Phone line protection or network protection

If you must realize a PROTECTION, AC-safe is your starting point.
In fact it is a circuit where it is possible to experience several types of protection. You will have the possibility to protect the telephone line, therefore the apparatuses connected to it (modem etc.), from lightnings and the extracurrents, or with opportune modifications you will be able "to filter" disturbs on the electrical power 230Vac.