GPRS modem. Leica modems GPS navigation and vehicle monitoring systems based on Garmin navigators and Enfora modems

Transfer of information across boundaries GPRS allows you to easily create systems for remote dispatch and control of devices, as well as stationary and roaming objects. The GPRS modems used for data transmission can be replaced by a widely used CSD connection in GSM (a modem connecting two nodes) with a GPRS connection. This, given the current tariffs of all operators, communication is economically more profitable.

The Insat company offers a wide selection GPRS modems. The greatest popularity for industrial stagnation is to peel off GPRS modem production companies MOXA, ICP DAS, Segnetics, iRZ, ARIES, teleoffices.

Russian manufacturers of GPRS modems

From these manufacturers we feature products from companies such as OWEN, iRZ, Segnetics and teleoffice.

The OWEN company produces a wide range of equipment for industrial automation, dispatch and cloud systems. GPRS modem PM01 from ARIES has proven itself well in a large number of real projects.

The teleoffice company specializes in the development of communication technologies. It offers a wide range of devices, including GPRS and GSM modems.

The iRZ company is an international manufacturer of dart-free products and complex solutions. The uniqueness of the iRZ policy lies in the comprehensive architecture of products and solutions, high-efficiency design new technologies and sensitivity to the dynamics of market development. Model range iRZ features a high range of components, support for new technologies and excellent performance. The company's products do not compromise the characteristics of wired light generators.

The Leica company, with high-precision equipment for geodetic surveys, also produces GIS-class satellite receivers. These are suitable for use in geoinformation systems, navigation, cartography, and other fields, where the first priority is NOT the millimeter accuracy of coordinates, but the flexibility, mobility, the capabilities of software, as well as the simplicity and ease of collecting geospatial data.

Leica satellite receivers for GIS daily tools field observations that allow you to create or update GIS data for any duty or recognition. The main advantage of Leica GIS receivers as satellite receivers of the geodetic class lies in the fact that they have a monoblock form, combining them in one compact housing satellite prime minister, I receive an antenna, radio or Leica steel modem, control controller.

The Leica series of GIS receivers are ideal for you if you are involved in mobile mapping, mapping or communication, and it is important for you to select directly in the coordinate field for your geoinformation system. By always drawing coordinates with submeter accuracy in real time, you will be able to simplify the capture process itself, as there will be no need for further processing in the office. Leica GIS tools are widely used by maintenance technicians, accident response teams, field inspectors and utility companies.

The standard Leica modem is a compact device that looks like a field controller. The front side of the Priora is occupied by a bright and clear touch display, which ensures quick and easy entry and editing of data, and control of the loan process. A powerful processor and a large amount of RAM allow you to work with large amounts of data without any restrictions. Most modern GIS receivers are equipped with digital cameras, built-in speakers and microphones, expansion slots for memory cards and USB connectors.

Droneless Bluetooth and Wi-Fi technologies, which are equipped with current Leica GIS receivers, open up increased capabilities for receiving and transmitting data, allowing you to connect with mobile phones and tablet computers to receive corrections up to real time with real or virtual base station VRS, for importing cards via the Internet. You can also easily connect with a variety of devices, such as laser distance meters, barcode scanners or digital cameras for additional possibilities in the field's minds.

Regardless of those that Leica tools for GIS are primarily intended for autonomous robot With submeter accuracy, you can later turn it into a high-precision geodetic device and determine coordinates with an accuracy of several millimeters. All you need to do is connect a sensitive external antenna, and use your GIS receiver as a primary field receiver for capture with post-processing or in real time. As standard, Leica GIS receivers can be equipped with the ability to receive radio or GSM modem.

Select and buy a Leica modem from Moscow You can in the store or on the RUSGEOKOM website. We also offer delivery to other regions.

Organizing access to the Internet on a PDA or laptop today does not present any particular problems. In principle, a laptop is a basic computer, which, as a rule, carries all standard interfaces (Ethernet, USB) or a basic analog modem for dial-up access via a dial-up telephone line. It will be easier to connect with a modem via USB to a USB-Hub mother or something else. dartless interface(Obviously, devices that organize your access to the Internet may have the same drone-free interface).

It is clear that both the PDA and the laptop are mobile devices, so it would be unreasonable to tangle them with wires to access the Internet. So let's talk about drone-free methods of accessing the Internet from these mobile devices.

