Q: What is the main role of IPQAM in interactive digital TV systems? What is the role of IPQAM's Region Code information (Region ID)? Why can't use the IPQAM technology solution for interactive digital TV deployment when I use the 1550nm optical transmitter and optical amplifier in the extension room of the cable TV network?

A: The main function of IPQAM modulator, which can input the request program stream transmitted from IP backbone network into the specified IPQAM, and reuse it into the designated multi-service transmission stream. Then QAM modulation and frequency conversion are carried out. The output radio frequency signal is transmitted in HFC network for receiving by interactive set-top boxes of home users, whose interactive set-top boxes demodulate the requested program.

In interactive digital TV, IPQAM region code information (Region ID) plays the role of interactive set-top box location, that is, when STB requests service, it needs to submit this information to CDN. Head-end system can be distinguish which set-top box requests from which region, and assign the corresponding routing for video server to transmit video data stream.

When all the extension rooms of CATV network use 1550 nm optical transmitter and optical amplifier, IPQAM can not be used when all the extension rooms of CATV network use 1550 nm optical transmitter and optical amplifier, because one IPQAM can carry limited interactive users, and each 1550 nm optical transmitter covers more users, so it is more difficult to realize spatial multiplexing of multiple IPQAMs in the extension room of CATV network, because IPQAM can not be used when all the extension rooms of CATV network use 1550 nm optical transmitter and optical amplifier. The technical scheme is deployed for interactive digital TV.

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Dibview IPEdge QAM Modulator can be widely used for cable digital television broadcasting and VOD system.