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6.6.5 CELLULAR MODEM WATCHDOG
As of with firmware V3.5.2u13 and later, when you check the Enable Dial-Out check-box at System > Dial, you will be given the option
to configure a cellar modem watchdog service.
This service will periodically ping a configurable IP address. If a threshold number of consecutive attempts fail, the service will cause
the unit to reboot. This can be used to force a clean restart of the modem and its services to work around any carrier issues.
6.6.6 DUAL-SIM FAILOVER
Some console server models allow you to insert two SIM cards, allowing for selective connection to two carrier networks. The dual-
SIM failover feature allows the cell modem to selectively failover to the secondary SIM when communication over the primary SIM
fails.
To configure dual-SIM failover:
Navigate to System > Dial.
Click the Internal Cellular Modem tab.
In the SIM Configuration section, set the Primary SIM to either Bottom Slot or Top Slot.
Choose the slot which contains the SIM from your primary carrier network.
Check the Enable SIM Failover checkbox.
Specify how the device will failback from the failover SIM to the Primary SIM.
There are two options:
- On Disconnect. With this option the console server will failback to the Primary SIM only after the connection on the failover SIM has
failed its ping test.
- On Timeout. With this option, the console server will failback to the Primary SIM after the connection on the failover SIM has been up
for the timeout period.
If On Timeout is the selected failback option, set the Failback Timout value.
- The Failback Timout is the number of seconds the failover SIM must be connected before the console server switches back to the
Primary SIM.
- If no number is entered here, the default value of 600 seconds (10 minutes) applies.
Configure each SIM connection with the information necessary (APN, and, if required, the PIN, Phone Number, Username and
Password) to enable it to make a successful connection, assuming sufficient signal strength from the cell service provider.
See Sections 6.6.1 through 6.6.3 for details.
Enter a Failback Test IP address for each SIM.
This IP address is used to ping test the status of the cell modem connection and to determine if SIM failover or failback is to take
place.
Optionally configure DDNS and the Modem Watchdog (see Section 6.6.5).
DDNS, when configured, will be applied to the cell modem dial out connection regardless of which SIM is currently in use.
NOTE: Dual-SIM failover is for dial-out connections only.
CHAPTER 6: FIREWALL, FAILOVER AND OOB ACCESS
