GSM (Geser Sedikit Mati/Groupe Spécial Mobile/Global System for Mobile communication)
What is GSM? GSM is Global System for Mobile communication it’s a global standarditaion for digital mobile communication. Actually the GSM name is a group for standarditaion that built at Europe in 1982 to standardizing mobile cellular phone at Europe that operated on 900MHz frequency. GSM itself is originally abbreviation of Groupe Spécial Mobile.
There is 3 variant of GSM based on frequency band.
- GSM900, work on 900MHz
- GSM1800, work on 1800MHz
- GSM1900, work on 1900MHz
Below is structure of GSM network
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