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Does this product exist?
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<blockquote data-quote="Josh Millward" data-source="post: 80229" data-attributes="member: 970"><p>Re: Does this product exist?</p><p></p><p></p><p></p><p>Yes, that is pretty much exactly correct. </p><p></p><p>One needs to remember that an Ethernet network, is by definition a non-synchronized, best effort medium. The fact that we can even make such a medium pass real time audio at all is impressive. </p><p></p><p>Each additional network switch that you add to a network will increase the forwarding delay to the endpoints that are connected to it, when measured from a different endpoint connected to a different network switch. If you cascade many network switches in series, the forwarding delay from one end of the string to the other will result in too much variation. This variation is where the problems come from. Everyone understands by now that you need to have a steady and consistent clock to allow the digital audio to work correctly. In a networked audio system you do need to distribute that clock signal across the network and if it shows up early and late often enough, the device will just become confused and quit transmitting audio. If you are looking at the health of the devices with manufacturer provided software you may see error messages that will tell you that there is too much variation in the clocking information (beat packets... in CobraNet lingo, you may experience a "beat flood" condition). </p><p></p><p>So, this problem will depend a great deal on the forwarding delay of the network switches that are in use. Using high speed network switches with Gigabit links between them is a great way to minimize these problems, even if the endpoint links are 100Mb.</p></blockquote><p></p>
[QUOTE="Josh Millward, post: 80229, member: 970"] Re: Does this product exist? Yes, that is pretty much exactly correct. One needs to remember that an Ethernet network, is by definition a non-synchronized, best effort medium. The fact that we can even make such a medium pass real time audio at all is impressive. Each additional network switch that you add to a network will increase the forwarding delay to the endpoints that are connected to it, when measured from a different endpoint connected to a different network switch. If you cascade many network switches in series, the forwarding delay from one end of the string to the other will result in too much variation. This variation is where the problems come from. Everyone understands by now that you need to have a steady and consistent clock to allow the digital audio to work correctly. In a networked audio system you do need to distribute that clock signal across the network and if it shows up early and late often enough, the device will just become confused and quit transmitting audio. If you are looking at the health of the devices with manufacturer provided software you may see error messages that will tell you that there is too much variation in the clocking information (beat packets... in CobraNet lingo, you may experience a "beat flood" condition). So, this problem will depend a great deal on the forwarding delay of the network switches that are in use. Using high speed network switches with Gigabit links between them is a great way to minimize these problems, even if the endpoint links are 100Mb. [/QUOTE]
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