N6152A datasheet(3/12 Pages) KEYSIGHT

Part #	N6152A

Description	X-Series Measurement Application

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Manufacturer	KEYSIGHT [Keysight Technologies]

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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

Bandwidth

8 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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