wk1 assignment

(i) Below (figure 1) is an example of a VHDL code for a multiplexer. --multiplexer.vhd --Common Multiplexer LIBRARY ieee; USE ieee.std_logic_1164.ALL; ENTITY multiplexer IS PORT(el, d3, d2, d1, d0 : IN STD_LOGIC; a,b.c,d,e,f.g.h.ij.k,lm,n:OUT STD LOGIC); END multiplexer; ARCHITECTURE mult OF multiplexer IS SIGNAL input : STD LOGIC_VECTOR (4 downto 0); SIGNAL output : STD LOGIC_VECTOR (13 downto 0); BEGIN input ca el & d3 & d2 & d1 & d0; WITH input SELECT "00000010000001"WHEN "10000",--Input A "00000010000001"WHEN "10001",- "00000010000001"WHEN "10010",- "00000010000001"WHEN "10011",- "00000011001111"WHEN "10100" "00000011001111"WHEN "10101 "00000011001111"WHEN "10110" "00000011001111"WHEN "10111" "10011110000001"WHEN "11000" "10011110000001"WHEN "11001" "10011110000001"WHEN "11010, "10011110000001"WHEN "11011" "10011111001111"WHEN "11100" "100111110011i1"WHEN "11101",- "10011111001111"WHEN "11110",-- "10011111001111"WHEN "11111":-. "00000010000001" -00 --"00000011001111"-01…

Suppose that 1’s complement is the checksum scheme for UDP   b) Assume that Host X sends the data block above to Host Y usingUDPand the data issomehow altered during the transmission, but Host Y finds no error after verifying thechecksum. How could this happen?

(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

SRAM uses RAS and CAS control lines.  True  False

. The following is configured on a router             Router(config)# interface g0/0.10             Router(config-subif)# encapsulation dot1Q 20             Router(config-subif)# ip address 192.168.30.1 255.255.255.0 A packet is sent from the router out the subinterface to a trunk port on a switch. The switch will treat the packet as if it is on what VLAN? . The following is configured on a router             Router(config)# interface g0/0.10             Router(config-subif)# encapsulation dot1Q 20             Router(config-subif)# ip address 192.168.30.1 255.255.255.0 A packet is sent from the router out the subinterface to a trunk port on a switch. The switch will treat the packet as if it is on what VLAN? VLAN 20 VLAN 30 VLAN 10 The native VLAN

a.) Determine the generator function in vector notation. b.) Determine the message polynomial if m = [1101]. c.) Determine the codeword given m = [1101].  d.) Determine the syndrome if r = [110111].  e.) If the cyclic code will be implemented using the shift registers, determine the state equations of the next state. S0(t+1) = ? f.) If the cyclic code will be implemented using the shift registers, determine the state equations of the next state. S2(t+1) = ?

1.1 Simplify the Boolean expression below using De Morgan's theorem Not{Not((XYZ)'(ABC)') + Not((EFG)'(JKL)')} Filters Add a caption...

WR* = 1 for an I/O read bus operation.  True  False

Q. A code 101101 needs to be sent to the recirer. using, hamming code find mechauišm out the code - cword and the to check the corrected olata cohen occured at 4 th conssuming Right to left coith odd pority.

Given that the base address is FoH. 1. Create a new asm project “Lab2_Q1.asm". Assume that port A of 8255A PPI is connected to 8085. Write assembly code to send the value of FFH to FoH. Enter a delay of 2 ms for each transmission.

16.A. A glass fiber weighs ________ a copper conductor.A. twice as much asB. considerably more thanC. the same asD. considerably less than16.B. Which source allows an increase in data rates through parallel transmission?A. Fabry-Perot LaserB. VCSELC. DFB laserD. LED

2:38 docs.google.com A In register indexed addressing mode, the - effective address is given by the sum of the index register value and displacement. difference of the index register value and displacement. index register value. O The Data bus is - a group of bidirectional 20 lines. a group of bidirectional 16 lines. a group of unidirectional 20 lines. Indicate the result of SAR BL, CL, if CL=4- and BX=FOE2H FFFEH FFE2H FOFEH Indicate the rSSuIEOFCMP DH, AL , if-

1: An example of MISD system is_____ Select one: a. Array Processor b. SMP system c Vector Processor d. No example exists of such a system.   2:VDTS belong to______category of external devices. Select one: a. Peripheral b. Human readable c Communication d. Machine readable

Netid 73:common in all addresses 73.0.0.8 73.22.17.25 73.0.0.1 73.255.255.254 Block 73.0.0.0 73 255 255 255 Switch Network address: 73.0.0.0/8 73.255.255.255 (Special) (H.W) An address in a block is given as 180.8.17.9. Find the number of addresses in the block, the first address, and the last address.

