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STM is used for backbone networks to transfer packetized voice and data across long distances. It is a circuit switched networking mechanism, where a connection is established between two end points before data transfer commences, and torn down when the two end points are done. Thus the end points allocate and reserve the connection bandwidth for the entire duration, even when they may not actually be transmitting the data. The way data is transported across an STM network is to divide the bandwidth of the STM links (familiar to most people as T1 and T3 links) into a fundamental unit of transmission called time-slots or buckets.