I got a Thinkpad T410i notebook, which use Intel 6200 wireless card, when I connect to my router(Cisco E3000, configure as 2.4G 40Mhz, 400ns guard interval/short gi ), the link speed is 150M, not 300M. what's the problem?
Hello michael-y1, sorry to hear that you are experiencing trouble with your wireless adapter. The connection speed/range and throughput depends on a lot of variables, mostly how it was integrated, since a specific amount of resources are made available for the port, antennas are installed and a customized hardware. The Intel® Centrino® Advanced-N 6200 maximum theoretical speed is 300Mbps while the Intel® Centrino® Ultimate 6300 is capable of 450mbps.
You may check the link below for additional information and Troubleshooting, (if you haven’t already)