Unit 9 Assignment

In an FDMA-based multiple access system, each user is assigned an 80 kHz channel for full-duplex communication. There are 1000 channels in total in the system.Depending on the information given in Yukon, if the starting frequency of the frequency spectrum used by the FMDA system in one direction is 1000 MHz, the carrier frequency of the channel belonging to the first user is 1.000.040 Khz.ATrueBWrong

In time the use of the ________ became the more desirable approach because an important parameter of the equivalent circuit was determined by the actual operating conditions rather than using a data sheet value that in some cases could be quite different. a.hybrid b.hybrid-pi c.re d.pi

* You have been asked to create a subnet that supports 16 hosts. What subnet mask ?should you use .255.255.255.252 • 255.255.255.224 .255.255.255.240 • 255.255.255.248 * ?How does a switch differ from a hub • A switch does not induce any latency into the frame transfer time. • A switch decreases the number of broadcast domains. • A switch operates at a lower, more efficient layer of the OSI model. . switch tracks MAC addresses of directly- connected devices. Which OSI layer header contains the address of a destination host that is on ?another network • Network

Q.6. ABC organization wants to manage its four offices A, B, C and D. This organization has network information (200.20.110.0-200 20.110.255). For each subnet find subnet mask, network ID, first assignable IP, last assignable IP, and broadcast addresses. (Show IP Addresses in decimal as well as in binary) Answer

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!

Messages are sent over a communications channel using two different signals. One signal requires 2 microseconds for transmittal, and the other signal requires 3 microseconds for transmittal. Each signal of a message is followed immediately by the next signal. The recurrence relation for "the number of different signals that can be sent in "n" microseconds" is: Seç. Seç. Using the iterative method (you compute each step by hand) calculate how many different messages S(n) = S(n-1)+S(n-2)+ S(n-3) can be sent in 7 microseconds? (take the initial conditions of the recurrence relation as: So = 0 and S1 8. = 1, S2 = 1) 3 4 S(n) = S(n-2)+ S(n-3) 7 6. S(n) = S(n-2)- S(n-3)

1. Suppose two hosts A and B are connected via a router R. The A-R link has infinite bandwidth; the R-B link can send one packet per second. R's queue is infinite. Load is to be measured as the number of packets per second sent from A to R. Sketch the curves for throughput and delay, each as a function of load.

1) Assume that a circular cell has 57 channels and a cell radius of 10 km. The transmit power of the base station in this cell is 32 W. The path loss exponent in this cell is assumed to be 4. The grade of service is established to w be a probability of blocking of 5% (assuming blocked calls are cleared). Assume the average call length is two minutes, and each user averages two calls per hour. Further, assume the cell has just reached its maximum w m w m m capacity and must be split into four new microcells to provide four times the capacity in the same area. a) What is the curent user capacity of this cell? wwwm ww m w b) What is the radius and transmit power of the new cells? wwwwww wwwwwm www wwwwwwwwg vwww c) How many channels are needed in each of the new cells to maintain frequency reuse stability in the system? d) If traffic is uniformly distributed, what is the new traffic carried by each new cell? Will the probability of wwwww vww m vww vwwwww wv wwww wwww www wwm w blocking in…

SRAM uses RAS and CAS control lines.  True  False

Messages are sent over a communications channel using two different signals. One signal requires 1 microseconds for transmittal, and the other signal requires 3 microseconds for transmittal. Each signal of a message is followed immediately by the next signal. The recurrence relation for "the number of different signals that can be Seç. sent in "n" microseconds" is: Using the iterative method (you compute each step by hand) calculate how many different messages can be sent in 6 microseconds? (take the initial conditions of the recurrence relation as: So = 1 and S, = 1, S2 = 1) Seç. Sonraki sayfa in buraya yazın My Questions | ba... in Final Exam (page. Zoom

Why SSB is preferred for transmission of good quality signal

Consider the figure below for a real-time transmission. There are three packets to be played where first, second and third packets contain 12, 13 and 14 seconds of data, respectively. What is the units played for the second packet at time 28? Server Client Internet 00.00.01 00.00.00 First packet 00.00.04 00.00.12 00.00.14 00.00.16 Second packet 00.00.25 00.00.28 00.00.42 00.00.29 Third packet 00.00.39 00.00.43 Flow Play time Arrive time Send time Select one: a.0 b.12 c.14 d.1 e.10

