A cutting tool used for grooving and turning operations, where a cutting insert is removably securable in a blade-shaped insert holder. An inflow conduit for fuel formed in both valve body parts passes through the contact faces, and a high fuel pressure prevails in it. Code multiplexing techniques are employed inventively to convey information for up to fifteen FL carriers on a single, standard CDMA channel designed to provide such signaling for only a single FL carrier at a time.