nanog mailing list archives
Re: [NANOG] Comcast latency
From: "Mike Fedyk" <mike () reachme com>
Date: Thu, 1 May 2008 14:32:07 -0700
-----Original Message----- From: John Osmon [mailto:josmon () rigozsaurus com] Another time, I had a VOIP conversation fall apart once with somone on a Comcast link. When the jitter finally fell into a reasonable range, the call sounded *great* again -- but there was a 4 second latency that had been introduced. It was wild. I kept wondering -- "where was this buffered? Are we on a satellite backup route?" We kept the conversation going for a while just for the sheer novelty.
The delay was probably introduced by an adaptive jitter buffer on one of the VoIP end points. It is supposed to reduce the buffer as network conditions improve. When it "fell apart" the buffer was increased until it was long enough to reorder all of the packets. It would be interesting to see if a call between those same end points would reduce the size of their buffers after the network stabalized again. Mike _______________________________________________ NANOG mailing list NANOG () nanog org http://mailman.nanog.org/mailman/listinfo/nanog
Current thread:
- Re: [NANOG] Comcast latency Tim Thompson (May 01)
- Re: [NANOG] Comcast latency James Michael Keller (May 01)
- <Possible follow-ups>
- Re: [NANOG] Comcast latency Mike Fedyk (May 01)
- Re: [NANOG] Comcast latency Tim Thompson (May 02)
- [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Mike Leber (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion jamie (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Patrick W. Gilmore (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Sean Figgins (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion David Conrad (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Joel Jaeggli (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Chris McDonald (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Marc Manthey (May 02)
- Re: [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Patrick W. Gilmore (May 02)
- [NANOG] fair warning: less than 1000 days left to IPv4 exhaustion Mike Leber (May 02)