Again on WAP-AC PoE requirement

RouterOS Wireless Networking
1

I’m still stuck and confused on PoE power requirement of wap-ac

specifications say :

PoE in 802.3af/at

Some 802.3af switches can easily handle them, where other ones fail

When running , wap-ac draws a ridiculos 4to8W any af PoE should be capable of…

Nobody has been able to tell me if PoE budget handshake is a software or hardware issue

Any idea ?

2

If other vendor PoE-OUT product is used to power up this device, then unshielded cable might be required.
https://wiki.mikrotik.com/wiki/Manual:TOC/MikroTik_POE_in_compatibility_table

3

Mikrotik devices simply are NOT fully 802.11af/at compliant.

They might be compatible to some switches, yes.
But they lack the support of all requirements.

It seems they are missing galvanic isolation.

4

wAP ac is an older product. New products are fully compatible.

5

Can we get details on which devices are “partialy” and which are “fully” compatible? At the moment it seems almost like a dice roll. (I am aware of https://wiki.mikrotik.com/wiki/Manual:TOC/MikroTik_POE_in_compatibility_table but thats just 15 randomly picked switches while there are hundreds on the market)

Also specifics on supported modes (not modeLs) would be lovely. For example I noticed that mAP/cAP Lite require crossover cable to work with (1,2+)(3,6-) while DynaDish 5, CRS109 and CRS210 require crossover cable to work with (1,2-)(3,6+).
This is not specified but it is obvious from POE compatibility table.

I believe it would be best for everyone to make a compatibility table on wiki, which will list every poe-in device and its supported modes instead of compatible switches.

  • It will make your life easier as you don’t have to test devices and write results on wiki (just current table means almost 200 tests and that does not even cover all your range)
  • Also, it will make customers happier because they know what they are buying and there will be no hidden surprises. Currently, we have no chance to know, if device will or will not work, unless we have one of those 15 tested switches.



Do you even electric? :slight_smile: Galvanic isolation is broad term for anything what physically isolates two circuits while maintaining signal transmission between them. For example every gbit poe port must have galvanic isolation to separate power from signal which goes through same wires.

6

Ummm, yeah…
Since we discussed PoE, I strictly referred to the power.
I am fuly aware the Ethernet requires transformers - which do galvanic isolation - to do the signal coupling.

Regarding 802.11af/at I think that a device MUST also use galvanic isolation for the 48VDC power conversion. To my knowledge there is no Mikrotik product that does this.

See this old thread:

7

What do you mean for “new products” that can be compared in performances to wap-ac ? perhaps cap-ac ? or wsAP-ac lite ?

8

Hi, I need a little info: my wAP ac is connected to a hEX PoE. The wAP is powerd only if the setting of Poe on hAP port is setted up to “forced on”. With “auto on” it does not work. Reason?

Thanks, Simone