케이티(KT) - 시험문제

1982—1991: Starting PC communication service, HiTEL


January 1, 1983: First installation of Korean-made DDD-type public telephones

August 1, 1983: International Subscriber Dialing (ISD) service started

April 25, 1984: TDX-1, fully digitized telephone switching system, developed

July 25, 1984: Packet-exchange air data network opened

October 29, 1984: Kwanghwamun Telecommunication Center, the previous headquarters of KT, completed

From http://en.wikipedia.org/wiki/KT_(telecommunication_company)