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TETRAPOL
TETRAPOL (short for TErrestrial TRunked RAdio POLice) is a digital professional mobile radio standard, as defined by the TETRAPOL Publicly Available Specification (PAS), used by professional user groups such as public safety, military, industry and transportation organizations throughout the world. Airbus Defence and Space is the main supplier of this technology. Description TETRAPOL is a fully digital, FDMA, professional mobile radio system for closed user groups, standardizing the whole radio network from data and voice terminal via base stations to switching equipment, including interfaces to the Public switched telephone network and data networks. End-to-end encryption is an integral part of the standard.Tetrapol Publicly Available Specifications(registration required) has detailed information and an overview picture. History Matra/EADS developed TETRAPOL and delivered an operational digital trunked radio system at an early date. Among the first users was the French National ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trunked Radio Systems
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 'cross ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legal Case
Legal proceeding is an activity that seeks to invoke the power of a tribunal in order to enforce a law. Although the term may be defined more broadly or more narrowly as circumstances require, it has been noted that " e term ''legal proceedings'' includes proceedings brought by or at the instigation of a public authority, and an appeal against the decision of a court or tribunal". Legal proceedings are generally characterized by an orderly process in which participants or their representatives are able to present evidence in support of their claims, and to argue in favor of particular interpretations of the law, after which a judge, jury, or other trier of fact makes a determination of the factual and legal issues. * Activities needed to have a court deem legal process to have been provided, such as through service of process. * Conduct of a trial, whether a lawsuit or civil trial, or a criminal trial. * Issuance and enforcement of court orders, including those imposing forecl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecommunications Industry Association
The Telecommunications Industry Association (TIA) is accredited by the American National Standards Institute (ANSI) to develop voluntary, consensus-based industry standards for a wide variety of information and communication technology (Information and communication technologies, ICT) products, and currently represents nearly 400 companies. TIA's Standards and Technology Department operates twelve engineering committees, which develop guidelines for private radio equipment, cellular towers, data terminals, satellites, telephone terminal equipment, accessibility, VoIP devices, structured cabling, data centers, mobile device communications, multimedia multicast, vehicular telematics, healthcare ICT, Machine to machine, machine to machine communications, and smart grid, smart utility networks. Active participants include communications equipment manufacturers, service providers, government agencies, academic institutions, and end-users are engaged in TIA's standards setting proces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Project 25
Project 25 (P25 or APCO-25) is a suite of standards for interoperable Land Mobile Radio (LMR) systems designed primarily for public safety users. The standards allow analog conventional, digital conventional, digital trunked, or mixed-mode systems. P25 was originally developed for public safety users in the United States but has gained acceptance for public safety, security, public service, and some commercial applications worldwide. P25 radios are a replacement for analog UHF (typically FM) radios, adding the ability to transfer data as well as voice for more natural implementations of encryption and text messaging. P25 radios are commonly implemented by dispatch organizations, such as police, fire, ambulance and emergency rescue service, using vehicle-mounted radios combined with repeaters and handheld walkie-talkie use. Starting around 2012, products became available with the newer Phase II modulation protocol. The older protocol known as P25 became P25 Phase I. P25 Phas ... [...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] |
Digital Private Mobile Radio
dPMR or digital private mobile radio, is a Common Air Interface, common air interface for digital mobile communications. dPMR is an open, non-proprietary standard that was developed by the European Telecommunications Standards Institute (ETSI) and published under the reference ETSI TS 102 658. A simplified version of the dPMR protocol intended for licence-free applications was also published by ETSI under the reference TS 102 490. dPMR is very similar to NXDN protocol implementation by Kenwood Corporation, Kenwood and Icom Incorporated, Icom; both now offer dual-standard equipment (July 2013). Specifications *Access method: FDMA *Transmission rate: 4,800 bit/s *Modulation: four-level frequency-shift keying, FSK What is significant is that dPMR achieves all this in a 6.25 kHz channel. Because the emission mask is so tight, two 6.25 kHz dPMR signals can be used next to each other within a 12.5 kHz channel without causing interference to each other or adjacent chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loss Of Chance In English Law
