Forwarding data packets from LAN via X.25 (ISDN)

The TCP-X.25 bridge integrated in LCOS allows you to forward (and receive) data from a TCP/IP network via ISDN to an X.25 network. This gives you the option of setting up a backup connection in an X.25 network in case of disruption of the WAN connection.

The following steps show you how you configure the TCP-X.25 bridge on your device for these scenarios. This example is based on modern debit/credit card terminals which now commonly use only TCP/IP to communicate with a centralized server or network and in which at least two different IP addresses can be configured. On your terminal, enter your destination network or the destination server in the usual manner as the primary IP address and port. As the second IP address and port, enter the LANCOM where the terminal sends its data packets in the case that the primary destination is not available.

The LANCOM uses the settings stored in LCOS to check whether the respective data should be forwarded. If so, the device establishes a connection to the configured destination address via the ISDN interface and transparently forwards the TCP/IP data packets via X.25. The respective remote site must also be available via ISDN and support X.25.

Important: The number of logical connections via the TCP-X.25 bridge is currently limited to one. If the device receives another connection request while it already has an established connection, it will be ignored. In this case, the respective terminal must repeat its TCP connection requests until the other X.25 connection is disconnected.

Go to the console or open the table WAN > X.25-Bridge > Outgoing calls in the setup menu in WEBconfig.
Add a new data record and add the following basic information to the default settings. Please find further information about the parameters in the CLI guide or Menu Reference Guide.
- Name
- Terminal-Port
- Local-Port
- Remote-ISDN
- Local-ISDN
- X.25-Remote
- X.25-Local
Note: The Terminal IP and Loopback address are optional, but highly recommended for configurations with multiple local networks.

Note: For connections to some providers (e.g., TeleCash), it is also necessary to enter the Protocol ID and the User data.

That's it! This concludes the basic configuration of the TCP-X.25 bridge.