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6481)   1999-10-26   PDD, 다이얼후 접속지연, Post Dailing Delay
6482)   1999-10-23   이상고장, 대형고장
6483)   1999-10-11   PMUX, P-MUX, Primary MUltipleXer
6484)   1999-10-02   호 특성표, Call Mix Table
6485)   1999-10-02   T-S-T 방식, Time-Space-Time
6486)   1999-10-02   PR, 정보료회수대행서비스, 정보료수납대행서비스, Premium Rate Service
6487)   1999-10-02   SMDS, Switched Multi-mega Data Service
6488)   1999-10-01   Internet2, 인터넷2, Internet 2
6489)   1999-09-30   X 시리즈, X 시리이즈, X 계열, X Series
6490)   1999-09-22   NUA, Network User Address
6491)   1999-09-21   X.3, X.3 (ITU-T)
6492)   1999-09-21   X.32, X.32 (ITU-T)
6493)   1999-09-21   X.75, X.75 (ITU-T)
6494)   1999-09-21   DNIC, 데이타망 식별번호, Data Network Identification Code
6495)   1999-09-17   TCBH, Time-Consistent Busy Hour

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