摘要:PTN(Packet Transport Network)是一种以分组作为传送单住,承载电信级以太网业务为主,兼容TDM、ATM等业务的综合传送技术。PTN技术基于分组的架构,继承了MSTP(Multi-ServiceTransferPlatform,多业务传送平台)的理念,融合了Ethemet和MPLS(Multi-protocol Label Switch,多协议标签交换)的优点,是下一
To measure elastic wave velocities in rocks at high temperature and high pressure is an important way to acquire the mechanics and thermodynamics data of rocks