Consider constellation plot of a B-PSK signalling scheme as shown in the figure below: S2₂(t) -1×10-3 $2(t) S₁(t) 1×10-³ $1(t) $1(t) and 2(t) represent ortho normal basis functions. If the two sided PSD of AWGN is 10-6W/Hz, then the probability of error 'Pe' is

Give the Answers of following questions, 1: without reducing implement the following Boolean expression using basic gatesY Y= (A' B)'+A+BC   2: Reduce the following Boolean expression using Boolean algebra. Y = (A+BC)' (AB'+ (ABC)')   3: Explain the construction and working of the Depletion MOSFET, with characteristics curve.

Refer to the VHDL code given below, which of the following line has error? Line 1: SUBTYPE my_logic IS STD_LOGIC RANGE '0' TO '1'; Line 2: SIGNAL a: BIT; Line 3: SIGNAL b: STD_LOGIC; Line 4: b<=a; Line 3 Line 2 Line 1 Line 4

Given the data stream 00101110, sketch the transmitted sequence of pulses for each of the following line codes: a. Unipolar NRZ b. Bipolar RZ C. Manchester code

Q6// Draw the block diagram and make a truth table according to this VHDL code. ENTITY black box IS PORT (a, b, cin: IN BIT; sl, s2: OUT BIT); END black_box; ARCHITECTURE dataflow OF black_box IS BEGIN sla XOR b XOR cin; $2 <= (a AND b) OR (a AND cin) OR (b AND cin); END dataflow;

(c) Write a VHDL code to implement the above counter using conditional statement "case". You need not necessarily use a synchronous load mechanism.

Q4/ The decimal 793.251)= ( number 1431.204 number ( O 1431.200 O No one of them 1341.200 O 1341.201 ) in octal

Chosse correct answers:For a binary symmetric channel, the random bits are given as :Logic 1 given by probability P2 and logic 0 by 1-PLogic 1 given by probability P and logic 0 by (1-P)Logic 1 given by probability P and logic 0 by (1-P)2Logic 1 given by probability 1-P and logic 0 by P The self information of random variable is :00.5None of the mentioned1Which technique is called on-off keying :PCMASKFSKDMThe channel capacity equation refer to :The channel is optimisedNon of the aboveThe channel is noisyThe channel is lossyIn Delta Modulation, the bit rate is :N/2 times the nyquist criteriaN times the nyquist criteriaN times the modulating frequencyN times the sampling frequency How many bits are needed for standard encoding if the size of the character set is X? :x+1log X2XX2The last Pulse Code Modulation stage is :SamplingADCModulatingEncoding

PART I- PULSE MODULATION a. In your own words, explain the importance of line coder in digital communication. b. In telecommunication, a line code is a pattern of voltage, current, or photons used to represent digital data transmitted down a transmission line. Assuming that you are about to send a set of bit string: 1000 1001 1101 0110 down to the transmission line, illustrate the resulted coded signal after it went through line coder using bi-phase M code formats.

* 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

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

Draw the graphs of the Manchester, differential Manchester, NRZ-I and NRZ-L schemes for each of the following data streams: 00110011 10101010

QUESTION 4 a. In your own words, explain the term companding used in telecommunications the important of that process. b. In telecommunication, a line code is a pattern of voltage, current, or photons used to represent digital data transmitted down a transmission line. Assuming that you are about to send a set of bit string: 1000 1001 1101 0110 down to the transmission line, illustrate the resulted coded signal after it went through line coder using differential Manchester code formats.

(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

Q6. (a) Consider a (7, 4) cyclic code with generator matrix g(x) = 1+x + x³, find the data word sent if the sequence is received (1100011). (b) For single-error correcting code with 7 data bits, find how many check bits are required.

a. Convert the following numbers to the required radix: (122)s to Bin; (67)16 to Oct; (37)10 to BCD; (13.23)16 to Bin. b. Perform the following arithmetic:- i. (10001001)2 – (10000001)2 using 2's and 1's complement; ii. (11011011), * (00000001)2