In English law, loss of chance refers to a particular problem of causation, which arises in tort and contract. The law is invited to assess hypothetical outcomes, either affecting the claimant or a third party, where the defendant's breach of contract or of the duty of care for the purposes of negligence deprived the claimant of the opportunity to obtain a benefit and/or avoid a loss. For these purposes, the remedy of damages is normally intended to compensate for the claimant's loss of expectation (alternative rationales include restitution and reliance). The general rule is that while a loss of chance is compensable when the chance was something promised on a contractsee ''Chaplin v Hicks'' (1911) 2 KB 786. it is not generally so in the law of tort, where most cases thus far have been concerned with medical negligence in the public health system. Contract Remedies In contract cases, the court is usually interested in securing the performance of what was agreed. Where one party ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Government Procurement In The United Kingdom
At around £290 billion every year, public sector procurement accounts for around a third of all public expenditure in the UK. EU-based laws continue to apply to government procurement: procurement is governed by the Public Contracts Regulations 2015, Part 3 of the Small Business, Enterprise and Employment Act 2015, and (in Scotland) the Public Contracts (Scotland) Regulations of 2015 and 2016. These regulations implement EU law, which applied in the UK prior to Brexit, and also contain rules known as the "Lord Young Rules" promoting access for small and medium enterprise (SMEs) to public sector contracts, based on Lord Young's Review ''Growing Your Business'', published in 2013.Local Government Association'Lord Young' reforms published on 20 January 2016, archived on 16 March 2017, accessed on 17 January 2025 The Defence and Security Public Contracts Regulations 2011, also derived from EU law, apply to defence procurement. Health commissioners in England are exempt from the Lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Court Of Justice
The High Court of Justice in London, known properly as His Majesty's High Court of Justice in England, together with the Court of Appeal (England and Wales), Court of Appeal and the Crown Court, are the Courts of England and Wales, Senior Courts of England and Wales. Its name is abbreviated as EWHC (England and Wales High Court) for legal citation purposes. The High Court deals at Court of first instance, first instance with all high-value and high-importance Civil law (common law), civil law (non-Criminal law, criminal) cases; it also has a supervisory jurisdiction over all subordinate courts and tribunals, with a few statutory exceptions, though there are debates as to whether these exceptions are effective. The High Court consists of three divisions: the King's Bench Division, the #Chancery Division, Chancery Division and the #Family Division, Family Division. Their jurisdictions overlap in some cases, and cases started in one division may be transferred by court order to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Publicly Available Specification
A Publicly Available Specification or PAS is a standardization document that closely resembles a formal standard in structure and format but which has a different development model. The objective of a Publicly Available Specification is to speed up standardization. PASs are often produced in response to an urgent market need. Background BSI Group develops PASs in the UK, while the International Electrotechnical Commission develops international PASs in the arena of electrical, electronic and related technologies, and the International Organization for Standardization develops international ISO PASs. BSI Group pioneered the PAS format. Under the BSI model, any organization, association or group who wish to document standardized best practice on a specific subject can commission a PAS, subject to the BSI acceptance process. A British Standard and a PAS must reach full consensus between all stakeholders on technical content. The timescale for the development of a PAS can be shorter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ETSI
The European Telecommunications Standards Institute (ETSI) is an independent, not-for-profit, standardization organization operating in the field of Information and communications technology, information and communications. ETSI supports the development and testing of global technical standards for ICT-enabled systems, applications and services. Overview and history ETSI was set up in 1988 by the European Conference of Postal and Telecommunications Administrations (European Conference of Postal and Telecommunications Administrations, CEPT) following a proposal from the European Commission (EC). ETSI is the officially recognized body with a responsibility for the standardization of information and communication technologies (ICT). It is one of the three bodies officially recognized by the European Union as a European Standards Organisation (ESO), the others being European Committee for Standardization, CEN and CENELEC. The role of the ESOs is to support EU regulation and policies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
