Please write some of the key features of GSM cellular networks.

Hi all! I have lost all hope but I believe this forum can help me. My question is that What are the key features of GSM cellular networks? Elaborate it in the context of Data Communication.
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"Fully Digital System --- TDM over FDM Working at 1.8GHz and 1.9 GHz --- Antenna Size 4cm (λ /4) Phones are dual band --- work on both 800MHz and 1.8, 1.9GHz 200KHz Channel Voice signal picked up by microphone Digitized Compressed (1:8) Eight users share a single frequency. Source: http://in.docsity.com/en-docs/VRC__Parity_Check__Error_Detection__Hamming_Distance-Wireless_Networking__LAN_and_Computer_Networks-Quiz_Solution_"
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"GSM (World-wide Technique regarding Cellular Sales and marketing communications, originally Groupe Spécial Cellular), can be a standard collection produced by the eu Telecoms Specifications Bring (ETSI) to spell it out practices pertaining to next technology (2G) a digital cellphone systems utilised by mobile phones. "
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