VSATplus Product Website

Comtech Skywire MDX-420 Satellite Network Gateway


The revolutionary SkyWire™ MDX420 is one of the most innovative satellite products. The system combines the throughput and robustness of a single channel per carrier (SCPC) system with the bandwidth savings of a time division multiple access (TDMA) system.
The SkyWire MDX420 leverages the benefits of each to provide the ultimate in satellite network performance.
The SkyWire MDX420 is the first TDMA broadband satellite system to eliminate the need for high stability references or an expensive central hub with complicated system software. With its revolutionary single hop bandwidth-on-demand capability, the SkyWire MDX420 minimizes system response time to changes in traffic flow. The small efficient burst sizes and ultra low overhead allow the SkyWire MDX420 to provide unprecedented bandwidth efficiency and increased network throughput.
The SkyWire MDX420 system is easy to configure and the auto-everything 10/100/1000 terrestrial data ports provide instant connectivity for any IP application.

Whether you need a TRUE full mesh, a hub and spoke, or a hybrid combination, the SkyWire MDX420 system provides the most cost-effective, easy to use, bandwidth efficient solution available today. And, the system is packaged in a single, secure, one rack unit box.


  • Most bandwidth-efficient TDMA solution available
  • Connect remote sites in a TRUE full mesh, hub and spoke, or hybrid network configuration
  • TDMA network throughput capability of over 86 Mbps and 168,000 pps
  • Multiple Link / Multiple transponder operation
  • Advanced Turbo Product Code FEC
  • Dynamic bandwidth allocation with single hop bandwidth-on-demand functionality
  • Programmable, multi-queued Quality of Service (QoS)
  • Graphical user interface program for monitor and control


The published specifications reflect the maximum SkyWire MDX420 performance. Each SkyWire MDX420 can be configured to customer requirements via hardware / software options applied at the factory or in the field.

SkyWire MDX420 Performance

Modulation &
User Data
Rate Range
BER 1E-8
EnhancedQPSK .710328 kbps –
12.7 Mbps
2.9 dB3.5 dB
EnhancedQPSK .793328 kbps –
14.2 Mbps
3.3 dB3.8 dB
StandardQPSK .793328 kbps –
14.7 Mbps
3.4 dB4.4 dB
Enhanced8PSK .793537 kbps –
20.9 Mbps
6.5 dB7.6 dB
Standard8PSK .793555 kbps –
21.6 Mbps
6.5 dB7.6 dB


ModulationQPSK (8PSK optional)
L-Band Tuning Range950 to 1750 MHz in 1 Hz steps
Impedance50 Ohm
ConnectorN-Type (50 Ohm)
Return Loss10 dB minimum
Output Power0 to -25 dBm
Output Accuracy±1.0 dB over frequency and temperature
Spurious-55 dBc In-band-45 dBc Out-of-band
Harmonics-45 dBc
On/Off Power Ratio>60 dB
Symbol Rate Range.256 to 10 Msps in 1 sps steps
FECTurbo Product Code .710, .793
Internal Stability± 280 ppB± 50 ppB (optional)
Optional BUC Power:3.3 Amps @ 24 V maximum2.8 Amps @ 48 V maximum
BUC Reference10 MHz, +3 dBm ± 3 dB


DemodulationQPSK (8PSK optional)
L-Band Tuning Range950 to 2050 MHz in 1 Hz steps
Impedance75 Ohm
ConnectorF-Type (75 Ohm) female
Return Loss10 dB minimum
Input Level10 x Log (symbol rate) -122 ± 12 dB
Total Input Power-10 dBm or +40 dBc (the lesser)
Symbol Rate Range.256 to 10 Msps in 1 sps steps
FECTurbo Product Code .710, .793
Carrier Acquisition Range± 5% of the symbol rate
LNB DC Power500 mA @ 24 VDC maximum
LNB Reference10 MHz, +3 dBm ± 3 dB

Comtech Skywire MDX-420 Satellite Network Gateway

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