Chapter 4, Problem 3E

Explanation of Solution

To determine the Transmission Rate Of Information Bits (TRIB):

Given,

Character information:

Information bits (K) = 8bits

Parity bits = 1bit

Block information:

Total characters (M) = 1000 character per frame

Control characters (C) = 20 characters per frame

Error rate (P) = 1% = $\frac{1}{100}$ = 0.01

Time information:

Turn around time (T) = 30ms = $\frac{30}{1000}$ = 0.03sec

$\begin{array}{c}Transmissionrate(R)=56kbps=56,000bitsper\sec ond\\ =56,000bitsper\sec ond\times \frac{1char}{informationbits+paritybits}\end{array}$

Explanation of Solution

To determine the TRIB if half-second delay is added to the turnaround time:

Given,

Character information:

Information bits (K) = 8bits

Parity bits = 1bit

Block information:

Total characters (M) = 1000 character per frame

Control characters (C) = 20 characters per frame

Error rate (P) = 1% = $\frac{1}{100}$ = 0.01

Time information:

$\begin{array}{c}\text{Turn}\text{around}\text{time}\text{=}\text{30ms}\text{+}\text{0}\text{.5sec}\\ \text{=}\frac{\text{30}}{\text{100}}\text{+}\text{0}\text{.5}\\ \text{=}\text{0}\text{.03}\text{+}\text{0}\text{.5}\\ \text{=}\text{0}\text{.53}\end{array}$

$\begin{array}{c}Transmissionrate(R)=56kbps=56,000bitsper\sec ond\\ =56,000bitsper\sec ond\times \frac{1char}{information}\end{array}$