IPoS and DVB-S2/ACM Standards
IPoS is the world’s leading industry standard, with over 1.2 million compliant terminals shipped to date, and is optimized for delivery of broadband services over satellite channels. All Hughes HN and HX broadband satellite systems and terminals are IPoS compliant.
IPoS specifies a “Satellite Independent Service Access Point” (SI-SAP), which creates a well defined interface between the satellite-dependent functions and the application layers, thereby enabling an open-service delivery platform. Its first version was approved by the world’s major standards organizations in 2005: the Telecommunications Industry Association (TIA) in North America, and ETSI and ITU (International Telecommunications Union) in Europe. In December 2006, ETSI further approved the Internet Protocol over Satellite.v2 (IPoS.v2) air interface standard which incorporates the DVB-S2 industry standard including ACM (Adaptive Coding and Modulation).
With the addition of DVB-S2 including the ACM feature, IPoS-compliant networks yield higher throughputs and up to 50 % more efficient bandwidth utilization over the DVB-S specification. The unique Hughes implementation of the ACM feature means the combination of coding and modulation of the outbound channel can be configured for each remote terminal, resulting in optimum transmission efficiency for each terminal. Link performance is continually optimized even during high rain conditions by adjusting error-correcting codes and modulation dynamically, based on signal quality feedback from remote terminals.
As opposed to other implementations of DVB-S2, which support only constant coding and modulation (CCM), the Hughes ACM implementation typically provides 20 percent additional throughput over CCM. In regions of the world where satellite capacity is scarce, this feature brings additional capacity where it was not previously available.