W6152A Datasheet, PDF (3/12 Pages) Keysight Technologies – X-Series Measurement Application

Digital Cable TV Standards Overview
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
Frequency
Bandwidth
Modulation
Randomization
FEC
Trellis coding
Interleaving
Roll-off factor
Stream
J.83 Annex A (DVB-C)
J.83 Annex B (DOSSIS DS)
J.83 Annex C (ISDB-C)
VHF, UHF
8 MHz
16QAM, 32QAM,
64QAM, 128QAM,
256QAM
Polynomial for PRBS
1 + x¹⁴ + x¹⁵
RS (204,188) over GF (256)
No
Convolutional interleaving, depth:
I = 12
0.15
MPEG-2 TS
VHF, UHF
6 MHz
64QAM, 256QAM,
1024QAM
Polynomial for PRBS
3-word polynomial for PRBS
x³ + x + α³ over GF (128), where
α⁷ +α³ +1 = 0
RS (128,122) over GF (128)
concatenated with
convolutional coding
Yes
Convolutional interleaving, depth:
I = 128, 64, 32,16, 8
J = 1, 2, 3, 4, 5, 6, 7, 8, 16
0.18 for 64QAM,
0.12 for 256QAM, 1024QAM
Modified MPEG-2 TS, with
the sync byte replaced by a
parity checksum
VHF, UHF
6 MHz
16QAM, 32QAM, 64QAM,
128QAM, 256QAM
Polynomial for PRBS
1 + x¹⁴ + x¹⁵
RS (204,188) over GF (256)
No
Convolutional interleaving, depth:
I = 12
0.13
MPEG-2 TS
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