H-13160-A2-GB21-80 March 1999Asynchronous Terminal OperationHOverviewYou can configure and manage the DSU/CSU from an asynchronous (async)terminal that is configured for 9.6 kbps, 8 characters, no parity, and 1 stop bit.This appendix provides operational examples to help you become familiar withthe use of the async terminal for DSU/CSU control.By convention throughout this appendix, examples of screens are shown as theyappear with the standalone 4-port DSU/CSU.Before Using the Asynchronous TerminalYou can connect the async terminal directly to the COM port of the DSU/CSU, oryou can establish a remote connection using dial-in (via the integral modem) orTelnet access.Before using the async terminal, you may use the DSU/CSU’s front panel to setcertain configuration options for async terminal operation. Use the Configuration(Cnfig) branch of the front panel menu and edit the User Interface (User)configuration options for async terminal operation. Refer toChangingConfiguration Options in Chapter 3,Operation, and Appendix C,ConfigurationOptions.To connect the async terminal to the DSU/CSU using Telnet access, refer toConfiguring the DSU/CSU for SNMP or Telnet Access in Chapter 3,Operation.If the DSU/CSU is misconfigured, leaving it in a state that does not support asyncterminal operation, the recovery procedure consists of power cycling theDSU/CSU, waiting for the completion of the power-up self-test, and then pressingthe async terminal’s Return key five times in succession. (Begin pressing theReturn key within two seconds after the completion of power-up self-test, and donot wait longer than one second between each successive key press.) Thisprocedure allows you to use the System Paused screen to reset the COM portconfiguration options or to reload all factory default configuration options.
