VPN缩写的意思

DFSK CSE NDS GPS DVC UMTS ASC Bps APADAS SSM NCBA EFCI SSG CTDM DVVI S3 QDOS DCN ASI DS EAF GIMM ESC DPON MADP EEROM ppm FCN AJG DCT CAI AFC EELS STB SOC GDPS mcu AP DFOS CRC FED RAID RIP CC APARS DTD EF DTP DL ETE CICS SFB IS-IS ABDL CPS CNCC CPM IOB EWT IM