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Integrator’s Reference Manual
5-32 80-99208-1 Rev. D
Data Rate and Throughput
For asynchronous data, the GSP-1620 modem offers full
duplex transmit and receive at a Data port rate of somewhat
less than packet data’s 9600 bps, due to additional overhead
for asynchronous data. Similarly, the measured effective
“user” throughput (that is, customer data) is somewhat less
than the 7400 bps (average) for packet data. Asynchronous
connections take longer because of PSTN modem training
time.
Tip
QUALCOMM Globalstar packet data service has a lower overhead and
faster connection time than asynchronous data does. If your SCADA
application does not specifically need asynchronous data, use packet
data instead.
Mobile-Originated Asynchronous Data Calls
The GSP-1620 modem lets the application device (DTE)
connected to it originate an asynchronous data call.
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Steps
TO MAKE A MOBILE-ORIGINATED ASYNCHRONOUS DATA CALL
■ Use the ATD<dial string> command.
The modem returns
CONNECT if the call has been
established (for other result codes, see Dial (D) on page
6-20).
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Steps
TO HANG UP AN ASYNCHRONOUS DATA CALL
1. Enter Online-Command mode by using the in-band
control data escape sequence, “
+++” surrounded by guard
time (for details, see Change from Online to
Online-Command Mode (+++) on page 6-40).
2. Use the
ATH command.
Note
The ATH777 command, which hangs up a packet data call and leaves
dormant mode active, will also hang up an asynchronous data call.