A.SGSN B.HLR C.GGSN D.DNS
A.Radius Server B.Wap Gateway C.Wap网站服务器 D.GGSN
A.GGSN B.PCU C.SGSN D.DNS
A.IDLE B.ACTIVE C.INACTIVE D.ALIVE
A.4dB B.8dB C.11dB D.6dB
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