I have a scenario where the minimum 802.11b/g data rate has been set at 1mbps mandatory on a WiSM template stored on WCS.
We think that this is allowing clients to try to attach to the wireless network with a very tenuous connection, which is resulting in very poor performance.
We also think that this poor performance will be impacting the wireless experience for all the other users of the wireless access point who are close enough to talk at a more reasonable speed.
Are we correct in this thinking?
If we change the manadatory connection speed back to 5.5mbps what effects, if any will we see as we have concerns that we will create some coverage holes and if we did, would they be huge?
Is there a way to model it?
If we do, would the increase in network performance for the many outweigh the inconvenience of a covergae hole?
thank you for any help/feedback, I am trying to build a case to get the data rate back to 5.5mbps at least but am enountering mgmt resistance.
There are a number of factors that can impact/influence the data rates you select; such as AP density, client devices, and protocols supported. Also it's important to understand the difference between Mandatory and Supported when configuring the data rates.
Generally speaking it's ok to set 5.5mbps to Mandatory, which means that you must achieve a 5.5mbps or higher conenction in order to associate to the access point once associated you can step down to 1mbps or 2mbps if they are configured as supported.
Personally without knowing what your wireless design looks like in terms of density of access points and with out knowing what types of clients your running: laptops, pda's, vocera badges, VOIP phones. I'd set 5.5mbps as manadatory and set the rest to supported and test from there, keep in mind that the coverage holes are more than just data rates they are signal levels. The thing to remember with coverage holes is that your wireless network needs to be a 2-way communication between the client and the AP, in many installations you can encouter scenarios where the client device (ie: phone or laptop) can hear the AP just fine but the AP never hears the client device, this results in huge performance issues and coverage holes. This happens because the majority of client devices are limited to a maximum transmit power of 25 to 30 mw, While an AP is capable of 100mw (802.11b), 30mw (802.11g), 40mw (802.11a).
So as you progress thru this issue it's important to consider not just the data rates, but the overall design and make sure that your not encountering a true coverage issue.
Hope this helps