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Unit 4: Communication Technologies - Coggle Diagram
Unit 4: Communication Technologies
Digital communications
the process in which two or more computers/devices transfer data, instruction and information
Communications involve cables and wires, or through the air (wireless)
Components needed for successful digital communications
Message
Medium
Sender
Reciever
Protocol
All types of computers/mobile devices can be sending or receiving devices
Communication devices connect sending/receiving devices to the transmission media
Transmission media can be wired or wireless
Wired – using cables & wires
Wireless – through the air
Network usage
Share Software
Share Data and Information
Transfer Funds
Share Hardware
Facillitate Communication
Networks
a set of devices (referred to as nodes) connected by communication devices and transmission media
Node
Computer
Printer
Any other device that can send/receive data
computer network requires
Hardware: access points, routers, switches, cables
Software: OS, applications
Network Types
Architecture
Client/serve, peer-to-peer
Topology
e arrangement or layout of computers/devices on a network
Ring, Bus, Tree, Mesh, Star
Area of Coverage
PAN, MAN, LAN, WAN
The Internet
Is a network - Short for INTERconnected NETwork
uses the Internet
for many purposes
Access information
Send/post messages
Communicate with friends and family
subscribe to youtube, netflik and other entertainment such as video games.
Communication devices, lines, and transmission media
Modems, wireless access points, routers, network cards, hubs and switches
Various dedicated digital lines
Cable
Digital Subscriber Line
Fiber to the Premises (FTTP)
T-Carrier
Asynchronous Transfer Mode (ATM)
Materials or substances that carry communication
signals
types of transmission media
• Physical
• Wireless
Convenient in places that are hard or impossible to install physical transmission media
Communication standards and protocols
needed to ensure compatibility in moving data between the different computers and devices on across networks
network standard defines
guidelines
the way computers access the medium to which they are connected
the type(s) of medium used
the speeds used on different types of networks
the type(s) of physical cable and/or wireless technology used
Networks standard
Ethernet
Token ring
Wireless Fidelity (Wi-Fi)
Long Term Evolution (LTE)
Ultra-wideband
Infrared Data Association (IrDA)
standard that outlines characteristics of how two devices communicate on a network
Transmission Control/Protocol/Internet Protocol (TCP/IP)
Bluetooth
Radio Frequency Identification (RFID)
Near Field Communication (NFC)
Mobile networks
G refers to Generation
0G: pre-mobile telephony technology e.g. radio, phone in cars
1G: voice only (analog signals)
2G: voice & data, added SMS
3G: voice, data & video, added MMS
4G: enhanced 3G
5G, 6G: the future generation, beyond 4G
Every generation
has improvements
Faster transmission rates for voice, data, video
Better quality
Bandwidth (amount of data, instructions and information that can travel over transmission media)