[mdlug] Curious - Phone Tapping Tech

[Michael Mol]

On Thu, Jun 21, 2012 at 1:32 PM, Aaron Kulkis <akulkis00 at gmail.com> wrote:
> 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.

That assumes the two halves of the pair are coaxial, which they're not.

-- 
:wq