There are a number of ways to organize a mobile phone dartless access on the Internet. Among them, the most popular and universal at the moment in Russia is a telephone connection with an additional GSM phone, which allows you to organize fast access to the Internet using GPRS technology (in this case, a gateway in Merezha old phone). However, in this situation, problems sometimes arise with the computer and phone, for which it is necessary to install a wireless connection (USB or RS-232), which is not very easy in other minds, or a wireless connection language (Bluetooth, InfraRed, Wi -Fi), so you don’t have to come again (even if you talk on the phone, you still need to talk).

GSM / GPRS modem with USB interface

The cheapest and most universal solutions for equipping a PDA or laptop mobile Internetє GSM / GPRS modems with USB interface. There are plenty of such devices on sale today.

Some of them are simply GPRS / GPS modems without the ability to use the wireless mode, while others allow you to connect a hands-free headset, which allows you to talk on the phone from a computer.

However, despite their compactness, such models are not very easy to use when stuck on, since they “hover” on a PDA or laptop using an additional cable, require close savings, use and reduce mobility (for example, for USB devices from PDAs are often needed th additional interface of the cradle).

GSM/GPRS PCMCIA cards

If you don’t have to rely on a connection to the Internet from your phone or laptop, you can add a special PCMCIA card that allows you to organize high-speed access to the Global Network and turn your laptop into a full-function mobile telephone with the ability to carry on conversations, as well as send faxes and SMS/MMS messages. Before speaking, please be aware that for connecting to the Internet, your GSM operator and affiliate tariff plan Please support GPRS.

Cards with a PCMCIA interface (PC-card Type II) are not so plentiful on sale today. All of them, as described above, are simply GPRS / GPS modems without the ability to use the wireless mode, otherwise the device is not visible to us in the distance. Even on GPRS-connected services such as Skype and others that allow you to speak, there may be delays in the transmission of language, and even the smallest voice traffic will have to pay for the maximum GPRS rates, which will not be more expensive, alarm bell rings mobile phone, which is located in another place or in another country.

So, more useful, in our opinion, are modems, which have a jack for connecting a headset, which allows you to talk on the phone from a computer, and complex software for emulating all the functions of a telephone device, such as the OvisLink WGP-1500 Billionton PCMCIA GPRS / GSM Wareless modem or Neodrive GPRS-100S (the kit includes a passive headset with a special earphone clip and a sensitive microphone).

Other features of such modems can be seen in the presence of two or three GSM bands (GSM 900, 1800, 1900), manual expansion of the SIM card and the original design of the antenna (this may include a little bit). For example, on the Billionton modem, the antenna design allows it to either be placed in the middle of the device, making it as compact as possible, or hang down, positionally for beautiful yakost I'll accept it. And the Neodrive GPRS-100S modem has a new rotating antenna, although its design looks more reliable than the Billionton modem, whose device is less compact.

To access the Internet, install drivers for the external PCMCIA card and configure connections to the limit However, if you want to quickly access all the functions of your phone, you will need to install a special security program. The virtual keyboard and the functions of its software are usually implemented in a basic “telephone” design and provide simple dialing and answering functionality. Firstly, navigate through the menu of such a phone on to the great screen It’s much easier to use a laptop than to see the icons on the small screen of a smartphone. In addition, such software can add panels with additional functions. With the programs you can install GPRS connection, send SMS, e-mail and fax, as well as keep a notepad, synchronize data with the organizer and save all the same operations on the phone.

To vikoristana such a card in the capacity of the primary mobile phone It is necessary, of course, to connect the included headset (the microphone and speakers of the laptop and devices do not work). After that, you can receive calls or call someone, like from the headset of a telephone. The common compatibility of a PCMCIA card with a phone with a headset means that the system can only be used during an hour of work with a laptop, and if the laptop is connected, it is not possible to quickly access such a phone.

GSM / GPRS CompactFlash cards

However, the PCMCIA interface is only available on laptops, so a PDA cannot be connected to the Internet using other devices. Alternatively, there are more universal solutions based on CompactFlash (CF) or Secure Digital (SD) interfaces, which can be used with both laptops and PDAs.

For example, the Neodrive company has a GPRS-110S model, which is identical in its characteristics to the GPRS-100S model for PCMCIA, and also has a CF interface, which allows you to connect it to a computer with such an interface and convert wow in the communicator.

