GSM (Global System for Mobile communication) is a digital mobile network that is widely used by mobile phone users in Europe and other parts of the world. ... GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot.
GSM uses a variety of 'channels' in which the data is carried. In GSM, these channels are separated into physical channels and logical channels. The Physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel.
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