同步以太网测试方法

得益于移动宽带业务的强劲增长,许多移动网络运营商已经或正在把移动回传网络从传统同步传输(如SONET/SDH和T1/E1)迁移到运营级以太网。传统TDM网络不仅提供数据传输,而且能实现频率同步。这样,原来由TDM网络提供的时钟同步也同样必须在以太网络中实现,并且同步的质量和网络性能不能受到影响。再者,3G/LTE无线网络不仅需要频率同步,还需要时间/相位的同步。所以,在部署前对以太网络各个部件作同步性能的验证就显得非常必要。本文介绍了实现以太网同步的各种方式和原理、同步精度测量面临的挑战。结合IXIA业界领先的同步测试工具Anue 3500,重点对PTP技术中的路径支持设备(如边界时钟和透明时钟)的测试方法进行了探讨。

Testing PTP / IEEE1588 On-Path Support Devices

As the demand for advanced mobile broadband services continues to increase, many network providers and carriers are migrating their mobile backhaul networks from legacy synchronous transports such as SONET/SDH and T1/ E1 to Carrier Ethernet. Traditional TDM networks provided not only data transport, but also synchronization of frequency. Synchronization equivalent to what has been provided for TDM networks must be provided on Ethernet networks in order for Ethernet to be used as a replacement for TDM. This must be done without impact to synchronization quality and network performance.Equipment manufacturers must test their equipment prior to presenting it to their customers, the network operators and service providers. Vendors of Ethernet hardware and silicon solutions （PTP-enabled Ethernet PHYs, PTP protocol stacks, etc.） must also test their equipment in order to sell to the equipment manufacturers.