is subdivided into a code 4 with spreading factor 128 reference c 4 u2032 and a code 68 with the spreading factor 128 reference c 68 fig1 shows a detail of a code tree diagram with three code classes with the spreading factors 64 128 and 256 respectively the code 32 relating to spreading factor 64 c 32 shown schematically in fig1 with dark shading and code 68 relating to spreading factor 128 c 68 are active when measuring the signal with the assistance of a signal analyser which presents each measured power level of the code channels relating to the spreading factor 64 the power level of the active code channel 32 is presented with an additional power level for the code channel 4 in this context the power level of the code channel 4 is a so called alias power level which also occurs with an inactive code channel 4 and originates from an actually active code channel 68 of the spreading factor 128 the code channel 4 of the spreading factor 128 however is actually inactive in the diagrams inactive code channels are represented by empty circles fig2 shows a presentation of the power levels of the individual code channels for the basic spreading factor 64 in this presentation as a bar diagram the individual code channels are plotted horizontally so that the height of the bars allocated to the individual code channels indicates.