Why one cable line for both me and my neighbor

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@anon-e wrote:

I see one cable line going up on the outside line. There is a splitter between my neighbor (duplex) and mine but from one cable line. Does this mean we are sharing the Internet? 

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Are you having any connection issues or just curious ?

I had the same with a splitter. When I upgraded to Gigabit service mine was intermittent and wanted to take away any weak links. Found we were sharing 1 drop to the pedestal and worked with the tech to pull in 2 new lines to it. Now modem goes direct to pedestal through ground block outside.

Does this make the connection less secure? 

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@anon-e wrote:

Does this make the connection less secure? 

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As was stated earlier by .@ComcastAndrew, the answer is no. All signals are digitally encrypted.