ADSL (Asymmetric Digital Subscriber Line)
- Uses range of frequencies on existing copper telephone cable. Asymmetrical means not symmetric as the download path has a larger range of frequencies than the uploading path.
- Largest range of frequencies for download; Downloading has higher bandwidth than upload; Quicker to download a file than upload a file; Typical bandwidth = 4, 8, 20, 24 Mbps
- Factors affecting bandwidth: Distance from exchange; Interference from AM radio; Other devices connected to phone line; Electrical interference
- Always-on Internet Access; Used in homes
- Problems in business: Contention ratio (see bottlenecks in 3d); Low upstream bandwidth
Cable (i.e. Cable Television) – broadband internet access can be provided by cable TV
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