"If it comes down a telephone line, it isn't fibre optic broadband"
Chris Condor MBE, B4RN
- Digital Subscriber Line (DSL) is a technology that delivers broadband over your phone line to be used in the home or office.
- With DSL technology, large volumes of information are sent over a copper cable at rapid speeds.
- DSL allows you to download web pages, text, graphics, music and video in real time.
- Asymmetric Digital Subscriber Line (ADSL) is a technology similar to the DSL technology.
- With ADSL, information is downloaded more rapidly than it is uploaded.
- ADSL is particularly useful for homes and businesses as it can download web pages and files at fast speeds.
- ADSL2 and ADSL2+ are new technologies offered by some providers offering speed up to 24Mbps. One provider offering this service is Be.
Symmetric Broadband (SDSL)
- Symmetric broadband (SDSL) is a technology similar to ADSL broadband.
- SDSL broadband downloads information at the same speed as it uploads information. Whereas ADSL broadband downloads the information faster than it uploads it.
- This type of broadband requires an extra telephone line.
- SDSL broadband is particularly suitable for businesses that send large volumes of information.
Local Loop Unbundling
- Local Loop Unbundling (LLU) is where ADSL or SDSL broadband technologies are provided without using the British Telecom’s exchange system.
- This means that LLU providers can offer broadband features at a competitive price.
- LLU is only available in certain parts of UK. Providers include Bulldog and Be.
- There are several ways in which broadband can be delivered to your PC, this type of broadband is delivered through a cable.
- Cable companies also offer television and telephone packages as well as broadband Internet services.
- Cable companies provide broadband, television or phone packages to about 45% of homes and businesses in the UK.
- You can only get cable broadband if a company has cabled your street.
- Cable providers include ntl.
- There are several ways in which broadband can be delivered to your PC,PC; this type of broadband is delivered through a satellite.
- To receive satellite broadband you must have a dish antenna, and can be used almost everywhere in the UK.
- There are 2 types of satellite services:
- One-way satellite services download information via satellite and upload information via a telephone or IDSN line.
- Two-way satellite services download and upload information via satellite. This provides an even higher bandwidth and a faster speed.
- Satellite transmission may be affected by weather conditions.
- The cost of installing and running satellite broadband can be quite expensive compared with other types of broadband.
- Satellite broadband generally has quite high latency (ping times) compared to other broadband, and so is unsuitable for certain types of Internet Access such as online gaming.
- Wireless broadband is one of the ways in which broadband can be delivered to your PC.
- This type of broadband requires an antenna to be installed to get connection to the Internet.
- Wireless broadband is particularly suitable for distributing information between buildings and for homes where access to ADSL or cable broadband is unavailable.
- Mobile broadband is a newer addition to the broadband market, only arriving in recent years following the sale of spectrum to mobile network companies.
- Mobile broadband users receive a broadband connection over the mobile phone networks via 3G and 4G technologies, removing the requirement for a fixed broadband connection or a phone line.
Fibre Optic Broadband
Unlike the majority of broadband connections in the UK, which use telephone lines or mobile networks, fibre-optic broadband is transferred along special cables under the ground. The signals move a lot faster than they do along copper cables and offer speeds of up to 300Mbps +. A good example of a wholly fibre optic broadband network is the B4RN project.