(a(i))[2]
Explain what is meant by the term regeneration.
(a(ii))[2]
Explain why it is not possible to regenerate an analogue signal.
(b(i))[2]
Digital signals travel through an optic fibre by means of infra-red radiation. The continuous length of the optic fibre is $58\,\text{km}$. The noise level at the receiver at the end of the optic fibre is $0.38\,\mu\text{W}$. The least acceptable signal-to-noise ratio at the receiver is $32\,\text{dB}$. Calculate the minimum acceptable power $P_{\text{MIN}}$ of the signal at the receiver.
(b(ii))[2]
The power of the signal entering the optic fibre is $9.5\,\text{mW}$. The output power is $P_{\text{MIN}}$. Calculate the attenuation per unit length of the optic fibre.