作為 ITU-T T.120 多媒體數據會議一致的網絡傳輸協議棧，T.123 引入的X.224 class 0 傳
輸協議嚴格限制其下層必須采用可靠的網絡服務。這限制了不可靠網絡協議及安全協議在數據會議中的使用。本文討論了在X.224 class 0 基礎上采用協商機制的可擴展連接模型，并就其協商連接的方式和性能進行了剖析和評估，借以推廣和拓展數據會議系統在安全及不可靠數據傳輸協議應用等方面的研究。
關鍵詞: 可擴展傳輸連接連接協商協議（CNP） 多媒體數據會議 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