DSL filters can split telephone signals in two, but you cannot use them to descramble cable TV signals. Also, descrambling cable signals violates the law and requires a special set-top box.
Cable signals travel over coaxial cable lines. DSL filters only work on traditional telephone lines and split analog and digital signals. This filter splits signals so DSL does not interfere with other phone devices, such as fax machines, according to HomePhoneBrewing.
Descrambling a cable signal requires a special device called a cable descrambler -- or a "pirate box" -- according to ExpertLaw. These are legal to own, but illegal to sell.
While a cable descrambler does not automatically break any laws, if a technician sees you using one or a seller of descramblers gives your name to the police, you could face civil and criminal charges, according to ExpertLaw. Fines can climb as high as $10,000 and possibly more if the judge awards the cable company court costs.
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