Homework2 - environment, what media would you choose? Why?...

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IT 420 Homework #1 Key Listed below are representative samples of the homework 1 problems. Please bring any questions that you might have to class. 1. Given a transmit frequency of 500 MHz, how long would an antenna have to be to contain one complete cycle? cycle time (T) = 1 / frequency = 1 / (500 x 10 6 cycles/sec) = 2 x 10 -9 sec/cycle wavelength = T x V = (3 x 10 8 m/s) x (2 x 10 -9 sec) = .6 m 2. Given a transmit frequency of 200 KHz, how long would an antenna have to be to contain one complete cycle? cycle time (T) = 1 / (200 x 10 3 cycles/sec) = 5 x 10 -6 sec/cycle wavelength = T x V = (3 x 10 8 m/s) x (5 x 10 -6 sec) = 1500 m 4. How long does it take to send one complete cycle of a signal at 750 MHz? cycle time (T) = 1 / 750 x 10 3 cycles/sec = 1.33 x 10 -6 sec/cycle 7. What frequency is an antenna that is 10 meters long best tuned for? wavelength = T x V T = wavelength / V = (10 m) / (3 x 10 8 m/s) = 3.33 x 10 -8 sec frequency = 1 / T = 1 / (3.33 x 10 -8 sec) = 3 x 10 7 sec/cycle = 30 MHz. 10. If you were designing a network to control production robots in a factory
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Unformatted text preview: environment, what media would you choose? Why? The two primary considerations here are the amount of electrical noise likely in the facility, plus the fact that the media will need to be fairly robust to prevent damage. An analysis of a few media types follows: UTP reasonably durable, but very susceptible to interference. STP better shielding than UTP, but expensive. A possible solution Cable good shielding and durability. A possible solution Fiber no interference problems, but extremely fragile and expensive Radio not appropriate for indoors Infrared susceptible to interference from smoke, low data rate, LOS only Based on the above, STP or cable will work but cable is probably the best alternative due to its cost. As a side note, many factories still used early versions of Ethernet which were based on cable as a media (10base2 and 10base5)....
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