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In many occasions, radios, airports, military districts, police, campuses, etc. are needed. There are different digital systems, so be careful when you buy them. We are wholesale oem dmr radio exporter, factory supplier and manufacturer, you can buy from us. Now we continue to discuss the important things of dmr radio.
DMR is the abbreviation of Digital Microwave Radio. DMR has the advantages of efficient use of spectrum resources, large-area networking mode, and compatibility with analog routines. Its business functions are rich, scalable, and backward compatible. At the same time, the system and terminal costs are lower, the network construction speed is faster, and the overall operation and maintenance cost is lower.
The DMR specification allows the use of the second time port for reverse network signaling-that is, when the first network remains in a call, calls for in the form of signaling are sent out to the radio on the second opportunity port network. This permits concern call command, push-button control of the sending broadcast or even emergency phone call preemption, and offers precise command as well as adaptability for the driver of the broadcast system. FDMA units can easily certainly not supply similar functions given that they are actually restricted to one road every spectrum network.
DMR electronic modern technology may deliver far better noise suppression and also keep voice premium in a bigger array than analog, specifically at the farthest advantage of the transmission selection. This is actually given that a ton of initiative has been made to select ahead mistake adjustment (FEC) and periodic verboseness inspection (CRC) encoders when building specifications.
By analyzing the bits to detect errors, these encoders receive radio detection and automatically correct transmission errors. The DMR standard specifies more than 14 different encoders, each of which is compatible with different types of traffic. Through the use of encoders and other techniques, digital processing can filter noise and reconstruct the signal from the degraded transmission.
DMR can double the capacity, extend battery life, improve voice quality, and solve problems such as data integration applications. It is a product of market needs and is suitable for governments and large enterprises.
The advantages of DMR communication are very obvious. Take the direct mode as an example. When DMR works with dual time slots, one of the time slots is used for talking, sending short messages and transmitting images, and the other time slot can be used as a control channel. Controls such as monitoring, suspending, remotely killing, and forced insertion of the transmitted business, which are traditional analog walkie-talkies, which cannot be achieved by FDMA communication.
DPMR is FDMA access, with low cost and easy technical realization. The realization of its agreement is divided into pass-through and forwarding.
Both DMR and dPMR standards support direct mode and transit mode. The DMR standard also supports cluster mode. In the direct mode, only one voice call can exist on a channel at the same time. Both standards support functions such as PTT calling, individual calling, group calling, all calling, broadcasting, late access, calling number identification, and call forwarding.
DMR supports OVCM calls (individual calls and group calls can monitor the channel and join the call), unaddressed calls, and feedback on unsupported services (FNS), but does not support slow user data or short additional data.
The DPMR criterion assists slow customer records and also short added data, but performs certainly not assist features like OVCM calls, unaddressed calls, and also reviews on in need of support solutions (FNS). In the pass-through mode, both specifications sustain internet protocol solutions, brief notifications (content, status, precoding).
DMR does not support file transfer and supports the sending of data in a predefined format (Binary, BCD, 7bit characters, 8bit characters, Unicode,), while the DPMR standard supports file transfer, but does not support the sending of data in a predefined format.
Conclusion: Buy them according to our actual needs. But we still need to pay attention to the combination of old equipment and future equipment expansion factors, to choose to use the same standard radio, so as to avoid the use of two standard equipment can not communicate.
