Just connected 11 wap-ac to a new Dlink DGS1210-28p

Connecting one AP per time until 9 of them are up , at tenth PoE goes down on 4 ports ( it seems there are a "PoE grouping" each 4 ports 1-4 5-8 9-12 and so on...)
As dlink power budget is 193w we are under power treshold.
If I reboot the switch with all access point connected , none of them power up !!!
I have to disconnect them and reconnect each one at time.

Tried all various per-port PoE config on switch
Tried three different firmware on Dlink switch
Tried another identical switch, same issue

wap-ac and switch are both 802.3at compliant (from their datasheets)

I'm stuck on this now, any suggestion please ?

PoE Capable Ports
• DGS-1210-28P:
• Ports 1 to 4: Up to 30W (802.3at)
• Ports 5 to 24: Up to 15.4W (802.3af)

PoE Power Budget
• DGS-1210-28P: Max. 193W

wAP ac Max Power consumption 12W
9x12w=108W

i would suggest to fill the 1-4 ports and the other 5 port 5 10 15 20 24.
it might be that any wAP ac unit is sucking more power than declared or most probably this dlink switch can't handle them correctly once a certain power load is reached(in other words a crappy switch).

You're right with DGS1210-28P specifications

The problem. absurd, is exactly started on the first four ports :

I was connecting WAP-AC sequentially on this port order:

1-2-3
5-6-7
9-10-11

all ok, 9 AP up and running
I have connected the tenth one on port 4 and this first group (claimed capable of 30W each port) collapsed
The same connecting the fourth of each group and.....no way to make them alive again disconnecting one of them

A switch reset produces none !! all is dead unless I remove all access point and start to connect one by one randomly....

WAP-AC is declared 12W maximum , 802.3at capable

One interesting test that I've done : all of 11 WAP-AC connected, plus a cisco wap4400n, a netgear dualband (don't remember model) and an unknow poe ap (probably a small ubiquiti)
Power off then power on the switch , well...all WAP-AC dead and the other different ones immediately up and running .........still a switch issue ??

Any thougth or suggestion from MT guys please ??

P.S. Does routerOS version affect PoE behaviour ? all of them are 6.38.5

Power off then power on the switch , well...all WAP-AC dead and the other different ones immediately up and running .........still a switch issue ??

Any thougth or suggestion from MT guys please ??

P.S. Does routerOS version affect PoE behaviour ? all of them are 6.38.5

you can try and downgrade
viewtopic.php?f=21&t=116357&p=591251&hilit=poe#p591251

So, it seems ROS version affects PoE.....

Any suggested version ??

Some 6.39rc or pre 6.38.5 ??

I have 4 wAP ac running 6.39rc49 because of this:

*) wAP ac - improved 2.4GHz wireless performance;

Otherwise, I suggest you sticking to the bugfix channel, which currently means 6.37.5.

Today I've tried 6.37.5 as well as 6.39rc58

Nothing is changed in behaviour.....

I would put the blame on switches malfunctioning, but other brands access-points power up at first shot regardless switches firmware.....

Has anybody tried wap-ac with Dlink DGS series yet ??

Being sure it is an uncompatibility between machines , it would be nice if alerted somewhere in future i.e. https://wiki.mikrotik.com/index.php?tit ... lity_table

Have you tried switching cables? Are you using shielded ones?

Already tried to switch them
All cables are unshielded
All cables are CAT5e ! I hope this couldn't be the culprit !!!
Anyway , for each single AP/cable , it powers up correctly , the problem is after some number of them is connected.

Perhaps wap-ac are near to 802.3af Class3 limit :
POE Power Class 3
PSE Power available 15.4W
Max device power 12.95W

However as said , the issue exists also for the switch first 4 ports , capable of 30W (Class4)
Then, it's weird, also the four connected to these first 4 ports do not power up at switch power cycle (pulling off mains cable)

sometimes wAP dont like shielded cables when powered from certain poe devices, but since you are using unshielded cables this doesn't seam the case.
I guess the switch is crappy and it cant manage the load requested on all port groups. Once you connect the 4-th wAP something drops below the limit level, it might be current or voltage. The only way to find out is to use an Inline POE Analyzer and see what really happens to this values I/V

At this point , the only reasonable choice is to make tests with a different brand/model switch.......

According to DGS-1210 manual you can see total power consumed and power available in the switch interface interface ( ftp://ftp.dlinkla.com/pub/DGS-1210-20/D ... 00(WW).pdf , pages 78-80).
Can tell what you see when you connect 8 wap-ac devices?
How much power is consumed and how much is available? Maybe there is custom power budget set?

Power budget is set to maximum (193w)

Now I have 11 wap-ac connected to the switch but only four active :

System Power Status
Total PoE Power Budget 193
Power Used 20.5
Power Left 172.5
The percentage of system power supplied 10.6%

But the remaining seven don't want to start..... unless unplug them and reconnect one by one but there's one point where they shutdown again.....

