![]() ![]() It uses frequency division duplex (FDD) that divides the channel into several sub-bands. GSM runs on a range of frequencies including 900, 18 MHz. It is also called the UM interface as it is analogous to U interface of ISDN. It is a removable chip that contains account information of the subscriber and connects the handset to the mobile network system.Īir Interface : The air interface is the interface between the mobile station and the Base Transceiver Station. SIM stands for SubscriberIdentity Module. The mobile handset comprises of the transceiver, the display and its processor. Mobile Station : The mobile station is the mobile phone, which comprises of the mobile handset and SIM card. Global System for Mobile communication (GSM) architecture comprises of the following components −
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