Standard, is an eternal topic. This does not, recently, some readers asked about the small friction digital communications standard questions, such as what is included in the mainstream of the Chinese market and international walkie-talkie communications standards and technologies? As another example, communication standards and the advantages of each technology and their applications are good at? ? By discussing with experts, knowledge little friction in this regard were a sort
Standard, is an eternal topic. This does not, recently, some readers asked about the small friction digital communications standard questions, such as what is included in the mainstream of the Chinese market and international walkie-talkie communications standards and technologies? As another example, communication standards and the advantages of each technology and their applications are good at?
Through discussion with experts, knowledge little friction in this regard were a sort: At present, the Chinese handset market is mainly communication standards and techniques can be roughly divided into two categories, one is the mainstream of the international standards in the international market a wide range of applications including : TETRA digital trunking and DMR. While the other is a communication standard with Chinese characteristics of the market, which includes: a digital frequency technology and PDT 12.5KHz digital trunking communication system.
International mainstream digital trunking communication standards:
TETRA digital trunking communication system, it is the ETSI (European Telecommunications Standards Institute) to meet the needs of the professional sector in Europe for mobile communications designed to develop common international standards for open systems, security, reliability, maturity are fully recognized by the industry, most widely used in the international city. ?
At the same time, TETRA (SJ / T1228-2000) is also one of China's digital trunking standard promulgated in 2000. Motorola TETRA standard system is also one of the founders and leaders. With extraordinary speech coding technology, clear voice quality, superior error correction technology, as well as a variety of functions and systems mature and stable, high-precision GPS positioning is widely used in public security departments soldier positioning, TETRA has dispatching tasks successfully applied the Beijing Olympics and Shanghai World Expo. In addition, many domestic subway lines, major airports and major port, and oil mining and other fields, is also widely deployed TETRA system.
International mainstream digital communications standards:
In order to meet the different needs of industry users of mobile communications, in April 2005 the European Telecommunications Standards Institute has developed the international standard DMR digital communications. Its purpose is to build a less complex, more cost-effective digital communication system. DMR uses 12.5KHz channel spacing, two-slot TDMA technology, has a high spectral efficiency, DMR provides voice, data and other ancillary services, with the various functions required by the user, the maximum to meet the various needs of industry users, so It has become the world's most widely used within the range, the largest user of proven digital radio technology standards.
As a key member of the alliance DMR Motorola is committed to innovation under the standard product, to provide an open interface program to encourage consumers according to their own business development easy secondary development to meet business needs. While its MOTOTRBO series products have been successfully brought promptly communicate critical moment for the user forestry, petroleum, petrochemical, transportation logistics, large hotels, security and other applications.
Digital communication technology with Chinese characteristics:
12.5KHz digital divide to promote digital radio technology is a rapidly growing popularity of the application of technology. Collection of technical difficulty, cost of production and marketing in order to promote other advantages in one, has become the new darling of today's "rotation model" under the trend, and the majority of walkie-talkie equipment manufacturers to provide new business opportunities. The technology is suitable for leisure travel, resorts, hotels, restaurants, community streets, campus security, utilities and other industries.
China Digital Communication Standard Features:
Since the public security field of application specificity and diversity, public security field the user can select the standard format and solutions according to their needs. Wherein PDT (PoliceDigital Trunking) Police use digital trunking communication system standard is developed by the Ministry of Public Security departments in charge of leadership. The standard formally promulgated in 2013 and to meet the public security system, wireless communication professional user groups dispatching needs. As the owner of the relevant basic patents, Motorola PDT system is also a member of the alliance.