Configuring a Spread Spectrum Radio with a GSM Modem
P/N 7010-0736
3-11
2. Open Modem-TPS, and select the COM port the receiver is
connected to (Figure 3-4). Click Connect.
Figure 3-4. Connect to Modem-TPS
3. On the GSM tab, set the following parameters (Table 3-4 on
page 3-11), and click Apply (Figure 3-5 on page 3-12).
If some fields display “N/A,” click Refresh.
Table 3-4. Receiver Parameters for the FCS Tab
Parameter Base Receiver Rover Receiver
Mode Select Slave. Select Master.
PIN Enter a Personal Identification Number (PIN) if required.
Dial Leave blank. Enter the phone number of the
base GSM modem.
Send time Enter a period of time in seconds in which the base/rover GSM
modem will send a service word to the rover/base GSM modem.
• This parameter is used to maintain reliable communication
between a pair of modems and avoid unnecessary modem re-
initialization.
• To ensure reliable and secure modem communication, this
parameter must be larger then the period for transmitting
differential corrections.
If the base and rover are both GR-3 receivers with internal GSM
modems, set the Send time to zero (0).
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