Data Transmission Flashcards
What is data transmission
Involves sending digital messages between devices in a network, such as LAN or over the internet
What kind of issues are there with data transmission
Security
Bandwidth & latency
Compression
Codecs
How is security an issue when transferring data
User authentication - prevents unauthorised access with users usernames & passwords
Firewalls - prevent unauthorised access
Encryption - ensures data cannot be read
What is bandwidth & latency
Bandwidth - the rate of data transfer over a network (usually measured in bits per second)
Latency - time delay for a data packet to transfer to its destination (usually measured in mileseconds)
How is bandwidth & latency an issue when transferring data
Bandwidth affects how long files take to download.
Online gaming needs very slow latency as players need a fast response for real time updates or character movements.
Video calls need low latency & high bandwidth as you need to transfer a lot of data (video & audio) but you also want a fast response to avoid stutter
How is compression an issue when transferring data
Compression is used for images to be displayed on the web, video & audio in streaming & VOIP & documents attached to emails
Lossy - data removed during compression is permanently deleted (commonly used in images, audio & video)
Lossless - all original data can be recovered when uncompressed (commonly used for documents)
How is codecs an issue when transferring data
A program that is used to compress & decompress video & audio files. This reduces the space they take up on the disk & allows fast transfer over a network, such as the internet for online streaming.
This leads to a loss of quality in the video or audio - in the resolution, fps or both
