Section Four
Cellular Phone Configuration
The placement of the cellular phone and antenna is critical to the success of the communications session. The antenna placement should be adjusted until the maximum signal strength is observed on the cellular phone signal indicator. Under some circumstances a special high gain antenna may improve performance.
Additional information regarding the use of the cellular phone and cellular network should be obtained from the service provider or cellular phone manufacturer.
Outgoing Cellular Call
From a communications software standpoint, making an outgoing call using cellular or a landline differs only in the initialization string. Once the cellular driver has been uploaded the Modem will dynamically switch between cellular operation and landline operation.
Whenever the Modem is instructed to make an outgoing call (i.e ATD command), it will determine if it is possible to make a cellular call; if it’s not, it will revert to a landline based call. As the user, it is up to you to ensure that cellular conditions (cellular cable is connected, cellular phone is powered on, etc) are ready for operation prior to instructing the Modem to make an outgoing call.
The initialization string sent to the Trumpcard for cellular connections may not result in the optimum connection when used for landline connections. If possible, set the communications software to send the desired initialization string based on the type of connection being used.
Refer to the section Making an Outgoing Call for details on how to command the Modem to make outgoing calls
Incoming Cellular Call
The Trumpcard is capable of receiving incoming cellular Modem calls. From a communications software standpoint, receiving an incoming call using a cellular or a landline link differs only in the initialization string. Once the cellular driver has been uploaded, the Modem will dynamically switch between cellular operation and landline operation.
Whenever a cellular phone connection exists between the Trumpcard and the cellular phone, only incoming calls from the cellular phone will be detected. If a cellular phone connection does not exist it will revert to monitoring for landline based incoming calls.
As the user, it is up to you to ensure that the cellular environment (cellular cable is connected, cellular phone is powered on, etc) is ready for operation prior to accepting incoming cellular Modem calls.
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