Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!ubc-cs!idacom.cs.ubc.ca!viola
From: viola@idacom.cs.ubc.ca (Viola Lee)
Newsgroups: comp.protocols.iso
Subject: Help on Some protocols
Message-ID: <4917@ubc-cs.UUCP>
Date: 8 Sep 89 20:36:06 GMT
Sender: news@cs.ubc.ca
Reply-To: viola@idacom.cs.ubc.ca (Viola Lee)
Organization: UBC-Idacom Joint Research Project
Lines: 24

Hi,

I have some questions about the user data of some pdus in the 
following protocols. Are the following pdus correct if all 
fields are correct except for the fact that the user data field 
is not present? Please give references of where you obtain
your answers from.


-----------------------------------------------------------------------------
Protocol |  Data Related PDU          |(Y/N) | References (CCITT, ISO, etc)
---------|----------------------------|------|------------------------------- 
LAPB     | I frame                    |      |
         |                            |      |
Network  | Data and Interrupt Packets |      |
         |                            |      |
Transport| DT and ED TPDUs            |      |
         |                            |      |
Session  | DT and EX SPDUs            |      |
----------------------------------------------------------------------------- 

Thanks in advance,

viola