Powering TP Link TL-WA5210G using Mikrotik RB750UP

RouterOS Beginner Basics
1

Hello dear experts,

I am trying to hook up a TPLINK TL-WA5210G to a RB750UP using its POE out functionality.

Ultimate goal is to power 2xWA5210G + 1 UBNT Nanostation Loco + 1 Mikrotik SXT using POE out function of RB750UP in a multi wan setup.

Running into trouble:

750UP fails EVERY TIME the WA5210G is connected on a POE Out port using Mikrotik PSU.

I did additional tests. I share them below in the hope that it may help resolving this issue:

  1. Using factory provided PSU for 750UP rated at 24v, 2.4A to power 750UP

When I plug the WA5210G CPE, all leds starts blinking crazy and the router fails.
Tried to change POE setting from auto to forced, no luck.
Tried on all ports 2-5 same result: all leds go crazy and the 750UP switch fails.
Tried to turn off POE except on one port before plugging CPE WA5210G, it fails.
Tried changing ether1-poe-in-long-cable setting from no (default) to yes, it fails.
Tried 10 different LAN cables, same result, it fails.


2) The 750UP POE Out works well when hooked to UBNT Nanostation Loco M2 + Mikrotik SXT using Mikrotik factory PSU (exact same unit as above, 24v 2.4A)
As soon as I hook up a WA5210G CPE, all leds start blinking crazy again and router fails.

  1. The TPLINK CPE works well using its own factory provided POE injector (PSU rated at output 12v 1A)

  2. Tried powering 750UP using the TPLink injector and PSU (12v 1A)
    The RB750UP powers up fine and provides juice to TWO WA5210G on all ports 2-5. POE monitor shows around 10V 300mA and 3.5 W for each.
    However this setup does to not work with 1 or 2 additional CPEs.
    The router does not fail, howerver all CPEs start rebooting randomly (not enough power from PSU I suppose?).

My tentative conclusion:

It seems the problem can be narrowed down to a single WA5210G not working at all with 750UP POE out feature using factory Mikrotik PSU.

Could you please advise as to powering One TP Link CPE with 750UP POE Out using factory provided PSU (Point 1 above)?


Thanks in advance for your kind feedback.

PS: all items are brand new, and were delivered a few days ago.
All Ethernet cables length below 2 meters max.

2

Seems that your TPLink does not appreciate 24V input. I couldn’t find on the datasheet the voltage specifications for it, but it could be the culprit.
You may try to use a 12V power supply for your RB750 that can deliver more than 1A as all your other devices together will need much more than that @12V.
Or you can forget the POE function for the TPLink, and add the TPlink injector between the RB750 and TPlink to power only that part of the network.

3

What is the voltage from the Original power supply from the tplink? and
how match AMP.

4

tplink works at 12v and has an overvoltage protection.
Also you can not power one RB750UP and several more radios with just 12v/1A. Use a biger power supply.

5

I do not have such a good experience with the rb750UP.
I connected 3 nanostations M2 and the router board did weird, the nano drives went on and off.
However, I am satisfied from all other mikrotik routers that i have
The power over ethernet output has the same voltage of the router board, normally 24 volt, the TP-link would also have to support 24 volt or it does not work.
Try it with a 12 volt power supply 3 amp.

6

use a xxxV to 12V converter.

7

Hello,

Thank you all for your input.
After reading your posts, I did some more research on the internet.

According to a russian forum specialized on the WA5210G, this CPE is equipped with a RT8270 asynchronous high voltage buck converter that can support an input voltage range from 4.75V to 22V.

That seems indeed to be the culprit.

Will try a new PSU as suggested and report back for future reference.

Thanks again.

8

Hello all,

Just tried a brand new PSU with output rated at 12V 3A.

Everything seems to be powering up nicely.

Marking as solved.

Thank you all :smiley:

9

Good luck

10

TP-Link mostly use this DC/DC converter http://www.chungda.com/Images/Upload/AZ34063U%20D1.2%20100319.pdf = you can use any voltage from 6.0V to 36.0V (according to amperage and power consumption)