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In article <1992Dec16.230520.9801@nosc.mil> psm@nosc.mil (Scot Mcintosh) writes:
>Does anyone know of books, articles, or other kinds of
>documents that would be of help to someone implementing
>the X.25 protocol? In particular, somento excruciating detail in terms of how
to handle
>the interface for each state and event that could
>take place would be of great benefit. ...



When SPRINT was TELENET, there used to be a loose-leaf document
called the [GTE]TELENET X.25 Implementors' Guide.  It did give
guidance on buffer management, etc.  I don't know if it 
still is available, and it was about $1000 in the 1980s.
   Another, less obvious, is the conformance test suite,
ISO 8882-2 for the frame layer and ISO 8882-3.  This will give
an example of virtually every state transition, and a test for
it.  This standard will not help with internal implementation,
but it is a much better specification than the base protocol.
   I was the development team leader for the Corporation for
Open Systems' X.25 tester, and formerly network management
architect for TELENET.  Given this and other experience, I
would hesitate to start an X.25 implementation from scratch,
simply because the size of the task.  There are decent portable
software packages commercially available (e.g., Spider Systems).
I would tend to start with one of those as a base, and customize
from there. 
   Since I've done X.25 implementation, I would not personally
need a consultant during the implementation,but I would suggest
some source of advice for a first-timer.  An OEM software 
vendor may be able to give you enough support, or there are
qualified consultants.

Howard