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

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#487

From: John Navas
Date: Fri, 02 Feb 2001 19:56

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[POSTED TO comp.dcom.modems.cable; PLEASE REPLY THERE]

In <3A782325.2538A5E2@mynetwatchman.com>, Lawrence Baldwin
<baldwinlSPAMMENOT@mynetwatchman.com> wrote:

>> Regardless, typically no one cable user can use a disproportionate share
>> of capacity in any event 
>
>Due to slotting/throttling algorithms, I assume.

Due to channel assignment, classification, and polling algorithms in the
CMTS (headend).

>What is the typical *total* amount of upstream bandwidth avail on a
>given segment?

There's no hard and fast rule that I know of -- both capacity and load
vary widely.

>We're getting closer to the key metric to compare cable with DSL: 
>   *Upstream oversubscription rate*

I don't think so.  Upstream oversubscription is really an issue only on
cable, since (1) DSL has dedicated upstream to the DSLAM, and (2)
backhaul links are symmetric (as compared to asymmetric subscriber
connections).

-- 
Best regards,
John Navas     <http://navasgrp.home.att.net/>
     CABLE MODEM/DSL GUIDE:  <http://Cable-DSL.home.att.net/>

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From: John Navas <spamfilter@navasgrp.dublin.ca.us>
Newsgroups: comp.dcom.modems.cable,bellsouth.net.support.adsl
Subject: Re: cable guy "vapor"-izes DSL 3X cable TV troll!
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