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- From: bjorndahl@augustana.ab.ca
- Newsgroups: comp.dcom.modems
- Subject: Re: NeXT/Supra modem performance question
- Message-ID: <1992Nov7.180909.9732@augustana.ab.ca>
- Date: 7 Nov 92 18:09:09 MST
- References: <lfamnpINN30q@ai.cs.utexas.edu> <1992Nov4.135519.1963@blaze.cs.jhu.edu>
- Organization: Augustana University College, Camrose, aAlberta
- Lines: 40
-
- In article <1992Nov4.135519.1963@blaze.cs.jhu.edu>, swiet@syzygy.cs.jhu.edu (Alexander Swietlicki) writes:
- > In article <lfamnpINN30q@ai.cs.utexas.edu> yu@cs.utexas.edu (Yeong-Ho Yu) writes:
- >>I have a NeXT mono station with Supra V32bis modem.
- >>I used C-Kermit 5A(182) to transfer a file between my
- >>NeXT and my work place system.
- >>
- >>Most recent transaction --
- >> packet length : 89 (send), 90 (receive)
- >> effective data rate : 183 cps
- >> efficiency (percent) : 4
- >>I don't understand why the efficiency is so low.
- >>Am I doing something wrong?
- >>I would appreciate any help.
- >
- > I have a 25Mhz mono slab and a SupraFAXModem v.32bis as well.
- > I use tip and sz/rz. At 14,400 bps, with compression, I calculate
- > average cps around 1650. If you insist on using kermit (which, IMO, is
- > very inefficient, and lacking, compared to zmodem), try doing, after
- > putting the remote kermit in server mode:
- >
- > set receive packet 9024 (or as high as the remote will allow)
- > set send packet 9024
- > set block 3
- > (set file type binary)
- >
- > (or add these to .kermrc's everywhere!) :)
- >
- > Throughput should be a bit better, but not great.
-
- In addition to larger packets, do a "set win 7" or higher to engage sliding
- windows (it is implemented in the VMS version of C-Kermit 5A, so I assume
- it must be in various Un*x versions). That made the most difference to
- throughput here. On text files I've had throughput of >1500 cps between a
- MicroVax whose DTE speed is no faster than 19,200 baud and an MS-Dos
- machine, both using Supras at 14,400 baud and with V.42bis operating. Not
- as good as sz, but not bad either.
-
- --
- Sterling G. Bjorndahl, bjorndahl@Augustana.AB.CA or bjorndahl@camrose.uucp
- Augustana University College, Camrose, Alberta, Canada (403) 679-1516
-