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Paradise Datacom Evolution Series PD55L-MIL L-Band Satellite Modem

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  • Military Standards Compliant
  • Field upgradeable feature set
  • Paired Carrier Operation (optional)
  • Built-in 1:1 Redundancy Controller


Common Main Specifications
Modulation SchemeBPSK, QPSK, OQPSK, 8PSK (Option), 8APSK (Option), 16QAM (Option)
IF Frequency Range950 MHz to 1950 MHz
IF Frequency Resolution100Hz
Traffic Interface - ElectricalEthernet (10/100 BaseT) IP Traffic on RJ45 with link and traffic indicators. Electronically Selectable with other interfaces fitted
Traffic Interface - OptionsRS422 including X.21 DCE and DTE

emulation, V.35 and RS232 on EIA530 connector

25 pin female D-type (Option) EIA530 maximum

10Mbps, RS232 max 100kbps

LVDS 25 pin female D-type (Option)

HSSI 50 pin HD SCSI-2 connector (Option)

G.703 balanced on EIA530

G.703 unbalanced on BNC female 75O
User Traffic Data Rate4.8kbps - 10Mbps

Extends base operation to 16,896kbps (Option)

Extends 16,89625kbps to 25Mbps (Option)

Extends 25Mbps to 55Mbps (Option)

Extensions are cumulative
User Traffic Data Rate Resolution1bps

The combination of FEC Rate, Modulation scheme and Satellite Overhead limits the Traffic Data Rate Range in all modes.
User Data Rate Range - Closed Network4.8kbps to 55Mbps no Satellite Overhead (with high Data Rate options)
User Data Rate Range - Minimum Overhead

(Closed Network Plus ESC)
As Closed Network above except limits inclusive of overhead of approximately 1.4 times the ESC baud rate. Resolution of 1bps. Supports ESC rate from 110 baud to >38.4 kbaud.
User Data Rate Range - IBS/SMS Option4.8kbps to 10 Mbps (6.7% Satellite Overhead added). Resolution of 1bps.
User Data Rate Range - IDR Option4.8 kbps to 10 Mbps (96k overhead added) Resolution of 8k (limitation of frame structure)
Audio Channels OptionUsed with IBS/SMS satellite framing and IDR Options to provide 2 x audio 32kbps ADPCM coded channels within a 64kbps IBS carrier, and 2 x audio 32kbps ADPCM coded channels plus 64kbps data within a 128kbps IBS carrier
Inner Forward Error CorrectionViterbi BPSK/QPSK/OQPSK - Rates 1/2, 3/4, 7/8, k=7 to IESS-308/309

Option: TCM 8PSK - Rate 2/3 to IESS-310

Option: TPC BPSK/QPSK/OQPSK - Rates 5/16, 21/44, 0.493 (Paradise), 2/3, 3/4, 0.789 (Paradise), 7/8 (Paradise), Rate 7/8 de facto

Options: TPC 8PSK - Rates 3/4 de facto, 7/8 de facto

Options: TPC 16QAM - Rates 3/4 de facto, 7/8 de facto
Outer Forward Error CorrectionConcatenated Intelsat Reed-Solomon Outer Codec to IESS308/310 with Custom Option offering variable code rate up to 10 Mbps.
Scrambling - IBS/SMS OptionSynchronised to framing per IESS-309 up to 10 Mbps
Scrambling - IDR

Option and Closed Network
With RS Coding: synchronised to RS overhead.

Without RS Coding and Non-TPC FEC: V.35 self synchronising

No RS Coding with TPC FEC: 212-1 up to 10 Mbps
Scrambling - Closed Network Plus ESC32kbps or above: synchronised to ESC overhead.

Less than 32kbps: as per closed network.

V.35 Scrambler has CCITT Intelsat "FDC" and "Linkabit" modes up to 55Mbps (with high Data Rate options)
Scrambling - OM-73 OptionOM-73 compliant scrambling
L-Band ConnectorsN-type female
Return Loss14 dB typical
L-Band Impedance50O
External ReferenceClocking Only: 1-10MHz in 1kHz steps.

