[19622] in North American Network Operators' Group
Re: And we thought the text part of the Starr Report would be bad
daemon@ATHENA.MIT.EDU (Paul Zawada)
Fri Sep 18 16:02:52 1998
Date: Fri, 18 Sep 1998 14:53:17 -0500 (CDT)
From: Paul Zawada <zawada@ncsa.uiuc.edu>
To: Jerry Scharf <scharf@vix.com>
cc: nanog@merit.edu
In-Reply-To: <199809181858.LAA06707@bb.rc.vix.com>
On Fri, 18 Sep 1998, Jerry Scharf wrote:
> > The standard T1 connection of an Internet service provider handles a
> > maximum of 53 dialup connections pumping data to a user, he said, but a
> > 54th user could cause a major problem."
> >
>
> The number of dialups on a T1, the number of bytes in a framed ATM cell.
> I see a telco conspiracy here. (:-) for the humor impaied)
It could be a conspiracy, or it could be they multiplied 28.8 kbps times
53 and 54... :-) It took me a few minutes to figure out how they came up
with those numbers as well.. They used the wrong figure for a T1 though..
You can only fit 1.536 Mbps of real data down a T1 unless you've figured
out a funky way to send it across using the framing bits.
8 b per channel * 24 channels per frame * 8000 frames per s = 1536000 bps
28.8 kbps * 53 = 1.526 Mbps
28.8 kbps * 54 = 1.555 Mbps
So technically they should have used the numbers 52 and 53. :-)
--zawada
Paul J. Zawada, RCDD | Senior Network Engineer
zawada@ncsa.uiuc.edu | National Center for Supercomputing Applications
+1 630 686 7825 | http://www.ncsa.uiuc.edu/People/zawada
