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E N G I N E E R I N G |
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| FAQ |
Motorola HD Cable STB Info Pages |
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Decoders This section deals with the decoder portion of the DCT. The Motorola DCT series of Digital Television Decoders, is designed to decode ONLY digital signals sent by local Cable Companies. These digital signals are modulated using a technique called QAM (Quadrature Amplitude Modulation), this modulation technique is used because its easier & a more robust way for cable companies to send data. Using different levels of QAM allows for more data to be passed through a single 6 MHz channel allocation normally used for 1 analog television channel. Here are the current maximum data rates for common methods of digital modulation:
Integrated Television Decoders
There are some TV manufactures that have started integrating QAM decoders into their TV’s.
Depending on how your local cable company is sending out their digital channels (encrypted or not), depends on whether or not your TV can see the signals & decode them.
In the next year or so, conditional access for premium channels will also make it into HDTV's; Panasonic & RCA, along with others, have signed on to make this happen. This will allow you to connect the cable directly to your "integrated" TV and watch HDTV from the Cable Co.
Scientific Atlanta Markets
Most Cable Companies have chosen to use either Motorola and/or Scientific Atlanta STB's in their respective cable systems. They usually scatter the use of these boxes throughout the region. This is probably done just to keep the STB manufactures' honest. But they are not interchangeable within the systems. Motorola DCT's cannot be used in SA markets & vice-versa.
For more info on the Scientific Atlanta line of STB's please visit their website www.sciatl.com. There will also be similar information on these boxes on this website also, check back later for more info.
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