I’ve recently deployed a wireless wire pair composed of 2 wAP60G and the results are quite good. There’s an issue, however, after resetting the link it delivers bandwidth tests of around 1Gbps half duplex, but after some time (around 15 minutes) it drops to 250Mbps. That performance is acceptable, but I don’t know if there’s anything wrong with the setup, and getting the full bandwidth is always a plus. Both sides have been thoroughly aligned in all axes, the distance is under 125m, weather is good, relative humidity is under 70%, there are no warning or error entries in the log and after enabling and disabling the built in alignment utility (which I guess resets the link) I can consistently achieve SMB transfers between 50 and 75 MB/s which is a net throughput of between 400Mbps and 600Mbps, taking into account the overhead of the SMB protocol it’s much higher than the later 250Mbps results. My only conclusion is that maybe an abnormally high error rate is detected and the link switches to an alternate bitrate mode. Has anybody experienced anything like this? Should I look into anything in particular to address this issue, or it’s just normal and I should just leave it like that?
Thanks for your reply, I did in fact write an script to log monitoring results every minute and the problem improved slightly after switching frequencies, although scan showed nothing in the channel in question, here are the results:
The rssi is always between -57 and -60, however there are signal quality drops and spikes in tx error rate whenever the phy jumps from 1155Mbps to 1540Mbps. My only guess is that there’s some sort of interference or that the tx power is unsifficient, either because atmospheric attenuation or some obstacle lying in the fresnel zone. I’ve found no way to control the tx power with the current firmware, may for stability’s shake I should try to find a way to cap the MCS to 4 and stick with 1155Mbps which is plenty.
Thanks for your comments and thanks in advance to anyone who might provide other thoughts.
Indeed there are plenty surfaces and antenna masts around and between both devices, I’ll try to get pictures of the setup and surroundings, however access isn’t easy, so I can’t post them right away.
