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P300H P300 Series Modem Installation and Operating Handbook Page 25
Harmonics and Spurious Better than - 55dBc/4 kHz
Transmit On/Off Ratio 55dB minimum
External Transmit Inhibit By external contact closure or by TTL signal applied to rear panel
connector. Hardware function overrides processor control
Demodulator Specifications
IF Input Range P300: -45dBm nominal, ±15dB (desired carrier)
P310: -20 to -70dBm (desired carrier)
Maximum Composite Signal P300: 30dB above level of desired input up to a maximum of 0dBm
P310: 35dB above level of desired input up to a maximum of -10dBm
Frequency Acquisition Selectable from ± 1 kHz to ± 32 kHz
Range
Acquisition Threshold < 5dB Eb/No
Acquisition Time @ 9.6 kbps < 3 seconds at 6dB Eb/No
(rate ½ FEC) @ 64 kbps < 2 seconds at 6dB Eb/No
@ 2048 kbps < 500 ms at 6dB Eb/No
Clock Tracking Range ± 100 ppm min
Receive Filtering 6th order Butterworth, group delay equalised (INTELSAT IESS compliant)
BER Performance In all cases met in the presence of two adjacent carriers each 10dB
higher than the desired carrier, with V.35 scrambling
These figures meet or exceed the relevant IESS performance
specifications.
Rate ½ Rate ¾ Rate
Rate
Viterbi
(all rates)
1 x 10 4.7dB 6.1dB 7.1dB
-4
1 x 10 7.2dB 8.8dB 9.5dB
-8
Sequential
(64kbps)
1 x 10 4.3dB 5.4dB 6.4dB
-4
1 x 10 6.4dB 7.3dB 8.6dB
-8
Sequential
(2048kbps)
1 x 10 5.6dB 6.1dB 6.9dB
-4
1 x 10 7.5dB 8.1dB 8.4dB
-8
Turbo (TPC, QPSK)
(all rates)
1 x 10 2.6dB 3.5dB 6.0dB
-4
1 x 10 3.7dB 4.5dB 8.3dB
-8
8PSK/TCM
(all rates)
1 x 10 6.3dB
-3
1 x 10 10.4dB
-8
8PSK/TCM + Reed- 1 x 10 6.1dB
Solomon
(all rates)
-4
1 x 10 7.3dB
-10