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Using ASPs and PDUs in Behaviour Trees


In this section we will expand our example a bit further and show how the sequencing of ASPs w.r.t. time is expressed in TTCN behaviour descriptions.

Figure 26 : An N_DATArequest, carrying a CR_PDU, is sent over the network

It results in the IUT generating an X_CONNECTindication, which is responded to by the UT tester sending an X_CONNECTresponse. This results in an N_DATAindication, carrying a CC_PDU, appearing at the LT.

Figure 27 : The above scenario can be expressed as two TTCN behavior trees

Note the introduction of the OTHERWISE statement.


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