[HECnet] DECnet et al

[Johnny Billquist]

On 2011-07-17 21.06, hvlems at zonnet.nl wrote:
Decnet 3 is compatible with phase 4. DEC was great with upward compatibility.

Yes. I was more thinking of how much a Phase III router could route in a Phsae IV network. I know I've seen the documentation for this somewhere, at some point. I just can't remember the details on exactly how compatible that detail was. Phase III endnodes worked well in Phase IV.

I thought ethernet (10 Mb/s, thickwire) ws from 1977, VMS is about the same age.

The Ethernet as we know and use it (really ethernet II) was published in 1982. The first version, which looked pretty much the same, but which allocated other protocol numbers (before low numbers became reserved for 802.n) was published in 1980. DECnet phase IV came around somewhere around 1982 or 1983 unless my memory fails me. (After Ethernet II, but pretty soon after, I believe). It might have been something like 1984 as well, though.

Phase III was pretty new, if it had even been introduced by 1977.
(Ah, looking at wikipedia, Phase III didn't arrive until 1980, while phase IV was indeed 1982).

	Johnny

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-----Original Message-----
From: Johnny Billquist<bqt at softjar.se>
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Date: Sun, 17 Jul 2011 20:48:42
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Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] DECnet et al

On 2011-07-17 20.35, hvlems at zonnet.nl wrote:
DECnet phase 4 is about as old as ethernet and VMS.   Ethernet was the main driving force for phase 4 owing to the large number of adjacent nodes and the sheer number.

Not really. Phase IV is about as old as ethernet, yes. VMS is older...

Phase 3 does not have areas and only recognizes 255 hosts max. It did have circuit routing (of course)

Yes. About the same thing as L1 routing. I think it might even be
partially compatible, within the restrictions on the number of nodes...

	Johnny

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-----Original Message-----
From: Gregg Levine<gregg.drwho8 at gmail.com>
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Date: Sun, 17 Jul 2011 14:26:07
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Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] DECnet et al

On Sun, Jul 17, 2011 at 2:24 PM, Bob Armstrong<bob at jfcl.com>     wrote:
A bridge (hw) maintains a list of mac addresses it sees at each port.

    FWIW, that's a "switch" at least in the common usage of the word over
here.

Bob



Hello!
I agree! Now first things first. When did DECNET first appear? And
more importantly, based on what systems and using what means to
connect each system.


-----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."