Subject: Function set 102 not applicable to APPN ENs

From: "Candy Elder" <[email-masked]>
Date: Tue, 27 Sep 94 13:25:32 EDT

Reference: Your note, same subject, attached below

Matthew,
      Base functions for APPN Architecture Versions 1 and 2, in
Appendix A of the APPN Arch. Ref. (SC30-3422-3) are ISR functions.
Each of those should have indicated ISR as part of their name.
The endpoint session options for independent LU6.2-LU6.2 (and hence
CP-CP) sessions are defined in the "IBM SNA LU6.2 Reference: Peer
Protocols" (SC31-6808-1) with TNL SN61-0102.  See page 4-34,
Figure 4-10, the TS Usage section.  The Adaptive Pacing Support field
is fixed to "Adaptive Pacing" at the BIND sender and echoed in the
RSP(BIND).  Note that since the receiver echoes the BIND's Adaptive Pacing
Support field value in the RSP(BIND), this accommodates back-level LU6.2
implementations that indicated Fixed Pacing in their BINDs.
All IBM CP BIND senders choose Adaptive Pacing in conformance with Figure 4-10.

Regards, Candy
------------------------  Referenced Note  ----------------------------
To: aiw-appn-reference <@MIT.EDU:[email-masked]>
Cc: [email-masked]
Subject: Function set 102 not applicable to APPN ENs
From: [email-masked] (Matthew Finlayson)
Date: Tue, 27 Sep 94 16:56:47 BST
Sender: [email-masked]

Dave,

An EN must contain an independent CP LU, which must support pacing of
some description. This makes the function set applicable to ENs, and
the only question is whether it should be base or an option.

In addition, the description of function sets is rather woolly on the split
between CP, Path Control and LU function. Function sets 041 and 042 refer to
Session RU segmentation and reassembly. Segmentation is implemented in Path
Control, but reassembly is architected as part of the LU. Function set 041
is listed as being optional for an EN (and 042 is base) - indeed with HPR
support both will become base for ENs.

Our opinion is that, because of the performance benefits, 031 should be
base for ENs.

==============================================================
Matthew Finlayson                   Data Connection Limited
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                                    Fax:       +44 81 367 8501