Technical Description - Motorola G24 Guide Developer's Manual

MUX Integration
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Receive Incoming SMS indication
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Inquiry GSM coverage indication
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Setup a voice call (while G24 is in GPRS session)
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Send & Receive SMS
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Read/write to/from Phone Book
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Local modem operation
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Network interrogation and settings

Technical Description

The MUX feature adds five virtual channels on a single physical RS232 line:
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Channel #0 - DLC0 for MUX Control
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Channels #1 through #4 are used for Data/Fax, GPRS, Voice call and control, and
Logger/External modem applications
1-14 AT Commands Reference Manual December 31, 2007