Subject: CIW FDX SIG meeting (3/16) minutes

From: [email-masked]
Date: Fri, 2 Apr 93 08:12:29 EST

Summary of the FDX SIG meeting on 3/16/93
-----------------------------------------
The Full-Duplex SIG reached consensus on an Approved Direction for the
Full-Duplex CPIC support on APPC.
For the mapping to OSI TP, some work pertaining to the interaction
between the Shared Control and Commit Functional Units remains to be done
Approved Direction for the CPIC FDX mapping to OSI TP will
be requested by the 6/93 CIW meeting.
The document with the changes approved at the CIW SIG will be put out
shortly.

Below are more details of the events at the FDX SIG.

The following two documents were circulated hard copy:
- A revised document "CPIC FDX Conversations and Expedited Data"
  dated 3/09/93 (revision of 11/30/93)
- Mapping CPIC FDX Communications (2.x) onto OSI
  Distributed Transaction Processing Services (3/15/93)
Your review comments on these documents are requested. (A soft copy
incorporating the changes agreed to at the meeting will be placed in
the document library soon.)

The following changes to the 11/30 proposal were agreed to.
-  CM_FDX_NOT_SUPPORTED would be changed to
   CM_CONV_TYPE_NOT_SUPPORTED to enable a convenient OSI TP mapping
-  Extract_Partner_Binding, that will be proposed by Mel Jones
   in the Conformance SIG, can be used to determine whether
   or not data may get purged.
     Rejected Alternate Solutions
      - New characteristic purging_mode and new Extract_Purging_Mode call
      - Return CM_ERROR_PURGING to Send_Error call and
        CM_*_ERROR_PURGING to partner program
- New secondary return codes to the CM_CONVERSATION_ENDING
  return code on the send queue, to enable OSI TP mapping
- Discussed CMSERR from Syncpt and Syncpt-Deallocate states.
   CM_STATE_CHECK will be returned.
- Return codes CM_ERROR_INDICATION (send queue) and
  CM_CONVERSATION_ENDED (expedited queues) combined
  into CM_CONVERSATION_ENDING to increase protocol stack
  transparency
     Rejected Alternate Solutions
      - return CM_CONVERSATION_ENDING to the send queue only when
        END-DIALOGUE indication is received (OSI TP specific return code)
      - CM_CONVERSATION_ENDING to the receive queue causes a
        transition to reset state
- a new return_control parameter on Receive_Expedited_Data
- Expedited data is supported iff full-duplex is supported locally
- CM_EXPEDITED_DATA_NOT_SUPPORTED is returned on OSI TP (until OSI TP
  adds exp. data support), and on SNA if full-duplex is not supported
   by either partner
- In addition, the new call Extract_Partner_Binding will be proposed by
  Mel Jones in the Conformance SIG, to indicate (indirectly)
  local support for expedited data.

Ajay Kshemkalyani
CIW FDX Coordinator