The invention concerns a method of providing an improved call forwarding service in a telecommunications network, and a network unit and a computer program product to execute this method. An absorbent 52 having a function of absorbing HC components and NOx components contained in exhaust gas is provided in the first bypass passage 46. With regard to the paths selected by the path selector circuit 10, a difference metric obtained by a difference metric calculator circuit 9 is statistically processed by a \u03bc- and \u03c3-calculator circuit 13 to calculate a bit error rate. The DATRM selectively shapes raw driver torque request into a final driver torque request. Another type of memory includes a physical page of cells, a sensing mechanism and a selection mechanism.