Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!netcom!gandrews
From: gandrews@netcom.COM (Greg Andrews)
Newsgroups: comp.dcom.modems
Subject: Re: Slow modems
Summary: Take a look at the S71 and S73 displays.
Message-ID: <1991Mar20.013712.14269@netcom.COM>
Date: 20 Mar 91 01:37:12 GMT
References: <1991Mar19.145538.1002@keinstr.uucp>
Distribution: usa
Organization: Netcom - Online Communication Services  UNIX System {408 241-9760 guest}
Lines: 40

In article <1991Mar19.145538.1002@keinstr.uucp> brinich@keinstr.UUCP (Mark Brinich) writes:
>
>Ever since we switched over to a Meridian PBX (which is connected to 
>our local switching office via T1 lines) we've seen a considerable 
>degredation of throughput on our modems.  For example, when we connect 
>to uunet via our T2500 we're seeing 600-800 char/sec throughput.  That's 
>not too surprising with uunet, but I also see it with a local feed.  I'm 
>including my T2500 register settings here, if that's of any help:
>
>  [register dump deleted]
>

The modem's configuration isn't real useful, especially if they worked
well before you got the new PBX.

What you really want to do is examine the S71 and S73 displays while
the modem is connected in PEP mode.  Connect to another PEP modem in
PEP mode and after you've logged into the system to the point where it
won't disconnect on you, use +++ to get your modem's attention and look
at the modem's carrier allocations with ATS71?  and ATS73?.

Compare that with the same displays when two PEP modems are connected
back-to-back with a phone cable, and you'll have an idea of how your
modems are doing with the new PBX and how they would do over an 'ideal'
connection.

>
>But we're seeing lousy throughput with all our modems (some can't even 
>send reliably at 2400 baud).  
> 

I noticed that no error correction was enabled in your settings.
Do you turn error correction on when you dial out?


-- 
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|  Greg Andrews   |       UUCP: {apple,amdahl,claris}!netcom!gandrews    |
|                 |   Internet: gandrews@netcom.COM                      |
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