Cellular Radio, Isdn Networks And Satellite Communications

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networks for these services.

3. What is Satellite Communications?
This is the use of orbiting satellites to relay microwave transmissions from earth stations to the satellite an to re-transmit those signals back down to another earth station by means of microwave transmission.
Cellular Radio
At present there are two types of cellular radio systems in operation in Ireland. These are:
1. TACS
This system is an analogue system in which the voice is transmitted by radio from the telephone to the nearest base station in analogue form. Analogue systems are at present throughout the world but each Country would have different standards. So a user can not use the phone in a different country, also as the signal it transmits is in analogue form the calls can be monitored quite easily with the help of a scanner. America’s version of analogue cellular radio is called AMPS (Advanced Mobile Phone System).

2. GSM (Global System for Mobiles)
GSM is a more recent technical ...

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the cellular mobile telephone system. The way it works is that the area of coverage, e.g. Ireland would be divided into areas called cells (cellular) each cell would have a low power radio transmitter and receiver. This is called a base station. There is normally one base station in a cell although the cell can be subdivided to give better coverage to a densely populated area, such as Dublin.

When a mobile phone is in a cell it transmits and receives radio signals from the base station in the cell. As the base station is a low power transmitter, the radio signal would be weak. This is so that the radio signals are not picked up if they are out side the area of the cell. Each ...

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