Ericsson T39 Modem and AT Commands, GSM Data Communication, High Speed Data Gives a Faster Speed

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MODEM AND AT COMMANDS

The T39 contains a complete GSM 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 Bluetooth wireless technology, infrared or a cable, 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 T39, AT commands are used both 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 T39 offers the user data connection anytime, anywhere, unmatched by fixed telephone net- works. Each GSM channel is divided into eight repeating time slots.

A normal GSM call only uses one of eight repeating time slots in the GSM channel, giving a data speed of 9,600 bps. The T39 supports a more efficient coding scheme, giving data speeds of up to 14,400 bps (providing the network supports this).

9,600/14,400

9,600/14,400

9,600/14,400

9,600/13,200

9,600/13,200

9,600/13,200

9,600/13,200

1

GSM 9,600 bps

14,400, 19,200 or 28,800 bps (HSCSD)

2

GPRS

9,600, 13,200, 19,200, 26,400, 28,800 or 39,600 bps

High Speed Data Gives A Faster Speed

High Speed Circuit Switched Data (HSCSD) gives the possibility to use two time slots for receiving data. In combination with a more efficient coding scheme, this can increase the receiving data speed up to 28,800 bps (network-dependent). Additionally, by using Data Com- pression (V 42bis) the experienced data rate can be increased up to four times.

GPRS Enables Constant Connection And High Speed

With GPRS, the connection is maintained “constantly”, and data is transmitted in packets. Pric- ing of GPRS can be dependent on the actual use of bandwidth, which means very low cost when no data is sent or received, while the phone remains connected. When transmitting large amounts of data, bandwidth can be increased automatically to allow faster transmission speed, up to 39,600 bps download speed.

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Contents Mobile Phone T39 White Paper Page Contents Appendix Technical Specifications Preface Purpose Of This DocumentProduct Overview T39 Powerfully Attractive And Always OnlineBluetooth wireless technology SynchronizationFunctions And Features For Productivity Bluetoothtm Wireless Technology BluetoothUsing Bluetooth Wireless Technology In The T39 General Packet Radio Services GprsUsing Gprs In The T39 WAP Services Using WAP In The T39Company network for their users GSM Data Access Bearer Type CharacteristicsGprs Access SMS AccessCertificates Security Using WAPWIM Locks PIN Codes Push Services Over-The-Air Provisioning Of WAP SettingsConfiguration Of WAP Settings Service Indication SIService Loading SL Powerful Messaging Enhanced Messaging Service EMSSounds And Melodies Pictures And AnimationsPicture Editor Data Connections Mobile Internet and E-MAILBuilt-in E-mail Client Mobile Positioning GSM Data Communication Modem and AT CommandsGprs Enables Constant Connection And High Speed High Speed Data Gives a Faster SpeedOverview Of AT Command Functions AT Commands SupportGSM Ussd GSM Gprs ObexSynchronize Calendar and Phone Book Synchronize With Local Calendar And Phone BookHierarchical Phone Book With Contacts Synchronize Over WAP Using SyncMLSynchronization Software And The T39 XTNDConnect PC For Ericsson XTNDConnect PCAirCalendar For Mobile People Connection Via Infrared Infrared TransceiverConnection Via Cable Downloadable Background Pictures Functions and FeaturesIn-phone Functions And Features ProfilesHierarchical Phone Book Voice ControlMagic Word Voice MemoRing Signal Exchange More In-phone Functions And FeaturesBusiness Card Exchange Network-Dependent FeaturesMore Network-dependent Features Fixed Dialling And Restricted CallsVoice mail WAP Service Mode Support T39 SIM AT Services Supported By The T39SIM Application Toolkit Polling OFF GET InputMore Time Poll IntervalSend Ussd SET UP CallSET UP Menu SMS PP DownloadUser Interaction With SIM AT Send Short MessPage Terminology and Abbreviations GSM GIFGprs HdmlTCP/IP PIMSIR TLSWDP WbmpWbxml WIMSoftware Related InformationDocuments Links Trademarks And AcknowledgementsGeneral Appendix Technical SpecificationsAmbient Temperatures Exterior DescriptionTdma Performance And Technical CharacteristicsDimension GSM 900/E-GSM GmskCurrent Consumptions, Talk And Standby Times Dimension Value in GSMDimension Full rate Enhanced full rate Speech CodingBluetooth Wireless Technology Technical Data Dimension Support in the T39Feature Support in the T39 WAP browser WAP Browser Technical DataWAP/WML Feature Support in the T39 WAP browser Dimension Support in T39 Gprs Technical DataSIM Infrared Transceiver Technical Data Built-in GSM Data Modem Technical DataDimension Support in the T39 Signal in RS-232 Support in DRS-10 Connection Via CableEnhanced Messaging Service Technical Data EMS Feature Support in T39My Pictures Page Index