Lantronix MSS4 Installation Manual

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Contents

Lantronix MSS4 Installation Manual Manual pdf 59 page image

Troubleshooting Modem ConfigurationB-4Modem Configuration ChecklistMost modem problems are caused by cabling mistakes or incorrect modem configuration. However, thefollowing items should be verified after any modem configuration, and checked again when there is modemtrouble. The modem must be configured to disconnect immediately when DTR is de-asserted. The modem must assert CD (or DSR, if connected) when connected to another modem. It must notassert CD when disconnected. The modem may optionally assert CD during outbound dialing. The modem and MSS must agree on the flow control method and baud rate scheme. The modem must not send result codes or messages to the MSS except optionally during outgoingcalls. The modem should be set to restore its configuration from non-volatile memory when DTR isdropped. The modem should be configured to answer the phone if incoming connections are to be supported.Generally this is done with the ats0=1 command. The modem should not be configured to answer the phone unless the MSS asserts DTR. Modem control must be enabled on the MSS. Using modems on ports without modem control enabledwill lead to security problems. The Autobaud feature should be enabled only when required.Entering Commands at the Boot PromptIf the Boot> prompt appears on the serial console instead of the Local> prompt, one of two things may bewrong. Either the MSS does not have enough information to boot, or the network or flash reloadingprocedure has failed. If pressing the Return key does not display a prompt, press any other key. The Boot>prompt should appear.If the MSS does not have enough information to boot, or the network or flash reloading procedure has failed, it willprint a message to the console and wait ten seconds for serial port activity. If the MSS detects serial port activity, itwill continue booting provided the flash is good. However, if the user presses a key during that time period, the MSSwill display the Boot> prompt.Note: If you see the message “Will attempt another download in x minutes,” press any key forthe Boot> prompt.A series of commands called Boot Configuration Program (BCP) commands can be entered at the Boot>prompt to configure the MSS. These commands are a subset of the entire MSS command set. For example,a typical TCP/IP configuration might use the following commands:Figure B-1: BCP Command ExamplesBoot> CHANGE IPADDRESS 192.0.1.229Boot> CHANGE SOFTWARE /tftpboot/MSS4.SYSBoot> CHANGE LOADHOST 192.0.1.188Boot> CHANGE SECONDARY 192.0.1.22Boot> FLASH% Initialization begins in 5 seconds.....