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White Paper T610/612
28
GPRS enables constant connection and high
speed
With GPRS, the connection is maintained “constantly”,
and data is transmitted in packets. Pricing 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
85,600 bps download speed.
AT commands support
This section outlines the AT commands supported by the
T610/612. The information here can be of use for
advanced users, to indicate the possibilities they have to:
• develop new communications software
• add the T610/ 612 to an application’s list of compati-
ble modems
• adjust the settings of their mobile telephone and
modem
The modem in the T610/612 supports the V.25ter
command set, which is the standard communication set
used by modems.
The T610/612 is compatible with industry de facto
extensions, ETSI 07.05, 07.07 and 07.10.
Overview of AT command functions
AT commands are used to configure the mobile
telephone, to request information about the current
configuration or operational status of the mobile phone,
and to test availability and request the range of valid
parameters, when applicable, for an AT command.
The built-in modem can be set to any one of three modes
of operation. These are:
Off-line command mode
The command mode for entry of AT commands, when
the device is first turned on.
On-line data mode
Allows “normal” operation of the built-in modem, for
exchanging data or facsimiles with a remote modem.
On-line command mode
For sending AT commands to the built-in modem while
remaining connected to a remote modem.
The AT commands are grouped as follows:
• Control and Identification
• Call Control
• Interface Commands
• Data Compression
• Mode Management
• Audio Control
• Accessory Menus
• Accessory Authentication
• Voice Call Control
• Accessory Identification
• GSM DTE-DCE Interface Commands
• GSM Call Control
•GSM Data
• GSM High Speed Circuit Switched Data
• GSM Network Services
• GSM USSD
• GSM Facility Lock
• GSM Mobile Equipment, Control and Status
• GSM Mobile Equipment Error Control
• GSM SMS and PDU Mode
•GSM GPRS
• GSM Phonebook
• GSM Clock, Date and Alarm Handling
• GSM Subscriber Identification
• Ericsson Specific AT Commands for GSM
• MMI Settings
• Voice Control
•OBEX
• WAP Browser