TANDBERG High Definition Professional Recevier/Decoder TT1280 User Manual
Page 105
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
Ω
Output impedance
75
Ω
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.