I could certainly see how Trango could be superior to other multi-modulation systems. Others would up and down speed, affecting overall performance while Trango is going to be either working or dropping packets (which only affects one customer, with ARQ off).
I am close to picking Trango but since Trango is discontinuing 5.3 due to DFS requirements, now I'm starting to wonder if 5.7-5.8 is enough. ---------- Original Message ---------------------------------- From: "Tom DeReggi" <[EMAIL PROTECTED]> Reply-To: WISPA General List <wireless@wispa.org> Date: Tue, 3 Jul 2007 19:16:55 -0400 >>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 > >-- >WISPA Wireless List: wireless@wispa.org > >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: wireless@wispa.org > >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: wireless@wispa.org > >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: wireless@wispa.org > >Subscribe/Unsubscribe: >http://lists.wispa.org/mailman/listinfo/wireless > >Archives: http://lists.wispa.org/pipermail/wireless/ > -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
