This invention relates to a telecommunication switch and an operating method for handling SDH signals transmitted by a protection SDH link associated to a working SDH link of a SDH hardware interface of the telecommunication switch. The non-volatile memory cell is formed by a FET transistor having a control gate, a first diffusion defining a first input and a second diffusion defining a second input. The sensing element portion may be disposed in a first column between a first pixel column and a second pixel column, and senses a touch. A via connection connects one end of the first set of turns of the primary winding to the second turns of the primary winding located on the second metallization layer.