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Q139636: X400: Abbreviations for CCITT Recommendation X.224

Article: Q139636
Product(s): Microsoft Mail For PC Networks
Version(s): MS-DOS:3.0,3.2
Operating System(s): 
Keyword(s): 
Last Modified: 18-NOV-1999

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The information in this article applies to:

- Microsoft Mail Gateway to X.400, versions 3.0, 3.2 
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SUMMARY
=======

This article lists some of the acronyms that are seen when you view the
X400MMDD.LOG file, where mmdd represents the month (mm) and the day (dd) the log
was written when debug (-LD) was enabled.

MORE INFORMATION
================

Data Units
----------

  TPDU           Transport Protocol Data Unit
  TSDU           Transport Service Data Unit
  NSDU           Network Service Data Unit

Types of Transport Protocol Data Unit
-------------------------------------

  CR TPDU        Connection Request TPDU
  CC TPDU        Connection Confirm TPDU
  DR TPDU        Disconnect Request TPDU
  DC TPDU        Disconnect Confirm TPDU
  DT TPDU        Data TPDU
  ED TPDU        Expedited Data TPDU
  AK TPDU        Data Acknowledge TPDU
  EA TPDU        Expedited Acknowledge TPDU
  RJ TPDU        Reject TPDU
  ER TPDU        Error TPDU

TPDU fields
-----------

  LI             Length Indicator (field)
  CDT            Credit (field)
  TSAP-ID        Transport Service Access Point Identifier (field)
  DST-REF        Destination Reference (field)
  SRC-REF        Source Reference (field)
  EOT            End of TSDU mark
  TPDU-NR        DT TPDU number (field)
  ED-TPDU-NR     ED TPDU number (field)
  YR-TU-NR       Sequence number response (field)
  YR-EDTU-NR     ED TPDU number response (field)

Time and associated variables
-----------------------------

  T1             Local retransmission time
  N              The maximum number of retransmission's
  L              Time bound on reference and sequence numbers
  I              Inactivity time
  W              Window time
  TTR            Time to try reassignment/resynchronization
  TWR            Time to wait for reassignment/resynchronization
  TS1            Supervisory timer 1
  TS2            Supervisory timer 2
  MLR            NSDU lifetime local-to-remote
  MRL            NSDU lifetime remote-to-local
  ELR            Expected maximum transit delay local-to-remote
  ERL            Expected maximum transit delay remote-to-local
  R              Persistence time
  AL             Local acknowledge time
  AR             Remote acknowledge time

Miscellaneous
-------------

  TS-user        Transport Service user
  TSAP           Transport Service Access Point
  NS-provider    Network Service Provider
  NSAP           Network Service Access Point
  QOS            Quality of service

The information above was extracted from The International Telegraph and
Telephone Consultative Committee (CCITT), Recommendation X.224, Section 4, page
43. Please refer to Recommendation X.224 for a more in-depth definition and
description.

For additional information on the X400MMDD.LOG, please see the following article
in the Microsoft Knowledge Base:

  Q86988 X400: How MTAs Initiate and Communicate


Additional query words: 3.00 3.20

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Keywords          :  
Technology        : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGatex400300 kbMailGatex400320
Version           : MS-DOS:3.0,3.2

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