I have a wireless network using AIR-LAP1131G-E-K9 in indoor, AIR-LAP1310G-E-K9 on outddor and a wireless LAN ContrÃ´ller 4402 to contrÃ´l all the APs.
In order to increase the coverage of the outdoor AP, I have planned to use 802.11b for AIR-LAP1310G-E-K9 while using 802.11g for the indoor AP.
My question is if an IP Phone CP 7921G from the indoor using 802.11g is walking to the outdoor which use 802.11b, the communication will be dropped or there will be semaless roaming betwwen 802.11b and 802.11g?(the same SSID will be difused)
I don't see any problem here if this is all 2.4GHz. I would 11b&11g on the outdoor AP, no reason to limit yourself to 11b.
Initially I thought you were talking about roaming from 5GHz to 2.4GHz ... at present, that will entail something like a 2 second dropout at roam time, as the 5GHz signal drops below the ~-80dBm threshold and the phone scans the 2.4GHz band.
However, if you enable only 11 Mbps or some other 802.11b data rate only and the other APs have 802.11b/g rates enabled, then the client may not upshift to the 802.11g rates after coming from the AP with 802.11b only rates.
We are also adding interband seamless roaming for the 1.3(4) release.