 window appears, select System V76test and press OK : a Select Trace value window appears, select 0/* No MSC trace */ and press 52 Validation of Communications Systems with SDL D. Select Trace > MSC Level: Set: a Select Unit name window appears, select Process Block DLCa >> DLC and press OK : a Select Trace value window appears, select 2 /* Unconditional MSC trace */14 and press OK. E. Select Trace > MSC Level: Show and check that you have: Default 1 = Conditional MSC trace System V76test 0 = No MSC trace Process <<Block DLCa>> DLC 2 = Unconditional MSC trace F. Select Trace > MSC Trace: Start: a Select window appears, select 2 /* MSC with states and actions */ and press OK : the MSC Editor displays the MSC trace. G. In the Simulator, press the Send To button: select L_EstabReq and press OK, enter the value 0 for the parameter and press OK, select the target process << Block DLCa >> dispatch and press OK. H. Press Go in the Execute group. I. Each time the Select - Enter path window appears, select 2 /* "Yes" */ and press OK. As expected, the generated MSC, represented in Figure 4.15, contains only process DLC of block DLCa, and displays N320cnt plus the state of the process. You can see that the number of retransmission of SABME is correct. But now if you press on Transition, the Simulator answers: No process instance scheduled for a transition. It means that the signal DLCstopped that you see at the bottom of the MSC trace is not expected by the process dispatch: it goes into the input queue of process dispatch in block DLCa, but unfortunately under the current state of dispatch there is no input of signal DLCstopped. J. Save the MSC: in the MSC Editor, select File > Save As, navigate to the desired directory, enter retryl.msc and press OK. K. Save the simulation commands into a file: in the Simulator, select Log > Save Input History, select All files, enter retryl.com and press OK. L. Open the file retryl.com with a text editor, and if necessary add a return before each 2 in the Go line, to get the following fi