GSM / GPRS CF-, SD-cards are usually more foldable, and therefore more expensive, lower GPRS-modems based on PCMCIA. This is due to the need to drain the additional battery, which is located on the device. Which battery will require an additional indicator, the ability to supply external power and a plug for charging. To charge the battery in the Neodrive GPRS-110S, you need a special USB adapter, which is connected to the power connector located on the front side of the device, connected to the antenna.

The Neodrive GPRS-110S kit comes with a headset and a sensitive microphone on a special clip.

Devices based on CompactFlash and Security Digital are universal; in order to use them in a laptop, you only need a special adapter for PCMCIA (for the Neodrive GPRS-110S, the CF / PCMCIA adapter is included in the delivery package). To install the GPRS-110S model together with a PDA, the package also includes the Pocket PhoneTools program, which, in its functional capabilities and interface, is similar to the version of PhoneTools for a laptop, so it transforms the PDA of a basic desktop phone (or rather Yes, into the communicator).

Unfortunately, with the presence of such GPRS modems in your phone, it is impossible to connect a wireless phone Bluetooth headset, Please note that the PDA has such an interface. The truth is that GSM telephony of such modems works only with their power headsets and does not interfere with the capabilities of the computer.

It is significant that the price of such devices marketed on the Russian market varies from 100 to 300 dollars.

In the last couple of years, news about the release of more and more new models of devices has become regular, including a special class of hardware - GPRS modems. What is this?
In extremely short terms, GPRS modems can be characterized as another type of device dartless transmission tributes The principle of their importance compared to other devices of this group is that they work on the basis of one of the variants of the technology of packet transmission of information, which is implemented in the measures Stilnikovy bond The GSM standard was given the name General Packet Radio Service, or shortly - GPRS. Mastered technologies are two of the greatest Russian companies Stilnikov's connection - "VimpelCom" and "Mobile TeleSystems" - has already started at 2000, and now the number of Stilnikov's networks in the world that introduced GPRS is already in the hundreds. We tried to establish and supply the organization of international roaming for subscribers who operate in this mode. All the main powers and features of the robot and the parameters of this type of drone-free modems, associated with such a technical solution, become more clear after understanding the essence of the technology itself GPRS. On this topic, our magazine has already written close to the author of fate, and now we can only briefly guess the main essence.

What's next for GPRS creations?
The latest stage in the development of our industrial society has reached the point where for the successful operation of rich daily “information production” it is not necessary for people to be territorially “connected” to any one verst, puppies or introduce this virus complex, and it is even more necessary to just calmly getting to know each other "on the call." The numerical capabilities of telecommunications, and especially mobile phones, often make it possible to accomplish this task. If a person, for example, due to the nature of his work is obliged to take part in the collective sampling of great arrays of data, here the telephone does not need to be buried. Even spending years on dictation or texting on the phone without the presence of numbers in any information or information is not a good job. It is important to call such a robot effective. The other one on the right, according to this data, with just one press on the key, you can quickly transfer any necessary subscriber and simply select the others. In what situation for a successful work life is it no longer important for you to be at all: in the office, at home, in a train compartment, in other places or behind the border...
Zagalom, according to analysts’ estimates, people’s needs in mobile transmission These data, available for inspection in the future, will grow exponentially no less than once again.
Of course, one cannot forget that the possibility of transferring data to the steel ligament was realized right from the very beginning of the work of such measures, but the axis is only possible in practice long time ago appeared to be very theoretical - people didn’t even want to take advantage of it - literally only a few hundred out of the total number of subscribers all over the world! There were two main reasons: affordable and expensive. It is possible, for example, to connect the current telephone connection of a different generation to the GSM standard, which will ensure data transmission with a speed of only 9.6 kbit/s. You can find out how much speed there is “on the clock” by simply guessing what modems are used on basic telephone lines We were completely convinced by such goodies already more than five years ago. The same method of communication via a voice channel with an exorbitant payment has been made by finding information online, if you want, but otherwise it will be expensive.
To eliminate these shortcomings, GPRS technology was invented. This method was intended to significantly increase the speed of data transmission via wireless communication channels, as well as to ensure the “persistent connection” mode for subscribers, in a manner similar to what is implemented in local computing measures. Ale on admin local measures, The work zone here is the entire zone of occupation of the vicorized network, and with roaming regulations - practically all areas of the Earth where there are mobile GSM networks. Such hunting is currently not available, in fact, to any other dartless technologies, except for satellite ones. This is one of the fundamental advantages of GPRS technology.

