Transmission Methods 4z34q

Transmission Methods

Within this blog I am going to be discussing specific transmission methods and i will be giving examples of where they are used and I will be explaining why they are used. I will also be giving advantages and disadvantages of each. Coaxial

Coaxial cables are a transmission device used by cable TV companies to attach a community antenna with the s TV. For example many households and business use this to be able to watch TV. Advantages of this are most electronic that have been released are compatible with the coaxial cable. Coaxial cables also have the capability to prevent any interference caused towards the television allowing the best possible quality of pictures. Disadvantages of a coaxial cable are they are very bulky and are often only sold at one length meaning that you might have to purchase excess cable. It is also very difficult to install or uninstall and often needs the use of specific tools. Coaxial cables are often chosen as the main transmission method for TVs due to the fact that most homes have multiple outlets for coaxial cables within each room. For example sky boxes use coaxial cables to ensure every household that purchases them; they are able to use it easily.

Optical fibre

Optical fibre cable is a cable that contains one or more optical fibres that are used to transport light. Each element is usually individually coated with plastic layers and kept protected within a tube to ensure it isn’t damaged where it will be deployed. Examples of this are, broadcast Cable Company’s use them when wiring CATV, HDTV, internet, video on demand and

other applications. Advantages of this are the amount of data that can be transmitted within one unit time of fibre over other transmission media. Another advantage is that it is much smaller than a coaxial cable. Disadvantages of this are that it can be very expensive to install. The main purpose for optical fibre cables is to provide high speed internet within someone’s home or for a business. They are also used by many telephone companies and are replacing traditional telephone lines. Unshielded twisted pair (UTP)

Unshielded twisted pair is a pair of wires that are twisted around each other to help prevent or reduce any possible interference. Telephone and Ethernet cables are examples of UTPs. Advantages of this are the fact that interference is reduced and minimised, they are also extremely fast. Disadvantages of this are that they can be affected by any radio frequency or electromagnetic interference. The main purpose of unshielded twisted pair is to be used for local area networks and for telephone connections. Shielded twisted pair (STP)

Shielded twisted pair is a special kind of copper telephone wiring. A shield covering is simply added over a twisted pair wire. The main purpose of shielded twisted pairs is to be used as Ethernet or Telephone cables. Advantages of a shielded twisted pair are that they are less likely to be interfered by any electrical devices and in turn are less likely to cause interference to other devices. Disadvantages of this are that they are very big and space consuming and they are also very expensive.

Infra-red

Infra-red transmission is where energy within the electromagnetic radiation spectrum has wavelengths that is lower than radio waves, but is higher than those from visible light. The main purpose of this is the LED in a TV remote, when you push a button it flashes 38,000 times a second allowing it to transmit data. An advantage of this is that it is inexpensive and it is undetectable by the human eye. Disadvantages of this are that it only has a short range. Another disadvantage is that the transmission can be blocked if the light is covered. The speed is also slower than wired transmission. Radio

Radio is simply radiation or wireless transmission of electromagnetic signals within the air. The main purpose of this is to allow the transmission of television and radio programmes. Advantages of radio transmission is that a radio programme receiver does not need to be in direct view of the transmitter and therefore can be used on a large scale. A disadvantage of this is that repeater stations are often needed to improve the quality of the signals which can also be very expensive.

Microwave

Microwave transmitters and receivers are devices that transmit signals such as mobile phone calls. Microwave radiation is transferred through the air and can be used to transmit information to and from satellites that are in orbit. Advantages of this are that it can be used on such a large scale and is used by most people daily. Disadvantages of this are that some people believe there to be health risks linked to it due to the microwave radiation being transmitted and they think that it can be a main cause for cancer, although this is not accepted by everyone because scientific studies prove that the intensity of the microwaves is too low to damage any tissue and they are not ionising. The main purpose of Microwave transmitters is to make it possible for people to make mobile phone calls or for them to send texts. Satellite

A satellite that is used for communication is artificial and is sent into space manually. These are used for telecommunications. An example of a use for satellites is astronomy satellites that allow astronomers to study space and receive live feeds or constant pictures to update them. Advantages of this are that it has a large range and allows endless possibilities. Disadvantages of this are that it can be very expensive to make and can be very difficult to repair if there is any damage. Comparison Each transmission method is effective in its own way and each has positives and negatives that make them better within certain situations. For example coaxial wiring is the best option for specific devices such as sky boxes. This is effective as it minimises the interference from other sources which might cause the image to become distorted. Therefore this means that it is effective for its purpose. If radio waves were used to transmit the data then there will be a high chance for there to be interference and therefore the quality of the images will become distorted, therefore it would not be effective if it was used for this purpose.

Another comparison that can be made would be what transmission method would be the best for connecting to the internet. STP is the best choice for security; however it is not as affective in bandwidth as fibre optic. A UTP would also be an effective choice as it is cheap and easy to install, however it might not provide the best security and bandwidth for the . An STP is a lot more expensive than UTP due to the higher security. An optical fibre cable is possibly the best option for this as it provides the best security and the highest bandwidth; it also provides very high broadband speeds. However a disadvantage of this would be that it can be very expensive to install compared to UTP and STP. All three examples work effectively for their purpose and it is down to the ’s preference. The most effective transmission method for mobile phones would be microwaves, this is because they can work in a large area and can be used anywhere across the world within a certain amount of distance away from a small antenna in order for them to connect and receive signal. An alternative could be radio waves, however this can become interfered easily and therefore it in not as effective for this purpose.