05-31-2010 06:09 PM
Is there any specific reason for this? Is there any harm in allowing the 40MHz width to be used on both the "a" and "g" radios?
For now I've left both both radios enabled, along with 40MHz for each, to allow for maximum throughput. I'm just hoping this doesn't mess up anything else.
PS - On a side note, what types of actual throughput are you guys getting on your 802.11n deployment? I've done some basic tests (iPerf, large file transfers), and have only been getting a max of around 60-80Mbps, even when connected on the 5GHz range at 300Mbps.
06-02-2010 12:55 AM
The 40 Mhz channel width is really only available with 5 Ghz band. On 2.4 Ghz band you have only 3 non-overlapping channels (eg. 1-6-11) and usage of the 40 Mhz channel width bonds 2 non-overlapping channels 1-6 or 6-11. You can see that in both cases the channel 6 is used then in a multi-APs environment you will have interference between AP using 1-6 and 6-11. In the contrary with 5 Ghz band you have plenty of non-overlapping channels.
The advice is:
Use 40 Mhz with 5 Ghz frequency
Use 20 Mhz with 2.4 Ghz except if you have only one Access-Point
About the speed I have done a workshop last october with AP125 and AP105. Both APs performs the same in relation to the bandwidth to the users. I have reached a max ~150 Mbps user traffic with Iperf between one Wireless PC and one wired PC.
A few thing to take care to maximize the output:
-Use Gigabit ports for the APs and Wireless Controller
-Use 40 Mhz in 5 Ghz band
-Check that the client Wireless card is supporting 2 spatial streams (otherwise you will have
only half the throughput
08-06-2010 10:11 AM
09-07-2010 11:21 AM