2- The specification of two telephone links are Link Class 1 B 300-3400 Hz SNR 40 dB Class 2 600-2800 Hz 30 dB A company has a requirement to send data over a telephone link at bit rate R= 20 Kbps without error. Would you advise the company to rent the more expensive class 1 service, or the cheaper class 2 service? Justify your decision.

i. Draw the circuit in the figure below. Complete connection for making seven segment decoder and write the truth table of BCD to seven segment display. VCC T CONNECTION DIAGRAM DIP (TOP VIEW) 1 CC Vcc 15 7447 _1_2_3_4_5_8_7_8 в с LT BI/RBO RBI DA GND GND = d e с g 2000 CA b D -b a CA

* 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

Suppose that the circuit shown in the below figure is to be modeled. What is the correct VHDL option for the synthesis of this circuit? global_resetb zb- global cik a

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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.

Decoder circuit as shown in the following Figure. if A is LSB and C is MSB, the output expression F= YO Y Y, Y, D. Y. Decoder O a. B' O b. C O'c.B O d. C

Suppose that a speech signal is A/D and D/A converted four times in traversing a tele-phone network that contains analog and digital switches. What is the SNR of the speech signal after the fourth D/A conversion?

Given a 2x4 decoder. If i1i0 = 10, then y3 = ?

3. Some GPS receivers use 1 bit ADCS (Analog-to-digital Converters) to sample and quantize the signal i.e. the output of the ADC is simply 2 quantization levels: -1 or +1. This is typically done to save on power. (a) What is the quantization SNR? How does it compare to typical thermal noise SNR of a GPS signal before correlating with the CDMA code? (b) Justify, how come it is possible to sample the signal using a single bit and still get good performance.