Re: cable guy "vapor"-izes DSL 3X cable TV troll!

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#496

From: Lawrence Baldwin
Date: Sat, 03 Feb 2001 14:42

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I didn't think the amount of upstream bandwidth was even THAT high,
Randy.

Ingress noise just KILLS upstream bandwidth...this doesn't happen on the
fiber part
of HFC, but you still have quite a bit of coax.  I thought it was much <
10Mbps potential, and
reduced even further due to noise issues.


"Randy S." wrote:

> 
> Well, let's see, I believe a cable segment supports 54 Mbps download and 20 Mbps upload
> typically (I believe that they can vary this by how many channels they dedicate to
> delivery, I think there is 27 Mpbs down and 10 Mbps up per channel) .  If a segment has say
> 270 users on it (assuming a 100:1 oversubscription ratio that John used as typical for DSL
> earlier), each capped at 2 Mbps download, 384 Kbps upload (I think that's typical?) it
> would take 20,000 / 384 =  52 users uploading at maximum rate to saturate the upstream
> stream.  Of course since many other people are ALSO uploading at normal rates, the real
> number would be somewhat lower.  Realistically, I would say 25-35 people uploading
> aggressively would effectively "kill" the segment.  Does that sound right, John?  The
> kicker here is that this would happen even if they were all just uploading files to others
> on the same segment!
> 
> Randy S.

-- 
-------------------------
Lawrence Baldwin
Protocol Scientist
678-624-0924
http://www.mynetwatchman.com - I'm under attack, now what?

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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> <4UKe6.5359$MA5.130255@news2.atl> <3A7B7FD3.9ABE0395@ufl.edu>

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Subject: Re: cable guy "vapor"-izes DSL 3X cable TV troll!
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