What is data transmission in modes: CSD, GPRS? CSD from MTS: Data Transfer "By Vote How to check for the availability of a CSD service on the phone.

CSD (Circuit Switched Data) - Data transmission technology developed for GSM mobile phones. CSD uses one time interval for data transmission at a speed of 9.6 kbps in a network and switching subsystem (Network and Switching subsystem NSS), where they can be transmitted via the equivalent of a normal modem communication to the telephone network.

At the time of 2006, many GSM operators provide CSD service. Since the maximum data transfer rate for a single time interval is 9.6 kbps, many operators allocate two or more time slots for CSD calls.

Before the appearance of CSD, data transfer in mobile phones was performed by using a modem or built into the phone or attached to it. Due to restrictions on the quality of the audio signal, such systems had the maximum data rate of 2.4 kbps. With the advent of digital data transmission in GSM, CSD provided practical direct access to the digital signal, allowing you to achieve higher speeds. At the same time, using a speech-oriented sound compression in GSM actually means that the data transfer rate using a normal modem connected to the phone will be even lower than in traditional analog systems.

CSD call works very similar to the usual voice call in GSM networks. A single time interval between the telephone and the base station is highlighted. The selected "critting interval" (16 Kbps) is set between the base station and the transcoder, and, finally, another time slot (64 kbps) is highlighted for data transmission between transcoder and switching center: Mobile Switching Center (MSC).

In MSC, it is possible to convert the signal to an analog shape and encoding it using PCM. It is also possible to use a digital signal according to the ISDN standard and transfer it to the remote access server.

How to connect the service and access?

If you do not have a contract for communication with PJSC MegaFon, you need to contact the Corporate Customer Service Center, conclude an agreement and write an application for the connection of the M2M monitoring service. If you are already a corporate client, you can independently connect the service through the "Personal Account" or submit a written application in the form established by the Operator.

How to log in through the API?

• URL: https://m2m.megafon.ru:3333
• Request format: https://m2m.megafon.ru:3333/openapi/v1/tokens-stub/get?login\u003dm2m_xxxxxxxxxx&password\u003dxxxxxxxx

How to enter the service interface?

Follow the link "My Account Services" link at the top of the screen. On the Authorization page, you must enter the login and password received by SMS to the subscriber number of the user's user number, as well as the characters located in the picture. The user has four attempts to enter an incorrect password to access the service interface. After the fifth input of an incorrect password, access on this login is blocked. The user has the ability to get a new password through the service interface, or by contacting the center for working with corporate clients.

How is the subscription fee accrued?

When connecting the M2M monitoring service, all corporate clients are provided with a test period for 7 calendar days during which the subscription fee is not charged.

In the first month, the subscription fee is debited from the personal account of the corporate client on the first day of paid use of the service from the calculation of the number of SIM cards with the connected service in proportion to the number of days remaining until the end of the month. Next, the subscription fee is charged in full in the first number of each month.

What companies do this service are intended for?

"M2M monitoring" will be useful to all companies using SIM cards in devices and equipment. The service can be useful for companies working in the field of motor transport monitoring, banks and trade enterprises, automakers, companies from the field of energy and housing and communal services, fuel and energy companies, as well as companies specializing in security services, security, logistics companies, consumer electronics and manufacturers and system integrators.

Can I independently connect m2m monitoring?

If your company is the corporate client of PJSC MegaFon, then you can independently connect M2M monitoring through your corporate portal's personal account. To do this, you need to connect SIM card numbers with any corporate tariff plan:

1. M2M monitoring to download the desired SIM card on the M2M monitoring service platform and the possibility of controlling it through the service interface;
2. M2M portal User is a setup that allows you to identify the user's user and provide access to SIM card management through the service interface;

• M2M portal Administrator - Setup that allows you to identify the service administrator and provide access to SIM card management through the service interface.

