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Architettura di rete<br />
User<br />
terminals<br />
GSM/GPRS<br />
terminal<br />
<strong>UMTS</strong><br />
terminal<br />
GSM/GPRS<br />
terminal<br />
Radio Access<br />
Network<br />
BTS BSC MSC GMSC<br />
Node B RNC<br />
UTRAN<br />
Core Network<br />
Traffico vocale<br />
SGSN<br />
HLR<br />
Traffico dati<br />
GGSN<br />
Internet<br />
PSTN
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