Hi, We’re just testing our first B24 link and hoping to put into production this week. I have been noticing several fluctuations in watching the web interfaces and wondering if I’m seeing interference or possibly have an alignment issue. Any comments/questions welcome. The link is about 1.2 KM long, one radio on a roof mount at valley bottom where we connect to fiber, one about fifty feet up on a tower with clean line of site where we do our distribution from. Main signal reading is about -57 on each side. I’m running at 2x40MHz channels as the throughput on the 2x80MHz seemed worse.
- The upload direction of the link’s capacity and speed is showing much better than the download’s:
PHY Tx/Rx (Mbps): 480 / 800
MAC Tx/Rx (Mbps): 288 / 480
- The odd time I see one of the MIMO streams drop off
- I see the link length estimate jump to 6000km once in a while
- Normally the PER stays below 2% but the odd time on the download side it jumps to 5 or 10% briefly
- EVR seems OK - typically above -25 although some of the streams drop to below -20 occasionally
- The SNR of the streams is 25-30 on the tower (download) side and 30 on the valley side.
On the tower itself there is a lot of our 5.8GHz Cambium gear and some radio antennas for the local fire department and trucking company. We are in a small town a fair ways out in the country. Looking at the spectrum analyzer for the link we see lower than -90 for noise.
Numbers looked a bit better yesterday when it was a clearer day, today is a bit cloudier. I was pulling about 430Mbps download and 480Mbps upload when directly connected to the router at the tower yesterday. This matched up about with the MAC rate at the time so I think the link is working OK.
I’ve watched the aiming videos and I think I have the alignment good. Right now there is minimal traffic going through the link but I’m running out of time on testing, getting lots of pressure to bring it live as currently we are not adding new subscribers at this tower.
So wondering if these are just normal signal variations at this distance and I shouldn’t worry too much about watching the real time data, just trend things over time and go from there? Or would any of this possibly indicate an alignment or interference problem? Or does the link need to be under more of a load for accurate stats?
Thanks for your time all.