Sony Ericsson GM48, GM47 manual Short Message Service

GM47/GM48 INTEGRATOR’S MANUAL

2.3.2 Short Message Service

The module supports the following SMS services:

•Sending; MO (mobile-originated) with both PDU (protocol data unit) and text mode supported.

•Receiving; MT (mobile-terminated) with both PDU and text mode supported.

•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).

•SMS STATUS REPORT according to GSM 03.40.

•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 (See “AT+CNMI New Message Indications to TE”, page 264).

2.3.3 Voice Calls

The GM47 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 analogue 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 analogue circuitry.

2.3.4 Data

The module supports the following data protocols:

•GPRS (General Packet Radio Service)

Modules are Class B terminals, which provide simultaneous activation and attachment of GPRS and GSM services. GM47 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)

GM47 modules are capable of establishing a CSD communication at 9.6kbps.

•HSCSD (High Speed Circuit Switched Data).

GM47 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).

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