Lantronix MSS100, 1-T2 manual Modem Conﬁguration Checklist

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Troubleshooting

Modem Configuration Checklist

B.5 Modem Conﬁguration Checklist

Most modem problems are caused by cabling mistakes or incorrect modem conÞguration. However, the following items should be veriÞed after any modem conÞguration, and re-checked when there is modem trouble.

¥The modem must disconnect immediately when DTR is de-asserted.

¥The modem must assert CD (or DSR, if connected) when connected to another modem. It must not assert CD when disconnected. The modem may optionally assert CD during outbound dialing.

¥The modem and MSS must agree on the ßow control method and baud rate scheme.

¥The modem must not send result codes or messages to the server except optionally during outgoing calls.

¥The modem should be set to restore its conÞguration from non- volatile memory when DTR is dropped.

¥The modem should be conÞgured 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 conÞgured to answer the phone unless the MSS asserts DTR.

¥MSS Modem control must be enabled. Using modems on ports without modem control enabled will lead to security problems.

The MSS Autobaud feature should be enabled only when required.

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Contents Serial Server Installation Guide Part Number Contents Contact Information Troubleshooting Pinouts Iii Page Introduction Protocols TermsConﬁguration SoftwareConfiguration Introduction MSS Components InstallationMSS LEDs InstallationInstallation Power-up Diagnostics 4Pinging the MSS Is It Working?Page Getting Started Using an ARP Entry and the Ping Command Using EZWebConIP Address Conﬁguration 1Entering ARP and Ping Unix Using the Serial Console Using a DHCP, BOOTP, or Rarp ReplyControlling Incoming Logins Incoming LoginsEZWebCon Login and Conﬁguration Rlogin Serial Port LoginsOther Incoming TCP/IP Logins Incoming LAT LoginsStarting Outbound Connections Remote Console LoginsTelnet 2 SPX Logout3 LAT Basic Conﬁguration Command SetSystem Passwords Privileged PasswordProtocol Conﬁguration Login Password1 TCP/IP Parameters 2 IPX/SPX Parameters LAT Parameters Serial Port ConﬁgurationBasic Configuration Serial Port Configuration Change Preferred SPX None Otherwise, only Telnet console port connections are possible Page Incoming Connections Using the MSSSocket Connections 1.1 TCP/IP Socket Connections LAT Connections1.2 IPX/SPX Socket Connections 4Reducing Flow Control Host ApplicationsSession Control Local SwitchInteractive Connections Code Examples8DeÞning Switches Backward and Forward SwitchesDisconnect and Resume Outgoing ConnectionsSession Limits 2.3 SPX 10Connecting with Rlogin2.4 LAT 12Connecting to a ServiceStatus Displays Show Sessions Show Server CharacteristicsShow Services Show Server CountersMssb Emulating a Direct Serial ConnectionMultihost Mode 15Setting the MSS for Multihost Mode 1 Conﬁguring Multihost ModeMultihost Mode Using the MSS Contact Information LANtronix Problems and Error Messages TroubleshootingTable B-1Problems and Error Messages, Etc/services Þle? Bootp TroubleshootingEntering Commands at the Boot Prompt Tftp TroubleshootingFigure B-1BCP Command Examples Entering Commands at the Boot Prompt Troubleshooting Modem Conﬁguration Checklist Page RJ-45 Connector DB25 ConnectorPinouts DSR Data Signal Ready versus CD Carrier Detect Modem WiringDTR Data Terminal Ready Obtaining New Software Updating SoftwareVia FTP Figure D-1Lantronix FTP Session Via a ModemUpdating Software Reloading MSS Software Reloading MSS SoftwareNetWare Figure D-3Reloading Flash ROM using NetWare3 MOP 2 TCP/IPTftp Troubleshooting Flash ROM UpdatesRelative Humidity Limitations Power SpeciﬁcationsTemperature Limitations SpeciﬁcationsPage Warranty Statement EMC Declaration of ConformityIndex-i IndexIndex-ii Loadhost 4-3, 5-9, B-6Index-iii Telnet 1-4, 5-1