Digi TS 4, TS 2/4 manual Tips on Configuring a Modem

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Tips on Configuring A Modem

Here are some tips on configuring modems to work with Digi One/PortServer TS 2/4:

Configure the modem so that DCD goes high when it receives an incoming connection request.

Configure the modem to answer an incoming call only when DTR is high, and to drop the line when DTR goes low.

For bidirectional connections, it is advisable to configure the non-volatile parameters in the modem for incoming calls. Also configure the modem to reset to these parameters when DTR is dropped.

Configure the modem to lock the serial line speed at the highest baud rate the modem will accept for reliable data transfer because Digi One/PortServer TS 2/4 cannot switch the baud rate of the serial line on a per call basis without reconfiguration.

Note: You may want to consider connecting modems using RealPort, a feature that allows network-based host systems to use the ports of the Digi One/PortServer TS 2/4 as though they were the host system’s own ports. It is an easy and efficient way for modems to use Digi One/PortServer TS 2/4 ports. For information on this option, see "Configuring Ports for RealPort" on page 3-1.

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Tips on Configuring A Modem

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Contents 92000307B Page Contents Configuring DNS Configuration Examples Page Introduction This ChapterSetup Overview About Entering Commands on the Command Line About This GuideSupported Devices Access Resource CD Card Other Documents in the LibraryAbout Configuration Methods Downloading a Configuration FileAccessing the Command Line from a Telnet Session Configuration PrerequisitesLogging On As Root from the Command Line Accessing the Configuration from the Web InterfaceConfiguring the IP Address Options for Configuring the IP Address and Mask OptionsConfiguring the Ethernet Interface with DPA-Remote ProcedureStarting Point Configuring the IP Address Using Ping-ARP Manual Configuration Procedure Configuring the Ethernet Interface from the Command LineConfiguring an IP Address using Dhcp and Rarp Manual Configuration ExampleConfiguring an IP Address using Dhcp and Rarp Configuring Ports for RealPort Configuration Options What is RealPort?Configuring the RealPort Software About RealPortConfiguring Ports Web Interface Configuring Ports for RealPort Command Line ExampleConfiguring Ports for Printers Configuration Considerations Tips for telnet and rsh Printing Configuring Ports for Printers Web InterfaceConfiguring Printer Connections Command Line Related InformationConfiguring Printer Connections Command Line Configuring a Port for Direct-Access Printing Configuring a Port for Direct-Access Printing Configuring Ports for Modems Tips on Configuring a Modem Configuring Ports for Modems Web Interface Before You Begin Configuring Ports for Terminals Configuring Ports for Terminals Web Interface Configuring Ports for Terminals Command LinePort Defaults Configuring Typical PC Connections About Computer ConnectionsAbout Computer Connections Configuring Autoconnection Configuring a Port for Autoconnection Web Interface Configuring Autoconnection By Port Command LineAbout Autoconnection Configuring a User for Autoconnection Web Interface Configuring a User for Autoconnection Command LineConfiguring a User for Autoconnection Command Line Configuring PPP Configuring PPP Connections Web Interface Configuring Inbound PPP Connections Command Line Configuring Inbound PPP Connections Example Configuring Outbound PPP Connections Command Line Set user name=name n1=telephone-number Configuring IP Routing What is Routing Introduction to RoutingTypes of Routing About RIP Routing Updates Digi One/PortServer TS 2/4 Participation in RIP Updates Configuring Static Routes Example Route Using the Ethernet InterfaceExample Route Using a PPP Link Configuring Dynamic Routes Using RIP Example Dynamic RoutesConfiguring Proxy ARP Configuring Proxy ARP Configuring Console Management Configuring Console Management Web Interface Configuring Console Management Command LineAbout Console Management Example SSH2 and Menu Access Example Alternate IP Addresses10-4 Configuring About Modbus Configuring Modbus Using the Web Interface Configuring Modbus from the Command Line 11-5 Configuring Network-Connected Masters Configuring a Port-Connected MasterExamples Configuring Security Features Options for Removing Access Restriction Controlling Access to Inbound PortsDefault Access Restrictions Procedure for Changing a Port’s Access RequirementsRestricting Access to Outbound Ports Controlling Access to Outbound PortsDefault Access Method 1 AutoconnectionIssuing User Passwords Configuring SSH Version 2 for Secure Communication Password ProtectionUsing a Public Key 12-6 Configuring DNS About the Domain Name System Configuration Procedures Procedure for Using a Name ServerProcedure for Using a Host File 13-4 Configuring Snmp About Snmp and the Digi One/PortServer TS 2/4 Agent Configuration Procedure Web Interface Configuration Procedure Command LineConfiguration Example 14-4 Configuring Users About Configuring Users Common User FeaturesConfiguring a User Web Interface Configuring a User Command Line Examples Managing the OS and Configuration Upgrading the OS Firmware Web Interface Upgrading the OS Firmware Command Line Prerequisite TaskRules for Editing a Configuration file Configuring Digi One/PortServer TS 2/4 from a Remote HostWhen To Use Remote Configuration Copying the Configuration File to a HostCpconf fromhost=199.250.121.12cnfg-fle Resetting the Configuration to Defaults Configuration Examples Configuration Notes Terminal Server Configuration Without RealPortConfiguration IllustrationTerminal Server Configuration Using Autoconnection Terminal Server Configuration Using RealPort Digi One/PortServer TS 2/4 Troubleshooting Symptom Digi One/PortServer TS 2/4 Does Not Boot ProceduresSymptom Cannot Telnet to the Digi One/PortServer TS 2/4 AssumptionsSymptom Trouble Accessing a Port Running Digi One/PortServer TS 2/4 Customer DiagnosticsTroubleshooting Tftp Problems Key to Interpreting Digi One/PortServer TS 2/4 LEDsVerifying Tftp on a Unix System Kill -1inetdPID Verifying the Digi One/PortServer TS 2/4 IP Address Checking for Duplicate IP AddressesPinging an IP Address Verifying the Network Cabling HP-UX Verifying the RealPort Process Verifying the RealPort ProcessAIX Verifying the RealPort Process Linux Verifying the RealPort ProcessWindows NT Verifying the RealPort Service Windows 2000 Verifying the RealPort ServiceSolaris Verifying the RealPort Process Digi Contact Information Digi International Bren Road East Minnetonka, MN18-12