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Question:

cable data speed? how fast it travels?

About how many seconds after a news reporter says something does your TV officially receive it with cable? As in how many seconds behind is your TV from when it actually happened?

Answer:

Electrons do trasfer with the speed of light. Except a few seconds delay from the source to your TV.
That depends on a lot of things, especially the route the signal takes from the camera to your TV. One would have to measure the delay to tell exactly what it is for that particular path. If the signal is purely analog (which is rare these days) the delay will be minimal. There will be some but it would not be easily noticeable. If the signal was sent over a satellite link, there is about a 2 second delay due to the distance involved. If the signal goes through any digital processing, there can be 1.5 to 3 seconds delay just for the encoding and decoding for each of the links. Trace the path of the signal and add up the delays. Three to five seconds on a network feed is not uncommon now days. Since you asked about cable, many cable systems are using digital encoders to provide digital cable. There is probably a 1.5 second delay or so just from that. That is on top of whatever delay was in the signal before it got to the cable company.

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