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GSM Services
Telephony is the most basic teleservice supported by GSM. Speech is digitally prearranged and transmitted through the GSM network in the form of digital stream like all other communications. It also provides an emergency service where the nearest emergency-service provider is reported by dialing three digits. By using a variety of access methods and protocols such as X.25 or X.32, GSM users can send and receive data at rates 9600 bps to users on POTS, ISDN, Packet Switched Public Data Networks and Circuit Switched Public Data Networks. A modem is not required between the user and GSM network because GSM is a digital network.

Short Message Service (SMS) is a unique feature of GSM. SMS is a dual directional service for short alphanumeric up to 160 bytes messages. In a store-and-forward fashion messages are delivered. A message can be passed to another subscriber to the service and an acknowledgement of receipt is provided to the sender for point-to-point SMS. For sending messages such as traffic updates or news updates SMS can also be used in a cell-broadcast mode.

GSM Frequency Ranges
There are four main GSMs versions exist based on the band used: GSM-900, GSM-1800, GSM-850 and GSM-1900.
1)GSM-900 makes use of 890-915MHz to send information and 935-960MHz to receive information.
2)GSM-1800 makes use of 1710-1785MHz to send information and 1805-1880 to receive information.
GSM-1800 is called as Digital Cellular System (DCS) and it is commonly used in Personal Communications Network. GSM-1900 is called as Personal Communications Service (PCS-1900). PCS-1900 standards are integrated with that of GSM/DCS specifications resulting in a specification for GSM/DCS/PCS based on the Release 98 Series of GSM Specifications.

E-GSM, the extended GSM make use of uplink frequency range 880MHz - 915 MHz and downlink frequency range 925MHz - 960MHz. The GSM specifications also define railways GSM (R-GSM) which make use of uplink frequency range 876 MHz - 915 MHz and downlink frequency range 921MHz - 960 MHz. All these specifications are called as GSM-900.

A microstrip antenna system having a GPS antenna for receiving GPS data and a telemetry antenna for transmitting telemetry data mounted on a dielectric substrate. The microstrip antenna system is designed for use on small diameter airborne projectiles which have a diameter of about 2.75 inches. A filter is integrated into the antenna system to isolate the transmitted telemetry signal from the received GPS signal.

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vehicle tracking system is an electronic device installed in a vehicle to enable the owner or a third party to track the vehicle's location. Most modern vehicle tracking systems use Global Positioning System (GPS) modules for accurate location of the vehicle. Many systems also combine a communications component such as cellular or satellite transmitters to communicate the vehicle’s location to a remote user. Vehicle information can be viewed on electronic maps via the Internet or specialized software.
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