Can anyone define exactly how RSSI imbalance is being calculated?
On what radios and where in the GUI are you seeing this value being displayed? I looked around a bit and can’t seem to find this in PMP450 or ePMP radios.
I would imagine that this value reports the individual RSSI levels of each RF stream or the delta between RSSI on each RF stream.
This is in the SM performance page. These SMs are connected to the PMP450 radios
OH, are you referring to the performance page in cnMaestro? I’m showing that it has a “DL RSSI imbalance” graph:
This graph just shows the delta, in dB, between the two RF chains.
So just the difference between the two MIMO chains? A 5dB difference seems a bit excessive…
In my case, I retuned a 40Mhz channel and saw a step function “down” by about 3dB. I would understand an overall RSSI step function post retune, but wouldn’t necessarily expect an increased delta on the 2 MIMO receive paths…
In the example I posted above, which shows an up to 5dB delta between chains, this is a NLOS 3GHz link. Swings like this are to be expected on challenging paths especially as conditions change due to trees swaying, moisture on the leaves, and the type of tree (pine trees are the worst).
Having an imbalance of 1-3dB is pretty normal. Anything more then that and you’d probably want to visit the SM and check to see if it’s misaligned or something is obstructing its path.
1 Like