It is technology which checks and manages the premium quality picture and sound at your home television. You are not required to purchase any kind of antenna or dish to avail channels and other features. It facilitates you in such a way that you purchase a whole package and your entire family gets entertained through this package.
Yes, as it entails a separate cable box for each number of TV sets. It would be very useful for you as you would be able to see the updated features like on-screen and PAY-PER-VIEW. You can also avail the option to visit HD channels on other TV sets but it won’t add the full channel lineup.
No, it is not mandatory to own a Digital TV to avail Digital cable channels. If you already have a digital box, it will definitely receive the digital signals. So, you don’t have any need to purchase Digital TV.