COBHAM Satcom EXPLORER 540 User & Integrator's Manual page 98

4.13.7 Connection watchdog (Link monitoring)
If you are not using the Terminal watchdog function (see Terminal watchdog on
page 4-36) nor PRISM, it is strongly recommended to use the Connection watchdog to
monitor your IP connection, as it enables you to test the satellite (or cellular)
connectivity and to keep your PDP context alive.
Note
The function is slightly different if you are using the cellular network with the optional
EXPLORER 540 Cellular Modem installed. The function is described below for BGAN
only and then for cellular connection.
Note
Function with BGAN only
With the connection watchdog activated, the terminal will send out ping commands to
up to three servers of your choice. When a data session is started, the terminal will
start sending ping commands to the Primary IP address the number of times specified.
If no response is received, it will send the same number of ping commands to the
Secondary and then the Tertiary IP address, if available. If no response is received from
any of the IP addresses, the terminal will first try to reconnect (if ACA is enabled). If it
fails again the terminal will eventually restart.
Ping commands are sent on all active data connections. For the Connection
Note
watchdog to work, the data connection must be (re)started after enabling the
Connection Watchdog. If ACA is enabled, the data connection is restarted
automatically. See To start and stop data connections on page 4-5.
Function with optional Cellular network
When using the cellular network with the connection watchdog activated, the terminal
will send out ping commands to up to three servers of your choice. When a data
session is started, the terminal will start sending ping commands to the Primary IP
address the number of times specified. If no response is received, it will send the same
number of ping commands to the Secondary and then the Tertiary IP address, if
available. If no response is received from any of the IP addresses, the terminal will
switch to the BGAN connection and repeat the pinging over the BGAN network. If it still
fails, the terminal will eventually restart.
98-148232-K
The Connection watchdog does not work with PRISM.
We recommend enabling ACA (Automatic Context Activation) if it is important
to always have an active connection. See Automatic Context Activation (ACA)
on page 4-7.
Chapter 4: Configuration with web interface
Advanced settings
4-34