Abstract: An adaptive unit that taps into an existing POTS line, DLC POTS line, DLC channel unit designed for sealing current outputs, or AC-DC transformer designed for sealing current output, to provide sealing current to a DSL circuit thereby avoiding having to deploy a separate sealing current unit to supply the desired sealing current to the DSL circuit. The adaptive unit, or sealing current derivation device, is preferably deployed at remote terminals thereby facilitating the offering of new DSL service, but may also be utilized in a central office.