RE: (PM) Average bandwidth per dial-up port...

Kevin Sawyer (sawyerk@apci.net)
Sat, 1 May 1999 00:20:47 -0500

> At 18:29 -0700 4/30/99, Kevin Sawyer wrote:
> >What is a good figure for the average amount of Internet (not local
> >POP3/SMTP/HTTP) bandwidth needed per dial-up port?
>
> Here is one data point:
>
> We have 8 T1s for dial-in and one T1 to the internet. We only support
> Email, http, https, ftp, and news. The T1 tends to run at
> about 75% busy
> under heavy load. It all depends on what the users do with their
> connections. Most of ours surf the web.

So you have between 184 and 192 dial-up ports, right? Do you fill them?
When they're full, you still only use 75% of your T-1?

I'm currently putting 230 ports (10 PRIs) against a T-1 (no other traffic)
and according to MRTG it that T-1 peaks out at about 170K/s inbound and
20K/s outbound when all 230 ports are full. 192K/s is the theoretical
maximum for a T-1, so I think I'm probably over-booking it a bit. I've done
several dial-up tests while all 230 ports are in use and I've always been
able to download 4K/s+, so I'm not too worried about it just yet...

However, I've always wondered if anyone had a reliable rule-of-thumb...

--Kevin
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