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CAPTAIN(Character A Pattern Telephone Access Information Network)
DATA Åë½Å(DATA Communication)
INS(Information Network System)
ADSL (Asymmetric Digital Subscriber Line) : ºñ´ëĪ µðÁöÅÐ °¡ÀÔÀÚ È¸¼±
ISDN¿¡¼ÀÇ Packet Communication
°³ÀÎÅë½Å¸Á(PCN : Personal Communication Network)