Clocking and RF Frequency: 10MHz, 0dBm±1dB
Modulator Specifications
Output Power Level-5 to -30dBm Continuously Variable in 0.1dB steps
Output Level Stability±0.5dB
Transmit FilteringIntelsat IESS compliant.A=0.35
Occupied Bandwidth1.2 times Symbol Rate
Recommended Channel Spacing1.4 times Symbol Rate
Phase Accuracy±2° maximum
Amplitude Accuracy±0.5dB maximum
Carrier Suppression-30 dBc minimum
Output Phase NoiseAs IESS-308, nominally 3 dB better.
Output Frequency Stability<1ppm/yr

7.5E-8/yr with High Stability Reference Option
HarmonicsBetter than -55dBc/ 4kHz in band

No worse than -45dBc out of band to 5GHz is re-inserted into the terrestrial multi-frame in the
SpuriousBetter than -55dBc/ 4kHz in band

No worse than -40dBc out of band 10MHz to 5GHz
Transmit On/Off Ratio55 dB minimum
External Transmit InhibitBy external contact closure or by TTL signal applied to rear panel Alarms & AGC connector
Demodulator Specifications
Input Range-20 to -70dBm wanted signal
Maximum Composite Signal35dB above level of desired input up to a maximum of 10dBm
Frequency Acquisition RangeSelectable from ±1kHz to ±32kHz up to 10 Mbps (1kHz steps)

±10kHz to ±250kHz from 10 to 55 Mbps (10kHz steps)
Acquisition Threshold<5dB Es/No QPSK
Clock Tracking Range±100ppm minimum
Receive FilteringIntelsat IESS compliant. A=0.35
Performance MonitoringMeasured Eb/No (range 0-15dB, ±0.2dB).

Measured Frequency Offset (100Hz resolution).

Wanted signal level strength indicator centred on the middle of the Rx. Input range.
AGC OutputBuffered direct AGC output for antenna tracking etc.
Acquisition TimeAt 9.6kbps, less than 1s at 6dB Es/No. QPSK

At 10 Mbps, less than 100ms at 6dB Es/No. QPSK
BER Performance


Turbo (TPC)1E-4
Turbo (TPC)1E-4
Turbo (TPC)1E-3
(all rates) 
Rate 1/2Rate 3/4Rate 7/8Rate 2/3
4.7 dB
6.1 dB
7.1 dB
7.2 dB
8.8 dB
9.5 dB
2.7 dB
3.5 dB
4.1 dB
3.3 dB
4.5 dB
4.5 dB
5.6 dB
6.8 dB
6.8 dB
7.2 dB
6.5 dB
7.7 dB
7.8 dB
8.2 dB
6.3 dB
10.4 dB
6.1 dB
7.3 dB
Clocking and Buffering Specifications
Clock IntegrityFrequency Locked Loops give phase-hit immune operation even with poor clock sources such as routers etc.
Tx Clocking



    Rx Clock


Standard (±1ppm)

7.5x10E-8/yr with High Stability Option

Tracking range ±100ppm/min

Slaves Tx timing from Rx clock.

(includes full asymmetric operation)
Rx Clocking

    Buffer Disable

    Tx Input clock


    External timing clock(DTE interface only)

Clock from Satellite


(Includes full asymmetric operation)

Standard (±1ppm)

7.5E-8/yr with High Stability Option

Station Reference Inputs75O BNC female Station Clock Connector, transformer isolated.

1MHz to 10MHz in 1kHz steps (accepts sinusoidal >0dBm or square-wave e.g., G.703 para 10

120O RS422 compatible input, 1MHz to 10MHz in 1kHz steps via Async ESC connector

NB: When set to 10MHz, the station reference may replace internal reference to all internal circuitry and reference outputs on the IF ports. The unit automatically switches back to internal reference if the station reference fails.
Buffer SizeSelectable in 1ms increments from 0ms to 99ms at data rates up to 42Mbps and from 0 ms to 80 ms at data rates from 42Mbps up to 55Mbps .

Automatically adjusted to slip an integer number of terrestrial multi-frame lengths for framed rates Buffer storage: Maximum buffer size - 256 kbytes
Framing and Deframing Specifications
Closed Network FormatUnframed, no overhead.
IBS/SMS Option FormatIntelsat IBS to IESS-309 and IESS-310 up to 10 Mbps, and Eutelsat SMS to EESS501.
IDR Option FormatIntelsat IDR to IESS-308 and IESS-310 up to 10 Mbps.
Closed Network plus ESC FormatProvides variable rate asynchronous ESC, optional synchronous scrambler above 32kbps to replace error multiplying V.35 scrambler, optional backward alarm facility and optional timeslot ID maintenance when used with Drop/Insert, all in minimum possible overhead down to <0.5%
Poor BER PerformanceDeframer includes extended threshold operation that improves performance when used with Reed- Solomon in very poor BER conditions (where a single uncorrectable RS codeword can contain enough corrupt frame alignment words to knock an Intelsat specified deframer out of frame sync). Up to 10 Mbps

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