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PDT Standard
PDT (short for ''Professional Digital Trunking'' or ''Police Digital Trunking'') is an open industry standard for trunked radio system in China servicing police wireless communications and professional mobile radio. The standard is being maintained by the ''Professional Digital Trunking System Industry Association'', an association of major vendors of wireless communications equipment in China. The association was formed with the help from Information and Communications Bureau of the Ministry of Public Security. The standard was used to facilitate the digital transformation of the Ministry's existing MPT analogue trunking system. Government policy supporting this domestic standard had led to the abolishment of previous GA/T industry standards based on the European TETRA standard. The initial major contributor of the standard were Hytera Communications and Vigor Communications(WANGE). Vigor was also the first enterprise to produce PDT two-way radio products. Features PDT features ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trunked Radio System
A Trunked Radio System (TRS) is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a ''talkgroup'') with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time talking. These systems typically have access to multiple channels, up to 40-60, so multiple groups in the same area can communicate simultaneously. In a conventional (non-trunked) system, channel selection is done manually; before use, the group must decide which channel to use, and manually switch all the radios to that channel. This is an inefficient use of scarce radio channel resources because the user group must have exclusive use of their channel regardless of how much or how little they are transmitting. There is also nothing to prevent multiple groups in the same area from choosing the same channel, causing conflicts and 'c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Police Radio
Police radio is a radio system used by police and other law enforcement agencies to communicate with one another. Police radio systems almost always use two-way radio systems to allow for communications between police officers and dispatchers. Most modern police radio systems are encrypted, and many jurisdictions have made listening to police radio frequencies as a private citizen illegal. History Before police radio systems were first implemented, police officers assigned to their beat could only communicate with police command using telephone booths, call boxes, police boxes, or physical meetings. Calling for help or signaling other officers could only be done by shouting, using a whistle, or hitting things to make sounds. This meant that properly calling for assistance, reporting an incident or arrest, being dispatched to handle a crime, or requesting police resources was only possible if the officer reached a telephone or call box. The first police radio systems we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ministry Of Public Security Of The People's Republic Of China
Ministry may refer to: Government * Ministry (collective executive), the complete body of government ministers under the leadership of a prime minister * Ministry (government department), a department of a government Religion * Christian ministry, activity by Christians to spread or express their faith ** Minister (Christianity), clergy authorized by a church or religious organization to perform teaching or rituals ** Ordination, the process by which individuals become clergy * Ministry of Jesus, activities described in the Christian gospels * ''Ministry'' (magazine), a magazine for pastors published by the Seventh-day Adventist Church Music * Ministry (band), an American industrial metal band * Ministry of Sound, a London nightclub and record label Fiction * Ministry of Magic, governing body in the ''Harry Potter'' series * Ministry of Darkness, a professional wrestling stable led by The Undertaker See also * Minister (other) * Department (other) D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Transformation
Digital transformation (DT) is the process of adoption and implementation of digital technology by an organization in order to create new or modify existing products, services and operations by the means of translating business processes into a digital format. The goal for its implementation is to increase value through innovation, invention, improved customer experience and efficiency. Focusing on efficiency and costs, the Chartered Institute of Procurement & Supply (CIPS) defines "digitalisation" as However, since there are no comprehensive data sets on digital transformation at the macro level, the overall effect of digital transformation is still (), too early to comment. While there are approaches which see digital transformation as an opportunity to be seized quickly if the dangers of delay are to be avoided, a useful incremental approach to transformation called discovery-driven planning (DDP) has been proven to help solve digital challenges, especially for traditional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terrestrial Trunked Radio
Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological families Characidae, Alestidae (the "African tetras"), Lepidarchidae, Lebiasinidae, Acestrorhynchidae, Stevardiidae, and Acestrorhamphidae. In the past, all of these families were placed in the Characidae. The Characidae and their allies are distinguished from other fish by the presence of a small adipose fin between the dorsal and caudal fins. Many of these, such as the neon tetra (''Paracheirodon innesi''), are brightly colored and easy to keep in captivity. Consequently, they are extremely popular for home aquaria. ''Tetra'' is no longer a taxonomic, phylogenetic term. It is short for '' Tetragonopterus'', a genus name formerly applied to many of these fish, which is Greek for "square-finned" (literally, four-sided-wing). Because of the popularity of tetras in the fishkeeping hobby A hobby is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hytera Communications
