BPK RI Perwakilan Provinsi Sumatera Utara | BPK RI ......Switching Center (MSC), Base Station...
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BPK RI Perwakilan Provinsi Sumatera Utara | BPK RI ......Switching Center (MSC), Base Station Controller (BSC), Radio Network Controller (RNC) dan jaringan transmisi utarna (backbone