The weird thing is the four PoE ports where active AP are connected, are listed as "UP 1000Mb Full" but in the relative PoE port status page only two are displayed as "PowerON" with voltage,current and power drawn by AP , all the other "Power OFF" !!!!!

Switch issue ??? Probably but a week ago this switch was running by years : two Cisco WAP4410N, two Netgear WNDAP360, eigth Dlink DWL2200AP and one Ubiquiti .....

Now a wap-ac question : are they PoE "smart" or "stupid" devices ??
I mean, they can be supplied by passive injectors 11 to 57V , so they "eat all you give them" , it makes me think they don't have a "smart" poe circuit as other devices have
They are seen as a "passive" device by the switch supplying them , can this be the cause of switch malfunctioning ??

Are all the patch-cables the same (All the pach cables "regular" or "cross-over")?
I once had a problem with short-circuit "random-magic" caused by bad/incorrect patch cable. I tried different APs and even different poe-switch, but problem persisted because of that bad cable that I randomly re-used. Problem was solved by a colleague who just took 16 brand new regular patch-cables and problem disappeared.

Power Used 20.5

The weird thing is the four PoE ports where active AP are connected, are listed as "UP 1000Mb Full" but in the relative PoE port status page only two are displayed as "PowerON" with voltage,current and power drawn by AP , all the other "Power OFF" !!!!!

How much power does it show for those powered ports? Does it adds up to 20W? If no, then somehow current is flowing in a unexpected way...

All patch cables are new "straight" cat6
All palace cabling system was the previous used by other brand/model working access points (I just replaced the APs)
As said, there is a strange behaviour on display active poe ports on switch maintenance page

How much power does it show for those powered ports? Does it adds up to 20W? If no, then somehow current is flowing in a unexpected way...

The sum of the active poe ports is equal to power displayed in poe summary
Anyway an active wap draws 8-9 w (from DGS1210-28P poe ports settings) while it draws 4W if connected to another 802.3af switch (i.e.Dlink DES1316 or Linksys SRW224P) : DGS1210 misreading ??

I don't know if the total power load report is affordable at all....
Anyway, with four to eight running wap-ac we are well below 193W.....mystery keep going on.....

We had thi issue on HP 2520-24 POE switches with wAP AC's

Log a ticket with MT support...

Thanks,
How do you solved it ??
Is your issue still open ??

Just open a request to MT support, let's see if they can help me....

nz_monkey: is 2520-24 POE a gigabit switch ?

This make me think about this: my wap-ac work correctly if connected to a pair of 802.3af switches (des1316 and srw224P) here in my lab , but they are 10/100 switches and poe supply involves 1,2,3,6 pins (checked , they power up with only these pins)
Gigabit ports use all four pairs in the cable, but wap-ac use 4-5 7-8 pins ,instead, as "passive" supply method, the one given by native 24V power injector, so it seems wap-ac has a sort of "hybrid" method of "over ethernet" power supply (passive and 802.3xx indeed)
Could this be the cause of PoE "misunderstanding" when connected to a gigabit PoE switch ?

Is there anybody having a set of wap-ac woking connected directly to a gigabit PoE switch ?? Which brand/model eventually ??

Thanks

I have 2 WAP AC's functioning correctly on both a Netgear GS110TP(v1) and a Juniper EX2300C-12P (my current switch).
Both are gigabit switches.

Some way solved......

Replaced DGS1210-28P switch with DGS1100-26MP (where MP stands for Max PoE)

It has all ports 30W PoE capable ( 802.3at ) despite the fact wap-ac is a 12w max. device
Once connected to this switch they drawn from 4 to 8 W each but Dlink DGS1210-28P 802.3af gigabit switch go mad in understand which type of device is feeding.

I have my personal idea (perhaps wrong) :
all 8 RJ45 pins of wap-ac are used for PoE but pins 4-5,-7-8 are used also for "passive" or "stupid" 11V to 57V injector
this mess-up these switches PoE classification
then, for gigabit support, all eight wires are used to carrying both data and power
In fact a wap-ac connected to a 10/100 PoE switch or with a 1-2-3-6 cable to a GigaBit switch (thus running 100Mb/s) is correctly classified as "class2" device with a power consumption of about 4W !!

Hope it helps in choose the right PoE switch for these devices (and future hw/sw implementation of wap-ac by MT engineers)

Have you tried switching cables? Are you using shielded ones?

Hello all,

as newbie, may I ask you what exactly „use unshielded cables“ means, please ?

The IEEE-802.3at says:

• minimum Cat5e
  minimum ANSI/TIA/EIA-568-B.2 or -B.2-1 or -B2-10

Does it mean to use U/xTP cables only or does it mean even SF/xxx but the shield is not connected to the RJ45-plugs on the ends of the patch-cable ?

Many thanks for your help in advance !

Hello everyone, I'm not sure what is going on, I recently reset a D-link DSG-1210-28p switch and now poe won't work, what could be the issue?