Hytera (; previously HYT; ) is a Chinese publicly traded and partly State-owned enterprise, state-owned manufacturer of radio transceivers and radio systems founded in Shenzhen, Guangdong in 1993. Hytera is listed on the Shenzhen Stock Exchange and is partly owned by Shenzhen Investment Holdings of Politics of Shenzhen, Shenzhen's municipal government. Hytera is major contributor to the PDT Standard, which is designed for public safety organizations in China. The company is a major supplier to China's Ministry of Public Security (China), Ministry of Public Security. History The company's head office is in Shenzhen, China. Hytera's products are developed at three development sites in total. One of the development sites is located in Bad Münder, Germany. In March 2012 Hytera acquired the German company Rohde & Schwarz Professional Mobile Radio GmbH from the German electronics group Rohde & Schwarz, which is now known as Hytera Mobilfunk. In addition, there are Hytera subsidiaries i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Protocol
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. IP has the task of delivering Packet (information technology), packets from the source Host (network), host to the destination host solely based on the IP addresses in the packet Header (computing), headers. For this purpose, IP defines packet structures that encapsulation (networking), encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information. IP was the connectionless datagram service in the original ''Transmission Control Program'' introduced by Vint Cerf and Bob Kahn in 1974, which was complemented by a connection-oriented service that became the basis for the Transmission Control Protocol (TCP). The Internet protocol suite is therefore often referre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SNMP
Simple Network Management Protocol (SNMP) is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks and for modifying that information to change device behavior. Devices that typically support SNMP include cable modems, routers, network switches, servers, workstations, printers, and more. SNMP is widely used in network management for network monitoring. SNMP exposes management data in the form of variables on the managed systems organized in a management information base (MIB), which describes the system status and configuration. These variables can then be remotely queried (and, in some circumstances, manipulated) by managing applications. Three significant versions of SNMP have been developed and deployed. SNMPv1 is the original version of the protocol. More recent versions, SNMPv2c and SNMPv3, feature improvements in performance, flexibility and security. SNMP is a component of the Internet Protocol Suite as define ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Mobile Radio
Digital Mobile Radio (DMR) is a digital radio Technical standard, standard for voice and data transmission in non-public Radio network, radio networks. It was created by the European Telecommunications Standards Institute (ETSI), and is designed to be low-cost and easy to use. DMR, along with Project 25#Phase 2, P25 phase II and NXDN are the main competitor technologies in achieving 6.25 kHz equivalent bandwidth using the proprietary Multi-Band Excitation, AMBE+2 vocoder. DMR and P25 II both use two-slot Time division multiple access, TDMA in a 12.5 kHz channel, while NXDN uses discrete 6.25 kHz channels using frequency division and TETRA uses a four-slot TDMA in a 25 kHz channel. DMR was designed with three tiers. DMR tiers I (Unlicensed) and II (Conventional Licensed) were first published in 2005, and DMR III (Trunked version) was published in 2012, with manufacturers producing products within a few years of each publication. The primary goal of the standard is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Law Enforcement In China
Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the art of justice. State-enforced laws can be made by a legislature, resulting in statutes; by the executive through decrees and regulations; or by judges' decisions, which form precedent in common law jurisdictions. An autocrat may exercise those functions within their realm. The creation of laws themselves may be influenced by a constitution, written or tacit, and the rights encoded therein. The law shapes politics, economics, history and society in various ways and also serves as a mediator of relations between people. Legal systems vary between jurisdictions, with their differences analysed in comparative law. In civil law jurisdictions, a legislature or other central body codifies and consolidates the law. In common law systems, judges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standards Of The People's Republic Of China
Standard may refer to: Symbols * Colours, standards and guidons, kinds of military signs * Standard (emblem), a type of a large symbol or emblem used for identification Norms, conventions or requirements * Standard (metrology), an object that bears a defined relationship to a unit of measure used for calibration of measuring devices * Standard (timber unit), an obsolete measure of timber used in trade * Breed standard (also called bench standard), in animal fancy and animal husbandry * BioCompute Standard, a standard for next generation sequencing * ''De facto'' standard, product or system with market dominance * Gold standard, a monetary system based on gold; also used metaphorically for the best of several options, against which the others are measured * Internet Standard, a specification ratified as an open standard by the Internet Engineering Task Force * Learning standards, standards applied to education content * Standard displacement, a naval term describing the wei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
