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1835293
3j - Broadband Connections
Description
Mind Map on 3j - Broadband Connections, created by James Dove on 05/01/2015.
Mind Map by
James Dove
, updated more than 1 year ago
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Created by
James Dove
over 9 years ago
18
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Resource summary
3j - Broadband Connections
ADSL
Asymmetric Digital Subscriber Line
Uses a range of frequencies on exsiting copper and telephone cables
Has the largest range of frequency for donwloads
Quicker to download files than to upload files.
Bandwidths are typically either 4, 8, 20 or 24 Mbps
Factors affecting bandwidth
Distance from exchange
Interferance from AM radio
Other devices connected to phone line
Electrical interferance
Used in homes, not businesses
Low upstream bandwidth
Bottlenecks
Cable
Infrastructure is fibre optic, therefore higher bandwidths are available
Typical bandwidths are 20 or 50 Mbps
It is asymmetric
There are contention ratios, but it is less than ADSL
It is used by cable TV companies
Wireless
It uses mobile telephone networks
Can connect a laptop of PC by using:
Mobile phone internet connection sharing
Mobile broadband dongle
Mobile phone WiFi hotspots
It is asymmetric
It is dependant on availability of signal
Cost plans can vary
Unlimited
Per Mb downloaded
Leased Line
Point to point connection
Is expensive to install
No contention ratios
It is symmetric
So is useful for extranet access
Satellite
It is used in remote areas
Ships
Counrtyside
Desert
One way satellite
Satellite for dowload
Telephone for upload
Two way satellite
Uses satellite for both upload and download
Asymmetric
Geosynchronous satellite
Latency of about 0.7 seconds
OK for standard apllications
Problematic for interactive apllications
Line of sight is required
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