Article View: comp.dcom.modems.cable
Article #422video conferencing - death to cable?
From: Albert Hennesy
Date: Sat, 03 Feb 2001 19:19
Date: Sat, 03 Feb 2001 19:19
35 lines
3182 bytes
3182 bytes
It seems to me from this discussion that a moderate usage of video conferencing would be death for cable data service as it now exists. Video conferencing involves symmetric and non-bursty data streams and to-the-max uplink speeds. How could cable ISPs handle this without adding another prohibited usage to their list? Al_Hennesy "John Navas" wrote: > There's usually enough uplink capacity to handle > return ACK's (notwithstanding actual uplink to > downlink ratios of 1:7 on popular websites, as seen > in tests I've run). The problem is generally triggered > not by return ACK's for downstream traffic, but by > upstream traffic (uploading). > ......... > With FTP, the ratio of returning ACK's to downstream > traffic is usually well over 50:1 in bytes (not packets). > The ratio is higher for popular websites (HTTP), but > such traffic tends to be bursty, which tends to mitigate > the adverse effects. > ........ > The main danger is uploading (e.g., sending out a large > multimedia file). > ....... > What's different from DSL is that uplink > saturation affects *all* subscribers on the same segment. > > >Also as you point out, upstream of the DSLAM, DSL > >would seem likely to saturate it's downstream link well > >before it ever saturated it's upstream link . > > I think that's right.
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<3A648E27.6A7029EF@erols.com> <20010116192016044.AAA95@adsl-209-204-185-87.sonic.net@john.navasgroup.com> <3A64B680.2A79F24D@erols.com> <3A76B6CA.73B36B26@mynetwatchman.com> <4OGd6.100$mW6.5202@typhoon.sonic.net> <3A776B57.C495242C@mynetwatchman.com> <R3Ld6.144$mW6.6010@typhoon.sonic.net> <3A782325.2538A5E2@mynetwatchman.com> <diEe6.142$Tf1.5347@typhoon.sonic.net> <3A7B357B.3C2C1C79@ufl.edu> <S4Ke6.163$Tf1.6485@typhoon.sonic.net> <3A7B76D4.AA1FFC9F@ufl.edu> <GLXe6.202$Tf1.9002@typhoon.sonic.net>Show Full Headers
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1122a6,2145df83169cbbc6 X-Google-Attributes: gid1122a6,public X-Google-Thread: 113850,916316de6f72ceb X-Google-Attributes: gid113850,public X-Google-ArrivalTime: 2001-02-03 11:19:31 PST Path: arc1-ca.pugleaf.net!supernews.google.com!sn-xit-02!sn-xit-01!supernews.com!newshub2.rdc1.sfba.home.com!news.home.com!newsfeed.direct.ca!look.ca!newsfeed1.earthlink.net!newsfeed.earthlink.net!newsmaster1.prod.itd.earthlink.net!newsread1.prod.itd.earthlink.net.POSTED!not-for-mail From: "Albert Hennesy" <AHennesy@HotPOPmail3.comDELmail> Newsgroups: comp.dcom.modems.cable,bellsouth.net.support.adsl References: <3A648E27.6A7029EF@erols.com> <20010116192016044.AAA95@adsl-209-204-185-87.sonic.net@john.navasgroup.com> <3A64B680.2A79F24D@erols.com> <3A76B6CA.73B36B26@mynetwatchman.com> <4OGd6.100$mW6.5202@typhoon.sonic.net> <3A776B57.C495242C@mynetwatchman.com> <R3Ld6.144$mW6.6010@typhoon.sonic.net> <3A782325.2538A5E2@mynetwatchman.com> <diEe6.142$Tf1.5347@typhoon.sonic.net> <3A7B357B.3C2C1C79@ufl.edu> <S4Ke6.163$Tf1.6485@typhoon.sonic.net> <3A7B76D4.AA1FFC9F@ufl.edu> <GLXe6.202$Tf1.9002@typhoon.sonic.net> Subject: video conferencing - death to cable? Lines: 38 Organization: Boundary Software, Inc. MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Message-ID: <6RYe6.1265$T_5.183008@newsread1.prod.itd.earthlink.net> Date: Sat, 03 Feb 2001 19:19:30 GMT NNTP-Posting-Host: 63.208.245.13 X-Complaints-To: abuse@earthlink.net X-Trace: newsread1.prod.itd.earthlink.net 981227970 63.208.245.13 (Sat, 03 Feb 2001 11:19:30 PST) NNTP-Posting-Date: Sat, 03 Feb 2001 11:19:30 PST