GSM: BSS (Base Station Subsystem) Interfaces
Within the BSS, the user- and signalling data is transported over a series of interfaces. The A interface connects the Mobile Services Switching Center (MSC) with the Transcoder TC. The A-ter interface connects the Transcoder with the Base Station Controller (BSC). The A-bis interface connects the BSC with the Base Transceiver Station (BTS). Finally, the data is transmitted to the mobile station via the air interface Um.

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