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Cable modems can be very fast, but they share bandwidth in the
neighborhood, so speed goes down if your neighbors are all playing Quake.
But speed isn't the issue, reliability is. Cable modem reliability can be
worrisome for data collection as well. And then there are the things you
can't control at all, like the backbone you're on (and the path to it).
Allan
At 08:34 PM 9/22/99 -0700, Brian Massey wrote:
>What about cable modems compared to DSL? How many links there? I've been
>told speeds in cable modems rival T1 lines which would make it faster than
>most standard DSL installtions.
>
>-----Original Message-----
>From: Allan Kaminsky [SMTP:allan@xxxxxxxx]
>Sent: Wednesday, September 22, 1999 6:29 PM
>To: Jim Johnson; omega-list@xxxxxxxxxx
>Subject: Re: interpretting PingPlotter
>
>Now you're seeing the side of Internet data delivery that DBC doesn't want
>to talk about.
>
>You know the one about how a chain is as strong as its weakest link. There
>are a lot of links between you and DBC's server.
>
>I have DSL here. I've seen failures in the Central Office, the ATM cloud,
>and upstream failures from there. There can be failures at the backbone
>provider, etc.
>
>If you put in a T1 line (upwards of $2K / month) which comes with a
>performance guarantee, you still are only guaranteed 99%. Think about the
>outages that reliability figure can cover. And that gets you 24/7 support
>with a 1 hour response time. Something you don't get with DSL.
>
>Compare that with the reliability of satellite. Obviously, a bird can (and
>has) go down. It's still orders of magnitude more reliable, which is
>something to ponder if your trading dollars are on the line.
>
>Allan
>
>At 07:57 PM 9/22/99 -0400, Jim Johnson wrote:
> >I'd appreciate any comments, suggestions about my Signal Online problem.
> >
> >I use DSL through BellAtlantic.net with a backup of Erols.com as ISP and
> >a 56K modem. Either wasy, I occasionally get fade outs of quotes. Of
> >course this usually occurs just after I enter a daytrade. the signals
> >returns after 30 seconds to 10minutes.
> >
> >When I run PingPlotter I show very good speed to each of the 10-20 hops
> >to DBC's server. When they run PingPlotter, they show good speed up to
> >2-3 hops from me and then long times causing "time outs". Of course
> >they say that is my ISP's issue. Seems to me what their data mean is
> >that their signal is not getting to servers "near" me.
> >
> >Is my interpretation correct?
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