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- From: luigi@iet.unipi.it
- Subject: How to slow down Ethernet cards ?
- Message-ID: <1992Dec29.175813.13563@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: Tue, 29 Dec 1992 17:58:13 GMT
- Lines: 28
-
-
- It might sound as a weird idea but... I'd like to know how easy it is
- to slow down an Ethernet controller in order to work at a slower speed,
- say something between 500 Kbit/s and 2Mbit/s. At least the 82586 I know
- for sure had 2 separate clocks, one for the controller, the other for
- data communication, and the two were completely independent and
- asynchronous, thus speeds other than 10Mbit/s should be easy to
- achieve.
-
- Other ethernet boards I have (e.g. WD8013, 3C501, 3C503, 3C507) have
- only one 20MHz oscillator, so things might be different. Does anybody
- know more ?
-
- [If you're curious why I'm asking this: it would make a cheap
- communication interface using medaia which cannot carry the full
- ethernet b/w. And it would be less time consuming for the PC than
- running RS232 at 115.2 kbps and interrupting on each character. Of
- course some CSMA/CD parameters (e.g. packet lenght) might need some
- change as well, but that can be solved.]
-
- Thanks
- Luigi
- ====================================================================
- 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
- ====================================================================
-