Measuring and decoding DVB-S2 multistreams

January 22, 2014.

Advanced modulation techniques allow you to aggregate several independent transport streams into one single RF carrier. Selecting a specific transport stream is easy with your field strength meter RANGERNeo 2 using the ISI Filtering function. This feature is available for DVB-S2, T2 and C2.

What is the multistream technology?

As part of the GSE (Generic Stream Encapsulation) protocol adopted in DVB-S2, DVB-C2 and DVB-T2 standards it is possible to aggregate independent transport streams into one single radiofrequency carrier that is commonly referred to as multistream. Each individual transport stream is identified by its ISI (Input Stream Identifier) and can be recovered transparently on the receiver side.

Example of a multistream transponder (Eutelsat 12.5ºW 12.718 MHz H/H)

It is now possible to measure and decode multistream channels with field strength meter RANGERNeo 2. In order to do so the ISI FILTERING must be enabled under the signal parameters menu of the analyser as shown on the picture below.

ISI filtering is disabled

ISI filtering is now enabled

We can then enter a specific stream identifier that will be used by the field strength meter to recover the corresponding transport stream, service list and programmes data.

Signal parameters of the
current DVB-S2 multiplex

Selecting a service from the current
DVB-S2 multiplex

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PROMAX is a leading manufacturer of test and measurement systems, broadcast and TV signal distribution equipment. Our product lines include measuring instruments for cable TV, satellite TV, broadcast, wireless and fibre optics networks, FTTH and GPON analyzers. DVB-T modulators, IP streamers or IP converters (ASI, DVB-T) are among the company’s latest developments.