But can systems like Mikrotik for
QOS adequately pack the packets over the wireless
Good Question, that I do not have the answer to.
I had thought that there was some trade off in latency doing the packet
combining on slow processor boards.
One of the big reasons, I have been an advocate for higher processor
400-533Mhz boards.
The Trangos have a higher PPS count than you might think. (I no longer have
the data on what that amount actually is)
The DSSS/TDD radios are also more consistent in their delivery of
throughput, which make them more predictable then a radio that may be fast
90% of the time but frequently drop down to low speeds, and drop VOIP
packets during the process.
But in the same sense, its not as cut and dry as oversubscription.
Agreed, but on the other hand, its not as cut and dry as having high PPS
count either.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Doug Ratcliffe" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Tuesday, July 03, 2007 10:39 AM
Subject: RE: [WISPA] Trango & VOIP
But in the same sense, its not as cut and dry as oversubscription. If it
were, then a 5Mbps/5Mbps ratio could give me 103 calls/Mbit (IAX2/G729) but
in reality, that's 100k PPS per 100 calls, making it unworkable. But at the
same token, if I decide 15 concurrent calls @ G711 per AP is a usable number
with bandwidth left over, I can manage oversubscription there.
Ultimately, it's the PPS that kills it. But can systems like Mikrotik for
QOS adequately pack the packets over the wireless so that instead of
transmitting 100 300byte packets, to transmit 20 1500byte packets?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Tom DeReggi
Sent: Tuesday, July 03, 2007 10:06 AM
To: WISPA General List
Subject: Re: [WISPA] Trango & VOIP
I have plenty of VOIP customers behind my Trango network.
I'm also getting excellent results using Targeted Technologies proprietary
8K stream VOIP even over my 900Mhz Trango.
Trango has plenty of processing power and pps performance to do VOIP.
The relevent question is, is the oversubscription rate you plan to use on
your network within the capabilty of delivering VOIP?
There are many challenges in delivering quality VOIP over ANY PtMP network
design.
Although prioirtization helps, its not the one save all feature. In PtMP end
users must compete for upload time of the AP, even smart polling systems do
not 100% solve this issue in an oversubscribed network, although helps
significantly. Backend prioiritization is not enough for upload direction,
if it gets choked at the AP before it reaches the prioritization. If you
are going to do VOIP, you must be more conservative on your oversubscription
rate, and you will be fine. On the download side it is not a problem as
traffic will reach the bandwdith management/prioiritization before it
reaches the AP.
With that said, Trango had been working on a VOIP prioritized firmware last
year for the 5580, I do not know if it was released or not.
The second issue is whether you are designing your Trango network with
enough RF margin. Never never use a bare 5580 radio, its pointless. The
Behive antennas are now shipping for the Trango 5580 also!! They work great,
and bring the signal up to between 15-18 db antenna gain, depending on the
case. They are great.
Lastly, the newest Trango Firmwares added some support to help with out of
order packets with its ARQ algorithym. This seemed to help quite a bit to
optimize the VOIP performance when using ARQ. We only run Trango with ARQ.
To valuable to turn off. (With the exception of for 5830s).
The other decission you'll need to make is whetehr the over all design of
your network is good enough to be a VOIP provider. You will have to be the
judge of that. Voice services are demanding, from an uptime SLA point of
view. To handle this, we are adding more point to point links, more
licensed links, getting rid of backbone bottle necks, etc.
But Trango can handle VOIP just fine, as far as capabilty of a radio. The
VOIP engineering is up to you, on the router behind and in front of them.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Doug Ratcliffe" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Monday, July 02, 2007 2:23 PM
Subject: [WISPA] Trango & VOIP
Just a quick question to the list, is Trango 5800 series still a viable
option for providing data & VOIP (IAX2) to customers? I know a few ISPs out
there who use it for that, but there's virtually no data at all on the
Trango site regarding it. 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.
I am just looking for some real world experiences out there.
Thanks
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