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Product Features
2.5.3 Technical Description
The MUX feature adds three virtual channels on a single physical RS232 line:
• Channel #0 - DLC0 for MUX Control
• Channel #1 - DLC1 for MUX Data, used for Data/Fax/GPRS
• Channel #2 - DLC2 for MUX Data, used for AT command
2.6 SENDING SMS
2.6.1 Overview
The SMS feature provides the means for transferring messages between the g20 and the terminal, and the reporting of SMS
reception events.
g20 SMS implementation is based on the GSM 07.05 specification.
2.6.2 Features and Benefits
The SMS, as defined within the GSM 900 / 1800 / 1900 digital mobile phone standard, has several unique features:
• A single short message can be up to 160 characters of ASCII text in length (7-bit coded). Message text can comprise words,
numbers or an alphanumeric combination.
• Short messages can be written and displayed in various coding schemes, including ASCII and UCS2.
• Reception of an incoming message can invoke an indication to the terminal. This feature is configurable using the command
AT+CNMI.
• Short messages can be sent and received simultaneously with GSM voice, data and fax calls.
• Cell broadcast messages can also be selected and received on the g20. The g20 enables registration to specific broadcast
channels.
Note
The MUX will be supported in g20 software phase 2.
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