D-link DIR655 router. Intel 5100 in a Dell Studio 17 lap top running Vista 64. The router is set up to run a/b/g/n but adapter will not run any faster than 54 Mbps. If I set the router for "N only" the 5100 will not connect (as expected given the 54 Mbps). I worked with D-Link support, and after going through gyrations and setup, said the problem is with the network adapter. Dell support could not identify the problem and told me to update the router's firmware which was up to date. The device driver version for the adapter is 18.104.22.168 and Windows says it is up to date.
One interesting point: When I go to the 5100 "device manager" - advance tab - wireless mode, option 6. is 802.11a/b/g. "n" is not included in any of the options. Does enabling the "820.11n" Mode override this setting? The mode for the router is "mixed a/b/g/n." This is the only glaring issue that I have found with either the router or the adapter and suspect this is where the problem is.
are you sure you have a version that support N? Not all Wifi Link 5100 Cards support it. Some only work as ABG I would check with your manufacturer to make sure you have the correct N version.
You can check which 5100 adapter you actually have by poping the cover over your NIC and reading the lable, or with the Intel Wireless Lan ID Utility http://downloadcenter.intel.com/detail_desc.aspx?Agr=Y&DwnldID=8061&ProductID=1784
Also, on these cards, Draft-N speeds are only obtained with WPA2-AES security. http://www.intel.com/support/wireless/wlan/sb/CS-025393.htm
The card is a 512AN-HMW; D p/n OCY256.
I will not connect if router is set to "N" only.
I realize the easiest way to solve the problem is to lug the computer to a cyber cafe which is a "N" hot spot but frankly the problem should not be that difficult. As usual D-Link support blames the adapter, Dell support says it is the router (they did not supply) and I am waiting for Intel to get back to me (I escalated after reading the suggested docs with no change in the result).
Security is set to WPA2-PERS AES for the card per the documentation and WAP/WPA2 AES on the router (required because 2 other lap tops with g cards will connect on WPA but not WPA2).
Enabling AES is the thing to do, as I already read on other forums. So far, I don´t know how. I got a ThinkPad SL510 with a Intel WiFi Link 1000 running Windows 7 Home Premium and a D-Link DIR-615 router. I can enable it in the router settings, but I can´t figure out a way to enbale it at the client. There is a error diagnosis program from Lenovo, that say, the adapter uses TKIP, but no hint how to change it. I already switched all options in the device manager I found, but no trace of AES setting. I also installed Intel PROSet/Wireless, with the result, that I got no connection at all.
Somebody got a hint?