guys,
what can be considered a good signal to noise relation?
here I have one access point with client’s signal to noise rounding -26db.
in another AP i have clients with -7db!!!.. but client’s CCQ is ~78%
on this one, the noise floor is -86 dbm, sould us try another channel???
mikrotik versions 2.9.44 and 2.9.46
routerboards with 2.4Ghz mini/pci cards
thanks for any post,
gabriel
gabriellauter -
Normally you’d like to see about -20db signal to noise ratio. I have seen lower levels that work, like in your case… If it were me I would look at another channel or two and see if you can get a better S/N ratio.
Around 20dB SNR or better should get you close to the maximum air data rate - depends how much you are pushing through the connection. A lower SNR will mean a lower data rate will be selected.
eg:
Is signal to noise expressed as - or + value?
Here’s the average value of one of the SU:
Signal Strength -69 dBm
TX Signal Strength -71 dBm
Signal to Noise 30 dB
Tx/Rx CCQ 45/55%
At this moment, the link of SU to AP is still quite good and the througput is between 1 - 3 Mbps average.
Can anyone try to explain whether this value is good enough to sustain a reliable connection?
If not, what should we improve?
Your snr is just fine. But your CCQ is terrible. Try another channel. CCQ should be above 75% and the closer to 100% the better.
If you don’t see any improvement in CCQ on other channels then you probably do not have clear enough LOS.
Tom
SNR is + value
a - value means you are in the noise floor.
If your CCQ is not good, then as roc-noc.com said, your LOS is probably no good. You could be picking up a reflected indirect signal, multipath interference, or there is a partial obstruction in the path.
how did u calculated the throughput of AP and SU.?
Hi there is 42db signal to noise to loud? I managed to reduce tx power on some link to make signal to noise between 19 and 30.
What is the highest that signal noise can be before it is considered as shouting.
cheers
Any s/n above 20 is good. But if the value becomes very big (30, 40 or even more) this only means the signal itself is very strong. Signals stronger than -40dB should be avoided. Lower could even lead to damage to the reciever.
In areas with many radio signals and many multipath reciept, if all transmitters are sending with too much power than actually needed you create high noise levels and more interferences. By lowering outputs of radios you smoothen this so go low as long as your s/n doesn’t fall below mentioned 20.
Hello, and sorry to bring this up again.
I bought a new wireless adapte for my desktop and my SNR is 57db.
Im about 10 metres away from my tik with 2 doors between.
Should i lower the strength signal of my adapter?