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Taking a Look at the SDL System


In this tutorial, you will use the example SDL system called inres (short for Initiator-Responder). This system is an example of a simplified communication protocol intended to give a secure transfer of information over an unsafe communication medium. It provides a one-way, connection-oriented communication service that uses sequence numbers and retransmission to ensure that messages sent to the initiator side, are correctly received at the responder side.

Start this tutorial by taking a look at the inres SDL system:

  1. Copy the inres directory from $telelogic/sdt/examples/ (on UNIX) or \IBM\Rational\SDL_TTCN_Suite6.3\sdt\examples\ (in Windows) to your working directory and make sure that you have write permission.
  2. Start TTCN Suite.
  3. Open the example SDL system called inres.sdt located in the inres directory.
  4. Select SDL Overview in the Generate menu in the Organizer, to generate an overview of the SDL system.
    The Generate SDL Overview dialog is opened. You do not have to change any settings in this dialog.
  5. Click the Generate button in the Generate SDL Overview dialog.
    The SDL Editor is opened and displays the overview.
    The block Station_Ini in System inres is the protocol that you are going to create a test for. However, due to the test architecture that is to be used, the tester can not access the lower service access point of the protocol. Since TTCN Link assumes that the channels to/from the environment are accessible for the tester (and will correspond to PCOs in the test suite), the block Medium, that models the underlying service provider, is included in the SDL system.

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