104 C HAPTER 7: T ROUBLESHOOTING FOR W INDOWS 3. XFigure 60 Assembling a Loopback PlugStarting the Group 2 TestFollow these steps to run the Group 2 test on either the3C509B-TPC or 3C509B-COMBO NIC:1 Connect the loopback plug to the round BNCconnector on the NIC.2 Start the Configuration and Diagnostics Program,as described in “Starting the DOS Configuration andDiagnostics Program” on page 102.3 From the Test menu, select Test Setup.4 Enable the Group 2 test. Select OK and press Enter.5 Go to the Run Tests dialog box to start the tests.6 After the test is completed:a Exit the Configuration and Diagnostics Program.b Remove the loopback plug.Running the Group 3 TestThe Group 3 test is the Echo Exchange Test. It tests to see ifthe NIC can transmit and receive data while connected tothe network. If you have successfully run the Group 1 andGroup 2 tests, a failure in the Group 3 test usually indicatesa cabling, hub, or network problem.CAUTION: Do not use an active network to run theGroup 3 test.50ΩTerminator50ΩTerminatorT connector
