1 /*" No" */; send signal L_SetParmResp to << Block DLCb dispatch, press Go and select 1 /* "No" */; check that the MSC trace is compliant with Figure 3.4. B. Simulate data transfer from A to B, described in Figure 3.6: send signal L_DataReq with parameters 0 and 86 to << Block DLCa >> dispatch, press Go, select 1 /* "No" */. C. Simulate DLC release, described in Figure 3.8: send signal L_ReleaseReq with parameter << Block DLCa >> dispatch, press Go and select 1 /* "No" */ two times. D. Save the simulation commands into the file testl.com, as indicated previously (Log > Save Input History), because you will need it later. E. Open the file testl.com with a text editor, and if necessary add a return in all the lines like: Go 1 /* "No" */ Next-Transition 1 /* "No" to split them: 1 /* "No" */ Next-Transition 1 /* "No" */ Remove the two lines: Define-MSC-Trace-Channels on Start-Interactive-MSC-L 0 Here is the content of testl.com: Set-GR-Trace 1 Next-Transition Next-Transition Next-Transition Next-Transition Output-To L EstabReq (0) <<Block DLCa>> dispatch Next-Transition Next-Transition Next-Transition 1 /* "No" * / Next-Transition Output-To L EstabResp <<Block DLCb>> dispatch Next-Transition 50 Validation of Communications Systems with SDL Next-Transition ext-Transition 1 /* "No" * / Next-Transition lext-Transition Output-To - L_SetparmReq <<Block DLCa>> dispatch 1 /* "No" * / Output-To L SetparmResp <<Block DLCb>> dispatch 1 / "No" * / Output-To L_DataReq (0, 86) <<Block DLCa>> dispatch 1 / "No" * / Output-To L_ReleaseReq (0) <<Block DLCa>> dispatch 1 / * "No" * / 1 /* "No" * / Save the file and close the text editor. Do not exit from the Simulator. 4.2.2.4 Generate a black box MSC The MSC generated in Figure 4.13 contains all the model process instances. You will now generate a more abstract "black box" MSC, containing only the blocks (DLCa, dataLink and DLCb), to validate the external behavior of the system: A. In the Simulator, select File > Restart and press OK. B. Type the command Define-MSC-Trace-Channels on 