4 LOGGING IN U SING M ODEMIntroduction The administrator can log in to the console port of a remote switch using amodem through PSTN (public switched telephone network) if the remote switch isconnected to the PSTN through a modem to configure and maintain the switchremotely. When a network operates improperly or is inaccessible, you can log in tothe switches in the network in this way to configure these switches, to query logsand warning messages, and to locate problems.To log in to a switch in this way, you need to configure the terminal and the switchproperly, as listed in the following table.Configuration on theAdministrator SideThe PC can communicate with the modem connected to it. The modem is properlyconnected to PSTN. And the telephone number of the switch side is available.Configuration on theSwitch SideModem Configuration Perform the following configuration on the modem directly connected to theswitch:AT&F ----------------------- Restore the factory settingsATS0=1 ----------------------- Configure to answer automatically after the first ringAT&D ----------------------- Ignore DTR signalAT&K0 ----------------------- Disable flow controlAT&R1 ----------------------- Ignore RTS signalAT&S0 ----------------------- Set DSR to high level by forceATEQ1&W ----------------------- Disable the modem from returning command response and the result,save the changesYou can verify your configuration by executing the AT&V command.Table 16 Requirements for logging in to a switch using a modemItem RequirementAdministrator side The PC can communicate with the modem connected to it.The modem is properly connected to PSTN.The telephone number of the switch side is available.Switch side The modem is connected to the console port of the switch properly.The modem is properly configured.The modem is properly connected to PSTN and a telephone set.The authentication mode and other related settings are configuredon the switch. Refer to Table 6.
