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- From: mjp3783@ritvax.isc.rit.edu
- Subject: Re: How do I get LIGHTNING on my SupraFAX?
- Message-ID: <1992Jul24.020020.18818@ultb.isc.rit.edu>
- Sender: news@ultb.isc.rit.edu (USENET News System)
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- Reply-To: mjp3783@ritvax.isc.rit.edu
- Organization: Rochester Institute of Technology
- References: <1992Jul22.085505.13897@vax5.cit.cornell.edu>,<1992Jul22.192418.6462@wam.umd.edu>
- Distribution: comp
- Date: Fri, 24 Jul 1992 02:00:20 GMT
- Lines: 71
-
- In article <1992Jul22.192418.6462@wam.umd.edu>, walrus@wam.umd.edu (Udo K Schuermann) writes:
- >Well, here's my bit of advise on how to maximize your throughput with high
- >speed modems. I'm basing this on my SupraFAX V.32bis modem but it should
- >apply to similar modems as well:
- >
- >1. Read the documentation on your modem to let it select the best connect
- ^^^^^^^^^^^^^^^^^^^^^^
- always RTFM! ;-D
- > speed. There are a lot of options available but loading the factory-
- > settings #2 (at&f2, I believe) has worked quite well for me.
- >
- >2. Avoid XON/XOFF. Set your serial-preferences to CTS/RTS, which allows
- > the modem and the computer to do handshaking via dedicated hardware
- > lines.
- >
- >3. Use the highest speed between your modem and your computer that doesn't
- > cause you loss of data. Rough rule of thumb: KS1.3/68000: 19200 baud.
- > KS2.04/68000: double that; accellerated machines: use 57600.
- >
- > The modem will stop your computer via CTS/RTS if your computer goes too
- > fast, and if stuff comes in from the other system slower than your
- > actual connection between modem and computer, then your computer will
- > simply not get things as quickly as it is able to.
- >
- >4. Video modes: watch the modem receive light. If the light goes off and
- > your screen is still scrolling text, then your display is lagging behind.
- > Your choices are to increase the pre-scroll (VLT has it, I don't know
- > about other software), reduce the number of bitplanes/colors of your
- > terminal.
- >
- >5. Protocol: use streaming protocols, such as zmodem. Zmodem transmits
- > without having to stop until the other end complains because of errors
- > or whatever. This means that there is no "transmit-ACK/NAK" cycle and
- > transfer is as fast as reading and writing the information to disk
- > allows. I don't know how Ymodem-G and other protocols work, but I
- > suspect it's more a features thing from there on, rather than
- > performance.
-
- Use Ymodem-g - it is similar to zmodem, but has no error recovery. It is a bit
- faster and if there is an error, (under JR-Comm, at least) you can recover
- using zmodem!
-
-
- >
- >
- >Miscellaneous tidbits:
- >
- >Because of error-correction protocols being handled in hardware,
- >transmission errors are less frequent with V.42bis/MNP modems.
- >
- >I run VLT at a priority of 2 to make sure the process is never blocked by
- >any of the things that *I* do. This reduces the chance of more stuff
- >coming in on the modem side than the computer can swallow at once.
-
- If you don't want to multi-task, set priority to that of input.handler.
-
- >
- >
- >I hope the above is helpful to others who are curious or wondering how to
- >get the most out of their fast modem. If anyone has anything to add to
- >this, please let us hear it.
- >
- > ._. Udo Schuermann "If I went around calling myself emperor just because
- > ( ) walrus@wam.umd.edu some moistened bint lobbed a scimitar at me, they'd
- > Seeking virtual memory put me away!" -- Monty Python's "Holy Grail"
- ,------------------------------------------------------------------.
- | Watch the starlight shooting for the sky Reaching out to catch |
- | a piece of paradise. Is it true or is it just imaginations? |
- | Visions twist around my mind and bring me shelter from the night |
- | Michael Phipps == mjp3783@ritvax.isc.rit.edu (R.I.T.) |
- `------------------------------------------------------------------'
-