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N6152A Datasheet(PDF) 3 Page - Keysight Technologies |
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N6152A Datasheet(HTML) 3 Page - Keysight Technologies |
3 / 12 page 3 The digital cable TV measurement application includes three standards of digital video broadcasting over cable: DVB-C (J.83 Annex A), J.83 Annex B, and J.83 Annex C. DVB-C (J.83 Annex A) DVB-C is the DVB European con- sortium standard for the broadcast transmission of digital television over cable, mainly used in Europe and Asia with 8 MHz bandwidth. J.83 Annex B (DOCSIS DS) J.83/B, widely used in North America as digital television over cable and the same as the DOCSIS DS physical layer, has a greater difference in FEC coding and occupies a bandwidth of 6 MHz. J.83 Annex C (ISDB-C) J.83/C, mainly used in Japan as digital television over cable and also called ISDB-C, has identical structure as DVB-C, except for the channel band- width (6 MHz for J.83/C and 8 MHz for DVB-C) and roll-off factor of the baseband filter. Table 1. Key parameters in digital cable TV standards J.83 Annex A (DVB-C) J.83 Annex B (DOSSIS DS) J.83 Annex C (ISDB-C) Frequency VHF, UHF VHF, UHF VHF, UHF Bandwidth 8 MHz 6 MHz 6 MHz Modulation 16QAM, 32QAM, 64QAM, 128QAM, 256QAM 64QAM, 256QAM, 1024QAM 16QAM, 32QAM, 64QAM, 128QAM, 256QAM Randomization Polynomial for PRBS 1 + x14 + x15 Polynomial for PRBS 3-word polynomial for PRBS x3 + x + α3 over GF (128), where α7 +α3 +1 = 0 Polynomial for PRBS 1 + x14 + x15 FEC RS (204,188) over GF (256) RS (128,122) over GF (128) concatenated with convolutional coding RS (204,188) over GF (256) Trellis coding No Yes No Interleaving Convolutional interleaving, depth: I = 12 Convolutional interleaving, depth: I = 128, 64, 32,16, 8 J = 1, 2, 3, 4, 5, 6, 7, 8, 16 Convolutional interleaving, depth: I = 12 Roll-off factor 0.15 0.18 for 64QAM, 0.12 for 256QAM, 1024QAM 0.13 Stream MPEG-2 TS Modified MPEG-2 TS, with the sync byte replaced by a parity checksum MPEG-2 TS Digital Cable TV Standards Overview |
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