07-26-2007 06:20 AM - edited 07-03-2021 02:24 PM
Does anyone know if a 7921 Cisco WiPhone can automatically switch from a 802.11g connection to an 802.11a connection moving from a g coverage area (2,4 GHz) to an a coverage area (5,0 GHz)?
07-26-2007 12:19 PM
Yes if the phone is in one of the Auto modes, either Auto-RSSI, Auto-a, or Auto-b/g, then the phone can potentially roam to a different band. The roam will not be seamless as it will have to discover the channels in the new band. Also DFS channels on 5 GHz will need to be passively scanned.
So should expect a short outage when moving to a new band and on call. The call will be retained after moving to the new band.
07-27-2007 12:43 AM
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.
07-27-2007 02:57 PM
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.
07-28-2007 01:58 AM
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
07-28-2007 07:33 AM
Hi Michael,
Very good description of this functionality! 5 points for your great work :)
Take care,
Rob
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide