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Glass Fibre

This phone line can still be used for everything you did with before including voice, fax or modem. The only change made is that you get the additional service of ADSL delivered on the same wire.
             The technology used by ADSL combines voice and digital signals on the same phone line using the same wires. This is achieved by sending the digital data at frequencies that are not used in normal voice transmissions. To make this work there needs to be special splitters installed at both the telephone exchange and your computer. This is done to isolate the voice, which is analogue, and the digital signals.
             Another requirement is that at the exchange a DSLAM, short for DSL Access Multiplexor, needs to be installed. This is quite similar to a network hub where a number of incoming lines are combined into a single line, which is then connected into the main network infrastructure, and ultimately the Internet. .
             At you premises you need to split the signal into voice and data, something that is done by using a special filter that splits the digital information from the voice information. This is called a MicroFilter. The last thing needed is an ADSL modem and then you are ready to go on the Internet.
             1.3.2 How cable works.
             The implementation of cable broadband is the inverse of the ADSL implementation due to the fact that for ADSL the delivery method is over an analogue line, whereas for cable the delivery is over a digital line. Therefore when cable companies offer telephone services they have to convert digital to analogue.
             For cable Internet to work, TV channel space is used for data transmission, with certain channels used for downstream transmission and other channels for upstream transmission. As expected, there is more capacity allowed for downstream transmission than for upstream transmission. This is at the same time the reason why many cable Internet providers prohibit certain types of use that make heavy use of upstream capacity.


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