Yes, I think the WiPhone works or in 802.11b/g or in 802.11a but not both at the same time (one active and the other in standby/scanning). So, the switching process from 802.11b/g to 802.11a causes an outage. I'd like to know if someone has tested if this possible roaming-outage is perceptible in a roaming inter-cell from 802.11a to 802..1b/g and viceversa, during a call.

So only 1 band is scanned during association period. If connected to 802.11a w/ Auto-A configured, then will not scan B/G until signal for 5 GHz for configured network is lost. So yes it will be noticeable, which is why I stated this type of roam is not seamless. Please set expectations correctly.

I was interested in roaming between b/g cells and a cells, 'cause I have to project an outdoor coverage for a campus. The indoor coverage is already present: there are more than 100 APs distributed over 3 buildings, using the 3 non-overlapping channel (ch 1, 6, 11 managed by 3 WLC4402-50-K9).

My goal was to use the 802.11a for the outdoor coverage to avoid the channels interference with the indoor signals. Moreover in 802.11a I could use 19 channels against only 3 non-overlapping channels of 802.11b/g.

The outdoor coverage in this campus was thought above all for WiPhones connectivity, so I think I can't use the solution I mentioned before, for the roaming trouble.

Thank you for your support,

reagrds

Federico