Westermo MRD-455 Application Note
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Summary of Contents for Westermo MRD-455
- Page 1 APPLICATION NOTE AN-003-WUK DUAL SIM FAILOVER Connection Management Dual SIM Failover...
- Page 2 Introduction Overview The Westermo MRD-455 is a compact, DIN rail mountable dual SIM mobile 4G router. The dual SIM failover feature has been developed for 2 main reasons. The first being for mobile applications, where the router is installed in vehicles, boats, trains etc and likely to be moving between strong and weak areas of coverage by different mobile providers.
- Page 3 Configuration Wireless 4G Link Browse to Wireless Packet Mode SIM 1 Click Add new profile and create a profile for your first SIM card provider. APN: Enter the APN (Access Point Name) given by your SIM card provider. NB: Standard 4G tariffs do not often require authentication. Dual SIM Failover...
- Page 4 Configuration Wireless 4G Link SIM 2 For SIM 2 click Add new profile again and create a profile for your second SIM card provider as you did for SIM 1 Set the connection mode to Always connect and associate SIM 1 and 2 to the appropriate profile. Dual SIM Failover...
- Page 5 Configuration Dual SIM Failover – Basic Method The basic method will fail-over to the second SIM card if the router is unable to bring up the 4G link or if it loses network registration. NB: The basic method will not monitor the health of an active 4G link. Dual SIM Failover - Basic Option 1 –...
- Page 6 Configuration Dual SIM Failover – Basic continued... Option 2 – Fall back to primary SIM card after a specified time. The following example will cause the 4G link to fail-over to the secondary SIM but the link will retry the primary SIM after a specified time. NB: This method is suitable if you have a preference for the primary SIM.
- Page 7 Configuration Dual SIM Failover – Advanced Continued from the settings applied in the chapter headed Dual SIM Failover – Basic. The advanced dual SIM failover mode actively monitors the ability to transfer data of the 4G network. It works by generating ICMP pings from the 4G link over the mobile network to a reliable, always available, fixed public IP address.
- Page 8 Configuration Remote Poll Setup Here you set the poll type and the IP addresses to poll. Important: It is crucial to poll IP addresses that are fixed, reliable and always on. If the addresses go offline then the router will assume there has been a link failure, disconnect the 4G link and enter recovery mode.
- Page 9 Testing Basic Dual SIM Failover Testing If you have configured basic failover only, (chapter Dual SIM Failover – Basic), disconnect the antenna and try to reduce the signal level so that the primary SIM loses network registration. Browse to Status System Log If the router fails to re-establish the link on SIM 1, it restarts the RF module after a specified number of failed establishment attempts and then activates SIM 2.
- Page 10 Testing Advanced Dual SIM Failover Testing If you have configured advanced Dual SIM failover (chapter Dual SIM Failover – Advanced), then test as per the basic method but also temporarily point the monitoring pings to an IP address which you can control and block the pings (or to an address that does not exist). This will simulate a faulty link and will force the router into recovery mode.
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Page 11: Sms Triggers
SMS Triggers As an additional failsafe, the SMS Triggers option, are a very usful feature to have if you think the remote router has lost its connection and doesn’t seem to be recovering. The following settings are disabled by default. The router needs only to GSM registration only to receive and send SMS messages and does not need to be connected to the 4G network for the SMS function to work. - Page 12 Revision history for version 1.0 Revision Rev by Revision note Date Dual SIM Failover...
- Page 13 Dual SIM Failover...
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