In the Stage of R4, ATM and IP become main medium of circuit switch instead of TDM, which make codec modes of core network more agility.
在R4阶段，ATM和IP承载渐渐取代TDM承载成为电路域的主要传播媒介，这两类传输媒介的引入使得核心网采用的编解码方式更加的灵活。
This article analyses the features of voice technology in ATM, Frame relay and IP network. The technical factors should be considered as you design an integrated voice and data network.
分析atm、帧中继和IP在话音技术方面的各自特点，提出在设计一个集成化的话音和数据网络时应注意的技术因素。
In order to run IP on an ATM-based network, new protocols are developed. However, these protocols have not yet been subjected to a thorough security analysis.
为了在AT M网上实现IP传输，人们提出了一些新的协议，但这些协议本身的安全性还没有进行深入地了解和验证。
To adapt to the broadband and packetized network development trend, the digital SPG switching paradigm in PSTN should be gradually evolved to a combined ATM and IP service switching platform.
为了适应网络宽带化、分组化的发展趋势，PSTN中的数字程控交换要逐步演进为包含ATM交换和IP功能的综合业务交换平台。
To adapt to the broadband and packetized network development trend, the digital SPG switching paradigm in PSTN should be gradually evolved to a combined ATM and IP service switching platform.
为了适应网络宽带化、分组化的发展趋势，PSTN中的数字程控交换要逐步演进为包含ATM交换和IP功能的综合业务交换平台。
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