作為 ITU-T T.120 多媒體數(shù)據(jù)會議一致的網(wǎng)絡(luò)傳輸協(xié)議棧，T.123 引入的X.224 class 0 傳
輸協(xié)議嚴格限制其下層必須采用可靠的網(wǎng)絡(luò)服務(wù)。這限制了不可靠網(wǎng)絡(luò)協(xié)議及安全協(xié)議在數(shù)據(jù)會議中的使用。本文討論了在X.224 class 0 基礎(chǔ)上采用協(xié)商機制的可擴展連接模型，并就其協(xié)商連接的方式和性能進行了剖析和評估，借以推廣和拓展數(shù)據(jù)會議系統(tǒng)在安全及不可靠數(shù)據(jù)傳輸協(xié)議應(yīng)用等方面的研究。
關(guān)鍵詞: 可擴展傳輸連接連接協(xié)商協(xié)議（CNP） 多媒體數(shù)據(jù)會議 T.123/X.224
Analysis and Estimation of Transport Connection Extensible Mechanism in T.120 Data Conference Abstract: As the relible network transport protocol stack of ITU-T T.120 multimedia data conference, X.224 class transport protocol introduced in T.123 restricts that the underlie layeres must provide relible network service, which makes limition on the use of unrelible network and secure protocol in data conference. This paper discusses the extensible connection model based on negotation, analysises and estimates the method and performance of the negotation connection to expand the use of sercure and unrelible data transport protocol in data conference.

Keyword : Extensible Transport Connection, Connect Negotation Protocol. Multimedia Data
Conference. T.123/X.224