DVB-RCS
DVB-RCS stands for Digital Video Broadcasting - Return Channel via Satellite. It is a European Telecommunications Standards Institute (ETSI) standard for enabling two-way broadband communications via satellite. Specifically, DVB-RCS provides the return channel (uplink) from user terminals to a satellite hub, complementing a forward link (downlink) often provided by a DVB-S (Digital Video Broadcasting - Satellite), DVB-S2, or other suitable transmission system.
DVB-RCS enables interactive services over satellite, such as internet access, video conferencing, and other data applications. It defines the physical layer and the data link layer protocols for the return channel, including modulation schemes, error correction, and access methods.
Key features of DVB-RCS include:
- Demand Assigned Multiple Access (DAMA): DVB-RCS systems typically employ DAMA techniques to efficiently allocate bandwidth on the return channel based on user demand. This allows for flexible and scalable service delivery.
- TDMA/MF-TDMA: Time Division Multiple Access (TDMA) and Multi-Frequency Time Division Multiple Access (MF-TDMA) are common access methods used in DVB-RCS systems. These methods divide the available bandwidth into time slots and/or frequency channels, allowing multiple users to share the return channel capacity.
- Error Correction: Robust error correction techniques, such as Forward Error Correction (FEC), are employed to ensure reliable data transmission over the satellite link.
- Security Features: DVB-RCS incorporates security mechanisms, such as encryption and authentication, to protect user data and prevent unauthorized access.
DVB-RCS2 is a subsequent generation of the standard providing improved performance and capabilities.