A login and password for accessing the M2M monitoring service interface will come to an SMS message to the employee number to which the "M2M portal user" or "M2M portal administrator" is connected.

What features of the alert has a service?

You can configure alerts to various events, for example, to replace the device in which the SIM card is installed, to achieve data transfer limits, SMS, communication services, etc. You can also adjust sending notifications and configure sending parameters: email address, Phone number for notifications in SMS.

What messages can I send with the help of the service?

You can send messages to selected numbers with the M2M monitoring service connected to determine the activity of the SIM card on the network. You can also send messages to the numbers of mobile operators of the Russian Federation, entered in the "Contacts" section in the services interface.

How to set up a CSD connection on IRZ modems?

Abbreviation CSD.deciphered as Circuit Switched Data. - Transferring data by switching channels in the GSM network. The CSD connection is very similar to the usual voice call, so it is often called data transmission via voice channel.
Below you can read how to organize communication on this technology.

To work on CSD technology, all devices must be preset.

Irz Modems Production Modems You can configure using the IRZ Testmodem program. The remaining modems can be configured through the terminal program. The article will consist of two parts describing both methods.

For the organization of communication, we will need two modem: the presenter from which a set of a telephone number will be carried out, and the slave that will receive an incoming connection.

First of all, check that there is a positive balance on the SIM cards set in the modems.

Make sure the cellular operator has connected the CSD data transfer service on both SIM cards.
Now connect the customizable devices to the computer over the RS232 interface. If there is no such interface, use the interface converter USB-RS232.. For modems with the RS485 or RS422 interface, you need a converter USB-RS485 / 422.
Power supply to modems, wait for modems in the cellular network (the flashing of the LED will be short-term and rare).

Preparation of IRZ modems to work on CSD technology using the Irz Testmodem program.

Download and install the IRZ Testmodem program for your version of the operating system.
Next launch Testmodem. And select your device from the list.

If you know the COM port number, you can specify it in the section " Port Parameters"Otherwise, the program will try to detect the modem independently.

Click the button " To begin". After the status indicator becomes greens, go to the tab" Setting".

In chapter " Mode"Select the speed of the interface. It must correspond to the speed of the equipment that is connected to the modem. As a rule, the standard speed is used. 9600 BPS..
The modem that will dial the phone number, set to " Leading". The modem which will receive incoming connections, set to" Slave". Click" To begin". After setting up the modem, it will be turned off and for further work it will be necessary to restart it by a short-term power off.

Preparation of IRZ modems to work on CSD technology using a terminal program.

Here is a list of AT commands for configuring modems:

Launch Terminal 1.9b.Install parametersport.on the modem, select COM portto which it is connected and click " Connect."

Install the command in the command input field + CR"And enter the first command. Send it in the modem by pressing the button" -\u003e Send.".
Make sure the modem sent a command confirmation - answer " OK"

Sequentially enter the entire AT command set given in the table above. After filing the last team " AT ^ SMSO."The setup will be completed. For further work, you must briefly disable power from the modem.

CSD (eng. Circuit Switched Data) - Data transfer technology developed for GSM mobile phones.
GPRS (English. General Packet Radio Service - "Package Radio Communication") is an add-in over the GSM mobile communication technology that performs packet data transmission.
GPRS allows the user of the cellular network to exchange data with other devices in the GSM network and with external networks, including the Internet. GPRS involves charging in terms of the transmitted / received information, and not the time spent online at CSD.
In CSD mode, the connection to the remote device is installed by its telephone number, because This technology uses data transmission via voice channels.
In GPRS mode, the connection to the remote device is carried out by its IP address. For GPRS, communication channels are distinguished by the residual principle after voice channels, i.e. Voice channels at cellular operators are the most priority than GPRS channels.

IMPORTANT : Not all modem can be configured in such a way that after the power supply the modem is ready to receive a connection in GPRS mode (to connect to the modem, the IP address of the modem and TCP port, "listened" by the modem), is specified.