7. (continued) Terrestrial services Allows local, With terrestrial Terrestrial service is Allows local, Allows local, – – – – – – subnational and transmitters in the via LoS reception from subnational and subnational and national terrestrial appropriate frequency satellite. Near beam national services with national terrestrial services with the same bands(3) centre, operating TDM-MCM services with the same modulation with a margins are sufficient modulation in modulation with a single transmitter or to allow partially terrestrial single single transmitter or multiple transmitters blocked terrestrial frequency networks multiple transmitters operating in a single reception (such as by and TDM-QPSK in operating in a single frequency network to trees). Also reception satellite LoS via a frequency network to take advantage of a by highspeed aircraft common receiver take advantage of a common receiver uses small antennas common receiver mounted in LoS Cable distribution Signal can be carried Signal can be carried Signal can be carried Signal can be carried Signal can be carried – – – – – – transparently by cable transparently by cable transparently by cable transparently by cable transparently by cable 8. Programme-associated PAD channel from To be determined(3) PAD comprising text PAD comprising text PAD multiplexing is based data (PAD) capability 0.66 kbit/s to 64 kbit/s (dynamic labels) and (dynamic labels) and on MPEG-2 Systems. Data capacity is available graphics with conditional graphics with conditional services are available using through a reduction of any access control can be access control can be any CDM channel and a channel by the delivered delivered part of CDM channel corresponding amount. Dynamic label for programme and service identification showing on the receiver alphanumeric display is available to all receivers. Basic HTML decoding and JPEG picture decoding is available on receivers with graphic displays (1/4 video graphic array (VGA)), etc. TABLE 1 (continued) Characteristics from DH Digital System A Digital System B Digital System DS Digital System Digital System E Recommendation
7. (continued) – Terrestrial services – Allows local, subnational and national terrestrial services with the same modulation with a single transmitter or multiple transmitters operating in a single frequency network to take advantage of a common receiver – With terrestrial transmitters in the appropriate frequency bands(3) – Terrestrial service is via LoS reception from satellite. Near beam centre, operating margins are sufficient to allow partially blocked terrestrial reception (such as by trees). Also reception by highspeed aircraft uses small antennas mounted in LoS – Allows local, subnational and national services with TDM-MCM modulation in terrestrial single frequency networks and TDM-QPSK in satellite LoS via a common receiver – Allows local, subnational and national terrestrial services with the same modulation with a single transmitter or multiple transmitters operating in a single frequency network to take advantage of a common receiver – Cable distribution – Signal can be carried transparently by cable – Signal can be carried transparently by cable – Signal can be carried transparently by cable – Signal can be carried transparently by cable – Signal can be carried transparently by cable 8. Programme-associated data (PAD) capability PAD channel from 0.66 kbit/s to 64 kbit/s capacity is available through a reduction of any channel by the corresponding amount. Dynamic label for programme and service identification showing on the receiver alphanumeric display is available to all receivers. Basic HTML decoding and JPEG picture decoding is available on receivers with graphic displays (1/4 video graphic array (VGA)), etc. To be determined(3) PAD comprising text (dynamic labels) and graphics with conditional access control can be delivered PAD comprising text (dynamic labels) and graphics with conditional access control can be delivered PAD multiplexing is based on MPEG-2 Systems. Data services are available using any CDM channel and a part of CDM channel TABLE 1 (continued) Characteristics from Recommendation Digital System A Digital System B Digital System DS Digital System DH Digital System E