Q-Flex Modem Rack-Mount Point-to-Point

Paradise Datacom

Q-Flex Modem Rack-Mount Point-to-Point

Wholesale Distributor

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  • Dual IF/L-band operation
  • Data rates to 200Mbps
  • DVB-S2X, FastLink LDPC & TPC

SKU: PDD139 Tags: , , ,
  • Description
  • Technical Specifications
  • Support Documents

Q-Flex Modem Overview

The Q-Flex modem embodies a new concept in satellite modem technology – a flexible software-defined modem that does what you want, now and in the future.

The Q-Flex’s flexible hardware platform now provides point-to-point and point-to-multipoint operation in one unit. The Q-Flex™ modem is ideal for handling IP traffic but can be fitted with virtually any type of terrestrial interface and operates at up to 200Mbps. Flexible pricing is achieved by enabling only the features you need at any time. Futureproofing is assured by convenient software upgrades via Ethernet or a memory stick.

Advanced Bandwidth-Efficient Features

The Q-Flex modem supports the most powerful bandwidth-saving technology available. DVB-S2X, the successor to the highly robust and bandwidth-efficient DVB-S2, is supported and includes spectral roll-offs as low as 5%. Paired Carrier overlays transmit and receive carriers reducing satellite bandwidth by 50% (using ViaSat’s patented PCMA technology). FastLink low-latency LDPC is optimised for latency-sensitive applications while giving coding gain that is close to the theoretical limits. Bandwidth-saving IP features include ACM, acceleration and header and payload compression.

Q-Flex Modem Spectrum Analyzer

Built-in Spectrum Analyzer showing LinkGuard™ Signal-Under-Carrier interference detection without/with interferer present.


  • Dual IF/L-band operation
  • Data rates to 200Mbps
  • XStream IP advanced IP optimization suite, including TCP acceleration, header & payload compression, dynamic routing, traffic shaping, encryption & ACM
  • DVB-S2X, FastLink LDPC & TPC
  • Terrestrial interfaces include Ethernet & optical Ethernet, EIA-530, G.703 & ASI
  • Optimized spectral roll-offs, including 5%
  • Paired Carrier carrier overlay
  • LinkGuard signal-under-carrier interference detection
  • Built-in spectrum & constellation monitors
  • DVB Carrier ID. Fully compliant with DVBCID standard
  • Multi-demod option
  • Q-NET Navigator network M&C application included as standard
  • DVB-S2X modulation up to 256APSK

Markets and Applications

  • IP trunking and IP backhaul
  • Corporate networking
  • Mobile/G.703 backhaul
  • Disaster recovery
  • Maritime, oil & gas communications
  • Broadcast
  • Intelligence gathering
Main Specifications
Frequency IF: 50 to 90MHz & 100 to 180MHz
(resolution 100Hz) (BNC connector)
L-band: 950 to 2150MHz
(resolution 100Hz) (N-type connector)
Data Rate Standard: 2,048kbps
Options: 5Mbps, 10Mbps, 25Mbps, 60Mbps, 100Mbps and 200Mbps
Data Rate Limits DVB-S2X (including DVB-S2):
100kbps to 200Mbps
‘Low-cost DVB-S2’ option:
350kbps to 132Mbps
FastLink™ LDPC: 18kbps to 100Mbps
TPC: 4.8kbps to 60Mbps
1bps resolution
Symbol Rate Limits DVB-S2X (including DVB-S2):
100ksps to 50Msps
‘Low-cost DVB-S2’ option:
350ksps to 37.5Msps
FastLink™ LDPC: 18ksps to 40Msps
TPC: 9ksps to 40Msps
Operating Modes DVB-S2X (EN 302 307-2) option
DVB-S2 (EN 302 307-1) option
Closed Network (+ ESC) (IESS-315)
IBS/IDR (IESS-308/309/310/314) options
Scrambling DVB-S2/DVB-S2X: As EN 302 307
IBS: As IESS-309
Closed Network + ESC: Synchronised
to ESC overhead
Impedance IF: 50Ω/75Ω; L-band: 50Ω
Return Loss IF: >18dB; L-band: >15dB
Redundancy 1:1 through 1:16 redundancy
Traffic Interfaces
Standard: Gigabit Ethernet (single RJ45) for IP traffic
Options: 4-port Gigabit Ethernet switch (extends base modem
Ethernet traffic port with another 3 Ethernet ports,
creating 4-port switch)
Optical Gigabit Ethernet/STM-1/OC-3 (Small Form-
Factor pluggable module supporting all common optical
EIA-530 (RS422, X.21, V.35 and RS232 on 25-pin
D-type female)
G.703 E1/T1, E2/T2, E3/T3 (balanced on RJ45;
unbalanced 75Ω BNC female)
Quad E1 G.703 (balanced RJ45)
Quad ASI (75Ω BNC female)
Serial LVDS (25-pin D-type female)
HSSI (50-pin HD SCSI-2 connector)
IDR (to IESS 308; 50-way female D type connector)
Output Power IF: 0 to –25dBm (0.1dB steps)
L-band: 0 to –40dBm (0.1dB steps)
Output Power
Stability: ±1.0dB, 0ºC to 50ºC
Accuracy: ±0.375dBm
Transmit Filter Roll-off 5%, 10%, 15%, 20%, 25%, 35%
Phase Accuracy ±2º maximum
Amplitude Accuracy ±0.2dB maximum
Carrier Suppression -30dBc minimum
Output Phase Noise As EN 302 307, EN 300 421, IESS-308 & EN 301 210
Harmonics & Spurious Better than –60dBc/ 4kHz in-band (at 0dBm to –30dBm output)
Transmit On/Off Ratio -65dB minimum
BUC PSU Option 24V or 48V DC via IFL cable, 200W
BUC 10MHz Reference Via IFL cable; 10MHz ± 0.01 ppm; 3dBm ± 3dB
FSK Control Allows monitor & control of a compatible L-band BUC from the modem via the Tx IFL cable
Input Range IF minimum:
-115 + 10 log (symbol rate)
L-band minimum:
-130 + 10 log (symbol rate)
IF/L-band maximum:
-80 + 10 log (symbol rate)
Maximum Composite +10dBm
Wanted-to-composite F: -94 + 10 log (symbol rate)
L-band: -102 + 10 log (symbol rate)
Frequency Sweep Width ±1kHz to ±250kHz
(1kHz steps)
Acquisition Time Dependent on FEC, data rate and sweep width
Clock Tracking Range ±100ppm minimum
Receive Spectral Roll-off 5%, 10%, 15%, 20%, 25%, 35%
LNB 10MHz Reference Via IFL cable; 10MHz ± 0.01 ppm; 0dBm ± 3dB
LNB Voltage Selectable 13V, 15V, 18V or 24V DC to LNB via IFL cable; maximum 0.5A
Size 1U chassis, 410mm deep excluding front panel handles and rear panel connectors and fans
Weight 3.5kg
Power Supply 90 to 264VAC, 1A @100V, 0.5A @ 240V, 47 to 63Hz
Fused IEC connector (live and neutral fused); 24V and 48V DC options
Compliances FCC, CE and RoHS compliant
Safety Standards EN60950-1:2006
Emissions & Immunity Emissions: EN55022:2010 Class B
Immunity: EN55024:2010
Operating Temperature Standard: 0 to 50ºC
(storage: -40ºC to 70ºC)
Extended: 0 to 55ºC when fitted with
Ruggedisation option
Humidity 95% relative humidity, noncondensing

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