Technical essence of GPRS
First of all, it is necessary to note that the GPRS technology is oriented towards the use of digital communications to the GSM standard, implemented on the basis of the Time Division Multiple Access (TDMA) method. The very specific features of TDMA are related to its use by GPRS.
To put it simply, the essence of the TDMA method is immediate. The entire hour of operation of one radio channel is divided into standard time intervals, which are distributed through several subscribers. As a result, on one radio frequency it is possible to transmit a number of messages, or organize a number of independent channels for data exchange. The GSM standard has a maximum number of such channels of eight.
Similarly, the instantaneous connection of the channel between the desktop computers allows you to increase the number of subscribers served simultaneously, and all channels are used by busy people in rare moments of peak interest during the period. And right now, some of these channels are in Vilni. The idea of ​​GPRS technology was based on this feature: at times, if the subscriber requires high-speed information transmission, “supply” timely intervals in this radio channel. Thus, the speed of information transfer can increase several times over.
That's not all. The GSM channel itself can provide slightly greater speed of information transmission if you use other coding methods. Without any significant reduction in speed, data transmission speed can be increased to 14.4 kbit/s, and potentially up to 22.8 kbit/s. The communication axis and the high speed of data transmission in GPRS: up to 115 kbit/s, and in between - over 170 kbit/s. Moreover, such high-speed connections allow one of the customers to safely see increased resources at any given time, without risking significantly reducing the chances of other subscribers getting through. It is efficient, in GPRS mode, for example, to print a large electronic sheet the size of an entire typewritten page can be done in just tens of a second. And if you take into account that the GPRS technology contains an hour of blocking the visible radio resources for transmitting a data packet, it is not necessary to exceed 1 second, then the exchange of small amounts of information between correspondents will be possible at the same time. Such profound changes in the minds of exchanging data using mobile terminals open up numerous new possibilities.

Functional capabilities
One of the biggest advantages of the GPRS mode is that the subscriber device “does not take up the line” during pauses between receiving and transmitting data. The network operator’s equipment simply “remembers” that the operator is ready before transmitting or deleting data, and the resources of the radio channel are visible to him only for the hour of information exchange. In other words, any GPRS devices can communicate continuously (as they are, of course, turned on and disconnected within the coverage area) - in the form of a “permanent virtual connection”. With which operator there is no need to require the subscriber to pay every hour of the day mobile border(In fact, it takes 24 years to retrieve), and only during the intervals of active operation of your terminal, both information is transmitted and received.
GPRS technology opens up great possibilities for the development of telemetry transmission systems, remote monitoring, security systems, industrial electronics, etc. GPRS technology is handy for operators of steel fences, as it is modern the implementation of the main GSM measures along the route of their development to sound systems 'The language of the third generation does not require a complete replacement of ownership. However, subscribers, from this point of view, appear in the program - for using GPRS services, special terminals are required that support this technology.

koristuvacha obladnannya
Based on the existing scenarios for GPRS deployment, a step-by-step increase in data transmission speeds has been introduced. Zrobleno tse, zokrema, through the boundaries are superimposed by low subscriber terminals. On the right is that the maximum speed of receiving and transmitting information that a mobile terminal can provide lies in the number of channels (number of time slots) supporting it for receiving and transmitting. While GPRS subscriber terminals are still being released, they offer 2 to 4 channels for receiving information and 1 or 2 channels for transmission. This allows you to remove maximum fluidity reception up to 57.6 kbit / s and transmission - up to 28.8 kbit / s (real speeds, due to the importance of measures and are determined by the actual presence of significant voice traffic time slots, in the process of work can be change accurately and in practice be significantly lower ). In the near future, GPRS terminals will appear, which will support a greater number of channels (up to 7) for reception and transmission and thus ensure a higher speed of communication. According to the functioning algorithm, the standard transfers the basis of GPRS terminals of three different classes:
- class A models are required to ensure the possibility of one-hour operation in telephone mode and in GPRS mode;
- class B terminals also support both voice communications and packet data transmission, but these modes are not implemented simultaneously - while transmitting data via GPRS, the subscriber cannot interact with or receive voice calls, or through the terminal is responsible for promptly responding to input calls and allowing without spend the data to register the session to dial up the telephone call;
- class With orientation to work through modes - GPRS and telephone.
In fact, all currently released mobile phones with GPRS support (and hundreds of models) are up to class B and there are ways for them to connect to a computer via a special cable or infrared port. And one of the most important devices for class C (although not including class A and B) can be GPRS modems that are connected either to the form of a PC card that connects to a laptop computer, or to the form of small-sized GPRS modules, ovanih for use in a wide range of installations - from portable computers to industrial electronics applications.

