Modem and AT commands, GSM data communication

for example:

•Constant connection

•Keep an open connection to an e-mail system or the company network, staying online to receive and send messages at all times. All connection settings can be managed by using the data connections feature.

•High speed

•Gain access automatically to increased bandwidth when downloading large files, images etc.

•Cost efficient

•Use transmission capacity only when needed, thus reducing costs.

•WAP over GPRS

•Access the Internet via WAP at high speed and with a constant connection.

•E-mail over GPRS

•Remain connected to an e-mail system while reading and preparing messages, (which are sent at a high speed).

•Data communication

•Transfer data and access the Internet or an intranet with a PC, PDA or handheld device connected via Bluetooth wireless technology, infrared or cable.

White Paper T610/612

•Data and voice

•Maintain a data connection, for example, a constant connection to an e-mail system when conducting a voice call.

•Provide settings

•Receive GPRS configuration settings from the pro- vider over the air, OTA, making manual configura- tion unnecessary.

•User controlled settings

•Take advantage of full user control in the data con- nections menu, establishing multiple descriptions and accessing advanced settings for GPRS.

Interruption of GPRS data account

When the user is browsing with a T610/612 the GPRS connection will be automatically disconnected when an incoming call is received. This is the default behaviour. However, it is possible for operators to customize the phone in such a way as to ensure that the user is asked if they wish to remain connected when an incoming call is received.

Modem and AT commands

The T610/612 contains a complete GSM/GPRS modem. This provides data and e-mail communication, as well as Internet/intranet access, for a connected PC, PDA or handheld device. Once the PC/PDA is connected to the phone using a cable, Bluetooth wireless technology or infrared, and the appropriate software is installed, the modem in the phone works in a similar way to a PC Card modem, or an external modem.

In the T610/612, AT commands are used for:

•controlling the data communication between the PC and the remote service

•configuring and requesting settings and behaviours in the phone, from a connected PC or PDA

GSM data communication

The built-in data capability turns the phone into a modem when connected to a PC/PDA. The T610/612 offers the user data connection anytime, anywhere, unmatched by fixed telephone networks. Each GSM channel is divided into eight repeating time slots. A normal GSM voice or data call is circuit switched, and only one time slot is used for each call. The data speed is therefore limited to 9,600 bps.

High Speed Data gives a faster speed

High Speed Data (HSCSD) increases speeds for circuit switched data by allowing the phone to use a coding scheme with a high capacity, and to use two time slots for receiving data. The download speed is increased to up to 28,800 bps. The speed for sending data is limited to 14,400 bps. The data rate can be increased several times by the use of rate adaption, interworking with ISDN. This also provides additional features, such as quick call set-up capability.