While looking for DECnet documents, I noticed that there's a very large
collection at http://manx.classiccmp.org/collections/antonio/dec/ . Probably
not news to many, but in case some had not seen it...
Among other things, there are two CD collections MDS-1997-10 and MDS-2000-01.
The former contains a rather obscure document, the DECnet Phase IV Token Ring
datalink spec. That also includes the Phase IV routing layer tweaks necessary
to support token ring -- or other datalinks if you don't want to use the
AA-00-04-00 prefix.
paul