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Interactive TV via Internet Protocol (IP TV)
Digital Generation                                                           ...
For the technically minded                                             Digital Terrestrial

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Interactive TV via Internet Protocol (IP TV)


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Interactive TV via Internet Protocol (IP TV)

  1. 1. Interactive TV via Internet Protocol (IP TV) Digital Generation WHY IP TV Digital quality represents the state of the art of modern television technology. In direct qualitative • For its exceptional digital quality picture and sound - in every room. comparisons of picture quality and sound with analogue TV, digital comes out the winner. The differ- • For the greater number of television channels on offer. ence is especially noticable when viewing on high definition LCD televisions. Quality benefits aside, • For the management of subtitles, multilingual audio, and Electronic digital transmission is to become the compulsory norm, since the European Commission has ruled Programme Guide. that after 2012 analogue transmissions will cease in all member countries. WHY IP TV FROM VDA • Already installed in over 50 hotels, it is by far the most tested and More channels. More functions. And Incredible Performance reliable on the market. TV through IP (Internet Protocol Television) is a very efficient platform for distributing TV content • For its complete integration with the PowerTV, interactive television in digital format, especially when deployed across a hotel’s structured cabling network (Cat5e or system. higher). A digital signal is free from the noise and interference that can so often plague co-axial • For its Personal Video Recorder (PVR) function. based analogue systems. A further major advantage is that IP TV permits a far greater number of channels to be made avail- able than was possible with analogue systems. IP TV also provides for a richer and enhanced provi- sion of services, which include, for example, subtitles, multi-language films management, Electronic Programme Guides (EPG) and Personal Video Recorder capability (PVR). The latter, exclusive to VDA, enables guests to record a television programme when they are away from the room.
  2. 2. For the technically minded Digital Terrestrial VDA Multimedia SPA - (DVB-T) Satellite dishes – a description of the IP TV system (DVB-S) PowerTV Central Supervising Unit Application servers: - VOD - Internet - System management ITV Service DVB-T Muxes DVB-S Transponder Local Area Network VOD Servers Recording Recorded IPTV Hotel Areas IPTV Servers and storage channels (DVB Input) (redundancy IPTV Servers server) (Analog Input) Live IPTV Channels (multicasted) IPTV System Analogue sources The standard architecture of an IP TV system is based on a set of hw/sw modules that manage the logical processes of: recep- capsulated” mpeg-2 stream with an average bit rate, which can more servers based on x86 architecture and the Linux opera- tion and acquisition of channels, descrambling, distribution and vary between 2 Mbps and 20 Mbps, depending on the content ting system. Each server can accommodate up to 5 cards, DVB- reproduction. transmitted by broadcasters. The IP TV servers are installed T, DVB-S, or analogue input (those capable of administering a with interface cards (one for each mux or transponder) that single channel output). The cards decode the mpeg-2 stream Reception and acquisition of channels are able to extract mpeg-2 streams from SPTS and pass them contained in the DVB transmission and make them available on The IP TV system requires one or more satellite dishes and/ along the Ethernet network (the same one used by the Active the LAN hotel network in multicast mode. or antennas to receive the digital channels that will be distrib- system). uted throughout the hotel. The antenna cables reach the techni- For optimal performance the TV over IP system requires certain cal centre where the IP TV server (digital headend) is installed. Descrambling prerequisites for the cat5 network hotel system: Ethernet 10/100 They are connected with a multi-switch to obtain the number Descrambling is required only when the programme list contains Mbit Cat5e/Cat6, with fibre optic backbones 100/1000 with layer 3 of ports required. This ‘bouquet’ of channels is carried on the encrypted satellite channels. In this case we use special cards with multicast support and IGMP 2.0. same frequency and is defined as a Multiple Program Transport equipped with a Smart Card reader, or a professional Condition- Stream (MPTS). Depending on the type of transmission, we talk al Access Module (CAM) that descrambles encrypted channels Reproduction about “mux” for digital terrestrial signals and “transponder” for and interfaces with the digital headend using the ASI protocol. PowerTV Clients (HCS9 cards or Set Back Box Active 3 or Power- satellite. The average number of television channels for MPTS TV HD) are able to request a stream (corresponding to a televi- typically ranges between 4 and 7 (depending on the broad- Distribution sion channel) to the IP TV server or “engage” with an existing caster). Each individual MPTS channel is defined as a Single The distribution of channels on the Ethernet network is mana- stream, if it has been established by some other guest. Digital Program Transport Stream (SPTS). Within each SPTS is an “en- ged by the IP TV digital headend, which is made up of one or TV channel selection is via the handheld remote control.