Doug,
See inline...
Doug Ratcliffe wrote:
I'm not using Canopy at the moment - I had bought a trial kit, ended up
selling it. I'm using Mikrotik right now. How are you doing with
concurrent calls per sector?
If I'm not mistaken the Canopy Advantage white papers claim 25
concurrent VOIP calls (per AP) using the G.711 codec.
I'm talking about rolling out a network
_mostly_ dedicated to VOIP, even some customers without data at all. Some
customers would have as many as 8 to 10 voice lines. For customers who want
more I would simply use a PtP link for them. With all VOIP the real
bandwidth cuts to 4.5Mbps on Advantage according to Motorola's white papers.
I'm also concerned with scalability, if I have 6 x 5.7 Canopy APs on a
tower, I need 100' of vertical space to co-locate a 5.2 set. Most of my
towers aren't even 100' tall. Trango is not only dual polarity, but dual
band as well. Nothing suggests you can't put them all in close proximity as
long as they are in different polarizations / bands when close by.
I have a cluster of 5.7 Canopy AP's and 5.2 Canopy AP's installed on the
same bracket about 250' up. All GPS sync'd without a problem.
I wonder if IAX2 trunking would allow more VOIP calls over the same data
bandwidth due to packet size / aggregation?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Eric Muehleisen
Sent: Monday, July 02, 2007 3:05 PM
To: WISPA General List
Subject: Re: [WISPA] Trango & VOIP
Doug,
I will second Forrest's comments. We have been running VOIP on Canopy
for several years now will great success. The key is setting the high
priority queues and DiffServ settings. We also tagged VOIP traffic in a
high priority DHCP VLAN. We've found that PPPoE encapsulation really
struggles with VOIP. Are you using PPPoE?
-Eric
Forrest W Christian wrote:
Doug Ratcliffe wrote:
I tried Canopy Adv. a few months back but was
unhappy with the overall range & quality (2.5 miles LOS w/ a
reflector, and
8 port ATA, the voice was choppy when I had all 8 calls going). I’m
transmitting 1-3 miles over a salt water ¾ mile wide river.
On the canopy side: Two things:
1) The secret of making canopy work at extended ranges is buying
cyclone AP's from last mile gear. http://www.lastmilegear.com. I
regularly get 10+ miles LOS with a reflector at 5.7, and 20+ miles LOS
with a reflector at 2.4. Without the cyclone APs you can get roughly
half that. The one thing you may have missed is that canopy is
multipath sensitive, so moving the SM even 6-8 inches could make the
difference between a great link and no link - especially with a big RF
mirror like the river you are talking about.
2) VoIP on canopy works really well when set correctly. Correctly
means having the correct (not necessarily the latest) version in the
AP and SM, and setting prioritization in both the AP and SM for voice
traffic. In addition, you need to watch and make sure that you have
bandwidth set correctly and are getting the speeds you expect. If you
had a marginal link, there is every possibility that you simply did
not have sufficient bandwidth available to you in the upstream
-forrest
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
