PTN

Discussion on PTN Strategy in Metro Area Network

分组传送网技术在城域网中的应用探讨

Traditional networks can not satisfy the rapid development of business requirements, if the IP to the traditional telecommunications network is a kind of subversion, then the PTN it is that the subversion of the most important thing a gravel road.

传统网络越来越不能满足迅猛发展的业务需求，如果说IP对于传统的电信网是一种颠覆，那么PTN就是这条颠覆之路上最重要的一粒石子。

If considering transmitting the traditional TDM services over the PTN, we must consider the distribution of synchronization timing information over the PTN.

如果考虑在PTN网络上传送传统TDM业务，必须考虑PTN网络中同步定时信息分配问题。

The simulation results show it can improve the computational efficiency of PTN mesh topology design.

模拟仿真结果表明，该算法有效地提高了设计满足业务需求PTN网状网拓扑的计算效率。

According to the time synchronization protocol test result of PTN, PTN-E and SDH, the article proposes the optimal standard of the time bearer network.

针对PTN、PTN-E、SDH等不同场景下的时间同步协议实际测试结果，提出了时间承载的最优网络制式。

Therefore, the introduction of PTN technology provides a platform for carrying MAN multi-service.

因此引入PTN技术为城域网多业务的承载提供了平台。

Application Expectation of Carrier Ethernet Supported by PTN in Power System Communication

PTN支持下的电信级以太网在电力系统通信的应用前景

The test equipments of PTN device rely on precise clock synchronization technology to support the implementation of input and output data analog for time-division multiplexing services.

PTN网络测试设备在实施时分复用业务数据输出模拟时，需要依靠精确的时钟同步作为技术支撑。

The thermal decomposition characteristics of trimethylolpropane trinitrate ( TMPTN ) were investigated by means of high pressure DSC.

利用高压DSC研究了三羟甲基丙烷三硝酸酯 ( TMPTN ) 的热分解特性.

Spinal cord evoked potential ( SCEP) elicited by posterior tibial nerve ( PTN) stimulation was recorded with surface bipolar electrodes placed over the regions corresponding to the lumbosacral, thoracic and lower cervical spine in 16 normal children and 43 children with cerebral palsy ( CP).

采取刺激后胫神经（PTN）诱发叠加技术，利用体表无创伤性双极记录方法观察了16例正常小儿和43例脑瘫小儿的脊髓诱发电位（SCEP）。

Conclusions CT-guided selective radiofrequency thermocoagulation is a safe, simple, and effective option for the treatment of PTN, especially suitable for the elderly and high-risk patients.

结论CT定位选择性三叉神经半月节射频热凝术治疗原发性三叉神经痛安全简便，疗效可靠，并发症少，尤其适用于高龄或不能耐受开颅手术的病人。

Objective To study the characteristics and clinical significance of posterior tibial nerve-somatosensory evoked potential ( PTN-SEP) in children with tethered cord syndrome ( TCS).

目的研究脊髓栓系综合征（TCS）患儿胫后神经体感诱发电位（PIN-SEP）改变特点，探讨其临床意义。

These for future large-scale construction of PTN and application has the very vital significance.

这些对于今后PTN的大规模建设和应用具有十分重要的意义。

Conclusion Depression of GABA receptor counts be one of important cause of PTN.

结论γ-氨基丁酸受体量减少是引起原发性三叉神经痛的重要原因之一。

Research and Produce of PTN New Kind of Joint Material for Canal

PTN新型渠道接缝材料研制

Then PTN networking and planning techniques are analyzed such as networking strategy, network management solution, VLAN and IP address allocation, quality of service issues, and timing clock solutions.

然后分析给出了PTN组网和规划技术，包括组网策略、网管规划、VLAN及IP地址规划、业务及服务质量规划和时钟同步规划等。

Methods Patients with tethered cord syndrome underwent posterior tibial nerve somatosensory evoked potential study ( PTN-SEP) and motor conductive velocity study of the posterior tibial and common peroneal nerves ( MCV).

方法对TCS患儿组及对照组行胫后神经体感诱发电位（PTN－SEP）、胫后神经及腓总神经运动神经传导速度（MCV）检测。

Timing information distribution over the PTN can use the external clock synchronization, Synchronous Ethernet Technology or packet-based Adaptive Clock Recovery ( ACR).

实现分组传送网络定时信息分配可以采用外部时钟同步法、同步以太技术或数据包方式的自适应时钟恢复算法ACR（Adaptive Clock Recovery）。