$18.$Final ExamInstructor. Dr$.$LtA telephone line normally has a bandwidth of $3$KHz$.$ Suppose it is used to transmit a digital signal with $16$ levels. $(8$ points$)($a$)$ what is the maximum bit rate of this line?$($b$)$ In a normal operating condition, the signal$-$to$-$noise ratio on telephone line is usually $3162.$ What is the Shannon capacity of this line?