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7788763
3j Broadband
Description
A level, A2 IT (Chapter 3) Mind Map on 3j Broadband, created by Gladys Mba on 21/02/2017.
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ict
it
ocr
alevel
a2
chapter 3
it
chapter 3
a level, a2
Mind Map by
Gladys Mba
, updated more than 1 year ago
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Created by
Gladys Mba
over 7 years ago
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Resource summary
3j Broadband
Asymmetric Digital Subscriber Line (ADSL)
Uses existing copper telephone line
Small amount of frequency left for phone call, some for upstream and more for downstream
O- Used in homes as no extra cable installation is needed
Asymmetric with downstream having the greater bandwidth as it is used for downloading more.
X- Not suitable for businesses which upload more
X - Need to be close to a telephone line
X - Electrical interference and other devices such as fax machine may reduce bandwidth
X- Distance from telephone exchange, and interference from AM radio stations can decrease bandwidth.
Cable
Provided by cable TV companies
O- Mainly fibre optic -higher bandwidth available
Asymmetric
50Mbps downstream for businesses (20Mbps for homes)
X- Maybe a bottle neck in the fibre optic cable connecting a street's switch to the ISP, where many households are using the same cable.
Wireless
3G can provide 14.4Mbps downstream and 5.8Mbps
4G (LTE) can provide 8-30 Mbps
Used for mobile devices, enables video calls and high bandwidth internet
X- Requires a good signal
Leased Line
Only between two locations
O- No connection ratios and guaranteed bandwidth
X- Very expensive, installed just for organisation
Symmetric
e.g. "Grid for Learning"
Satellite
Used in remote area with no physical/wireless connections
Two-way satellite broadband allows downloading and uploading of data through satellite connection. One-way needs a telephone line to upload.
Uses Geosynchronous satellites about 37,000km above the earth. Latency of about 0.7 between data being sent and received.
X- Impractical for interactive applications e.g. online gaming/ video conferencing
X- Line of sight required
Asymmetric: upstream and down stream have different bandwidth
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