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Communication Technologies, Edited by: Janet Jong Chu Yuen (69941) -…
Communication Technologies
Digital Communication
Process in which two or more devices transfer data, instruction & information.
5 Components
Sender
Initiates instructions to transmit the message
Receiver
Accepts the transmission of the message
Message
To communicate: text, audio, video, pictures
Medium
Sender to receiver
Protocol
A standard for the sender & receiver devices to communicate
Network Usage
Transfer Funds
Share software
Share data & information
Facilitate Communication
Share hardware
Network
As a
nodes
connected by communication devices & transmission media.
Node
: Computer, Printer, Any other device that send/ receive data.
3 Types Network
Area of coverage
Geographical Area
Personal Area Network (PAN)
Body Area Network (BAN)
Local Area Network (LAN)
Wireless or wired LAN
Single-building LAN
Multiple-building LAN
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
Architecture
Configuration of computers, devices & media on a network.
Client/Server & Peer-to-peer
Clients on the network request services from the server
10 or more computers or less
Each computer on network = a peer
fewer than 10 computers
Topology
Arrangement of devices on a network
Ring & Star & Bus & Tree & Mesh
Internet
Internet & WWW are NOT same
Internet = network
Service on the Internet
Proposes
Access information
Send/Post messages
Communication
Access social media
Communication Devices, lines, & Transmission media
Communication devices
Modems, wireless access points, routers, network cards, hubs & switches.
Communication Lines
A dedicated line is a type of always-on physical connection that is established between 2 communication devices.
Communication Transmission Media
Physical & Wireless
Physical: Twisted pair cable( copper), Coaxial cable (copper), Fiber-optic cable( Glass/Plastic)
Communication Standards & Protocols
To ensure Compatibility in moving data between the different computers & devices on across networks
Network Standards:
Ethernet, Token ring, Wireless Fidelity(Wi-Fi), Log Term Evolution (LTE), Ultra-wideband & Infrared Data Association (IrDA)
Network Protocols:
Transmission Control, Protocol/ Internet Protocol (TCP/IP), Bluetooth, Radio Frequency Identification(RFID), & Near Field Communication (NFC)
Mobile Networks
Cellular Network
G = Generation
0G: pre-mobile telephony technology
1G: Analog signals (1981) - 2Kbps
2G: Voice, data & SMS (1992) -64Kbps
3G (2001): Voice, data & Video
4G(2001): enhanced 3G
5G (2019), 6G: the future generation, beyond 4G
Edited by: Janet Jong Chu Yuen (69941)
