To Control Data Connections (Pdp Contexts) - COBHAM Satcom EXPLORER 540 User & Integrator's Manual

3.5 To control data connections (PDP contexts)

3.5.1 Automatic Context Activation (ACA)
In the web interface you can set up the EXPLORER 540 to automatically establish a
data connection when it is registered on the satellite network. See Automatic Context
Activation (ACA) on page 4-7. Automatic Context Activation also applies to the "wake-
on" actions after power save mode (see Power control on page 3-19) and by recovery
after e.g. loss of power.
If the terminal is in Cellular modem preferred mode or Cellular modem preferred
(PRISM) mode, ACA is mandatory on both the cellular and the BGAN connection, i.e. a
data connection is automatically established on both networks.
3.5.2 Connection watchdog (Link monitoring)
If you are not using the Terminal watchdog function, or if you need to monitor your
individual data connections, it is strongly recommended to use the Connection
watchdog function to monitor your IP connection, as it enables you to test the BGAN
(or cellular) connectivity and to keep your PDP context alive.
With this feature 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 Tertiary IP address, if available. If no response is received from
any of the IP addresses, the terminal will eventually restart.
For setup with the web interface, see Connection watchdog (Link monitoring) on
page 4-34.
For setup with SMS command, see WATCHDOG: Get or set watchdog parameters on
page 3-7.
Note
3.5.3 Terminal watchdog
The Terminal watchdog monitors the terminal to ensure that it remains operational. It
continuously monitors valid system time (UTC) and CS attach (the BGAN circuit-
switched connection) status. Additionally, at regular intervals set by the user, the
Terminal watchdog can wake up the terminal from power save, start a data
connection and verify a positive response to a ping request, and send a position SMS
or a loopback SMS to verify SMS connection.
Note
For configuration with the web interface, see Terminal watchdog on page 4-36.
For configuration with SMS command, see ADVWATCHDOG: Get or set Terminal
watchdog parameters on page 3-7 and SMS remote commands on page B-4.
98-148232-K
The Connection watchdog does not work with PRISM.
Unlike the Connection watchdog, the Terminal watchdog does not check
your individual BGAN (or cellular) data connections - it only sends ping
requests on the data connection set up by the Terminal watchdog itself.
Chapter 3: Operation
To control data connections (PDP contexts)
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