[cisco-voip] [OT] Re: VoIP over Motorola's Canopy?!?

[Netfortius]

NOTE: I apologize - this has nothing to do with Cisco, anymore, and I think I 
have gotten the answer for the original VoIP question, so this message is 
just to publicly acknowledge and thank Eric for his replies. Any 
further/follow-up discussions on this subject - if Eric will decide to do 
so - will probably have to be moved off-line.

----
Eric,

Thanks again for the explanation. I have probably used the wrong terminology - 
the way the vendor has explained this to me was that the main site would have 
the capability of communicating with all other seven w/13-14 Mbps/ea, which 
implies, then, a sort of "array" of APs at the main location (or an AP 
capable of working with multiple?!?), and then an AP per each site. My main 
worries are related to:

- how would this happen, w/out interference of any sort (e.g. I have two sites 
which are alongside each other, "in the way" to the central location)? Would 
prioritization still work (is this some sort of collision avoidance mechanism 
+ identification of priority channel for each AP-AP conversation, 
separately?!?)

- what would happen if someone else sets up a similar configuration, in 
the "path" between one of my sites and the central one?

Again - I am not sure how to term the above configuration, as far as its 
components, as well as not being sure what Motorola has done to address the 
issues above.

I guess I will have to pay for a test (the vendor seems to offer an option of 
try-and-buy-if-it-works as advertised), but I need some reading on the 
technology before I understand what the implications would be.

Thanks,
Stefan

P.S. 

On Tuesday 11 April 2006 07:06, Eric Helm wrote:
> SM=Subscriber Module=Motorola lingo for CPE.
> Keep in mind that the 20 mbps (13-14 actual) throughput is shared among
> all the subscribers on the AP. With that said, the Canopy system does
> have 2 queues (channels in Moto terms). You can use Diffserv to map your
> VoIP traffic into the high priority channel. Setup for this actually
> happens on the SM side, and the AP should honor these settings as well.
> You shouldn't have any problem running VoIP over Canopy with 7 SMs
> attached to your AP.
> In our residential network, we have some VoIP running on APs that have
> 100+ subscribers on them. It runs pretty good overall, but there are
> definitely times of degradation on the VoIP. I think it is a PPS
> limitation of the Canopy in our case.
>
> /Eric
>
> Netfortius wrote:
> > Eric,
> >
> > Thanks for answering so fast! See inline ...
> >
> > On Monday 10 April 2006 19:11, you wrote:
> >> Stefan,
> >
> > NOTE: This will be a replacement for two T1s for each site connecting
> > back to the main one, of which one is fractional, with 6-10 channels for
> > voice. I am planning on leaving one "land" T1 per remote site, as a
> > backup for the wireless.
> > DISCLAIMER: I am totally unfamiliar with the Canopy system - which, based
> > on my brief reading, seems to also conflict with some of my knowledge of
> > WiFi (as far as bandwidth as a function of number of systems connected -
> > the way I understand it now)
> >
> >> Do you plan on running any other data on the Canopy gear?
> >
> > Yes - planning for something like a 75%-25% ratio to voice (75% data)
> >
> >> How many SMs will be attached to each AP?
> >
> > I am looking into main site and seven SMs (is this the right term?!?), on
> > the 2.4 GHz solution (presumably 20 Mbps on paper, 13 MBps in reality -
> > as far as the system being advertised by our vendor), i.e. main site
> > communicating 13 Mbps up+down, to each one of the seven sites.
> >
> >> What is the backhaul from the APs? Wireless, as well or other?
> >
> > Land lines (if I correctly understand backhaul as the connection from the
> > network to the Internet) from the main site - so every site communicates
> > through the main one via the Canopy system, then onto the internet via
> > DS3-type connections ... or am I misunderstanding the question?!?
> >
> >> /Eric
> >>
> >> Netfortius wrote:
> >>> I am contemplating a centralized CM 4.2 deployment, in a hub-and-spoke
> >>> environment (WAN links from a central location), over Motorola's Canopy
> >>> system (vs. most traditional WAN links like T1s, MPLS, etc.). Has
> >>> anybody had any experience with such?
> >
> > TIA,
> > Stefan
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