The Global System for Mobile communication has greater significance compared to other standards due to its permission for international roaming, high signaling quality as well as its eminence in speech channels. As a mobile phone standard, it provides benefits of some cost-effective facet such as the Short Message Service (SMS). Besides, most operators have the advantage of procuring easily available equipments to set up a network. Roaming is certainly a supreme feature considering subscribers can enjoy using their phone throughout the whole world.
On how GSM made its way into the telecommunication market, it began during the early 1980s where the demand for technological standardization incurred. There were various associations who started developing mobile standards, especially those to be used within Europe countries. Later on, the development tasks were spread to other institutes and by 1991; the network was officially launched. It was considered to be a cellular network that functions on a specific basis. Mobile phones linked to the network will search for cells in the vicinity.
There are four range of frequency for the Global System for Mobile communication standard. The regular ones are 900 MHz and 1800 MHz where they are divided into various channels and each channel having a timeslot. The cell sizes of the network are categorized as macro, micro, Pico and umbrella. The cells coverage depends on the environment where they have been set up. Macro cells involve a base station antenna on top of a building’s roof while micro cells involve antennae below the roof top and they are often used in the urban regions. Pico cells are broadly used indoors as their coverage diameter is only within few meters. Umbrella cells are usually used to fill the opening between other coverage cells.
If you look into the network structure of GSM, there are generally three structures. The base system or station will store and maintain information. The GPRS will allow internet connectivity in packet forms while the Network and Switching Subsystem will permit the transmission of data and supervise the communication between the networks.
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Automatic shot test with the Pic24 PTP USB host. Shot has been triggered by the new laser beam detector, as the beam has been broken by the sim card.
Focus : Manual.
Shooting Mode PC Control (aka Pic24 PTP USB host"
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