home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky rec.ham-radio.packet:11 sci.electronics:21796
- Newsgroups: rec.ham-radio.packet,sci.electronics
- Path: sparky!uunet!noc.near.net!news.Brown.EDU!qt.cs.utexas.edu!yale.edu!yale!gumby!wupost!zaphod.mps.ohio-state.edu!rpi!ghost.dsi.unimi.it!newsserver.di.unipi.it!pical2!luigi
- From: luigi@iet.unipi.it
- Subject: How to slow down PC Ethernet boards ?
- Message-ID: <1992Dec31.150428.20998@cli.di.unipi.it>
- Originator: luigi@pical2
- Sender: luigi@iet.unipi.it
- Nntp-Posting-Host: pical2.iet.unipi.it
- Reply-To: luigi@iet.unipi.it
- Organization: Dip. di Ingegneria dell'Informazione, Univ. di Pisa (ITALY)
- Date: Thu, 31 Dec 1992 15:04:28 GMT
- Lines: 26
-
-
- Did anybody try to slow down commercial ethernet boards for the
- IBMPC (e.g. 3Com, WD, Novell...) in order to send data at speeds
- between (say) 500kbit/s and 2Mbit/s ? This way it should be easier than with
- 10Mb ethernet to send the data across a radio/IR link. The advantages
- are:
- - faster than RS232 ports;
- - PC ethernet boards are pretty cheap nowadays;
- - Ethernet boards are packet oriented rather than character
- oriented, so they won't kill your PC for processing interrupts.
-
- If memory serves, some Ethernet controllers (82586, WD8390 ?) have
- separate clocks for the controllers and TX shift register; other
- controllers might be similar. The only thing I don't know is how slow
- the TX clock can go. Apart from this, the patch should be trivial and
- reversible.
-
- Any information appreciated.
- Thanks
- Luigi Rizzo
- ====================================================================
- Luigi Rizzo Dip. di Ingegneria dell'Informazione
- email: luigi@iet.unipi.it Universita' di Pisa
- tel: +39-50-568533 via Diotisalvi 2, 56124 PISA (Italy)
- fax: +39-50-568522
- ====================================================================
-