Paradise Datacom P300-VSAT Installation & Operating Handbook page 25

External Transmit Inhibit
Demodulator Specifications
IF Input Range
Maximum Composite Signal
Frequency Acquisition
Range
Acquisition Threshold
Acquisition Time
(rate ½ FEC)
Clock Tracking Range
Receive Filtering
BER Performance
Viterbi
(all rates)
Sequential
(64kbps)
Sequential
(2048kbps)
Turbo (TPC, QPSK)
(all rates)
8PSK/TCM
(all rates)
8PSK/TCM + Reed-
Solomon
(all rates)
BER performance with
concatenated RS
P300H
By external contact closure or by TTL signal applied to rear panel
connector. Hardware function overrides processor control
-45dBm nominal, ±15dB (desired carrier)
30 dB above level of desired input up to a maximum of 0 dBm
Selectable from ± 1 kHz to ± 32 kHz
< 5 dB Eb/No
@ 9.6 kbps < 3 seconds at 6 dB Eb/No
@ 64 kbps < 2 seconds at 6 dB Eb/No
@ 2048 kbps < 500 ms at 6 dB Eb/No
± 100 ppm min
6th order Butterworth, group delay equalised (INTELSAT IESS compliant)
In all cases met in the presence of two adjacent carriers each 10 dB
higher than the desired carrier, with V.35 scrambling
These figures meet or exceed the relevant IESS performance
specifications.
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
BER improvement depends on n and k values chosen, but a typical
increase in coding gain of 3 dB is possible over basic Viterbi mode.
P300 Modem Installation and Operating Handbook
Rate ½ Rate ¾
-4
4.7 dB 6.1 dB
-8
7.2 dB 8.8 dB
-4
4.3 dB 5.4 dB
-8
6.4 dB 7.3 dB
-4
5.6 dB 6.1 dB
-8
7.5 dB 8.1 dB
-4
2.6dB 3.5dB
-8
3.7dB 4.5dB
-3
-8
-4
-10
1 1 - -
Rate Rate
7.1 dB
9.5 dB
6.4 dB
8.6 dB
6.9 dB
8.4 dB
6.0dB
8.3dB
6.3 dB
10.4 dB
6.1 dB
7.3 dB
Page 25