I worked in the DSS field for 5yrs and Having recently upgraded a "Digital Cable System" of a competitor whose territory was recently aquired, I will say that all Cable systems are not equal, but neither are all DSS systems.
The digital cable I work with runs @ 1Ghz not 600mhz, and the mhz has to do with the amount of DATA able to be xfered not a clock speed as Dan has so wonderfully pointed out.
As for your Dolby Digital, Coax-Digital would seem to be the only option at this point unless Pioneer/Scientific Atlanta, Jerrold, and General Instrument are not telling us something. But curiosly were would your optic-TOS feed come from? Certainly you would not want Fiber-optic run into your home Currently that would be the only way to give you an optical-TOS output. Does any one know of a DSS that provides a opt-TOS output?
On most decent digital services you will find digital re-transmissions of those channels that are avilible to the Cable provider in digital on your Digital service and analog on those that are not avilible via digital transmissions or on your cable ready sets.
