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    Questions Questions Document Transcript

    • 1.When did Videogames appear and what did they look like? Lisa The earliest example is from 1947—a "Cathode ray tube Amusement Device" was filed for a patent on January 25, 1947. Inspired by radar display tech, it consisted of an analog device that allowed a user to control a vector-drawn dot on the screen to simulate a missile being fired at targets, which were drawings fixed to the screen.[4] 2.What is a MODEM and what is it used for? Jandro Is a device that modulates an analog signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The objective is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any analog signals, from diodes to radio. 3.Why ADSL can transmit the digital information at the same time than conversations? Jandro Because ADSL uses frequencies that arent used by a voice telephone call. A splitter, or DSL filter, allows a single telephone connection to be used for both; ADSL service and voice calls can occur at the same time. 4.What are artificial satellites used for? Name the first one. Suany The primary uses for an artificial satellites are the communication, the observation, the location and the habitation. As our technology continues to expand its likely that uses for artificial satellites will as well. The first satellite was the sputnik, thrown to the space by russia 5.How the GPS receiver calculates the position?Suany 6.Which devices are used as external memories? JaviThe most common form of external memory is a hard disc which is permanentlyinstalled in the computer and will have a capacity of hundreds of megabytes.Information is recorded on the disc by magnetising spots. ne type of device that can be used for external memory is anexternal hard drive. Most external hard drives connect to a computer through a USB port.Flash Drives•The typical type of external memory that most people use and are familiar with are portable Flash drives. Portable Flashdrives store data using non-volatile memory which means data will stay on the drive when it is not connected to a computer.Memory CardsMemory cards are used in devices such as cameras, GPS systems and and cell phones. These memory cards are typicallytypes such as microSD or Secure Digital. 1.Explain the four generations of mobile technology, indicating the improvements of each. Ana 1st generation: People were able to transfer calls from one site to another as the user travelled between celsl during a conversation. The first commercially automate cellular network was launched in japan in 1979. After japan, Denmark, finland, sweden and Norway in 1981. In the beginning of the 80s in Baltimore and Washington DC there were alread 180 users and 300 Motorola Dyna-tac phones. 2nd Generation: Emerged in 1990, they used GSM standar, wich used digital transmission instead of analog. After the rise of 2G, many people started using it and so this contributed to prepaid phones. The first GSM network launched in Finland, it was more used in europe than in america. Technology made improvements like batteries and electronics. Second generation also introduced the SMS or text message. 3rd Generation: The difference beetwen 2g and 3g is that 3g started packet switchingfor data transmission. The first precommercial network with 3g was launched in 2001 in Tokyo. The fast and high connection of the 3G technology enabled a transformation in the industry. By the end of 2007 there were 295 million subscribers on 3g network worldwide. In the third generation, also the mobile internet appeared and Wi-fi. 4th Generation: By 2009, it became clear that, at some point, the 3G networks would be overwhelmed by the increasing number of applications like, for example, the streaming media. In consequence, the industry began looking for data-optimizing technologies, who would have up to 10-fold speed improvements more than the 3G networks. So they started creating the fourth generation. The first two 4G technologies were offered in Scandinavia (WiMAX & LTE standard). The basic difference between 3G and 4G newtorks is that the 4G connections are about 10 times faster.
    • 2.Which are the differences by means of signal speed between optical and cupper wires? Jandro The main difference is that optical wires are especially advantageous for long-distance communications, because light propagates through the fiber with little attenuation compared to electrical cables (cupper wires). Because of its advantages over electrical transmission (faster) , optical fibers have largely replaced copper (Cu) wire communications in in the developed world. 3.Explain the basis of image generation in cathode ray tube screen. Differences in colour and black-and-white TV. Annika The electron gun is responsible for generating a narrow beam of electrons, after passing through the different electrodes, impacts on the screen. To control this issue is placed the control grid, which controls the brightness and and the impact of electrons on the screen, use another grid called the screen grid to be attracting more potential than the cathode. To maintain stable beam use third grid, the approach, which forces the electrons follow a trajectory to ultimately impact the final anode (the screen). 4.Which is the role of Modem in LAN? Federico 5.Why are internet models OSI and TCP/IP divided into layers? How do these protocoles work? Laia The OSI and TCP/IP are divided into layers because, if its divided its more easy to group related functions and implement modular communications software. 6.What is a MAC address? AshleyMedia access control. Is a hardware identification number that uniquely identifies each device on a network. Its made in a structure of 48 bits. Its configured by themul IEEE (the last 24 bits) and the manufacturer (the first 24 bits) 7.Who invented the screw-press and why was it so important? How written information was broadcasted before it? Explain these ideas. Claudia 8.What do we call Multimedia to? What is it used for? Lisa The word multimedia is used to refer any object or system that uses multiple means of expresion to communicate or present the information. The media can be variated, text, images, sound, video and animations, for example... 9.Differences between first and last generation of cellular phones. Ana On the first generation of cellular phones were used the 1G. There were about 180 users and 300 motorola Dyna-Tac phones. are all set to provide data transfer rates of 100Mbit/s to 1Gbit/s 10.What is a network protocol and how does it work? Federico A network protocol designates the set of rules that govern the exchange of the information trough a computer network. A network protocol designates the set of rules that govern the exchange of information through a computer network.Layer OSI model establishes a specialized protocol stack must be identical for sender and receiver. The OSI stack is ordered from the physical model of the network to abstract levels as the application or presentation. 11.Which are the applications for instant communication? How do them work in terms of network? Laura 12.Which were the first machines that made numeric calculations for the first time? Explain a little their working. Ellie The abacus were the first machines that made numeric calculations. It is devided in two parts by a bar. The lower part has 10 bars with five balls in each bar. Each ball is like 1. In the higher part there are 10 bars with 2 balls in each bar. 13.Which devices became more important from screw-press up to telephone? Explain them a little. Isabella. Pencils: it was discovered a big source of graphyte. It was a very pure and solid material, and it was so easy to put it into a stick, and the locals found that it was very useful for marking sheep. Semaphore lines. Electrical telegraph: It’s a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. Fax: it was invented by Alexander Bain Fax is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device. Typewriter: A typewriter is a mechanical or electromechanical device with keys that, when pressed, cause characters to be printed on a medium, usually paper. 14.Which was the first wire transmission? Explain its evolution and the phone networking nowadays. Nico