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White Paper T310/T312
24 January 2003
limited to 9,600 bps. For more information, see
“Built-in GSM data modem technical data” on
page 69.
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, inter working with ISDN. This also
provides additional features, such as quick call set-
up capability.
GPRS at high speed
With GPRS data is transmitted in packets. Pricing
of GPRS may be dependent on the data
transmitted, which means very low cost when no
data is sent or received. When transmitting large
amounts of data, it may be possible to increase
bandwidth automatically to allow faster
transmission speed, up to 40,200 bps download
speed.
AT commands support
This section outlines the AT commands supported
by the T310/T312. The information here can be of
use for advanced users, to indicate the possibilities
they have to:
• develop new communications software
• add the T310/T312 to an application’s list of
compatible modems
• adjust the settings of their mobile telephone and
modem
The modem in the T310/T312 supports the V.25ter
command set, which is the standard
communication set used by modems.
The T310/T312 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 in the T310/T312 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 Phone book
• GSM Clock, Date and Alarm Handling