Usually cable companies will install a filter when the customer only purchases
the Internet service and not video.
There is a picture in the beginning of the thread... You have two traps,
a positive trap and a negative trap.
The positive trap was used mostly in the 80's and early 90's before the converter
boxes were widespread. The positive trap actually induced an unreadable frequency
into the cable line so that you could not get certain services (skinamax, hbo, disney... etc)
The converter boxes today are addressable, meaning that they can be controlled
and authorized through the cable company's office. All modern cable boxes have
mac addresses.
The negative trap is what they use today for some subscribers. It takes out a certain range of frequencies, such as the frequencies that the provider has
their video feed (basic cable). They do not slow the internetz down as one
said above... The negative traps block out the basic tier services for
internet customers only.
There are different types of negative traps... When a customer orders a very
basic package (such as only 15 channels or so) we use a trap that only allows
certain channels to come through..
As one poster stated earlier, everyone is connected to a hub (its actually a node).
There can be 100's of nodes depending on the size of the cable infrastructre and
how many neighborhoods it needs to serve.
Here is how the "signal" flows, the cable office or "headend" recieves programming (TV, Internet, Phone), then it leaves the headend, via fiber optic then
it hits the NODE which transfers the signal from Fiber to coax.
Verizon fios is very similar. They actually run the fiber to your house and
mount the node on the side of the house then converts the fiber signal to
coax...
TheMoreYouKnow.jpg
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