Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

1941W AP speed

I'm confused about the router's AP capabilities. I know both radios in the AP can do 802.11n but I can't figure out how to set the speed above 54 which happens to be the max speed for 802.11g. 

How do I set the speed to the max of 300Mb/s on the 5GHz radio?

Cisco Employee

There are various

There are various configuration factors which may affect your 802.11n speeds. One of them is as simple as using AES encryption must be used.

You should follow the guidelines and troubleshoot as per this guide to see any discrepancy on your configurations :

Troubleshoot 802.11n Speeds



**Encourage Contributors. RATE Them.**

-Thanks Vinod **Rating Encourages contributors, and its really free. **
Cisco Employee

There are circumstances where

There are circumstances where 802.11n devices cannot operate at their maximum capable data rates. There are various reasons why this occurs. This is the list of factors that affect 802.11n throughput:

  1. When 802.11n clients operate in a mixed environment with 802.11a or 802.11 b/g clients, 802.11n provides a protection mechanism to interoperate with 802.11a or 802.11 b/g clients. This introduces an overhead and reduces the throughput of 802.11n devices. Maximum throughput is achieved in Greenfield mode where only 802.11n clients exist.

  2. Factors such as Channel width, Guard Interval and Reduced IFS (RIFS) play a major role in the bandwidth. Table 1 and Table 2 show how these factors affect the bandwidth.

  3. Clients ability to send a Block Ack instead of individual frame acknowledgements.

  4. MCS Index configured on the WLC.

  5. Proximity to AP—Clients closer to the AP experience higher data rates. As clients move farther away from the AP, signal strength reduces. As a result, data rate decreases steadily.

  6. RF environment—Amount of noise and interference in the environment. The less the noise and interference, the greater the bandwidth.

  7. Encryption/ Decryption—Encryption in general reduces the throughput due to the overhead involved in the data encryption/decryption process. However, advanced encryption standards, such as AES, can provide better throughput when compared to other encryption standards, such as TKIP and WEP.

  8. Wired Network Infrastructure—Bandwidth of the wired infrastructure determines the speed of the traffic to and from the wired network to the wireless clients.

  9. If using an AP1250, change the AP to H-REAP mode for a 5-10% boost.

  10. If using an AP1140, keep the AP in local mode and enable TCP MSS on the controller. Use the config ap tcp-adjust-mss enable all 1363 command in order to enable it.

  11. Disable RRM scanning to prevent any throughput drops when going off channel. This can yield a 1-3% improvement.

  12. Disable RLDP to ensure the AP does not attempt to connect to rogue devices during testing.

  13. Use a Wireless Controller 5508 as the data plane is superior to the 4404-series.

Hall of Fame Super Silver

Here is a quick simple answer

Here is a quick simple answer.... Make sure your encryption is set to WPA2/AES and also make sure WMM is enabled and 40 MHz channel width is being used.  The last two along with AES is what is required to see 300mbps from a compatible 802.12n device.  Make sure when you test also, that your near the AP so that signal isn't an issue. 

Look at the link posted in the other post also. Both post has very good info. 


*** Please rate helpful posts ***
CreatePlease login to create content