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IP技术的飞速发展给接入网提出了新的课题。目前,话音和数据流量几乎部是通过TDM电路交换网络来传送的,随着IP技术在网络架构中的地位逐渐明晰,话音和数据组成的TDM话务量将通过IP网络来传送。从传统来说,E1/T1是通过SONET/SDH或ATM骨干网传送的,但是目前因为许多运营商希望将他们的网络转变为IP网络,传统的TDM信息流向高性能分组主干网迁移已经成为潮流。采用TDM over IP不但可以提供极佳的话音质量,而且还可以保留现有的PBX系统特征,可以各种速率支持Modem、传真和视频。因此,TDM overIP成为日前接入网发展的新走势。
The rapid development of IP technology to the access network proposed a new topic. At present, most of the voice and data traffic is transmitted through the TDM circuit switched network. With the gradual clarification of IP technology in the network architecture, TDM traffic consisting of voice and data will be transmitted over the IP network. Traditionally, E1 / T1 was delivered over SONET / SDH or ATM backbones, but as many operators now want to turn their networks into IP networks, the migration of traditional TDM traffic to high-performance packet backbones has become a trend . Using TDM over IP not only provides excellent voice quality, but also retains existing PBX system features and supports Modem, fax and video at all speeds. Therefore, TDM overIP has become a new trend of access network development.