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TANDBERG High Definition Professional Recevier/Decoder TT1280 User Manual

Page 105

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Technical Specification

Reference Guide: TT128x High Definition Professional Receiver/Decoder

Page B-13

ST.RE.E10141.5

Parameter Specification

QPSK LDPC FEC rates

1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9. 9/10

8PSK, LDPC FEC rates

3/5, 2/3, 3/4, 5/6, 8/9, 9/10

LDPC FEC Frame length

Normal

Pilot tones

Automatic detection

Symbol rate range

Rs = 5 to 31 MSymbol/s

Symbol rate step

1 Symbol/s

Symbol rate lock range

± 100 ppm

Maximum Channel bit rate

90 Mbit/s

Maximum user bit rate

81 Mbit/s

Es/No (C/No) ratio

See Table B.15

Constellation Output

10

Availability TT1280/HWO/DVBS2/IF/CONST

only

Safety status

SELV

Number of outputs

2 (I & Q)

Output connector type

BNC, female 75

Output impedance

75

Miscellaneous
DVB-S Phase noise tolerance

11

SSB phase-noise power spectral density < -68 – 10*log(Rs/20) dBc/Hz

at

δF = 10 kHz offset

Phase noise power spectral density of the form C – 20*Log(

δF)

δF = Frequency offset from carrier
Rs = Symbol-rate (Msymbol/s)

DVB-S2 Phase noise tolerance

12

-25 dBc/Hz at

δF = 100 Hz

-50 dBc/Hz at

δF = 1 kHz

-73 dBc/Hz at

δF = 10 kHz

-93 dBc/Hz at

δF = 100 kHz

-103 dBc/Hz at

δF = 1 MHz

-114 dBc/Hz at

δF > 10 MHz

LNB power and control

See Table B.16

Table B.14 shows the Eb/No requirements for DVB-S and Table B.15 for

DVB-S2 Es/No requirements to ensure error free demodulation for all

supported FEC rates.

Table B.14: DVB-S2 Satellite Receiver Input – DVB-S Eb/No Ratio

Convolutional FEC Rate

Eb/No Ratio (dB) in IF Loop for correct MPEG-2 system
operation

1/2

4.5

2/3

5.0

3/4

5.5

5/6

6.0

7/8

6.4

10

Enabling this feature disables output transport stream and renders the receiver unable to decode a service.

Operational for DVB-S2 modes only.

11

These specifications apply in the presence of thermal noise at the threshold Eb/N

0

ratio given in Table B.14

12

These specifications apply in the presence of thermal noise at the threshold Es/No ratio given in XXXX and assume a

degradation to the thermal noise performance of 0.3 dB.

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