@zapatistal, AFAIK the built-in iperf can't be used externally. Maybe it's a customized version.

But why would you want to use this? I use an external iperf3 if I want to fiddle with parameters or measure throughput of the wireless link from LAN to LAN. I use the built-in iperf only for measuring pure wireless throughput to proof an optimal antenna alignment.

zapatistal wrote

Thanks for the interest.

 

I am just trying to understand where the bottleneck is and why the router at the right end cannot exceed 25 Mbps. That is why I am trying to iperf the CPE's individually to understand where the bottleneck could be.

Throughput between the CPEs should be ~210 Mbps (that's 300 Mbps pure WiFi rate - 30% overhead in 802.11n-only mode) in unidirectional direction with built-in iperf. If you reach only 90 Mbps it might be caused by not properly aligned antennas or by WiFi settings such as MAXtream set to on.

Did you use the antenna alignment tool built into the CPEs to align the antennas? CPE610 has a very narrow antenna beamwidth of 9º H / 7º E, so it's kind of a challenge to align the antenna properly.

@zapatistal, signal strength for H polarized antenna looks very good, but for V polarized antenna it's acceptable only.

However, you did set Test mode. You should set your country as region, not Test mode.