Re: [NTISP] Bandwith considerations

Carolyn Smith ( (no email) )
Wed, 17 Mar 1999 20:03:14 -0500

The way that people told me to calculated was to multiple 56 times the
number of phone lines you would be using. However, this is actually invalid
because you will rarely ever have a user using the full 56K unless they are
just a bandwidth hog. You just have to kind of start our with so much and
see how your users use it. Also, peak times of usage will effect the amount
of bandwidth you need.

For instance, we currently have 96 lines and a 384K Fractional t1. During
off peak times our bandwidth usage is only about 1/3 of this 384K. During
peak times the bandwidth usage is almost 100 percent. We are in the process
of installing a full T1 because we are also installing more dial-up lines.

You could probably safely say 500 users to a full T1 of bandwidth. You may
also want to look at T3's but I'm really not familar with those.

----- Original Message -----
From: Carlo Gibertini <>
To: <>
Sent: Wednesday, March 17, 1999 6:48 PM
Subject: [NTISP] Bandwith considerations

>I have a costumer thinking in open an ISP with 5000 telephone lines, and
>asking me about how many bandwidth he will need.
>Can some good soul point in the directions to calc this?
>Carlo Gibertini
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