Black Box LES1208A-R2, LES1332A, LES1408A, LES144BA Cellular routing, Cellular CSD dial-in setup

Specify the Probe Addresses of two sites (the Primary and Secondary) that the console server is to ping to determine if the principal network is still operational

In event of a failure of the principal network the 3G network connection is activated as the access path to the console server (and its Managed Devices). Only HTTPS and SSH access is enabled on the failover connection (which should enable the administrator to connect and fix the problem)

Note: By default, the console server supports automatic failure-recovery back to the original state prior to failover .The console server continually pings probe addresses whilst in original and failover states. The original state will automatically be set as a priority and reestablished following three successful pings of the probe addresses during failover. The failover state will be removed once the original state has been re-established.

For earlier firmware that does not support automatic failure-recovery, to restore networking to a recovered state the following command then needs to be run:

rm -f /var/run/*-failed-over && config -r ipconfig

If required, you can run a custom bash script when the device fails over. It is possible to use this script to implement automatic failure recovery, depending on your network setup. The script to create is:

/etc/config/scripts/interface-failover-alert

You can check the connection status by selecting the Cellular panel on the Status: Statistics menu

oThe Operational Status will change as the cellular modem finds a channel and connects to the network

oThe Failover & Out-of-Bandscreen will display information relating to a configured Failover/OOB interface and the status of that connection. The IP Address of the Failover/ OOB interface will be presented in the Failover & Out-of-Bandscreen once the Failover/OOB interface has been triggered

5.7.3Cellular routing

Once you have configured carrier connection, the cellular modem can be configured to route traffic through the console server. This requires setting up forwarding and masquerading - as detailed in Chapter 5.8.

5.7.4Cellular CSD dial-in setup

Once you have configured carrier connection, the cellular modem can be configured to receive Circuit Switched Data (CSD) calls.

Note: CSD is a legacy form of data transmission developed for the TDMA based mobile phone systems like GSM. CSD uses a single radio time slot to deliver 9.6kb/s data transmission to the

GSM Network and Switching Subsystem where it could be connected through the equivalent of a normal modem to the Public Switched Telephone Network (PSTN) allowing direct calls to

any dial-up service. CSD is provided selectively by carriers and it is important you receive a Data Terminating number as part of the mobile service your carrier provides. This is the number which external modems will call to access the console server

Select the Cellular Modem panel on the System: Dial menu

Check Enable Dial-In and configure the Dial-In Settings

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