/at compatible or that (for whatever reasons) it is defe…

Yup. Product page says Unit has 12-57V PoE with 802.3af/at support (> with > unshielded > cross cable> ) (emphasis is mine) In addition to emphasis, can you also translate from Mikrotikish? What (the heck) is a cross cable? Does it mean cross_over_ ? But in crossover cables the 4,5,7,8 u…

Yup. Product page says (emphasis is mine) In addition to emphasis, can you also translate from Mikrotikish? What (the heck) is a cross cable? I’ve no idea … perhaps @OP should ask MT support directly (and post their answer here, it should be interesting).

Only to keep things as together as possible: http://forum.mikrotik.com/t/rbftc11-crossover-cable-to-power-from-802-3at-poe-half-crossed-or-fully-crossed/165256/1 It seems like “cross” translated from Mikrotikish means crossover (maybe).

Mikrotik Support asked what kind of Injector I was using and followed up with “Try with a crossover cable” (“crossover” was the term they used, not “cross” so I think that points to that meaning, unless Support is just as confused as we are about the terminology in place). I’m not able to do that fo…

User qupada just confirmed that a crossover cable works with his device, so the issue is about polarity of Mode A: [image] RBFTC11: crossover cable to power from 802.3at POE (half-crossed or fully-crossed?) MikroTik hardware general Since all of the threads on …

RTFC11: how to power with PoE 802.11at/af?

Hardware MikroTik hardware general

jaclaz September 7, 2026, 3:34pm 8

User qupada just confirmed that a crossover cable works with his device, so the issue is about polarity of Mode A: