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Regarding your hops. A tracert shows 2 things. One is the number
of hops to get from point A to Point B. The other is the response
time for each of the individual servers to respond to your ping. As it
was explained to me by the guy who wrote PingPlotter (an excellent
trace program), the times you see are NOT additive, so if you have
15 hops at 200ms/hop, that is NOT 3 seconds. The worst case
scenario would be the time of the longest ping. And even that
should be suspect, because the "ping" function is a lower priority
function than others on a server (which is what you'd want because
you're more interested in your data getting there fast than knowing
how long it takes to get there), so that could falsely add some
milliseconds to your calculation.
I know that 200 milliseconds * 15 hops does not equal 3 seconds
because I use internet phone software and when talking on the real
phone and the internet phone to the same person at the same time, I
often get a delay of less than a second even when the tracert shows
15 hops at 200 seconds each.
One more thing. I'd look for another DSL provider. 250-300ms is
way too slow. I typically get about 180-220 with my dial-up 56K. I
will definitely agree with you about the AT&T bottleneck in Chicago.
I have quite often had pings of 1000-3000ms on some AT&T
chicago routers!!!
Date sent: Mon, 30 Aug 1999 17:39:35 -0500
From: Gene Spaulding <genebs@xxxxxxx>
Send reply to: genebs@xxxxxxx
To: cashc@xxxxxxxxxxxx
Subject: Re: PCQuote , eSignal et al
> Re your comments about data. We have been using BMI/Sat for four years and
> with the exception of the infamous Galaxy tumble, has been OK for us. ( We day
> trade equities with the tick data. We also run a DSL line for our internet
> service. Your comments regarding location are too true. Fron Dallas to Chicago or
> New York our tracernet consistantly shows 200-350ms per hop! That is per hop and
> from Dallas to New York 2-4 seconds is about par for the course. There is an AT&T
> switch located between Chicago and New York that really chokes up 8:30 to 10:00
> and 1:30 to 3:00. One will always be at the mercy of slow switches regardless
> whether one is running frame relay for 56k. I pass on internet for data supply.
>
> Cash wrote:
>
> > >
> > > We are long time BMI sat users for very short term intraday trading and will
> > > need some convincing that the internet is up to the challenge. BMI says
> > > eSignal is faster than sat.
> > >
> > You've GOT to be kidding. I ran some tests with some other BMI users
> > about 9 months ago and it was HORRENDOUS. The quotes were
> > CONSISTENTLY 5-30 seconds behind! How can you trade very short term
> > intraday (I'm thinking seconds to minutes) with that?
> >
> > I found PCQuote to be generally right on when compared with a leased-line
> > feed, however, you could notice some internet "burps" from time-to-time.
> > However, I'd rather have an occassional 2-5 second delay and an infrequent
> > 10-20 second delay as opposed to the consistent delays from BMI.
> >
> > I suggest you put them side-by-side and see for yourself. Remember, what
> > anyone says here will be based on 1. Their ISP, 2. Their equipment, 3. Their
> > location in the world in relation to the closest server farm. As serious
> > intraday trades, these are tests you must run yourselves.
> >
> > >From a technical standpoint, your satellite signal travels about 53,000 miles
> > further than your internet signal. Do the math... 53,000 miles divided by
> > 186,000 miles/sec =~ .29 seconds longer. Talking with IBM reps some
> > while back, they told me that a satellite transmission would take longer than
> > an internet transmission that didn't encounter congestion. So, make your
> > ISP the same as your quote vendor's to reduce the number of hops even
> > more.
> >
> > > May be, but as professional traders, we would appreciate your users
> > > comments.
> > >
> > > Please included comments about any other internet based data sources
> > > compatible with TS 2000i also.
> > >
> > > Thanks !
> > >
> > > Peyton Morgan
> > > Editor@xxxxxxxxxxxxxxxxx
> > > http://www.TradersDigest.com
> > >
>
>
"Buy Low, Sell High"
(If this statment is used for financial gain, I am entitled to 10% of all profits. ;) )
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