Subject: Update to item 8321

From: "Ed Tremblay (254-5515)" <[email-masked]>
Date: Mon, 7 Aug 95 14:23:39 EDT

During review of AMB item 8321 (Add DLUR/S processing for encapsulated
FID2 segments on CP-SVR pipe to DLUS), questions were raised about
the accuracy of the problem statement as well as the resulting solution.

I had stated that some DLURs needed to segment NMVTs because they were
too large for the DLUR to handle.  This led to proposing that the DLUR
be allowed to create segments and forward them encapsulated on the
CP-SVR pipe.

Actually, the problem was that the DLUR was receiving segments from the
downstream device and wanted to encapsulate and send the segments
without first having to reassemble them into a whole message.  There was
no requirement for the DLUR to create segments.

So, I've updated the abstract (abs8321.txt) and change pages
(arch8321d.psbin) to reflect these changes (abstract included below).
Let me know if you have any further comments.

Ed Tremblay

(Item 8321) Add DLUR/S processing for encapsulated FID2 segments on
            CP-SVR pipe to DLUS
-------------------------------------------------------------------
A requirement has been submitted by VTAM and CM/2 to support segmented
FID2 PIUs for encapsulated data transmissions received over the
CPSVRMGR pipe from the DLUR.  There are some messages which are
encapsulated and sent on the CP-SVR pipe from the DLUR to the DLUS, for
example, NMVTs, which can be received by the DLUR from the DLUR-serviced
device in segments.  Currently the DLUS does not expect to receive
encapsulated segments, only encapsulated whole messages.  If a DLUR
could encapsulate these segments, they could be sent without first
being reassembled at the DLUR.

The proposal will allow the DLUR to encapsulate FID2 PIU segments
in separate GDS X'1500's.  The only PIUs which can be sent segmented
are FMD requests, FMD responses with QRI=1, and non-expedited
DFC requests.  The segments will be reassembled at the DLUS.