Connectivity GCSE Edexcel
- Created by: amycheung128
- Created on: 08-01-17 19:14
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- Connectivity
- Digital devices
- Wired connections
- USB
- Lightning (apple)
- Thunderbolt (mac book)
- Wired mulitmedia
- HDMI
- Splitters
- Wireless communication
- Infrared
- Infrared uses a beam of light to send data. Very useful if only a small bit of data needs to be send over a small distance. Line of sight is required.
- Bluetooth
- Bluetooth is a way of exchanging data without wires over a short distance. It uses a special radio frequency to transmit data. If is quite secure and can connect up to 8 devices at the same time. It is low power also, so does not use much electricity.
- Wifi
- WiFi uses radio waves to connect devices together and can handle large volumes of data
- Infrared
- Wired connections
- Home networks
- Local area network (LAN)
- Connects all the computers in a house so that resources can be shared.
- Pros
- Sharing the internet connection
- Sharing files and backing up files
- Untitled
- Sharing peripherals like a printer
- Con
- Connecting to the Internet from a home network requires a router
- Wired
- Pros
- Higher life expency
- Cheaper
- High speed
- Reliable, not affected by anything else
- Cons
- Length of wire is limited
- affected by weather conditons
- Pros
- Wireless
- Pros
- Life expectancy
- Range
- Convient
- Cons
- Intercepted easily
- Price
- Speed is slower than wired
- Unrealiable, affected by other wireless signals
- Pros
- Local area network (LAN)
- Bandwidth
- number of bits that can go through the
network connection in one second
- measured in bits per second, bps
- High bandwidth for streaming so it wont pause
- number of bits that can go through the
network connection in one second
- Latency
- time in milliseconds between a bit
leaving one device and arriving at the other
- measured in milliseconds ms
- Low latency so you receive information quicker
- time in milliseconds between a bit
leaving one device and arriving at the other
- Hotspots
- Within range to access
- 60 metres range ( good)
- Potential hackers that put fake ones
- 3g/4g
- Greater coverage than WIFI
- more secure as data is encrypted
- Downloads are limited
- Costs money through
- Communication protocols
- Protocols are rules that devices follow when they communicate with each other
- POP3, IMAP, SMTP
- these are the rules used when sending emails.
- VoIP
- Voice over Internet Protocol is the set of rules for transmitting audio
messages over the Internet.
- people make free voice calls or, combined with a webcam, video calls
- Voice over Internet Protocol is the set of rules for transmitting audio
messages over the Internet.
- HTTP
- protocol of the World Wide Web (WWW). HTTPS is the secure version of this.
- Digital devices
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