5. Security3160-A2-GB24-10 March 2001 5-5Acquiring/Releasing the User InterfaceYou can access the user interface from either the front panel, the COM port, theMODEM port (for standalone DSU/CSUs), or the SDCP (for carrier-mountedDSU/CSUs). The DSU/CSU allows only one user interface to be active at a time.The front panel is the default user interface at power-on or after a reset. It is alsothe default during a software download or when a failure occurs at either the localor remote PC interface.You can switch an inactive user interface to active if: The current active user interface has had no activity (no key was pressed) forat least five minutes. The active user interface has been released with the Release command. The active interface connection is broken. This includes the call disconnect fora modem interface or the termination of the front panel emulation program ona locally attached PC (if the PC supports DTR) or the termination of the asyncterminal interface on a remote or locally attached terminal.Acquiring the Active User InterfaceTo acquire the active user interface, press any key. If you are using the PCinterface, use the mouse to click on the desired Function key.The top-level menu screen appears on the active user interface, regardless ofwhat screen was displayed at the previous active user interface.The inactive interface displays the following message when a Function key ispressed or a connection is made on the inactive user interface and control cannotbe switched because the currently active interface is in use. On the screen, eitherFt. Panel (front panel), Com Port, Modem, or SDCP is displayed in the userinterface (User I/F) field.F1 F2 F3DSU ESFStat Test CnfigF1 F2 F3DSU ESFUser I/F active
