In MikroTik, that setting is referred to as HT Guard Interval and its on the HT tab. If you are still having problems, post your wireless settings. HT Guard Interval: SGI 400ns, LGI 800ns. it's no relation with greenfield. the greenfield is relative frame information. if set to greenfield the frame...

I had set 802.11n only in MT router, My two phones TX(MT side) can't reach 65M or 72M. and never see 802.11n rate. please look at below picture http://1drv.ms/1jvP0VG https://pqzsgw.dm2301.livefilestore.com/y2pm9xr6qQlQ-k56O9LC92Qoh39gtYBLRndTXjYE8AWGEUwiMzppkPnvG6PVGPkepSqjVm35R7jFwnn1ghXRLz1aClMOG...

if the device can operate normally, for example, at MCS15 then it can easy try to jump from 270mbps to 300mbps. Maybe, but this doesn't apply on lower rates. Why sacrifice 11% of true throughput when a simple standard setting supported by every descent wlan device (including all 802.11n Atheros) co...