BTC Z22 Bedienungsanleitung PDF herunterladen (Seite 28)

Version 02.00, November 2014

28 Rohde & Schwarz R&S

BTC Broadcast Test Center

J.83/A/B/C coder (DVB-C, US Cable, ISDB-C; R&S

BTC-K502 option)

The J.83/A/B/C coder includes the DVB-C, J.83/B and ISDB-C standards.

DVB-C, ISDB-C (R&S

BTC-K502 option)

DVB-C

in line with EN 300429 (ITU-T J.83/A)

ISDB-C

in line with ITU-T J.83/C

Modulation

mode

16QAM, 32QAM, 64QAM,

128QAM, 256QAM

symbol rate

0.1 Msps to 8 Msps, settable

pulse filtering

root raised cosine rolloff (α = 0.15, 0.13)

MER

> 40 dB

modulation frequency response

±0.25 dB

shoulder attenuation

> 48 dB

Special functions

energy dispersal, Reed-Solomon encoder

(204, 188, t = 8), convolutional interleaver

can be switched off

Test signals

TS test packet (see “Internal test signals”)

PRBS before mapper

J.83/B (R&S

BTC-K502 option)

J.83/B

in line with ITU-T J.83/B

Modulation

mode

64QAM, 256QAM, 1024QAM

bandwidth

6 MHz

symbol rate

64QAM

5.056941 Msps ± 5 %

256QAM

5.360537 Msps ± 5 %

1024QAM

5.360537 Msps ± 5%

pulse filtering

root raised cosine rolloff,

α = 0.18 (64QAM),

0.12 (256QAM/1024QAM)

MER

> 44 dB

modulation frequency response

±0.25 dB

shoulder attenuation

64QAM

> 55 dB

256QAM

> 55 dB

1024QAM

> 55 dB

Coding

input data rate

64QAM

26.97035 Mbit/s

256QAM

38.81070 Mbit/s

1024QAM

49.02525 Mbit/s

data interleaver

can be switched off, level 1 and level 2

Special functions

randomizer, Reed-Solomon encoder,

interleaver, checksum

can be switched off

Test signals

TS test packet (see “Internal test signals”)

PRBS before Trellis encoder

PRBS before mapper

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