Good Values - Poor Performance

RouterOS Wireless Networking
1

Hi all,
in a quite simple scenario, i’ve something that i can not solve…

  • There are a couple of Radio Bridge (912UAG-5HPnD and 711GA-5HnD) both with 24 dBi
  • Distance is less than 2 km

Values 5 month after the installation:

  • TX Signal Strength -59 dBm
  • RX Signal Strength -60 dBm
  • TX CCQ 90%
  • RX CCQ 94%
  • Signal To Noise 51 dB
  • Bandwidth test (From the Bridge)??? TX Less than 4 Mbps, RX 20 Mbps

Well, channels are quite busy, but with those values i aspect greater performance.. am i wrong?

At the beginning of the installation, we had about 100 Mbps in RX and 75 Mps in TX.

I’ve factory resetted and reconfigured, changed frequency, Channel width, .. , .. , .
Do you think there is something broken?
Can you help me trying to understand what happened..

Thanks in advance,

D
Cattura.JPG

2

Hi,

Try to set the wireless protocol to nstream to see if your performance is still the same.

Something else to check is that both boards are connecting @100Mbps on the ethernet.

3

Hi,
thank you for answering.
I’ve force ethernet at 100 Mbps… thant i’ve force to 1Gbps.. but nothing.
I’ve force using all the protocols, but nothing.
Just for troubleshooting, I’ve also tried a Bandwidth Test between WLAN’s interface, disabling both bridges…

At the moment, i’ve no more ideas…

D

4

Both are dual channel n capable radios. They should be linked at 300mbits. It’s not clear whether they stay on g only or not from your picture. Check it and the relevant config on both sides. Also don’t run btest on the devices you are testing. It drains cpu and has other performance problems itself. Check the antenna alignment. Run spectral scan on both sides and select the best frequency.

5

Test various frequencies, that is in allowed range, offc. Did you tried using NV2 wireless protocol?

6

You have only one chain activated on both devices.
Ch1 has no signal.

7

Hi,
thank you all.

I’ve tried using 802.11 standard only, nv2 only, nstream only… but no results.
I’ve tried using “only n” standard hoping that this modulation could improve physical limitation of “802.11a only” situation, but nothing changed.
I’ve seen that ch1 was much more used thank ch0, so i’ve tried using only ch0.

Before of that, i’ve done a spectrum scan: it is truth, quite all channels are (more or less) busy, but don’t you think that with those values, even if some channels are busy, i should have better performance?

Maybe there is an hardware problem.. I’ve to consider a replacement?

Thanks in advance,

D

8

Everywhere the band is busy. The both sides spectral scan should tell you what frequency and width you are able to use.

Physics goes first, miracles by modulation afterwards. So. Make sure you use shielded boxes and very narrow antennas with good side/back shielding too. If you are catching interference, you will have always problems.

9

Hi all,
finally i had a the solution.
Customer installed installed a Video IP intercom that generate useless multicast traffic that caused problem with mikrotik’s bridge interface.
I’ve applied an ACL that drop multicast, and now everything works properly.
Hope this will help.

dstncl