How do cable lines on telephone poles transmit and receive data along thousands of houses and not get interference?
In: Engineering
Cable and telephone protect against interference in different ways. Telephone lines use twisted wire. The twists of the wire pairs block outside interference and help propogate a signal further. Than if it were untwisted.
Cable/coax cables run on a single copper conductor, surrounded by a dialectic medium and protected by aluminum shielding.
Both are limited by a rate/reach issue… The higher the frequency/data rate, the lower the distance. 128 kbps (very slow) dsl can go about 20 thousand feet, while a 100 Mbps dsl connection goes about 1000 ft max. Each home has an individual coax wire or twisted pair ran to it.
The cable/telephone company runs fiber to distribution locations and uses equipment (DSLAM in the case of DSL) to put the signal onto the copper wire to make the last mile connection… So in the case of them suddenly offering higher speed, it means they’ve ran a new DSLAM or fiber node closer to your home.
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