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 applicatio n layer (host and SCADA
applications) while dropping the air link/traf fic channel, to
conserve Globalstar resources an d to decrease billing time to
the user. The traffic channel is automatically reesta blished
upon receipt of PPP traffic at the SCADA applica tion 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 ente red 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 id le timer default value is c urrently
0 (timer is turned off). You can specify a tim e 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 traffi c
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 comman ds; see Command Line Termination
Character (S3) on page 6-25.
2. TypeAT&C0 <CR> to ensure that RLSD (DCD) will remain
asserted in dormant mode.