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Demodulation of encrypted channels

The use of encryption systems is widely spread in digital pay television. the operator encodes the signals and the subscriber holds a Smart Card Giving access to those channels. The main limitation with this kind of solution is that each receiver specialises in a specific encryption system and can not be used for another system.

There is one alternative known as “Common Interface” which allows the use of standard receivers. In this case the receiver has a slot to insert various coditional access modules (CAM) and their corresponding Smart Cards. This lets the user access the digital television content of various providers, even if they use different encryption systems.

PROMAX holds a patent over the use of “common interface” in test equipment.

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.