We had a wireless network installed a few years ago which the support has now lapsed on. We are having a number of issues with throughput...
Managed with Cisco WCS
Our G devices report to be connecting at 54G, tests with iperf show throughput of ~16Mbps, N devices connect between 21.5Mbps and 72Mbps and also only show around 20Mbps throughput with iperf. File copying from servers gets around 2.5Mb/sec transfer rates. There are no obvious alerts/events on the kit in WCS, I have rebooted a number of AP's to no avail. inSSIDer shows the AP's and their 300Mbps capability, but my N devices don't get anywhere near that speed, even when i'm stood directly underneath it with a device. I believe it is a dual band setup, as each AP has a seperate profile in WCS for b/g devices and a/n devices. The nics's in the devices are dual-band intel 6200's.
SSID's are secured with WPA2/AES/MAC Filtered, 802.1x RADIUS auth, linked with Server 2008 R2 DC via NPS
Could anyone shed any light on a potential problem or advise on troubleshooting techniques... this isn't really my area of expertise!
Be sure to verify the items Stephen and leolaohoo are mentioning. The Intel 6200 series contains several models. To achieve the 300Mbs, you will need 2 spatial streams minimum, and be connected on your 5Ghz spectrum with bonded channels. Also make applicable changes at WLC to achieve N throughput.