wireless test2

Q31)The bit rate for American PCM-24 system is a. 2.048 Mb/s b. 1.544 Mb/s c. 8 kb/s d. 64 kb/s   This multiple choice question from DIGITAL COMMUNICATIONS course.just write for me the final answer.

Q12: CSMA/CD is a protocol used in what Data Link Layer protocol? a. Polling b. Token Passing bus c. Token Passing ring d. Ethernet e. TDMA f. FDMA g. CDMA h. None of the above

Assume the baud rate equals bits per second. How long is a bit for a 9600 baud modem? A) 9600 B) 104 us C) 1.04 ns D) 9.6 ns

Two M-QAM modulation schemes, 16-QAM and 64-QAM, having equal error performance(i.e same value of Pbe). SNR=10 dB in 16-QAM system. Calculate the Eb/No in 64-QAM system. Compare the results.

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Question 9 only

Write VHDL code for a modulo-13 counter (counting sequence is 010, 110, …. 1210). The counter has the following features: a synchronous Active High Reset a value R can be loaded into the counter, using the signal Ld (Load) The signal Ld is active High Draw the schematic of your counter, showing the inputs and outputs. Show the number of bits for R, Q (output of the counter), Ld.

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middle 4 digit            letter    7 segment output           5206             EhJ             EhJ5206   print that specific combination using one  7 segment display in a serial. the following should be included in the report. 1-- truth table 2--circuit  =>general sop and pos =>simplified sop and pos =>using nand and nor gate =>using decoder  =>using multiplexer   3-- conclusion and discussion

3- If we increased 2 bits of the ADC quantizer, what is the improving in the SNR will be? Discussed your answer.

3. Which type of measurement should be used to ensure that a laser is working properly in a single-modefiber?A. Optical insertion lossb. Optical return lossc. Attenuation4. How many OC signals are combined into a 40 Gbps SONET network?A. 768 b. 192c. 256

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EEE

The operating point of a quadrature amplitude modulation QAM256 system is shown. This is a standard 8Mbps connection. At the operating point indicated on the graph with a big dot: a) In general, what is a bit error rate? 10-1, 10-2 10-3 b) Returning to this graph, how many errors happen at one second? 10-4 10-5 10-6 c) How many errors happen at one minute? 10-7L 10 20 30 40 SNR(dB) d) What is the signal to noise ratio in dB? e) What is the numerical value for the signal to noise ratio? f) If the noise level is 5micro watts, what is the signal level? BER

Q3. b) Suppose you want to transmit the 10-bit message [101101101] by Pulse code Modulation (PCM). Using clearly labeled diagrams, show the encoding the bit sequence using the following PCM waveform types: i) Bipolar RZ Signal ii) RZ-AMI iii) Bi – o - L iv) Delay modulation

•An ISP is granted a block of addresses starting with 190.100.0.0/16. The ISP needs to distribute these addresses to two groups of customers as follows: •The first group has 64 customers; each needs 128 IP addresses. •The third group has 128 customers; each needs 64 IP addresses. • Write at least the first and last IP addresses for the first two and last two customers in each group.

2. Digital signal is also compatible with multiplexing in what type? A. TDM B. FDM C. WDM D. All of the above

Q6: Sectoring is a way to do what? a. Achieve branch circuits. b. Put each phone call in a different time slot. c. Do SS7 look-ahead call placement. d. Partition Voice mail boxes e. It is an ISDN-PRI way of brining in trunks f. Achieve frequency reuse. g. None of the above

Write TRUE if the statement is correct but if it’s false, change the underlined word or groupof words to make the whole statement correct. The subject is basic electronics. please answer my questions. thanks

Which modulation scheme is used by Bluetooth? a) DQPSK b) MSK c) GFSK d) BPSK

This is a single question. Can yo send the solution.

solve part (iv), let the writing easy to read pls.. thanks

Convert (115.23) base 10 into BCD?

3. Explain disadvantages of ASK modulation system.