Re: Looking for new MVEND ISP

[Dana Hudes <dhudes@hudes.org>]

Sorry you are not correct. 
Yes, there are definite differences between a DS-1 (commonly known as T-1)
facility and a DSL circuit. DSL comes in several flavors that affect end
user service (DS-1 has flavors as well, two of which affect service namely
whether you have 24 64k channels B8ZS ESF or 24 56k channels 8th bit
robbed signalling). DSL comes in symmetric and asymmetric service.
I have SDSL 1.1Mb, and thats full bidirectional. You don't get this for
$100-$200/month, its anywhere from $275-$500/month. ADSL is cheaper
because you have the higher bandwidth downstream (to you). 
We'll ignore HDSL and VHDSL, nobody offers it and for VHDSL if you aren't
in Manhattan you aren't close enough to the CO (I'm about 2000 feet to the
switch, inclusive of vertical risers in my building and the CO).

xDSL service always goes to a DSLAM which converts you from xDSL to ATM,
SDMS, or Frame Relay and sends your traffic on its way along a PVC to an
ATM/FR/SMDS switch.

A DS-1 circuit could bring you straight to a router. Most providers don't
do this because routers don't have the cost-effective port density of an
ATM or Frame Relay switch. Rather they bring you to an ATM/FR switch. Even
if you have a PPP connection, no problem we convert your frames to ATM/FR.

If your provider gives you the bandwidth you pay for, its no difference to
you. If the cell tax comes out of your bandwidth, that's bad. Then there
is oversubscribe. Yup, there is this attribute of Frame Relay called
Committed Information Rate (CIR). ATM has Constant Bit Rate (CBR). 
Providers don't honor those committment and oversubscribe. Everyone does
it. The question is how much.  Really cheap prices in the same market
can mean very high oversubscribe -- or just plain CIR 0 (get what you can
when you can). that said, someone could charge really high price and still
massively oversubscribe. All comes down to contracts and service level
agreements.

Confused? no problem hire me I'm a consultant and I teach this stuff in
college as well. I am always branching into unix services which is why  I
am working with minivend but my Principal Consulant gig is dealing with
large and very large networks for customers of Nortel Networks.

Before you argue or anything, go read http://www.covad.com
they provide DSL (not Internet, read the pages and you will understand).





On Fri, 23 Jul 1999, Jason Korkin wrote:

> ******    message to minivend-users from Jason Korkin <jkorkin@korksoft.com>     ******
> 
> I think you all may be forgetting the downside of a DSL line... The
> major benefit to it is the cost, yes, I agree, however; its NOT a T-1
> line.  A DSL line is also not considered a ``Priority 1'' line either,
> which basically means, if you have the lines go down, a T-1 line will
> have priority over a DSL.  
> 
> Speed is also a factor, T-1's can have sustained speeds up to
> 2MBit/sec., DSL can have that only one way (unless you work something
> out with your provider) - and that is usually downstream, not upstream.
> 
> Basically depending on your situation a DSL line is nice, just like a
> cablemodem is too. However, you need to remember about downtimes, etc...
> you dont want to have a line go down on you and not have your site up!
> :-)
> 
> thats my $0.02 :-)
> 
> Jason Korkin.
> 
> 
> austad@fallon.com wrote:
> > 
> > ******    message to minivend-users from austad@fallon.com     ******
> > 
> > >What part of the world are you in?  If you are in the US in a major metro
> > area, you
> > >could consider just having a DSL or Cable Modem connection to your home... I
> > have a
> > >256k (both directions) DSL for a total monthly cost of $47.49 with a dedicated
> > >IP...  That would allow you to have complete control of your system(s)...
> > 
> > This is what I have.  It's really nice, now I don't have to sit on the phone
> > with the ISP everytime I need to make some weird changes.  My line costs a
> > little more though $160 a month, but it's 768kbps sustained.  Once you start
> > hosting your own stuff off of a DSL, you won't want to go back.
> > 
> > Jay
> > 
> > -
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> 
>