Introduction
DVBTM specifications cover all aspects of digital television from transmission through interfacing, conditional access and interactivity for digital video, audio and data.
DVB-S was the first DVB standard for satellite, defining the framing structure, channel coding and modulation for 11/12 GHz satellite services in EN 300 421. The DVB‑DSNG EN 301 210 standard specified, in addition to the DVB‑S format, the new modulations for satellite news gathering and contribution services.
Digital satellite transmission technology has evolved considerably since the publication of the original DVB-S specification. DVB-S2 defines a "second generation" modulation and channel coding system for a very flexible standard, covering a variety of applications by satellite. New coding and modulation schemes as well as a new framing structure permit greater flexibility and more efficient use of capacity, and reasonable receiver complexity.
DVB‑S2 is compatible with Moving Pictures Experts Group (MPEG‑2 and MPEG‑4) coded TV services, with a Transport Stream packet multiplex.
DVB-S2X targets the core application areas of DVB-S2 and new application areas requiring very-low carrier-to-noise and carrier-to-interference operation (VL-SNR), such as mobile applications. It also provides format to enable beam hopping operations.
Our Role & Activities
ETSI standards for DVB system specifications are developed in the ETSI/EBU/CENELEC Joint Technical Committee 'Broadcast', based on proposals from the DVB Project, an industry-led consortium.
The second generation Digital Video Broadcasting by Satellite (DVB-S2) is defined in European Standard EN 302 307-1, which details these improved modulation and coding schemes, enhancing the efficiency of the space segment and giving the basis for providing interactive services.
The extensions of the DVB-S2 system, defined to enlarge the fields of applicability of the DVB-S2 standard, are identified by the S2X denomination, DVB-S2X has been defined in EN 302 307-2.
With DVB-S2 standard, the system has been optimized for the following broadband satellite applications:
- Broadcast Services (BS) Digital multi‑programme Television (TV)/High Definition Television (HDTV): Broadcasting services to be used for primary and secondary distribution in the Fixed Satellite Service (FSS) and the Broadcast Satellite Service (BSS) bands.
DVB‑S2 is intended to provide Direct‑To‑Home (DTH) services for consumer Integrated Receiver Decoder (IRD), as well as collective antenna systems (Satellite Master Antenna Television ‑ SMATV) and cable television head‑end stations. - Interactive Services (IS) Interactive data services including Internet access:
DVB‑S2 is intended to provide interactive services to consumer Integrated Receiver Decoders and to personal computers, where DVB‑S2's forward path supersedes the DVB‑S standard for interactive systems. The return path can be implemented using various DVB interactive systems, such as Return channel by satellite DVB‑RCS (EN 301 790) and DVB-RCS2 series (EN 301 545-2 and TR/TS 101 545-x).
EN 301 790defines the first generation of DVB-RCS which is a system providing an interaction channel for satellite distribution systems. DVB-RCS2 series (EN 301 545-2 and TR/TS 101-545-x) describes how such system can be built on the physical and MAC layers to provide an efficient way of turning a satellite broadcast TV into a full VSAT solution capable of transporting IP traffic in a satellite-only system.
ETSI Technical Specification TS 101 790 provides guidelines for the use of the DVB-RCS specification. - Digital TV Contribution and Satellite News Gathering (DTVC/DSNG)
DVB-S2 includes provision for Digital TV Contribution and Satellite News Gathering (DTVC/DSNG) applications by satellite, consisting of point to point or point to multipoint transmissions, connecting fixed or transportable uplink and receiving stations. - Data content distribution/trunking and other professional applications (PS)
These services are mainly point-to-point or point-to-multipoint, including interactive services to professional head-ends, which re-distribute services over other media.
DVB-S2X reuses the DVB-S2 system architecture, while adding finer MODCOD steps, sharper roll-off filtering, technical means allowing time-slicing of wide-band signals (for a reduced processing speed in the receiver), technical means for bonding of multiple transponders and additional signalling capacity by means of an optional periodic super-frame structure, extended PLHEADER signalling schemes and the support of GSE‑Lite signals. Optional formats are also included to enable operation of beam hopping. The specified waveforms provide additional signalling and framing options that support both periodic, pre-scheduled beam hopping operation, as well as random, traffic driven illumination policy, at signal to noise ratios ranging from -10 dB and above.
STANDARDS
A full list of related standards in the public domain is accessible via the Standards Search.