how does digial cable work?

Question

how is the signal sent through the physical cable? is it just binary "square" waves, or can more then one signal be sent through the cable? i've heard of different frequencies being sent all at once and was wondering if thats right or how that works?

Answer 1

the information is quantized, that is, it is assigned some voltage values and then it is modulated, for that modulation there are several techniques with different frequencies intervales. in the case of cable, the channel that is used to send the information is the optical fiber, so u use a transductor from voltage to light and then at the receiver u have a transducter that does the opposite. the receiver is usually the nearest cable station to ur house, so, actually the optical fiber doesn't go to your house, i'll bet u have a coaxial cable that goes up to the decoder. if u don't have a decoder (actually i'm not from the U.S. so i don't really know if the system is the same, but it must be a lot alike) the cable goes directly to your tv, it means it wasn't codified and it is easier for your neighbors to steal your cable system. and then your tv has a system to convert this voltage signal to the images u see, and that's about it!

Answer 2

In any form of digital transmission, the signal to be transmitted is converted to a numerical code, and these "numbers" are sent by some form of modulation. Digital transmission does not inherently take less bandwidth than analog; in fact it takes more. However, a digital signal can be compressed (redundant information removed) so that it is often possible to send more information digitally (within a given bandwidth) than in the analog form.

Answer 3

In any form of digital transmission, the signal to be transmitted is converted to a numerical code, and these "numbers" are sent by some form of modulation. Digital transmission does not inherently take less bandwidth than analog; in fact it takes more. However, a digital signal can be compressed (redundant information removed) so that it is often possible to send more information digitally (within a given bandwidth) than in the analog form.

Also, it is possible to add redundant information to digital signals to detect and correct errors in transmission.

Answer 4

Imagine your television picture is a jigsaw puzzle broken down into individual pieces, placed in a box, shipped to its final location and put back together again exactly as it was before. That is essentially how digital cable works. And because the picture takes up less space in digital pieces, many more channels can fit through the existing cable system in your town.

Answer 5

IT'S REALLY KIND OF SIMPLE.{ASSUMING YOU ACCESS TO THAT MIRACLE CALLED ELECTRICITY.LIKE ANY OTHER CABLE{T.V.}YOU SIMPLY PLUG IT INTO YOUR SET/DVD/TIVO AND PLUG IT INTO YOU DISH-BOX. ASSUMING ONCE AGAIN, YOU FOLLOWED INSTRUCTIONS, YOUR DIGITAL CABLE SHOULD WORK.

Answer 6

it works fine, just fine thank you