Hi, I have a RB532 + SR2 + 2.9.8 AP with 2 clients with 2.8.26, one is connected at 54G atheros CM9 and the other with 11B prism2.5 the one with 54g have no problems, the other one is connected at 11 mbps down but only 1 mbps upload with timeouts problems.

The strange thing is when I set the cm9 one to 802b, have the same behavior of 11 down 1 mbps up and timeout problems, I have checked the basic rates and supported rates.

Both links are on 1 km distance with -49/50 signal strength. also what are the expected ping replys for a 1km link with -50 signal strenght?

Try to set SR2 to B only, not to B/G. There are discussions on this forum about B/G mode problems, check that out.