Question

1. Broadcast networks refer to networks such as LANs connected by technology such as Ethernet. Broadcast networks, by nature, are multiaccess where all routers in a broadcast network can receive a single transmitted packet. Discuss the requirements or deficiencies of a network layer (OSI layer 3 and TCP/IP layer 2) in a broadcast network.
2. The local cable TV company is considering removing all the coaxial cable and replacing it with fiber-fibre-optic. List the advantages and disadvantages of this plan.                              

Answer 1

As an introduction coaxial cable are haveing many problems when compired to fiber-optic cable.Basic properties of fiber-optic cable are given below:

Fiber optics are significantly faster than coaxial cables

-- Although optical fibers are hair-thin, they have the capacity for greater bandwidth than traditional cables. Fiber technology has transformed the way we transmit data, video and voice.

Fiber optics are more eco-friendly than coaxial cables

--The copper cables stored in data centers produce a significant amount of excess heat. This requires cooling systems to work harder to keep the center at an appropriate temperature.

--Fiber-optic technology, on the other hand, does not generate excess heat. Therefore, not as much energy is required to cool down the data centers.

--Additionally, fiber-optic cables require less insulation and jacketing than copper cables. Heavy metals are often used in wire insulation and jacketing, and it’s better for the environment to avoid using these materials when possible.

Fiber optics are the technology of the future

--Fiber-optic Internet simply provides more bandwidth than cable. With more bandwidth, fiber optics more easily allow for data-heavy Internet tasks that you regularly perform – such as online gaming, streaming TV shows and movies, video chatting and more.

--As more and more devices in the home require an Internet connection, it is possible that coaxial cables will not be able to support households’ Internet demands. Fiber-optic Internet will be able to support more bandwidth-intensive activities.

--Finally, fiber optics are typically upgraded through advancements to the electronic light pulse technology, not by replacing the cable equipment. For this reason, fiber is considered “futureproof” – the technology can easily evolve.

Fiber optics offer more secure communication than coaxial cables

One benefit of fiber-optic technology is increased security. It is more difficult to tap fiber-optic cables than traditional copper cables. It would be hard to to tap fiber-optic cables without also disrupting the system.

Additionally, the signals of fiber-optic cables are considered dielectric and do not transmit electricity. This makes data interception very difficult compared to the electromagnetic signals of coaxial cables

The advantage sand disadvantages of the coaxial cabel over fiber-optic are as follows:

Advantages.

1. Data transmission speed is faster, super low noise, and low-error data transmission rates.

2. Security is more efficient and cannot be wiretapped like coaxial cable.

3. Distance of data transfer is superior.

4. The speed of propagation of fiber-optic media is near the speed of light(Data Commutations and Computer Networks p. 93).

5. The quality of image being transfer to their customers is going to be vast indefinition and feature.

6. Environmental factors do not disturb fiber-optic transmission as much ascoaxial cabling.

Disadvantages.

1. Cost of fiber-optic is really expensive compared to coaxial cable.

2. In order to support two-way transmission, two fiber-optic cables are required.

3. Coaxial cable more flexible and easier to expand.