AT Command Set

6.3.1 ATD *98# Request GPRS IP service

Execute command

ATD*98[*<cid>]#

This command causes the MT to perform whatever actions are necessary to establish a communication between the TE and the external PDN.

The V.25ter 'D' (Dial) command causes the MT to enter the V.25ter online data state and, with the TE, to start the layer 2 protocol.

GPRS attachment and PDP context activation procedures may take place prior to or during the PDP startup if they have not already been performed using the +CGATT (see Chapter 6.1.1) and +CGACT (see Chapter 6.1.2) commands. If the context to be used is already activated, it will be deactivated first. This en- sures that the right context parameters will be used (e.g. QoS changes since the last context activation).

Note: An example of how to use this command can be seen in chapter 6.5

Response

To confirm acceptance of the command to entering the V.25ter online data state:

CONNECT

When the layer 2 protocol has terminated, either as a result of an orderly shut down of the PDP or an error, the MT enters V.25ter command state and return

NO CARRIER

Parameter

<cid>: numeric parameter which specifies a particular PDP context definition (see +CGDCONT command). If no context is specified, an internal context 0 with default QoS (network subscribed) and APN from EEPROM (if there is one) is used.

1

2

Note: The +CGDCONT, +CGQREQ, etc. commands may be used prior to set values for cid, PDP type, APN, QoS etc..

Reference

Note:

GSM 07.07

ATD is used as a standard V.25ter AT-Command, too.

 

 

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MC35 specifications

The Siemens MC35 is a compact and versatile modem designed primarily for mobile communication, data transmission, and machine-to-machine (M2M) applications. Launched in the early 2000s, it quickly became popular due to its blend of performance, reliability, and ease of integration, making it a solid choice for developers and businesses.

One of the key features of the MC35 is its support for GSM and GPRS technologies. This allows it to connect seamlessly to various networks, enabling users to transmit data at speeds that were impressive for its time. The GPRS capability can offer data rates of up to 171.2 kbps, allowing for efficient data transfer even in areas with limited connectivity.

The MC35 is designed to support both SMS and voice functionalities, making it adaptable for a range of applications. This includes remote monitoring, telemetry, and alarm signaling. The ability to send and receive SMS messages is a significant advantage for applications that require immediate alerts and notifications, enhancing its utility in security systems and industrial automation.

Furthermore, the modem is equipped with a range of interfaces, including serial communication (RS232), which makes it compatible with various hardware devices. This facilitates easy integration into existing systems, whether for industrial machinery or consumer electronics. Additionally, it features a robust software development kit (SDK), which enables developers to create custom applications tailored to their specific requirements.

Power consumption is another notable characteristic of the Siemens MC35. It is engineered to be energy-efficient, which is especially important for battery-operated devices or systems that require a prolonged operation without frequent recharging or maintenance.

In terms of physical characteristics, the MC35 is compact and lightweight, allowing it to fit into various enclosure designs without occupying much space. Its durability ensures it can perform reliably in different environments, making it suitable for outdoor and industrial applications.

To summarize, the Siemens MC35 stands out as a reliable modem with a rich feature set that includes GSM and GPRS support, SMS and voice capabilities, easy integration through various interface options, and energy-efficient operation. Its adaptability makes it a valuable tool for a wide array of communication and data transmission tasks, solidifying its place in the evolution of mobile communications technology.
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