i used atheros 5211 with routerOS 2.8.11 and connect to atheros 5213 with routerOS 2.8.26
Using band 5 Ghz. The distance between those two radio are 7 km.
basic-rates-a/g=6Mbps,9Mbps for the two site.
When i used the bandwidth-test, i have total traffic up/down around 6Mbps.
The ping between those two are ok. Around 20 ms.
But the problem begin when i connect those two site with real traffic, which has traffic arround 4 Mbps. The ping are increase until 200 ms.
What is the problem ? It's only 4 Mbps traffic, still under 6 Mbps.