Types of communication devices (2023)

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Task 1a – Identify and explain types of communication devices


PDA stands for personal digital assistant. PDA’s are like hand held computers. PDA’s are used as mobile phones, they are used for e-mail, web browsing and as media players. PDA’s are touch screen devices and the only keypad is built into the device.

Wireless Network Interface Card

Wireless NIC’s are network cards that connect to computer networks. These computer networks are radio based. Regular NIC’s connect wired through Ethernet cables.

Wireless network interface cards work in modes: infrastructure and ad hoc.

When using infrastructure mode, you need an access point to connect to. When using ad hoc mode you do not need to connect to an access point, instead you connect to other wireless devices. However, you need to be using the same channel and the same SSID.


Switches send packets to different IP addresses. Switches are an important part of a network because they speed things up. Switches allow direct communication between computers efficiently. LAN switches create a series of networks that only contain two devices.


Routers connect multiple devices to the internet at the same time. A router is a network device that forwards information. It can connect two or more logical subnets to the interface of the router. These subnets are not always mapped one to one. Routers store MAC addresses from computers that have used it to get on the internet.


A network bridge connects network segments together. Network bridges are like network hubs because they connect network segments at the physical layer; however network bridges analyse data packets on other segments of the network. A bridge processes the information it receives and then works out the MAC address using the bridge.


A computer is a machine that follows instructions to manipulate data. Computers are very versatile because they have a lot of programs on them which make them different from calculators. As long as a computer has enough storage capacity and time it can out any computational task, no matter how large the task.

(Video) Types of communication devices

Wireless keyboard and Mouse

A wireless keyboard connects to the computer by using infrared or Bluetooth signals. An infrared wireless keyboard requires the signal from the keyboard to the computer to be in a straight line for the signal to reach the computer properly. Wireless mice work in the same way. They use infrared radio frequency signals to connect with the computer.


In laser printers, they scan the paper to make sure that the paper is in correctly. Then the print on the ink on the paper one line at a time until the print job is finished. All other printers work in the same way.

Mobile phone with WAP

Mobile phones that have WAP enabled allow users to browse the internet on their phone. It lets users use the phone like a computer and only lets users download music, videos and browse headlines.


A walkie talkie works on a half duplex transmission. It allows people to communicate from a distance. However, it only allows people to talk one at a time. Also other people with other walkie talkies can listen in on conversations.


GPS stands for global positioning system. There lots of satellites that transmit signals to the ground. GPS devices do not transmit signals they only receive them. To work well GPS devices require a clear sky and don’t work well in forested areas.


Wireless networks use radio waves like radios and mobile phones. Devices using wireless internet receive radio waves and internet connection. Wireless routers translate data into radio signals and send it to devices using the router to get on the internet.

Chapter 2


Simplex transmission either sends or receives data. It allows transmission in one direction.

Half duplex

Half duplex transmission allows two people to communicate with each other. However, it only allows one person to speak at a time.

Full duplex

Full duplex transmission allows two people two communicate at the same and lets them both talk at the same time.


Serial data travels one bit at a time. It travels through data cables in straight lines, like single file. The data travels quickly because it travels one bit at a time.


Parallel data travels simultaneously eight bits at a time. This can be faster than simplex transmission as parallel travels more bits at a time. However, it can also be slower than serial at times because parallel transmission needs wider cables to travel at its fastest speed.

(Video) Devices Used for Communication | Communication Technology | Liy Learns Tutorial


Infrared radiation is electromagnetic. Infrared waves travel at a frequency that makes it invisible the naked eye. This is because its wavelength is larger than light. But its wavelength is less than microwaves.

Radio link

A radio link is a two way system of communication. A radio link is used to provide control over two different points from a distance. They send and receive radio waves.


Laser stands for light amplification by stimulated emission of radiation. It emits light using a process called stimulated emission within the electromagnetic radiation. The light that a laser emits is a narrow low-divergence beam. Optical lenses are used to convert these beams.


Bandwidth travels in bits. Different bandwidths travel at different rates. Bandwidth is what is used to connect to the internet. Every internet connection has a bandwidth capacity and is measured in hertz.


Synchronous transmission synchronises transmission speeds when sending and receiving at each end of the transmission clock. Data is constantly streamed into both ends of the transmission clock and does not start and stop.


Unlike synchronous transmission, asynchronous transmission starts and stops. Asynchronous transmission allows data to travel ten bits at a time. It adds a one or a zero to the start and end of a binary code. The first added digit is to let the transmission know data is coming through and the other at the end of the code is to let the transmission know that the code has ended.


Digital system technology uses discontinuous values. The discontinuous values include numbers, letters and icons. It also uses continuous values which include sounds and images.


Analogue data travels in continuous streams. Analogue is more accurate than digital because digital uses ones and zeros which means they can only approximate audio and video signals.

