The Input Protection Module ( IPM ) relates to aprotection plug used in the telephone exchanges to protect the electronic exchanges from over voltage and over current. These plugs are used at the interface between the subscriber line and the exchange lines. This interface is called Main Distribution Frames (MDF).The protection of the electronic exchanges from over voltage and over current is ordinarily ensured by providing a GDT (Gas Discharge Tube) also called Arrester and a PTC
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