The D-Book is the UK technical specification for digital terrestrial television (DTT).
28-570: The Digital TV Group (DTG) has published and maintained the D-Book for over a decade and the specification is updated annually to keep up with the pace of development in UK DTT. The D-Book is compiled by DTG Working Groups composed of industry experts from the DTG’s staff and membership of around 150 broadcasters, manufacturers, technology providers and other organisations who continually update and peer-review
56-649: A Trade Mark License in the UK, the SD receiver and recorder profiles have been removed and the chapter describing SCART and HDMI connectivity have been removed. Additionally, in the RF chapters (9 and 10), 700 MHz coexistence testing has been adopted in place of the 800 MHz coexistence testing to reflect future spectrum allocations. Overall the number of RF tests has been rationalised, by removing tests no longer required due to developments in receiver design. The D-Book continues to be
84-535: A laboratory in addition to its adherence and operation under a documented quality system, specific to a Scope of Accreditation. In order for accreditation bodies to recognize each other's accreditations, the International Laboratory Accreditation Cooperation (ILAC) worked to establish methods of evaluating accreditation bodies against another ISO/CASCO standard (ISO/IEC Guide 58 - which became ISO/IEC 17011). Around
112-703: Is a vital resource for the TV and IP industries and a trusted partner to the regulators. The team works to maintain standards across digital TV platforms. Each year DTG technicians produce real-world test reports, white papers, practice guidelines and the D-Book, a list of specifications for UK digital TV. The Zoo at DTG Testing is the UK's only comprehensive testing and accreditation centre for digital TV devices and services. The DTG owns and operates DTG Testing, an ISO 17025 accredited test laboratory in Central London. DTG Testing ensures that digital television products in
140-467: Is the UK's centre for digital media technology. Since 1995, it has been vital to the distribution of TV in the UK – digital TV, interactive TV, the digital TV switchover, on-demand TV, HDTV and UHD TV. The DTG supports the development of pay-TV and other platforms. The DTG was formed in 1995 by the BBC , BSkyB , BT Group , Channel 4 , ITV , NTL Incorporated , Pace and Sony to set technical standards for
168-463: The 2000 version of ISO 9001 with regards to implementing continuous improvement. The 2005 version of the standard comprises four elements: The 2017 version comprises eight elements: Some national systems (e.g. UKAS M10 in the UK) were the forerunners of ISO/IEC 17025:1999 but could also be exceedingly prescriptive. ISO/IEC 17025 allows laboratories to carry out procedures in their own ways, but require
196-528: The Digital Tick, Freeview and Freeview HD logos against the D-Book standard. Many manufacturers, both small and large, have discovered the advantage of revealing problems at this stage, rather than when they have large numbers of products in the shops or in people's homes. The Freeview HD trademark requirements state that any manufacturer wishing to use the Freeview HD logo on a product must pass
224-835: The Inter-American Accreditation Cooperation (IAAC). The first laboratory accreditation bodies to be established were National Association of Testing Authorities (NATA) in Australia (1947) and TeLaRC in New Zealand (1973). Most other bodies are based on the NATA/TELARC model include UKAS in the UK, FINAS in Finland and DANAK in Denmark to name a few. In the U.S. there are several, multidisciplinary accreditation bodies that serve
252-564: The UK implementation was, therefore, reproduced in full. In subsequent editions, it has become possible to reference ETSI or other standards and the previous D-Book section simplified. However, the D-Book as an implementation guideline has become more important as non-UK based manufacturers have sought to introduce products to the UK market. DTG Testing Ltd was established as an independent testing facility where manufacturers can bring prototype products for verification of their interoperability. Many manufacturers, both small and large, have discovered
280-526: The UK market. In March 2009, the DTG published the 6th edition of the D-Book – enabling the launch of an initial three free-to-air HD channels on Freeview by late 2009, as well as the introduction of a broadband return path which has the potential to be used for streaming on-demand video content such as BBC iPlayer , ITV Player and 4oD , accessing e-government services and allowing viewers to complete transactions via their television. It also introduces DVB-T2 ,
308-644: The United Kingdom conform to the D-Book specification – a requirement of obtaining the Freeview trade mark licence. DTG Testing also provide access to: The first edition of the DTG D-Book was written in 1996 when DVB-T was new and untried. From the outset, the D-Book was an implementation guideline and referenced fundamental standards where possible. But many of the component parts of the document had not then achieved stable international standards and
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#1732791907551336-492: The advantage of revealing problems at this stage, rather than when they have large numbers of products in the shops or in peoples homes. As the complexity of the platform increases, the importance of interoperability and test and conformance is bigger than ever. The success of Freeview and Freeview Play continues and is largely down to the reliable products and services on the UK DTT platform. The D-Book has successfully introduced High Definition and DVB-T2, in addition to supporting
364-443: The competence of testing and calibration laboratories is the main standard used by testing and calibration laboratories. In most countries, ISO/IEC 17025 is the standard for which most labs must hold accreditation in order to be deemed technically competent. In many cases, suppliers and regulatory authorities will not accept test or calibration results from a lab that is not accredited. Originally known as ISO/IEC Guide 25, ISO/IEC 17025
392-424: The component parts of the document had not then achieved stable international standards and the UK implementation was therefore reproduced in full. In subsequent editions, it has become possible to reference ETSI or other standards and the previous D-Book section simplified. However, the D-Book as an implementation guideline has become more important as non-UK based manufacturers have sought to introduce products to
