Clearwire May Block VoIP Competitors
Advanced IP Pipeline: "Someday, customers of wireless broadband provider Clearwire Corp. may be able to use Voice over IP services. But right now, Craig McCaw's newest company is giving its customers the silent treatment by apparently blocking outside VoIP providers from its network." http://www.advancedippipeline.com/news/159905772 - ferg -- "Fergie", a.k.a. Paul Ferguson Engineering Architecture for the Internet fergdawg@netzero.net or fergdawg@sbcglobal.net
"...In what the company claims is an effort to preserve the performance of its pre-standard WiMAX network, Clearwire says it reserves the right to prohibit the use of a wide range of bandwidth-hungry applications, a list that apparently includes VoIP as well as the uploading or downloading of streaming video or audio, and high-traffic Web site hosting." Hrm... Isn't a VoIP call realtively low bandwidth? I haven't studied this, but Vonage's site seems to imply that the maximum data rate is 90Kbps (http://www.vonage.com/help_knowledgeBase_article.php?article=190). I typically see speeds greater than this from my web browser... Are they saying that anything that might consume over 100Kbps isn't going to be allowed? Eric :)
On Sat, 26 Mar 2005, Eric Gauthier wrote:
Hrm... Isn't a VoIP call realtively low bandwidth? I haven't studied this, but Vonage's site seems to imply that the maximum data rate is 90Kbps (http://www.vonage.com/help_knowledgeBase_article.php?article=190). I typically see speeds greater than this from my web browser... Are they saying that anything that might consume over 100Kbps isn't going to be allowed?
90kbps may be low bandwidth but the packets per second are a killer for some equipment. VoIP typically has small packets, 80 bytes or 160 bytes, whereas your webbrowser has most packets close to the max MTU, usually 1500 byte packets. There is quite a bit of wireless gear that buckles under the stress of very few VoIP streams. Those few streams add up to much less then the theoretical advertised throughput. Adi
On Sat, 26 Mar 2005, Adi Linden wrote:
90kbps may be low bandwidth but the packets per second are a killer for some equipment. VoIP typically has small packets, 80 bytes or 160 bytes, whereas your webbrowser has most packets close to the max MTU, usually 1500 byte packets. There is quite a bit of wireless gear that buckles under the stress of very few VoIP streams. Those few streams add up to much less then the theoretical advertised throughput.
A typical voip call is a packet in each direction every 20ms, this makes a total of 100pps. Translated into a tcp stream with one ack per data packet, this would mean 600 kilobit/s bandwidth usage with the same pps. I would be quite upset if I couldn't use 600 kilobit/s for approximately the same time I would use voip per day (which truthfully wouldnt be much). -- Mikael Abrahamsson email: swmike@swm.pp.se
----- Original Message ----- From: "Eric Gauthier" <eric@roxanne.org> To: "Fergie (Paul Ferguson)" <fergdawg@netzero.net> Cc: <nanog@merit.edu> Sent: Saturday, March 26, 2005 1:35 PM Subject: Re: Clearwire May Block VoIP Competitors
Hrm... Isn't a VoIP call realtively low bandwidth? I haven't studied this, but Vonage's site seems to imply that the maximum data rate is 90Kbps (http://www.vonage.com/help_knowledgeBase_article.php?article=190). I typically see speeds greater than this from my web browser... Are they saying that anything that might consume over 100Kbps isn't going to be allowed?
it's not about bandwidth, it's about pps. namely, radios don't very much like a lot of pps ;] -p --- paul galynin
participants (5)
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Adi Linden -
Eric Gauthier -
Fergie (Paul Ferguson) -
Mikael Abrahamsson -
Paul G