communication-devices-and its working on machine

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1. Communication Devices Topic Name

2. Communication Devices A communication device is a hardware device capable of transmitting an analog or digital signal over the telephone, other communication wire, or wirelessly. The best example of a communication device is a computer Modem, which is capable of sending and receiving a signal to allow computers to talk to other computers over the telephone. Other examples of communication devices include a network interface card (NIC), Wi-Fi devices, and an access point.

3. Communication Devices

4. History of Communication devices The first means of communication was, of course, the human voice but about 3,200 BC writing was invented in Iraq and Egypt. It was invented about 1,500 BC in China. The only American civilization to invent a true system of writing were the Mayans. Communication 1500-1800 The next major improvement in communication was the invention of printing. The Chinese invented printing with blocks in the 6th century AD but the first known printed book was the Diamond Sutra of 686.

5. History of Communication devices The first newspapers were printed in the 17th century. The first newspaper in England was printed in 1641. (However the word newspaper was not recorded until 1670). The first successful daily newspaper in Britain was printed in 1702. Communication in the 19th Century Communication became far more efficient in the 19th century. In the early 19th century the recipient of a letter had to pay the postage, not the sender. Then in 1840 Rowland Hill invented the Penny Post.

6. History of Communication Devices

7. Advantages of Communication Devices Communication devices can change the world of a person with a disability. The ability to express needs, wants, and personality can be rewarded through a communication device. Children who get these devices at a young age have a bigger window to the world.

8. Advantages of Communication Devices Convenience is a major factor in the use of electronic communication devices. There is a greater level of ease attached to the use of the Internet and cell phones to communicate. Email enables you to send messages without much movement and effort compared to sending mail by post. The Internet is also a wealth of resources such as books, journals, and online stores where you can access anything you want. Cell phones are a source of convenience; they allow you to make a call to anyone irrespective of time, and distance.

9. Advantages of Communication Devices Electronic communication devices are easily accessible to people who would otherwise not have other modes of communication. In developing countries people who never owned a home telephone have cell phones. Cell phones also continue to evolve at a rapid rate. Many are now available that provide three or four ways to communicate, such as Internet connections, text messaging and standard phone links

10. Some communication devices are as follow: Modem Router Hub Network Cards Laptop Fax Machine Mobile Phones Bluetooth

11. Modem: Modem is a electronic devices that convert digital data signals into modulated analog signals suitable for transmission over analog telecommunications circuits. A modem also receives modulated signals and demodulates them, recovering the digital signal for use by the  data  equipment. We have two types of modems: Voiceband modem Cable modem

12. Voice Band modem: They enable digital terminal equipment to communicate over telephone channels, which are designed around the narrow bandwidth requirements of the human voice. Modems operate in part by communicating with each other, and to do this they must follow matching protocols, or operating standards. Worldwide standards for voiceband modems are established by the V-series of recommendations published by the Telecommunication Standardization sector of the International Telecommunication Union  (ITU).  

13. Voice Band modem: Voiceband modems are used for telephony type infrastructures such as the dial-up network, analogue leased lines and voice channels of radio links. But also for communication over "dry" copper cable, voice band modems are widely used. 

14. Cable modem: Cable modem support the transmission of data over hybrid fibre -coaxial channels, which were originally designed to provide high-bandwidth  television  service. A  cable modem  connects to a cable television system at the subscriber’s premises and enables two-way transmission of data over the cable system, generally to an  Internet service provider  (ISP).

15. Cable modem: The cable modem is usually connected to a personal computer or router using an Ethernet connection that operates at line speeds of 10 or 100 Mbps. At the “head end,” or central distribution point of the cable system, a cable modem termination system (CMTS) connects the cable television network to theInternet .

16. Router: In the middle of that, is the wireless router. I know you knew that, but it had to be said. Wirelessly attached to it are a laptop, a PC, and a Mac. Actually, the Mac is in there to show that the computers don’t necessarily need to be the same kind or platform. One might be sending up a file to work, one might be downloading something from YouTube and one is reading MakeUseOf.com – of course. All this information is coming down from, and up to, the Internet.

17. Router: The router can only talk to one of these things at a time. The process I’m about to talk about just happens so fast that it  seems  to happen all at once. Let’s say that the Mac is uploading a file to work, the laptop is watching YouTube and the PC is surfing MakeUseOf.com. Each communication happens in small packets of data.

