Confidential
MANUAL
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5 Functional
Description
The GM41 belongs to a new generation of Sony Ericsson modules which are intended to be used in machine-to-
machine and man-to-machine applications. They are used when there is a need to send and receive data (by SMS,
CSD, HSCSD, or GPRS), and make voice calls over the GSM network.
GM-41 modules are not "stand alone" devices; they are used as the engine in an application created by the
customer. A typical application, involves a micro-controller and GM-41 module, in which the micro-controller sends
AT commands to the module via an RS232 communications link.
5.1 Short Message Service
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Sending; MO (mobile-originated) with both PDU (protocol data unit) and text mode supported.
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Receiving; MT (mobile-terminated) with both PDU and text mode supported.
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CBM (cell broadcast message); a service in which a message is sent to all subscribers located in one or
more specific cells in the GSM network (for example, traffic reports).
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SMS STATUS REPORT according to GSM 03.40.
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SMS COMMAND according to GSM 03.40.
The maximum length of an SMS message is 160 characters when using 7-bit encoding. For 8-bit data, the
maximum length is 140 characters. The module supports concatenated messages to extend this function. It is
disabled if CNMI 3,2 is set.
5.2 Voice
Features
•
The GM-41 offers the capability of mobile originated and mobile terminated voice calls, as well as
supporting emergency calls. Multi-party, call waiting and call deflection features are available. Some of
these features are network-operator specific.
•
For the inter-connection of audio, the module offers both single ended and balanced analog input and
output lines. Direct interface to the digital PCM (pulse code modulation) bus used within the module is
available, thus by-passing the internal analog circuitry. The GM-41 has an embedded echo cancellation
and noise suppression for improved audio quality.
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Full Rate, Enhanced Full Rate, and Half Rate (FR/EFR/HR) Vocoder
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Dual Tone Multi Frequency Function (DTMF)
5.3 Data Functionality
The module supports the following data protocols
:
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GPRS (General Packet Radio Service)
Modules are Class B terminals, which provide simultaneous activation and attachment of GPRS and GSM
services. GM-41 modules are GPRS 4+1 enabled devices, which are capable of transmitting in one
timeslot per frame (up link), and receiving at a maximum of four timeslots per frame (down link).
•
CSD (Circuit Switched Data)
GM-41 modules are capable of establishing a CSD communication at 9.6 kbps.
•
HSCSD (High Speed Circuit Switched Data).
GM-41 supports HSCSD communication, with one timeslot per frame capacity in the up link and two
timeslots per frame capacity in the down link (2+1).
