Bandwidth Control
ceg3:
I was talking with a tier 3 TWC support guy yesterday about an issue and the subject of my call quality came up. He said one of the problems with VOIP, other than TWC Phone, which uses the net, but is on a separate network, is that the services tend to try to use all your bandwidth. That got me to thinking about bandwidth control for the first time in a long time for my OBi. I remember two or three years ago setting it up with 100 kbps up and down for my OBi at that time, but I can't remember what the experience was like then.
Is anybody employing this these days with their OBi? As you can see, I have plenty of bandwidth. Bufferbloat at that moment brought down my score, but you can see I have lots bandwidth. I'm trying to imagine an application, in this case VOIP, demanding all that bandwidth and then having issues if it can't get it all. Am I onto something or just all wet?
drgeoff:
VoIP does NOT try to use all your bandwidth. It runs at a fairly constant rate which depends on the voice codec in use. Most times that is a 64 kbit/s codec. I'm aware of lower rate codecs being used for IP telephony but not higher rate ones. There will be some added overheads on that 64 kbit/s which could take it up to around 100 kbit/s but not more.
It is the other services and applications such as web browsing, file downloading, P2P which attempt to use all the bandwidth they can get.
ceg3:
OK, so if the other sources are attempting to use all the bandwidth, then that is where QOS comes into play I assume. I have a TP-Link router and they use bandwidth control to create QOS. The TWC rep had his viewpoint, perhaps a wrong one. Is anyone setting up a consistent experience for their OBi by setting up a specific max and minimum bandwidth, ie 100 kbps. It would take all the devices I've got to utilize so much bandwidth that my OBi would not have 64 kbit/s available, but it somehow makes some to sense to my thinking that inconsistency might create issues for VOIP. By setting a min/max bandwidth for the OBi the experience would not be fluctuating and might help, since they don't require much bandwidth.
Studio_Musician:
It would take one video that's streaming to use up all the bandwidth you've got. ;)
edit: If you want to look at some audio codes you could install x-lite. Then go Softphone => Preferences => Audio Codecs then click and get educated a little.
Audio codecs are also covered at wikipedia.com:
http://en.wikipedia.org/wiki/List_of_codecs
ceg3:
Good point about the video.
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