18. Hub: Hub is defined as one common point for connecting all networks devices. Various LAN segments are connected to hub in order to organize the working of network. Fifteen to 20 years ago,  hubs  were the preferred method  interconnecting network devices  like PC's, routers, network printers and more. There are two Type of hubs: Passive hub Active hub

19. Hub: 1. Passive hub 2. Active hub The passive hub is just a connector. It connect different wires coming from different branches It regenerate or implify the signal before the transmission

20. Hub: When referring to a  network , a  hub  is the most basic networking  device  that connects multiple computers or other network devices together. Unlike a network  switch  or router , a network hub has no routing tables or intelligence on where to send information and  broadcasts  all network data across each connection. Most hubs can detect basic network errors such as collisions, but having all information broadcast to multiple ports can be a security risk and cause bottlenecks. In the past, network hubs were popular because they were cheaper than a switch or a router.

21. Hub: In this picture you can see a hub that connects different computers together and with other devices.

22. Network Card : A network card, sometimes called a network interface card (NIC pronounced nick), is a communications device that enables a computer or device that does not have built-in networking capability to access a network. The network card coordinates the transmission and receipt of data, instructions, and information to and from the computer or device containing the network card.

23. Network Card: Network cards are available in a variety of styles (Figure 9-29). A network card for a desktop computer is an adapter card that has a port to which a cable connects. A network card for mobile computers and devices is in the form of a USB network adapter, Express Card module, PC Card, or a memory card.

24. Laptop: A laptop computer  is a portable personal computer light and small enough to sit on a person's lap. A laptop computer can be powered by battery or plugged into the wall. The main utility of a laptop computer is that it allows a person to travel with their computing resource.

25. Laptop: We can communicate with laptop through connecting it to internet. We can make video calls with different users and communicate our thoughts. Laptop computers can communicate with other laptop computers in several ways, each depending on what type of hardware and software is available. Laptop to laptop communication is used to share information from one laptop to another and encompasses anything from work

26. Laptop: Laptop can also communicate with different apps just like whatsapp , imo and viber . When we connected the laptop to internet we can communicate our data or information through Google mail.

27. Fax Machine:

28. Fax Machine A device that sends and receives printed pages or images over telephone lines by digitizing the material with an internal optical scanner  andtransmitting  the information as electronic signals.  From Alexander Bain's 1843 invention to today's internet based fax systems (and everything in between) Alexander Bain - Developed an Experimental Fax Machine between 1843 and 1846. Arthur Korn - Developed Fax Machine for Transmitting Photographs. Edouard Belin - Inventor of the Belinographe .

29. Fax Machine:

30. Fax Machine: A fax machine is also called telefax . The machine scans the document. It transfers the image of that document into a signal That signal is sent down a telephone line to another fax machine The other machine decodes the signal and reproduces the document

31. Fax Machine: You can walk into nearly any office and you'll find a fax machine. Connected to a normal  phone line , a fax machine allows you to transmit pieces of paper to someone else instantly! Even with FedEx and  e-mail , it is nearly impossible to do business ­without one of these machines today.

32. Mobile Phone: A mobile phone is a wireless handheld device that allows users to make calls and send text messages, among other features. The earliest generation of mobile phones could only make and receive calls. Today’s mobile phones, however, are packed with many additional features, such as Web browsers, games, cameras, video players and even navigational systems. Mobile phone may also be known as a cellular phone or simply cellphone .

33. Mobile Phone: When caller/you speak, your/caller's voice is converted to analog form by microphone of the mobile. This analog signal is then converted to digital form and is being sent to nearest mobile base station through microwave signals. When nearest mobile base station of caller recieves microwave signals, it converts it immediately to digital electrical form and it sends to the receiver's nearest mobile phone base station via unique channel that was created before. 

34. Bluetooth: A Bluetooth device works by using radio waves instead of wires or cables to  connect with your cell phone , smartp Bluetooth is a wireless short-range communications technology standard found in millions of products we use every day – including headsets, smartphones , laptops and  portable speakers . A product with Bluetooth technology, such as a  Bluetooth headset , has a tiny computer chip inside that contains the Bluetooth radio, and software that makes connectivity between devices possible.hone or computer.

35. Bluetooth: