Flashcards
data transfer 8
Cards in this deck (36)
- 1give a definition of VOIP"Voice over Internet Protocol is a group of internet protocols which provide a means of sending voice and
multimedia communication over the internet rather than by public telephone networks" - 2what is the main characteristic of VoIP software?coding and decoding sound and video (codec)..compressing and splitting into packets of data to send and reassembled on the receivers computer.
- 3name the current most popular example of VoIP softwareskype
- 4give an advantage of wireless networkingyou are not tied down to a fixed desk and can move around
- 5what do all workstations on a wireless network need?a wireless network card
- 6what transmission method do wireless networks use?radiowaves, although microwaves are sometimes used.
- 7name 3 different types of cable used to connect computer networksUTP/STP, CoAxial, Fibre Optic
- 8what does UTP/STP stand for?unshielded twisted pair, shielded twist pair, simple pairs of wires twisted together, the STP with a metal foil shielding
- 9what is Coaxial cable like?it has a solid wire core which transmits the data and a braided outer which shields and connects to earth. They are separated by a plastic layer.
- 10what is fibre optic cable?plastic or glass cable that uses light reflecting laser or LED to transmit data…the fastest!
- 11what speed does UTP/STP cable transmit data at and what is its maximum connection range?250Mbps over a maximum 100m
- 12what speed does Coaxial cable transmit data at and what is its maximum connection range?1000 Mbps over a maximum 100m … more for Cat7 coaxial cable
- 13what speed does fibre optic cable transmit data at and what is its maximum connection range?2.4 Gbps over a range of 50 km
- 14give an advantage of UTP/STP cablingcheap, twisting can cancel out some interference
- 15give a disadvantage of UTP/STP cablingit is slower with a lower capacity and can only be used over short distances
- 16give an example of use of UTP/STP cablingthe standard telephone network
- 17give an advantage of using coaxial cable for networkingit is faster and more reliable than STP
- 18give an example of the use of coaxial cableconnecting TV to satellite dish or cable TV network
- 19give an advantage of using fibre optic cablingvery fast and works over long distances
- 20give an example of a use of fibre optic cablecable TV companies supply the programmes via fibre optic to a main junction box in the street which is then connected to individual houses by coaxial cable
- 21name three methods of transmitting data wirelessinfra-red, microwave, satellite.
- 22describe the characteristics of infrared data transmissionshort range using infrared light.. Just beyond the visible spectrum
- 23what is the data transmission speed of infrared and what is its maximum range4 Mbps and 100m
- 24give an advantage of infrared transmissiontends to be reliable
- 25give a disadvantage of infrared transmissiononly works well over short distances, can suffer interference and needs to be in direct line of sight
- 26give an example of the use of infrared transmissionthe most common is using television remote controls
- 27describe the characteristics of microwave data transmissionit uses short wave radio transmissions working at very high frequencies
- 28what is the data transmission speed of microwaves and what is its maximum range300 Gbps and 100m
- 29give an advantage of microwave data transmissionsignal degrades very little over long distances
- 30give a disadvantage of microwave data transmissionneed to be in direct line of sight, can be affected by rain, pollen and sunspot activity
- 31give an example of a use of microwave data transmissionearth to satellite communication, Bluetooth
- 32describe the characteristics of satellite data transmissiondata is transmitted from earth to a satellite and then relayed to the appropriate receiving station on earth.
- 33what is the data transmission speed of satellite transmission and what is its maximum rangehuge amounts of data can be transmitted, range between 500km and 36000 km
- 34give an advantage of satellite data transmissioncan increase the distance a network can reach… i.e. all around the world
- 35give a disadvantage of satellite data transmissionexpensive to implement
- 36give an example of a use of satellite data transmissionglobal communication systems
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- Flashcards on data transfer 8, created by laurenmarie2287 on 08/01/2015.
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