420-518: The foundation of every television in the UK and all UK DTT based platforms including Freely, Sky Glass, Freeview Play, Freeview HD, YouView, EETV and NowTV and the UK DSAT platform, Freesat, as well as several international adaptations. The DTG continues to ensure European harmonisation wherever possible, while meeting the needs of the rapidly developing and highly successful UK TV market. ISO 17025 ISO / IEC 17025 General requirements for
448-432: The implementation of digital terrestrial television in the UK. From these initial eight members, the DTG has grown to include over 120 UK and international members and played an important role in the success of the UK television industry. The DTG, working with its members, has identified six priority television technologies. These are: The DTG is a membership association with four categories of membership: DTG Testing
476-406: The laboratory community. These bodies accredit testing and calibration labs, reference material producers, PT providers, product certifiers, inspection bodies, forensic institutions and others to a multitude of standards and programs. These ILAC MRA signatory accreditation bodies carry identical acceptance across the globe. It does not matter which AB is utilized for accreditation. The MRA arrangement
504-432: The laboratory is normally carried out by the national organization responsible for accreditation . Laboratories are therefore "accredited" under ISO/IEC 17025, rather than "certified" or "registered" by a third party service as is the case with ISO 9000 quality standard. In short, accreditation differs from certification by adding the concept of a third party (Accreditation Body (AB)) attesting to technical competence within
532-456: The laboratory to justify using a particular method. In common with other ISO quality standards, ISO/IEC 17025 requires continual improvement. Additionally, the laboratory will be expected to keep abreast of scientific and technological advances in relevant areas. In common with other accreditation standards of the ISO 17000 series (and unlike most ISO standards for management systems), assessment of
560-626: The migration of COM 7&8 T2 multiplexes into the 700 MHz band. In addition, through an analysis of broadcaster requirements, we removed HD/SD LCN switching and Broadcast Record lists. D-Book 11 adopts a number of corrigenda to D-Book 10, defining the profile of UHD to be supported in compatible receivers for broadcast and bringing the HbbTV requirements up to date with recent work by the HbbTV Association and DVB. In recognition that Standard Definition receivers are no longer provided with
588-640: The new modulation scheme that is being used in the UK to deliver these services. In March 2011, the DTG published the 7th edition of the D-Book: the book detailed interoperability specifications for UK digital terrestrial television with extended Connected TV functionality. D-Book 7 provides the baseline specification that service providers such as Sky, Virgin Media and YouView can build on for trademark requirements to support their services. The industry's test centre: DTG Testing tests digital TV products applying for
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#1732791907551616-629: The required DTG Testing Freeview HD tests. Digital TV Group The DTG (Digital TV Group) is the association for British digital television broadcasters and annually publish and maintain the technical specifications for digital terrestrial television (DTT) in the United Kingdom, which is known as the D-Book and is used by Freeview , Freeview HD , FreeSat and YouView . The association consists of over 120 UK and international members who can participate in DTG activities to varying degrees, depending on their category of membership. The DTG
644-538: The specification. Conformance to D-Book standard allows products to use the Digital Tick, Freeview , Freeview + and Freeview HDlogos . The D-Book is only available to members of the Digital TV Group . The first edition of the D-Book was written in 1996 when the current standard for terrestrial broadcasting DVB-T was new and untried. From the outset, the D-Book was an implementation guideline and referenced fundamental standards where possible. But many of
672-436: The standard also forms the basis for accreditation from an accreditation body. There have been three releases; in 1999, 2005 and 2017. The most significant changes between the 1999 and 2005 release were a greater emphasis on the responsibilities of senior management, explicit requirements for continual improvement of the management system itself, and communication with the customer. The 2005 release also aligned more closely with
700-553: The transition of the DTT Platform out of the 700 MHz band which is planned for completion in 2020. D-Book 9 introduced HbbTV references for Freeview Play and the MHEG to HbbTV transition which included the introduction of support for HEVC and High Dynamic Range (HDR) for IP delivered services. D-Book 10 continued to support the developments of products and services with the introduction of Single Frequency Network (SFN) support for
728-847: The world, regions such as the European Community , the Asia-Pacific, the Americas and others, established regional cooperations to manage the work needed for such mutual recognition. These regional bodies (all working within the ILAC umbrella) include European Accreditation Cooperation (EA), the Asia Pacific Laboratory Accreditation Cooperation (APLAC), Southern African Development Community Cooperation in Accreditation (SADCA) and
756-715: Was designed with equal weight across all economies. ABs include: In Canada, there are two accreditation bodies: The accreditation of calibration laboratories is the shared responsibility of the Standards Council of Canada (SCC) Program for the Accreditation of Laboratories-Canada (PALCAN), and the National Research Council of Canada (NRC) Calibration Laboratory Assessment Service (CLAS). The CLAS program provides quality system and technical assessment services and certification of specific measurement capabilities of calibration laboratories in support of
784-492: Was initially issued by ISO/IEC in 1999. There are many commonalities with the ISO 9000 standard, but ISO/IEC 17025 is more specific in requirements for competence and applies directly to those organizations that produce testing and calibration results and is based on more technical principles. Laboratories use ISO/IEC 17025 to implement a quality system aimed at improving their ability to consistently produce valid results. Material in
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