Very interesting...definitely worth knowing. The simple answer is that it probably won't associate but could which in my experience means it will leave the SM stranded. It's a simple toggle to different frame size anyways =)
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Sep 10, 2015 at 12:35 PM, Dan Sullivan < [email protected]> wrote: > Josh, > > > > Good question from yesterday as it started an internal discussion. Let me > give some more details as my “No” answer is not as black and white as I > indicated. > > > > When running TDD mode based MAC interfaces (e.g. 5 msec, Flexible, and now > 2.5 msec), the AP defines the content and timing of each frame which > includes when each SM in the UL can transmit. Therefore, as long as the SM > does what it is told, this provides a great deal of compatibility between > releases. > > > > For 2.5 msec frames from a 2.5 AP, a 2.4.3 SM will work in 75/25 and 50/50 > modes, but not with the same performance as a 2.5 SM. > > > > A 2.4.3 SM will work in 30/70 mode as long as at least one 2.4.3 SM does > network entry right when the AP first comes up, but the 2.4.3 SM will not > work if it does network entry later and there were no 2.4.3 SMs that did > network entry when the AP first came up. The 2.4.3 SM will be at a > performance deficit compared to a 2.5 SM. > > > > There was no QA testing done between the 2.5 AP in 2.5 msec mode <-> 2.4.3 > SM. It was done with 2.5 AP in 2.5 msec mode <-> 2.5 SM. Therefore, there > is a greater chance that something could not work in the 2.5 AP in 2.5 msec > mode <-> 2.4.3 SM. > > > > My recommendation is similar, upgrade your SMs to the 2.5 release first > and then set the AP to 2.5 msec mode. > > > > And yes, there was some intentionality to the 2.5 release containing the > 2.5 msec feature J > > > > Dan > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Josh Luthman > *Sent:* Wednesday, September 09, 2015 5:14 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] ePMP AP running 2.5 ms - station firmware > requirement > > > > Thanks guys!!! > > > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > > On Wed, Sep 9, 2015 at 6:13 PM, Dan Sullivan < > [email protected]> wrote: > > Josh, > > > > No. 2.4.3 stations cannot support 2.5 msec frames. You will need to > upgrade your stations to the 2.5 release and then they will be able to > listen to an AP configured to 2.5 msec frames. > > > > Daniel Sullivan > > ePMP Software Manager > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Josh Luthman > *Sent:* Wednesday, September 09, 2015 5:08 PM > *To:* [email protected] > *Subject:* [AFMUG] ePMP AP running 2.5 ms - station firmware requirement > > > > I'm wondering if my stations at 2.4.3 can talk to an AP doing 2.5ms > frames. Does anyone know? > > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > >
