COMSAT Enhanced Mobile Satellite Services (EMSS) Certus™

COMSAT has been awarded an exclusive multi-year contract to support all DoD EMSS users.


Iridium Certus℠ Network

Certus is the only fully global data and voice network. Satellite and ground redundancy offers exceptional network availability to five nines due to its unique LEO architecture with 66 interconnected satellites (9 in-orbit spares and 6 ground spares) and gateways.


Network Security and Performance

The meshed constellation cross-links provide path resiliency as satellites are linked in front, behind and in adjacent orbits. Rapid satellite transitions and interconnections minimize the impact of network performance anomalies.

Certus offers shorter transmission paths, stronger signals, lower latency and shorter registration time than GEO satellites. This is the only COMSATCOM network that lands in a DoD Gateway and the only COMSATCOM network that doesn’t traverse foreign soil, furthermore DoD traffic has priority across the network.

Certus is compatible with the existing Iridium network and devices for backwards compatibility and service continuity.


Benefits to DoD Users

  • EMSS Discount pricing
  • 3 voice lines
  • Purchase hardware, SIM cards and airtime through DISA Storefront Or COMSAT directly
  • All traffic lands at the DoD Gateway
  • Traffic does not traverse foreign soil, user terminal connects directly to Gateway via inter-satellite links
  • 24/7 NOC and Customer Care supported by cleared staff in the US


IP Data

Background IP throughput is determined by the terminal class.

Background IP supports applications such as encrypted voice up to video backhaul from UAVs.

Iridium Certus 20 22 / 22 Kbps
Iridium Certus 100 88 / 88 Kbps
Iridium Certus 200 176 / 176 Kbps
Iridium Certus 350 352 / 352 Kbps
Iridium Certus 700 352 / 704 Kbps
Iridium Certus 1000 512 / 1408 Kbps


Streaming Data (Available mid 2019)

Certus offers background IP and Streaming IP services.

Streaming IP Data provides virtual circuits (VC) of; 4.8 Kbps, 9.6 Kbps, 14.4 Kbps, 28 Kbps, 40 Kbps, 56 Kbps, 128 Kbps, 168 Kbps and 256 Kbps.


Iridium Burst (Short Burst Data)

True broadcast messaging offers high power broadcast to many.

  • One-to-many distribution
  • Applications:
    • FFT – Friendly Force Tracking
    • Asset Tracking
    • Command and control
    • Integrates into any DoD COP
    • Global secure text messaging over SATCOM


High Quality Voice

New and improved voice codec for delivering superior voice quality.

  • Double bandwidth allocated to HQ calls
  • Near toll-quality (3.5 MOS)
  • Low latency for real-time connection
  • Minimized distortions

Provides cellular phone-type voice quality in mobile satellite networks.

Push to Talk


  • Projected upgrade in 2019.