for Baber Makayla

IT200 Homework #2

20 points

NAME: __Robert J Bell______________________________________

Answer 4 questions from the following 6 questions:

1. What is the difference between a passive star and an active repeater in a fiber network?

A passive star has no electronics. The light from one fiber illuminates a number of others. An active repeater converts the optical signal to an electri- cal one for further processing

2. A laser beam 1 mm wide is aimed at a detector 1 mm wide 100m away on the roof of a building. How much of an angular diversion (in degrees) does the laser have to have before it misses the detector?

3. Is an oil pipeline a simplex system, a half-duplex system, a full-duplex system, or none of above? Full-duplex system

4. How many frequencies does a full-duplex QAM-64 modem use? Two frequencies are used, one for upstream and one for downstream. The modulation scheme itself just uses amplitude and phase. The frequency is not modulated.

5. What is the percent overhead on a T1 carrier; that is, what percent of the 1.544 Mbps are not delivered to the end user?

Binary Conversions The end users get 7 x 24 = 168 of the 193 bits in a frame.  The overhead is 25/193= 13%

· Convert the following decimal numbers into 8-bit binary. (1 point each)

        139

10001011

· 226 ------- 11100010

· Convert the following Binary IP Addresses into standard dot-decimal format. (1 point each)

· 00001011101011100111011001100100

· 10010000010101010100001111111111 _

· Convert the following binary address into MAC address hexadecimal (0x) format. (1 point)

· 00011011100110100111001011100011 1111010100010110

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