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'" <[email protected]> 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 -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.9.6/865 - Release Date: 6/24/2007 8:33 AM -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.14/845 - Release Date: 6/12/2007 6:39 AM -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
