1. A digital signal processor (DSP) to execute at least one dedicated operation of a dedicated system (DFE-XDSL), characterized in that said digital signal processor is a flexible digital signal processor and comprises therefor: an arithmetic logical unit (ALU) that comprises a plurality of inputs (IN) to receive input data (DATA-IN); and a predefined interconnected plurality of basic operators (OP 1, OP 2, OP 3, OP 4, OP 5, OP 6, OP 7 ) coupled to said plurality of inputs (IN) for execution of a respective basic operation on said received input data (DATA-IN); and a plurality of control inputs (IN-CTRL) coupled between said predefined plurality of basic operators (OP 1, OP 2, OP 3, OP 4, OP 5, OP 6, OP 7 ) and a program controller (CTRL); and said program controller (CTRL) to activate via said plurality of control inputs (IN-CTRL), for at least one phase of a control program of said program controller (CTRL) and under control of an actual phase of said at least one phase, one or more basic operators (OP 1, OP 2, OP 3, OP 6 ) of said plurality of basic operators (OP 1, OP 2, OP 3, OP 4, OP 5, OP 6, OP 7 ) and to enable thereby said one or more basic operators (OP 1, OP 2, OP 3, OP 6 ) to execute its respective basic operation and to realize therewith at least part of a dedicated operation of said dedicated system (DFE-XDSL); and said arithmetic logical unit (ALU) further comprises a plurality of outputs (OUT) to receive, upon realization of each phase of said at least one phase of said control program, an output data (DATA-OUT) whereby said output data (DATA-OUT) represent a result of said execution of said at least one dedicated operation of said dedicated system (DFE-XDSL).