Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!bywater!acheron!archet!larouch!jparnas
From: jparnas@larouch.UUCP (Jacob Parnas)
Newsgroups: comp.dcom.modems
Subject: Microcom QX/V.32c evaluation
Message-ID: <361@larouch.UUCP>
Date: 2 Aug 89 06:28:46 GMT
Reply-To: jparnas@larouch.UUCP (Jacob Parnas)
Organization: Larouch Headquarters, Hopewell Junction, NY
Lines: 30

I've finally was able to test the Microcom QX/V.32c at 38400 baud.  I am
very impressed with its performance.  All tests were done between two 
IBM RT/PCs running the latest release of 4.3 BSD and two Microcom QX/V.32c
modems with Version 1.5 of the EPROMS.  The RTs both had Dickens Data 
Systems intelligent 8 Port I/O boards.

During normal tip session, I got over 3300 cps effective throughput 
catting a 115000 byte /etc/hosts file.  Interactive response was fantastic.
There were delays on character echos.  Simply amazing throughput.

SLIP response was fairly good as well.  I'm runing generic 4.3 BSD SLIP.
Cating /etc/hosts over slip went at about 2600-2700 cps.  ftp of /etc/hosts
went at about 2.2 kilobytes/second.  Binary files seemed to ftp at between
1.2 and 1.5 kilobytes/second.

On the down side, character echos over slip were definately slower than when
compression was turned off on the same modems.  Hopefully the soon-to-come
SLIP with header compression should solve this problem.

I believe that a recent posting stating that 38,400 support didn't help
throughput much was in error, since some things were much faster when connected
at 38400 baud than at 19200 with the same modem.

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| Jacob M. Parnas                    | DISCLAIMER: The above message is from |
| IBM Thomas J. Watson Research Ctr. | me and is not from my employer.  IBM  |
| Arpanet: jparnas@ibm.com           | might completely disagree with me.    |
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