Satellite Transmission StandardsSatellite is one of the few communications industries where open standards are the exception to the rule, and proprietary technology dominates the market. For classical VSAT systems, some industry standards have emerged, while the satellite broadband sector is still dominated by proprietary technologies, despite the emergence of several open standards in recent years.
SCPC (Single Channel per Carrier) is a satellite transmission system that employs a separate carrier for each channel. (MCPC) Multiple Channel per Carrier refers to the multiplexing a number of channels into a common digital bit stream, which is then used to modulate a single carrier that conveys all of the services to the end user. DVB/SCPC is a combination of both schemes, where the forward (downstream) channel takes advantage of the DVB (Digital Video Broadcasting) multiplex while the return channel (upstream) works on the basis of the more classical SCPC. DVB is an ETSI public standard, while SCPC is governed by well adopted public and industry standards.
On the other hand, until now, most satellite broadband providers have been using proprietary technology. Complicating the situation is the emergence of three competing broadband standards: DVB-RCS (Digital Video Broadcasting-Return Channel via Satellite), the satellite version of DOCSIS (Data Over Cable System Interface Standard) and IPoS (IP over Satellite). They are evolving absent any concerted talk of the benefits or advantages of interoperability. Result: Systems that cannot talk to each other. Moreover, the lack of interoperability of hubs and broadband IDUs of the same standard effectively locks customers into single-vendor solutions.
There is necessity of standards to achieve the low-cost, high-performance solutions that are expected to drive demand and growth of two-way broadband satellite. VSAT vendors argue that their customers are more worried about application performance, notably for applications like VoIP and VPN, than about standards. However, Governments are more interested in seeing standard systems deployed. Tenders specify that technologies submitted must be standard-based. DVB-RCS has gained traction in markets like Russia, India and China where government agencies are mandating open standards. India even went as far as to mandate DVB-RCS specifically for its Edusat distance-learning network as well as for its planned telemedicine system. South America is also tilting heavily in the direction of DVB-RCS.
However, proprietary broadband standards are still selling and are expected to retain dominance of the market until at least 2008, indicating that there’s likely going to be room in the sector for both proprietary and standards-based technologies.
LinkStar is a two-way broadband VSAT system
Designed around DVB-RCS for service providers, ISPs, and corporate networks that brings high efficiency high data rates to the market. LinkStar combines broadband access and a high-speed return channel to satisfy bandwidth-intensive applications using IP data over any fixed satellite.
Using the iDirect platform, atrexx provides capabilities to deploy networks that meet all requirements for bandwidth, multiple sites, satellite topology, network frequency or application support.