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Cable questions

H

HypNoTic

Member
I was wondering,

Considering a TV is using coax cable and have only one wire in it & all the signals from all the TV stations are broadcasted over differents frequencys and are called channels.

- I think that when you were changing of channel, the end-user TV was simply selecting the good frequency, right ?
- Therefore, how a cable distributor can know which channel you are looking at ?
- And how they can lock a channel just for you since the signals are broadcasted over the whole district ???

- Cable modem (for Internet) are half-duplex devices but when watch TV and surf the Web, you receive TV stream while uploading data to the Internet, so its no longer half-duplex but full-duplex ???
 
the TV signals are scrambled and broadcasted. They descramble for you when you subscribe to certain channels.
 
yeah, but the descrambling is done locally, on the cable end just before it enter my house or at the provider's end ??

sorry, i still dont understand 🙁
 
It is two wires; the shield serves as ground.

Each unit has unique Hardware Code.

When you are entitled to a certain signal their computer insert the code to the general Signal, when it get to you your system it matches your hardware code and can be unscramble.
 
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