[ih] Protocol layering

Dave Crocker dhc2 at dcrocker.net
Sun Dec 4 17:28:23 PST 2005

> There are references to 1978 versions of both X.200 and 7498.  But I’ve 
> not been able to find an actual copy of either. (Also, assuming a copy 
> is available, do we still need to satisfy ITU/ISO distribution 
> restrictions for these old drafts?)

I seem to recall having specification of the original 7-layer model come out 
in 1976, but perhaps that was not the final version of that round of effort.

And as long as you have raised the subject, I will share with folks an 
historical perspective that I've enjoyed about the effect that producing the 
7-layer model had:

Before it existed, networking technical discussions among people meeting for 
the first time usually took the first half of the meeting to agree on terms 
of reference and the second half doing real work.

The OSI 7-layer model was revolutionary.

After it came out, similar first-time meetings consumed the first half, 
complaining about the OSI model, and the second half using it.



Dave Crocker
Brandenburg InternetWorking

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