what's the bit rate?

Pete W‭ i don't know if it is needed thats why i am asking.I dont have a clue on what "bandwidth of the signal" means here.

anyway, an analog BW of 2kHz would be totally inadequate for actual bit rates you are likely to find. At least in "typical" serial port uses. Analog BW would typicall mean frequency beyond which the amplitude of a sine sweep test signal comes out attenuated to below -3dB. In frequency units, it needs to be well in excess of the bits-per-second, so that the levels and timing of the edges are reproduced with acceptable margin. The bit rate will be defined by your application, that is usually the starting point.

Yes the question is theoretical I want to understand what bandwidth of the signal means.