Photos - Screenshot (46).png 72% / Fullscreen 1.The term SMA represents. 2.F type connectors are used in CCTV systems [True/False]. 3.RG 59 coaxial cable is 10base 5 coaxial cable. [True/False] 4.The segment length for RG11coaxial cable in SAT TV is 5.The segment length for twisted pair cable is 6.UHF connectors are used in public address systems [True/False]. 7.RG 58 thin coaxial cable is 10base 5 coaxial cable. [True/False] 8.The segment length for coaxial cable is 9.The segment length for fiber optic cable is 10.In fiber optics type of signal flows. 10:09 13/12/2021

Consider the queuing delay in a router buffer, where the packet experiences a delay as it waits to be transmitted onto the link. The length of the queuing delay of a specific packet will depend on the number of earlier-arriving packets that are queued and waiting for transmission onto the link. If the queue is empty and no other packet is currently being transmitted, then the packet's queuing delay will be zero. On the other hand, if the traffic is heavy and many other packets are also waiting to be transmitted, the queuing delay will be long. Assume a constant transmission rate of R = 600,000 bps, a constant packet-length L = 6,000 bits, and a is the average rate of packets/second. Traffic intensity I = La/R, and the Queuing delay is calculated as I(L/R)(1-1) for I< 1. Assuming that a = 24, what is the Queuing delay? Give your answer in milli seconds. Average queuing delay La/R 1

Modulation index is called elasticity of modulation when it is expressed as a percentage. True False

a) i. Distinguish between circuit and packet switching in communication system.     a) ii.  State two advantages and disadvantages of a circuit switching technique. a) iiiHow are messages or data in a packet switching techniques are routed to their destination. b) i. What are the modes of propagation in transmission  system? b) ii.  With the aid of sketch discuss one of the modes. What are the diversity techniques available in transmission network and discuss any two?

Explain why NRZ coding is not attractive for signal transmission applications?! Short answer please

Consider a cellular system in which an average call lasts 2 minutes, and the probability of blocking is to be more than 1%. Assume that every subscriber makes one call per hour, on average. If there is a total of 395 traffic channels for a seven cell reuse system (assume that blocked calls are cleared) Find the traffic intensity and the average calling rate of this unsectored system. Find the average calling rate and corresponding change in these rates compared to the unsectored case if (1) 120 degrees sectors and; (11) 60 degrees sectors are used. Comment on your results.

Consider an LTI system.(Need only handwritten solution please otherwise downvote)

Discuss the sources of interference and noise in transmission media and how they can be minimized or eliminated.

W-CDMA requires a complete change of RF equipment at each base station. a) True b) False

A digital communication link consists of nine regenerative repeaters along with a receiver. Signal from the transmitter is BPSK and regenerative repeaters have a bit-error probability of 5 times 10 -8 . (a) Calculate the overall probability of error. (b) Calculate the overall probability of error if regenerative repeaters are replaced by repeater amplifiers.   Please solve as soon as possible..I`ll surely give a big like.

B. Why VSB modulation is used in TV picture transmission?

Q#4: a. What is meant by interpolation? b. Explain the voice to digital and digital to voice conversion used in GSM?

(b) In a particular implementation of ADSL2+, 400 downstream subchannels are being used to achieve a data rate of 10.4 Mbit s-1. If 75 subchannels are using 1024-QAM, 125 are using 64-QAM and 100 are using 16-QAM, what modulation scheme must the remaining channels use, assuming they all use the same scheme? Show all your workings

Question 3 a. i. Discuss the key performance indicators in data communication that stimulate network performance measures. ii. 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.

A. Given a fixed route and fixed link types between two end systems, which of the following delays may vary depending on the level of congestion in the network? Select one: a. processing delay b. propagation delay c. transmission delay d. queueing delay ============================= B. Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are R1 and R2, respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L? (ignore queuing, propagation, and processing delays) Select one: a. L/(R1+R2) b. (R1+R2)/L c. L/R1+L/R2 d. 2∗(L/R1)

The effect of the CD level is not significant in the choice of a line code. true or false

Higher bit rates can be achieved over voice grade line by employing M-ary modulation schemes TRUE FALSE

a)  Compute the call arrival rate in hours, given traffic intensity of 40 Erlang and mean holding time of 10 seconds. b) In a switching network the channel capacity was given as 5 and the traffic intensity of 3 Erlang. What will be the call Blocking of the switch.