22 Apr
2001
22 Apr
'01
10:37 p.m.
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