Error detection and correction

There are several techniques that can be used to reduce data transmission errors: Parity checking and CRC are a couple of techniques.

Parity checking

Parity checking uses a parity bit. This is a bit that is added to a number of bits with the value one to make sure that it is odd or even. There are two parity bits: even and odd. When even, the parity bit is set to one if the total amount of ones is odd therefore making it even. When using an odd parity bit the parity bit is set to one if the amount of ones is even therefore making the amount odd.

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(Video) Communication Devices


CRC is a non secure hash function. CRC detects changes to raw computer data. A CRC enabled device calculates a short fixed binary sequence for each block of data. It sends or receives them at the same time. The device repeats the calculation when a block is sent or received and contains a data error if the result does not match.

Chapter 3


Tcp/ip stands for internet protocol suite. The internet protocol suite is made up of a set of protocols that can be used on a computer network. Tcp/ip is made up of layers. These layers are the link layer, the internet layer, the transport layer and the application layer.


SMTP stands for simple mail transfer protocol. The SMTP is what transfers the email data from one computer to another. The SMTP body is the entire message and is different from the message body.


FTP works similar to web pages. Every FTP server file is given a url so other computers ca find it when they are connected to the internet. Users can use web browsers or FTP clients to upload and download files.


UPnP is used as a way of automatically forwarding ports so people don’t have to do it manually. UPnP stands for universal plug and play. The goal of UPnP is to allow devices to connect to the internet effortlessly and simplify installation of devices and networks.


Bluetooth is an open wireless protocol. It allows data exchange over a short distance. The data is transferred using radio waves from stationary mobile devices. This creates personal area networks. Stationary Bluetooth mobile devices can connect to multiple devices at a time, avoiding synchronisation problems.

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Types of communication devices? ›

Communication device examples
  • Bluetooth devices.
  • Infrared devices.
  • Modem (over phone line)
  • Network card (using Ethernet)
  • Smartphone.
  • Wi-Fi devices (using a Wi-Fi router); examples shown below.
Jul 10, 2019

What is a communication device give example? ›

The most familiar example of a communication device is the common telephone modem (from modulator/demodulator). Modems modulate, or transform, a computer's digital message into an analog signal for transmission over standard telephone networks, and they demodulate the analog signal back into a digital…

What are communication devices in computing? ›

A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device. One type of communications device that connects a communications channel to a sending or receiving device such as a com- puter is a modem.

What are the main communication devices in multimedia? ›

​Multimedia communication deals with the transfer, protocols, services, and mechanisms of discrete media data (such as text and graphics) and continuous media data (like audio and video) in/over digital networks. Bluetooth devices. Infrared devices. Smartphone.

What are modern communication devices? ›

Its features often include phone service, fax service, email and Internet connections. These are usually utilized by employers to equip their employees in instances wherein the use of laptop computers are not possible. The recent addition to the modern devices utilized for communication would be virtual assistants.

What are the uses of communication devices? ›

Communication Devices and Their Uses
  • Telephone Etiquette.
  • Voice Mail.
  • Text Messages.
  • Telephone Directories.
Apr 8, 2017

Is TV a communication device? ›

Television, which made its debut for moving pictures in 1926, very quickly became a primary communication source following the end of World War II in 1945.

What are the three ways of communication for a device? ›

When communication occurs, it typically happens in one of three ways: verbal, nonverbal and visual.

What are the characteristics of communication devices? ›

For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware (physical equipment) and software (programs). The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter.

Which is not a communication device? ›

bridges is not a network communication device.

What is example of communication? ›

These include face-to-face conversations, telephone calls, text messages, email, the Internet (including social media such as Facebook and Twitter), radio and TV, written letters, brochures and reports.

What is example of communication? ›

These include face-to-face conversations, telephone calls, text messages, email, the Internet (including social media such as Facebook and Twitter), radio and TV, written letters, brochures and reports.

What is communication devices Wikipedia? ›

A communications system or communication system is a collection of individual telecommunications networks, transmission systems, relay stations, tributary stations, and terminal equipment usually capable of interconnection and interoperation to form an integrated whole.

Which is an example of communication device used in video conferencing? ›

Here are some of the most commonly used video conferencing equipment: Displays: laptop, desktop monitor, television screen. Microphones and cameras: built-in microphones and webcams, USB microphones and webcams. Speakers: built-in computer speaker, external speaker, VoIP (voice over IP) conferencing phone.

What are examples of storage devices? ›

  • Magnetic disks,Tapes and DVDs is an example of storage devices.
  • Hard Drives, CD-ROM and DVD-ROM drives, floppy disk drives, and tape drives are all examples of storage devices. ... ...
  • A magnetic disk is a storage device that uses a magnetization process to write, rewrite and access data.


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