jparnas@larouch.UUCP (Jacob Parnas) (07/14/89)
I finally got slip going at 19200 baud with the Microcom QX/V.32c modem. It seems to do significantly better than V.32 modems without compression such as the Telebit T2500. The best ftp performance I ever got with the Telebit in V.32 mode without compression was 900 characters/second. I just got 1800 characters/second with the Microcom on /etc/hosts. On a binary, I got 1500 characters/second. Interactive rlogin performance seems much faster with the Microcom. I expect further improvement once I get the Microcom hooked up at 38400 so it can make full use of its MNP level 9 compression. ping took a little longer. Between 279 ms and 352 ms instead of about 270-300 ms without compression. One rare ping got 233 ms, but the average seemed to be 353 ms with compression at 19200 vs about 275 without compression. This seems like a small price to pay for the improved throughput. Once we get Van Jacobson's header compression, I expect a that the compression will work even better because the compression won't be confused much by the headers since they will be so tiny. In summary, I think that the MNP level 9 compression on the Microcom is a big plus. ------------------------------------------------------------------------------ | 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. | | Bitnet: jparnas@yktvmx.bitnet \---------------------------------------| | Home: ..!uunet!bywater!acheron!larouch!jparnas | Phone: (914) 945-1635 | ------------------------------------------------------------------------------