To prove your knowledge as transmission planning engineer in AIT telecom Unit, you are show that values of U which approaches one (1) brings about delay. Analyze this by a delay curve or graph. Choose values of U from 0.0 to 1.0 and D from 1 to 10.

Digital Subscriber Lines can not be implemented with loading coils for the reason that a. loading coils are heavy and tend to sag the line b. loading coils are not compatible with DSL repeaters c. loading coils are only good for short distances d. loading coils attenuates signals beyond the voiceband 2. Under the 1st generation of analog mobile phone systems, what is the frequency used for advance mobile phones?

Find out what causes the transmission delay and identify the contributing variables.

3. In an FM signal that modulating frequency is a 1.5-kHz sine wave. The carrier frequency is 1000 kHz. The frequencies of the third significant sidebands are ___ and ___ kHz.

In 8-bits digits, the number (+19) using the ______________ form is equivalent to: Arrive with the correct answers                                                        1.     signed magnitude number                                                            2. 1’s complement                                                          3.   2’s complement                                                          4.   summing it with (+1) A. 11101100 B. 11101101 C. 00010100 D. 00010011

(b) Figure Q.4b shows an Adder/Subtractor circuit implemented using Adder Q. The delay for XOR = 2t, OR = AND=1t and cascadable full adder is used for ripple carry adder. Assume inputs X, Y and ADDSUB have arrived at Ot. Analyze the critical path delay for the circuit if:- X[7.4] YI7.4] 4. A[3.0] A[3.0] lo"cle C4 C8 C4 Adder Q co C4 Adder Q co ADDSUB Sum(3.0] Sum[3.0] Z17.4] Figure Q.4b i. Adder Q is a 4-bit Ripple-Carry Adder. Show your analysis in Table Q.4b.i. ii. Adder Q is a 4-bit Carry-Lookahead Adder. Show your analysis in Table Q.4b.ii. Table Q.4b.i Table Q.4b.ii To Node Delay To Node Delay Z3 Z3 С4 С4 Z7 Z7 C8 C8 Page 14 of 21

Why SSB is preferred for transmission of good quality signal

Q4/ Why the performance of multimode graded index is better than multimode step index? Q5/ Design fiber optics communication system with analogue input and then measure the performance of the three types of fiber optics configurations. After that, answer the following questions: 1. Which configuration is the better? Comment! 2. Which parameters that improve the performance of multimode step index? Comment! 3. Which parameters that improve the performance of multimode graded index? Comment! 4. Which parameters that improve the performance of single mode step index? Comment! 5. If we need to increase the fiber length from 1 km to 15 km. which configuration is used? Comment!

a. Assume that a channel occupies a bandwidth of 250 kHz. We need to multiplex six channels with guard bands of 400 Hz using FDM. Calculate the minimum bandwidth of the link to prevent interference. b. Explain the analog carrier system used by telephone companies. c. Describe two other applications that use FDM other than analog carrier system. d. Four channels are multiplexed using TDM. Each creating 440 characters per second. The interleaved unit is two characters, and two synchronizing bits are added to each frame. Based on this information, find: The data rate of each source, i. ii. the frame rate, ii. the duration of each frame, and iv. the size of a frame in bits. v. the data rate of the link

The integer number given by the ratio of the frequency of a harmonic to the fundamental frequency is known as order of filter. True False