5.a. A link with an optical budget of 8 dB has a remaining margin of 3 dB. What's the total loss in this fiber link? A. 8 dB B. 3 dB C. 5 dB D. 11 dB 5.b. A certain fiber link has 24 available channels. What's the maximum number of lessees who could purchase wavelength leases in this cable link? A. 48 B. 12 C. 24 D. 18

5.a. A link with an optical budget of 8 dB has a remaining margin of 3 dB. What's the total loss in this fiber link? A. 8 dB B. 3 dB C. 5 dB D. 11 dB 5.b. A certain fiber link has 24 available channels. What's the maximum number of lessees who could purchase wavelength leases in this cable link? A. 48 B. 12 C. 24 D. 18

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter8: Data And Network Communication Technology

Section: Chapter Questions

Problem 2PE

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7.a. How many wavelengths are usually leased in a lit fiber lease agreement over two fibers?A. FourB. TwoC. OneD. Three7.b. When replacing a section of cable, the _______ must be less than the optical budget in the fiber link.A. attenuationB. insertion lossC. splice lossD. total loss
7. A cable link has an optical budget of 8.1 dB. Which of the following choices correctly describes the totalloss in this cable link?A. Total loss must be less than 8.1 dB.B. Total loss must be exactly 11.1 dB.C. Total loss must be equal to 8.1 dB.D. Total loss must be greater than 8.1 dB.
11. When a replacement cable section is spliced into a damaged cable, how should the optical budgetcompare to the total loss in the repaired fiber?A. The total loss must be greater than the optical budget.B. The total loss must be double the optical budget.C. The total loss must be less than the optical budget.D. The total loss must be equal to the optical budget.
(a) Why, in actuality, are only 124 or even less channels used instead of the total available 125 channels? (b) What is the maximum distance between two antennas for LOS transmission if the Transmitting antenna is 100m high and the receiver is at ground level? Now suppose that the receiving antenna is raise 10m high. To achieve the same distance, how high must the transmitting antenna be? Analyze the benefit of the new Tx height. (c) Define link budget? Let’s estimate the feasibility of a 100 km link, with one access point and one client radio. The access point is connected to an antenna with 10dBi gain, with a transmitting power of 30dBm and a receive sensitivity of -89 dBm. The client is connected to an antenna with 10dBi gain, with a transmitting power of 35dBm and a receive sensitivity of -85dBm. The cables in both systems are short, with a loss of 7dB at AP side and 14dB at client end with 1800 MHz frequency of operation. Calculate the expected power received and explain the link…
3. (a) Using the following Figure 3, estimate the attenuation (in dB) of a fibre optic cable for the indicated wavelengths and distances in the Table below. (b) The horizontal axis in Figures 1 and 2 represents frequency, while the horizontal axis in Figure 3 represents wavelength. (i) Determine the relationship between wavelength and frequency. (ii) If the propagation speed of light in an optical fibre is 2 x 108 m/s, sketch another representation of Figure 3 using frequency in the horizontal axis. Loss (dB/km) 100 50 10 5 1 0.5 0.1 0.05 0.01 T 800 Distance 1 km 10 km 20 km 1000 1200 1400 Wavelength (nm) L dB at 800 nm 1600 dB at 1200 nm Figure 3 1800
A network with a bandwidth of 20 Mbps can theoretically pass only an average of 12,000 frames per minute. a) What is the average size of the frame expressed in bits? b) The Achieved throughput is 5 Mbps. What is the ratio of throughput/bandwidth?
A Telecom operator has been assigned the bandwidth from 2100MHZ to 2105MHz, this can support 100 voice channels and 6 users per channel. Assume there is a guard band (inter channel space) of 10KHz then what will be the size of a single channel? And how many total number of users could be accommodated? Draw figure on your note book.
15.a. How can a poorly attached connector affect signal strength in a fiber optic cable?A. Insertion loss can decrease.B. Return loss can decrease.C. Splice loss can increase.D. Return loss and insertion loss can increase.15.b. A certain cable has a minimum bend radius of 10 cm. If you install this cable in a straight pull box, how long should the pull box be?A. Less than 40 cmB. Exactly 25 cmC. Exactly 40 cmD. At least 40 cm
A Telecom operator has been assigned the bandwidth from 2100MHZ to 2105MHz, this can support 100 voice channels and 6 users per channel. Assume there is a guard band of 10KHz then what will be the size of a single channel? And how many total number of users could be accommodated? Draw figure
Assume you are working as a Network Engineer for a Telecommunications service provider and your task is to estimate the feasibility of a 20 km link between two buildings with one access point and one client radio. The access point is connected to an antenna with 12 dBi gain, with a transmitting power of 500 mW and a receive sensitivity of -84 dBm. The client is connected to an antenna with 10 dBi gain, with a transmitting power of 16 dBm and a receive sensitivity of -82 dBm. The cables in both systems are short, with a loss of 3 dB at each side at the 900 MHz frequency of operation. What is the link margin? By examining the link margin, comment on the reliability of the link.
H2. Consider designing a 2 km-long, 1 Gbps LAN which uses CSMA/CD and has a propagation speed of 200 m/µsec. What is the minimum frame size and the optimal channel efficiency that can be achieved using this frame size?
18. How does a two-fiber BLSR network stay online if the work fiber in a span fails?A. Line switching routes traffic around a different span.B. Span switching routes traffic over protect fiber.C. The network must be upgraded to a f