4.FEATURES

4.1WIRELESS DATA BEARERS

The Nokia 30 GSM Connectivity Terminal supports five bearers for wireless data transfer, which can be used where GSM networks support them.

•General Packet Radio Service (GPRS)

•High speed circuit switched data (HSCSD)

•Circuit switched data (CSD)

•Short messages (SMS)

•Unstructured Supplementary Service Data (USSD)

General Packet Switched Service (GPRS) utilises packet switched technology where information is transmitted in small bursts of data. The GPRS mobile station class of the Nokia 30 is class B. This means that both GPRS connections and circuit switched connections are possible, although it has to be defined which one is used each time. The Nokia 30 supports GPRS multi-slot class 6, thus multiple timeslots can be used for data transfer at the same time: 3 + 1, 2 + 2 or 2 + 1 slots.

With High Speed Circuit Switched Data (HSCSD), the Nokia 30 is a multi-slot class 6 terminal and offers data transfer speeds of up to 43.2kbit/s when 3+1 timeslots are in use.

Circuit switched data offers data speeds of up to 14.4kbit/s.

The Short Message Service allows the user to send and receive messages of up to 160 characters via the Nokia 30. The service can deliver messages to the Nokia 30 whenever it is connected to the network, even when the terminal is engaged on an active call. SMS is a convenient way of passing data quickly and easily to and from Nokia 30 terminals. The Nokia 30 also supports unicode SMS messages for graphical character sending.

Unstructured Supplementary Services Data (USSD) offers reliable interactive messaging services. USSD allows the user to send and receive messages of up to 182 characters via the Nokia 30. When USSD is used, a session is established for the duration of the connection. This increases data transfer reliability, as the delay is known. In addition, it shortens response times.

With the Nokia 30, it is possible to choose which bearer is used in the application. With a wireless bearer choice, communication costs can be optimised. When new technologies and bearers are introduced, the onward compatibility of the Nokia 30 offers the possibility of choosing from more bearers.

4.2SERVER CONTROLLED I/O

A control similar to the one described in chapter 3.3 is also possible in the M2M System mode. In this case, the control of the device is performed from the Internet browser that utilises the services of the Nokia 30 as part of the Nokia M2M Platform.

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