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Developing Modem Applications
80-99208-1 Rev. D 5-25
Dormant Mode Service
With dormant mode service, the Globalstar system can keep
the IP session “up” at the application layer (host and SCADA
applications) while dropping the air link/traffic channel, to
conserve Globalstar resources and to decrease billing time to
the user. The traffic channel is automatically reestablished
upon receipt of PPP traffic at the SCADA application end or
IP traffic at the Globalstar Gateway. The Globalstar system
then completes the transmission, with no loss of user data.
Dormant mode can be entered in two ways:
• By issuing the
ATH777 command to the Control port, as
opposed to using the standard
ATH (hang up) command,
which would drop the traffic channel and terminate the
PPP session.
• By using a timer. The idle timer default value is currently
0 (timer is turned off). You can specify a time between 10
and 255 seconds for the idle timer to time out and tear
down the traffic channel.
During dormant mode operations, each use of the traffic
channel to send and receive PPP data will produce one billing
record (called a Call Detail Record or CDR).
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Steps
TO SET UP DORMANT MODE AND TEST HOW THE CALL GETS
RE-ESTABLISHED
1. On the Control port, set the idle timer by typing:
ATH+CTA=10 <CR>.
This command sets an idle timer value of 10 seconds.
Note: you can specify a termination character other than
<CR> for AT commands; see Command Line Termination
Character (S3) on page 6-25.
2. Type
AT&C0 <CR> to ensure that RLSD (DCD) will remain
asserted in dormant mode.