[mdlug] Curious - Phone Tapping Tech

[Aaron Kulkis]

Robert Adkins II wrote:
> I am curious to know if phone tapping technology has "caught up" with
> Holywood. In terms of being able to take a band and wrap it around a bundle
> of phone lines and call that a tapped line.
>  

No.  Kirchoff's Current Law makes this impossible.

Every current travelling "outbound" on one wire of a twisted pair
has an equal and opposite "inbound" current on the other half of the pair,
making the net current going through the loop = Zero, and therefore, no
way to detect ANYTHING  within the cable bundle.

> I'm curious, because everything that I know regarding this technology
> requires that each individual line be physically tapped/connected to in
> order to obtain anything.
>  
> I'm talking about Plain Old Telephone Service. Nothing fancy like IP based
> or similar.
>  
> Also, there's a guy, selling services, suggesting otherwise.
>  
> Thank you.
>  
> Regards,
> Rob
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