How do cable lines on telephone poles transmit and receive data along thousands of houses and not get interference?
In: Engineering
I guess it depends on what sort of setup you are talking about. I am a telecommunications engineer in the UK.
How things are fed here is you get dial tone from the exchange in a pair of wires that are twisted together. The twists help resist any interference from other circuits.
These cables generally go to a street cabinet which, again generally speaking, will be close to your house.
At the green cabinet there is a DSLAM which is a box that had a fibre connection in it that your phone line runs through fibre ports which then when it comes out it has your dial tone and broadband service on it.
This is then on a pair of wires to your house via different connections. In your house you should have a micro filter which is really a splitter that splits the different frequencies the one you can hear for the phone and one that’s beyond your hearing range for broadband.
I have worked on lines that have a lot of cable above ground on poles and when using my test phone I can hear the radio on the line. But this can be filtered out by phone sockets.
TLDR. Basically from the exchange you have one pair of wires all they way to your house.
Having them twisted makes a big difference in reducing any interference.
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