| Freeview Multiplexes in the UK |
| Last updated: December 28, 2011 |
| If you have any corrections or information about the Freeview Multiplexes, please contact the Astra 2D website. |
| A Multiplex is a method of digital broadcasting in which the a single transmission can be used to combine and transmit television and radio services. The use of sophisticated digital compression techniques, such as MPEG2 and in the future MPEG4, enables many television and radio services to be accomodated on a single multiplex. Several multiplexes will be used from each television transmitter to bring a multitude of channels to the viewer/listener. A multiplex is broadcast on a single UHF channel, using digital technology. |
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| Freeview Lite |
Freeview Lite refers to those areas only served by the public service multiplexes. These areas are served by relays and not by the main transmitters. Commercial multiplexe opperators have decided that in certain areas (due to their small populations), that it is not ecconomically viable to broadcast their services to certain (mainly rural) areas. Most affected are northern and central Wales, the Scottish Highland and islands, parts of England, the Isle of Man and the Channel Islands.
Viewers with limited or poor Freeview reception, can receive most Freeview channels on satellite, either through Freesat or Freesat from Sky. |
| For detailed information about Freeview Lite, click HERE. |
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| 64 QAM (2/3) |
| In 64 QAM, the digital TV signal is transmitted in groups of 64 symbols. The "forward error correction" is 2/3, and this results in a bitrate of 24Mb/s (megabits per second). This can be used to carry up to eight simultaneous television channels. |
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| 16 QAM (3/4) |
| In 16 QAM mode, the digital TV signal is transmitted in groups of 16 symbols. The "forward error correction" is 3/4, and this results in a bitrate of 18Mb/s. This can be used to carry four or five simultaneous television channels. |
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| Service Information (SI) Explaind |
| EIT (Event Information Table) |
| Th Event Information Table, contains information about present, following and future events. |
| PAT (Programme Association Table) |
| Provides the link between the transport stream id, the programme number and the proramme map id (PMT). |
| PMT (Programme Map Table) |
| When pointed to by the PAT, the PMT provides the associated group of elements (video, audio etc.), with the progamme number. |
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| Freeview Multiplexes in England (Pre-DSO) |
| Freeview Multiplexes in England (Post DSO) |
| Freeview Multiplexes in Scotland |
| Freeview Multiplexes in Wales |
| Freeview Multiplexes in Northern Ireland |
| Freeview Multiplexes in the Channel Islands |
| Freeview Multiplexes in the Isle of Man |
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