Satellite/IP Hybrid Broadcast Distribution in Action

Ciro A. Noronha, Ph.D. RIST Forum President CTO, Cobalt Digital

Whether distributing live sports content to affiliates around the globe or distributing programming to local TV stations or cable head-ends, broadcasters have long relied on satellite as an efficient way to send content to many receivers at the same time.

This has historically been done using the C-band proportion of the electromagnetic spectrum, which is reliable and not generally susceptible to rain fade. However, this same part of the spectrum is also in demand by cellular networks, and so some regulatory authorities (such as the FCC in the US) are planning on allocating remaining C-band spectrum to cellular companies. The upshot of this for broadcasters is that C-band will become less available, so broadcasters will have to use Ku-band or Ka-band instead. This is problematic because unlike C-band, which as mentioned is not affected by rain fade, Ku and Ka-band are both highly susceptible to rain fade, which can cause data to be corrupted or lost during transmission.

We’ve been talking about this for a while at RIST, which is why we developed the RIST Satellite-Hybrid In-Band Method (VSF TR-06-4 Part 7). Using this technique, broadcasters can use the satellite as the primary one-to-many distribution method, and the Internet to fill in the gaps, using RIST to retransmit whatever data was not correctly received from the space segment. This allows broadcasters to use Ku/Ka bands with the same reliability as C-band. We talked about this very matter in detail in a previous blog.

End-to-End Live Demo at NAB 2026

In case you missed it, during NAB 2026, Cobalt Digital demonstrated an end-to-end implementation of RIST Satellite-Hybrid: In-Band Method (VSF TR-06-4 Part 7).

In the demonstration, Cobalt used a PACIFIC 9992-ENC encoder to add the backward-compatible TR-06-4 Part 7 markers to the outgoing transport stream. The stream was sent to a standard satellite modulator, whose output was connected to the award-winning (TVB Europe NAB Best of Show 2026) Cobalt PACIFIC ULL-DEC decoder equipped with a satellite demodulator (SAT-DEMOD) option. An emulator in the path introduced simulated data loss to reproduce the effects of rain fade. 

During the demonstration, Cobalt presented side by side views as a before and after comparison. One view showed the original received stream that displayed significant data corruption, and the second view showed the corrected stream with RIST using the Internet to recover lost or corrupted data. The difference between the two views was clearly visible, with the corrected stream showing no loss of quality.

The demonstration showed perfectly how the RIST Satellite-Hybrid: In-Band Method can be used by broadcasters to achieve the same reliability on Ku- and Ka-band as they achieve with C-band. You can see the demo in action here.

RIST Satellite-Hybrid Methods

The RIST Satellite-Hybrid: In-Band Method works by adding a small amount of data into the transmission before it is uplinked to the satellite, which enables any locations using the method to request any missing data be resent over the Internet using RIST. This method requires a small amount of additional data to be inserted into the transport stream before uplinking.

Alongside the In-Band Method, the Video Services Forum (VSF) has now also published a technical recommendation for the RIST Satellite-Hybrid: Out-of-Band Method. This method performs the same function as the In-Band Method allowing broadcasters to augment satellite distribution using the Internet as a recovery mechanism for data that is corrupted or lost in the space segment. However, with the Out-of-Band Method, no additional data needs to be inserted into the transport stream.

Additionally, the VSF has also developed a technical recommendation to meet the needs of users when there is already an IP link over satellite or other RF distribution channels. The RIST OTA-Hybrid: IP Transport Method can be used to augment any Over-The-Air (OTA) transport system that uses RTP as its primary delivery mechanism, by using the Internet as a recovery mechanism for data that is corrupted or lost in transit.

Ongoing Development

The RIST activity group continually works to enhance and further develop RIST specifications to include additional features. Watch this space for further developments!

For more information about RIST-enabled products, and to discover how they can benefit your operation, get in touch.