2.3.2 Short Message Service

The wireless modem 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 3GPP TS 23.40

The maximum length of a text mode SMS message is 160 characters using 7-bit encoding. The wireless modem supports up to six concatenated messages to extend this function. Concatenation is performed by the host application.

2.3.3 Voice Calls

The wireless modem offers the capability of MO (mobile originated) and MT (mobile terminated) voice calls, as well as supporting emergency calls. Multi-party, call waiting and call divert features are available. Some of these features are network- operator specific.

For the inter-connection of audio, the wireless modem offers both single ended and balanced analogue input and output lines. Direct interface to the digital PCM (pulse code modulation) bus used within the wireless modem is available, thus by-passing the internal analogue circuitry. The wireless modems support HR, FR, EFR and AMR vocoders.

2.3.4 Data

The wireless modem supports the following data protocols:

•GPRS (General Packet Radio Service)

The wireless modem is a Class B terminal. The wireless modem is GPRS multislot class10 enabled, capable of receiving at a maximum of four timeslots per frame (down link), and transmitting in two timeslots per frame (up link). See section 2.3.5 for multi-slot allocation by class.

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