GPRS modems and modules
The number of actually available models of such devices will reach several dozens and in the very near future, without a doubt, will increase, and their creations today will be occupied by many well-known companies: Ericsson, Motorola, Nokia, Novatel, Option International, , Pretec Electronics, Real Time Devices, Siemens, Sony, Wavecom, Xircom and others, sensed the prospects of this directly.
What are the main advantages of installing the most specialized devices, compared to other popular mobile phones with GPRS support?
They can be called a concept, and primarily, the features of the design design, as well as the functional capabilities and parameters of such modules, which indicate the areas of their most important development. For simplicity of explanation, all these features can be divided into several groups:
- "Wide functional capabilities ". It didn’t just go out - there are a lot of devices of this type available for operation in several decades (or even for everyone!) Frequency ranges that are monitored by daily GSM frequencies (EGSM-850 MHz, GSM-900 MHz, DCS-1800 MHz, PCS - 1900 MHz), which allows such modems to be installed practically all over the world. Also, the versatility of such devices is ensured by the fact that they are often implemented based on data transmission technology. possible in GSM ranges: traditional GSM modem (bandwidth 9, 6 kbit/s), packet transmission in GPRS mode and transmission in line switching mode using HSCSD (High Speed ​​​​Circuit Switched Data) technology, similar to the methods and parameters of GPRS, current GPRS modems usually support. all functions transferred in the development phase to the GSM 2+ standard, including SIM Application Toolkit etc. As a result, the functions of a mobile phone are available: voice calls, receiving and sending faxes, SMS, etc.
-"Everything you need for work and nothing fancy". This is how we can characterize the position in which the optimization of the very structure of these devices is involved. It is true that in addition to phones, GPRS modems are often connected to a number of computer inputs and outputs, which support standard interfaces RS-232, USB and others, as well as connectors for adventure external antennas and other devices. In addition, many modems offer a wide range of capabilities for remote adjustment of parameters and operational software control of their work. On the other hand, modems make it as easy as possible to exclude from their storage such parts that are not included in this type of installation, such as a microphone, speaker, display, keyboard, etc.
- "Perfectness in the most varied minds"- ensure the design of modems and the “inviolability” of some of them up to live voltages. Purely constructively, existing GPRS modems can be divided into three groups. The first of them, which can be called “office”, includes devices designed in the form of Type II PC cards (PCMCIA), oriented towards connecting and working with portable computers. Models intended for installation in other devices can be added to another group, and thus are subject to maximum “lightening” of the design. The third group consists of models for industrial use, which, however, have a “protected” design that will ensure their reliable operation in a wide range of temperatures, humidity, pressure, vibration, electromagnetic fields and other types inflow. Such models often have a wide-range (for example, 5 to 32 V) internal voltage stabilizer, which ensures the possibility of their direct connection to the various components themselves (Li-ion batteries, on-board voltage of the vehicle, no industrial adjustments, etc.). Some models of the remaining two groups will be supplemented with other devices (notably GPS systems, Analog-to-digital conversion, etc.), which further expands their functional capabilities and areas of application.
The use of GPRS modems and modules is particularly promising for the implementation of “machine-to-machine” communication, an area that involves a large number of highly diversified additions: safety features for vehicles and households, words and home automation, telemetric equipment and systems for monitoring parameters and moving various objects, mobile office and much, much more. In other words, GPRS modems may fail in all cases, if laying a cable connection or installing a specialized drone-free system for these and other reasons (organizational, technical, economical) is not possible livable or ineffective. It is also important that you do not need to obtain any special permission to operate GPRS modems. To use this website, just buy it SIM card and then pay for the standard services of the GSM operator.
Please note that GPRS does not depend on other technologies for high-speed data transmission over landline channels (for example, Cellular Digital Packet Data for D-AMPS standards, High Speed ​​Packet Data for systems with a coded signal in for standard cdmaOne etc.), due to the lack of actual light coverage of GSM, is simply “destined” for the next decade (before the widespread expansion of 3G, Wi-Fi, etc.) one of the key technologies of droneless data transmission.
Igor Skolotnev