以太网

An original local area network invented by a company called Fox Research, Dayton, OH. 10-Net is a baseband, Ethernet CSMA/CD peer-to-peer LAN running on one twisted pair at one megabit per second.

最初的局域网是由一个叫Fox Research， Dayton， OH的公司创建的。10-Net是一个基带，以太网CSMA/CD对等局域网，在一股双绞线上以1Mbps的速度传输的。

NetAn original local area network invented by a company called Fox Research, Dayton, OH. 10-Net is a baseband, Ethernet CSMA/CD peer-to-peer LAN running on one twisted pair at one megabit per second.

最初的局域网是由一个叫Fox Research， Dayton， OH的公司创建的。10-Net是一个基带，以太网CSMA/CD对等局域网，在一股双绞线上以1Mbps的速度传输的。

The paper firstly introduces the background, the present situation and meaning of the research on the embedded system. The research of key technologies of embedded ethernet remote measure and control system is carried out in this paper. Then the author detailedly illustrates the design process of hardware and software of the embedded remote measure and control system. The design process includes the selection and configuration of the 32-bit microprocessor, the selection of the memorizer, the selection and software design of the Ethernet Controller, the realization of AD data acquisition model and DA converter model.

本文论述了嵌入式系统的研究背景、研究现状及研究意义，对基于嵌入式技术的以太网远程测控系统关键技术进行了研究，详细介绍了系统的软硬件设计过程，包括32位微处理器的选择与配置、存储器的选择、网络控制器的选择及软件设计、AD采样模块与DA数模转换模块等外围电路的实现。

A novel shared memory switch architecture is proposed in order to adapt to SDH and ethernet network's multiple transport speed structures.

针对SDH和以太网两种不同的传输等级，提出了一种新的多速率的共享存储器交换结构。

Since the time of Robert Metcalf, a need has arisen to incorporate priorities into the Ethernet system so that packets of lesser importance will not impede packets of greater importance.

从罗伯特Metcalf 的时期，需要出现合并优先权以太网系统以便小包一点重要不会妨碍重要性小包。

Test result showed that the arithmetic satisfied the EPA protocol and the scheduling precision could reach the microsecond level.

测试结果表明，所提出的调度算法完全符合以太网协议规范，精度可达到微秒级。

The network transmission part is based on TI's TMS320C6000 series DSP and the Network Development kit.The Ethernet interface between DSP and computer cluster has been implemented and the test on the performance of the interface has been made. Furthermore, the relationship between the number of hydrophone sensor heads and the network bandwidth has been analyzed which leads to the method of how to calculate the minium bandwith of network given the scale of the hydrophone array.

网络传输部分以TI公司TMS320C6000系列DSP和NDK网络开发程序套件为基础，实现了DSP和集群系统之间水声数据的百兆以太网接口，进而对该网络接口的传输性能进行了测试，并分析了水听器探头数目和网络带宽的关系，得出了计算给定规模水听器阵列所需最小网络带宽的方法。

We also designed the timing circuit board to driver the MOSET and the network control system based on the probably fill mode in the future and the RF system of the storage ring in HLS. The high reverse overshoot exists in the current pulse with the pulse width of 60 ns. Further study is necessary to eliminate the reverse overshoot and to search the proper techniques on modulability of light pulse interval in HLS.

根据未来光源储存环可能的填充模式，以及光源储存环高频系统的特性，设计了MOSET开关驱动控制系统的时钟试验电路，和以太网控制试验电路，即将投入加工。60ns脉宽的脉冲电流，存在较大的反向过冲，需要进一步研究合适的反峰削除技术，以及可用于光源脉冲可调性的合适技术。

ELMO USA Corporation of Plainview, New York, has added power over Ethernet support to its ELMO TD4114IP II Day/Night network dome to eliminate the need for an external power source and reduce infrastructure requirements to a single cable.

美国ELMO USA Corporation新出的ELMO TD4114IP II昼/夜网络球机，添加了以太网供电支持，省去了外部电源并使基础设施要求减少到只需一根单缆。

The self-contained IP66-rated unit from ELMO USA Corporation of Plainview, New York, includes power over Ethernet support via the camera's existing CAT5 network connection.

ELMO USA Corporation 推出的ELMO SN2230IPII 昼/夜网络摄像机安装简单，还带有独立的IP66防护等级，现有的CAT5网络连接支持以太网供电。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。