SINGLE SITE CONVENTIONAL

The development of modern conventional radio stations and communications controllers has made it possible to bring the service capabilities of the usual equipment to the trunking capabilities closer, allowing the creation of small systems with enhanced capabilities. Thus, in spite of the rapid development of trunking systems around the world, conventional communication remains a fiscal decision and continues to evolve.

In fact, any conventional radio system is based on the use of repeaters (repeaters). This requires the presence of two frequencies (duplex pair), which are received in the UDCP SE in accordance with the current legislation. The first reason for using a repeater is the ability to significantly increase the range of radio communication. Linking two radio stations without a repeater is at best possible at a distance of only a few kilometers, while the repeater allows you to increase the range to tens of kilometers. When using the MotoTRBO equipment, there is always the possibility of flexible scaling and increase of the capacity of the existing radio communication system.

Main benefits of MotoTRBO equipment DMR standard:

1. Increased efficiency of frequency resource use

For many users of two-way radio systems, the greatest advantage of digital standards is that they allow more efficient use of the resource of existing licensed channels. Ether is becoming more and more loaded, and former licensed channel structures, originally designed to service a small number of users, are no longer able to cope with increasing traffic. To increase the efficiency of frequency resource use, the DMR protocol (ETSI) uses the method of dividing a channel in the width of 12.5 kHz into two timelosses using TDMA technology. This allows you to save the operating characteristics of the bandwidth of 12.5 kHz and at the same time makes it possible, in a universal way, depending on the current needs, to connect a significantly larger number of subscribers with existing licensed channels in the organization. For example, two intervals in one channel can be used to transfer two separate calls. You can also select one of the call intervals, and in the second one, you can transfer data or priority traffic simultaneously.

2. Longer battery life

One of the main characteristics of mobile terminals has always been the battery life between charging. Previously, there were only two ways to increase the device's operating time on a single battery charge. The first is to increase the capacity of the battery. Manufacturers of batteries have already done a lot to increase the capacity of their products, but further improvement of the characteristics at this time is possible only by increasing the size, and hence at the expense of portability. Another way is to reduce the power of the transmitter, part of the portable terminal, with the highest power consumption. However, this will result in a narrowing of its zone of operation and the potential for interference from other devices, which is an unacceptable compromise for the professional system.

The DMR ETSI standard offers another, rather effective option. Since one call only takes one of the two TDMA timeslots, it only needs half the power of the transmitter. Half of the time in the unused TDMA time slot is in the standby mode. With typical workload "5% reception, 5% transfer, 90% wait" 80% of battery charge is spent during transmission. The two-month TDMA protocol reduces the real time of the transmitter by half, thereby saving up to 40% battery charge, which helps to increase battery life in talk mode. As a result, the overall battery consumption during calls is greatly reduced, which allows for longer use of the terminal from one charge. In addition, the ETSI DMR provides power management and standby power management technologies that further enhance battery life.

3. Improved speech quality, extended area of operation

Users of professional two-way radio systems require a clear, continuous and reliable voice communication. Missed call, operator error, twisted message or landed battery can lead to reduced productivity, waste of time and money. Because of the physical characteristics of the radio, analog systems can suffer from a number of factors limiting the range of their actions and the clarity of speech transmission. Any failure or distortion of the analog signal caused by external factors directly affects the quality of the language reproduced by the receiver. The weakened signal can be amplified and retransmitted, but the quality of the language can not be restored. The result of such a deterioration of the signal - an increase in noise and transmission defects, through which the signal becomes more indecisive, the closer the subscriber approaches the boundary of the real range of the terminal.

The DMR ETSI systems use error correction tools that allow you to reproduce the language in virtually the original quality, regardless of which part of the network coverage area is the subscriber. Although the digital radio signal of the DMR system is subject to the same physical effects as the signal of the analog system, when the signal strength of the signal is deteriorated, digital traffic can reach the recipient intact, even if the signal strength falls within the exponent.

The DMR standard digital receivers simply reject all data that they consider to be false. Although the "dirty" signal may cause defects in the sound reproduced by the digital receiver, for example, to a short spill of sound or a burst of "mechanical" noise, however, it will never lead to permanent interference that is possible in analog systems when working in complex conditions. If the DMR receiver can "understand" the digital speech signal, then it can decode it and clearly reproduce the language. Moreover, the Digital Mobile Radio standard decoder includes a system for suppressing background noise at the transmitter level. Therefore, no third-party noise is transmitted and the receiving party does not hear it.

Conventional system MotoTRBO allows you to implement the following functions in digital mode:

- General call (connection to all subscribers within the same repeater)
- Group call
- Individual challenge
- Text messages
- Emergency call (possibility to engage in any logical communication channel for the purpose of urgent notification of the subscriber or group)
- Radio kill (the ability to kill a radio station, that is, to shut it off remotely from a communications system, which is convenient, for example, in the case of its theft or interception by attackers)
- Radio check (possibility to remotely check the presence of a radio station in the system)
- AVL (Automatic Vehicle Location - GPS position monitoring station)
- Telemetry (remote measurement and data collection for operator or user)
- Encoding voice and data on basic (16 bit) or upgraded levels (40 bit)