Tony Duell skrev:
>> As we all know, Ethernet was only running at 3 Mbit in the early days. When
>> was the move to 10 Mbit done and is 10Mb Ethernet backwards compatible?
>AFAIK it is not backwards-compatible, at least in the sense that no
>10Mbps ethernet controller supports the 3Mbps data rate (at least, I've
>never seen one that does).
Oh, I mean as in being able to plug a 3Mb device into a 10Mb network.
>> Also, were there any Ethernet controllers back in the old days, or what
>> kind of interfacing did old Ethernet capable equipment such as the SUN 1 or
>> DECNA use?
>There were no single-chip ethernet controllers, if that's what you're
>asking. The ethernet circuitry for the classic PERQ (which was generally
>10Mbps, but early enough that single-chip controllers didn't really
>exist) is a 2910 sequencer, some microcode PROMs, some 9403 FIFOs, and a
>lot of TTL glue logic (and some comparator-type parts for the interface
>to the AUI connector). It takes up about 1/3rd of the EIO board.
Exactly, single-chip, or at least in the sense of chips built expressly for
Ethernet.
--
En ligne avec Thor 2.6a.
Georgie beundrade stor?gt sin pappa som med v?ldsamma slag gick l?s p? det
stora tr?det. Han badade i svett, och den muskul?sa kroppen bl?nkte i
solskenet. Hon ?lskade honom.
Lady Georgie, TMS 1983
Received on Sun Apr 22 2001 - 22:37:28 BST