以太网

This print connects IP to bear the weight of to Chinese net the detailed report of net building, push net of telegraphic class aether to strengthen to Hua Weixin edition those who undertake is timely dog, the deploy of net of aether of telegraphic to British telecommunication class is carried out, and the dialog of the chief inspector of research and development with balefire network, will conduce to solve industry a variety of problems to net of telegraphic class aether.

本刊对中国网通IP承载网建成的具体报道，对华为新推电信级以太网加强版进行的适时跟踪，对英国电信电信级以太网的部署实践，以及和烽火网络的研发总监的对话，都将有助于解决业界对于电信级以太网的种种新问题。

As an important part of industrial Ethernet, the industrial Ethernet intelligent control node directly influences the instantaneity ,reliability and other qualities of industrial Ethernet according to its well or bad performance.

摘要工业以太网智能控制节点是工业以太网的重要组成部分，其性能的好坏直接影响到工业以太网的实时性、可靠性等性能。

Robert metcalf says that if something comes along to replace ethernet, it will be called "ethernet", so therefore ethernet will never die.

robert metcalf说过，如果出现了能够替代以太网的东西，它就将叫做"以太网"，从而以太网永远不会消亡[4]。

Robert metcalf says that if something comes along to replace ethernet, it will be called "ethernet", so therefore ethernet will never die.[4] unix has already undergone several such transformations.

robert metcalf说过，如果什么会在将来替代以太网，它就叫做"以太网"，因此以太网将永远不回消亡[4]。unix也已经经历过了几个这样的转变。

Robert metcalf says that if something comes along to replace ethernet, it will be called "ethernet", so therefore ethernet will never die.④ unix has already undergone several such transformations.

robert metcalf说，如果有什么东西涌现出来代替掉以太网的话，那玩意儿就会被叫做"以太网"，所以以太网永远不会消亡④。unix早已经经历过若干次这样的转化了。

According to the demanding of network support system in the domain of industrial control, and referring to the design principle of commercial Ethernet, this paper designs structure of industrial Ethernet which is based on delaminated structure and afford a communication platform which is secure and stabile and mutual operation for industrial control system, at the same time designs a remote monitor system of industrial Ethernet which is based on Internet.

根据工业控制领域对网络支持系统的要求，借鉴商业以太网的设计原则和方法，设计了基于分层结构化工业以太网结构，拟为工业控制系统提供了一个安全、稳定、互操作性好的通信平台；同时，按照该设计思路和原则，本课题设计了一个基于Internet的工业以太网远程监控系统。

The application of industry Ethernet control system has realized the integrating of enterprises control system and the management information system without has carried aperture. The embedded web Ethernet control system based on TCP/IP protocol is run through each level of the control system. As a network node, the equipment on the spot, equipment engineer and enterprise administrative staff are linked through Ethernet and form an organic whole .

工业以太网控制系统的应用实现了企业控制、管理信息的无缝集成，嵌入式web以太网控制系统基于TCP／IP贯穿于控制系统各个层次，将孤立的现场设备和设备工程师以及企业管理人员均作为一个网络节点通过以太网有机连接在一起，形成一个有机的整体。

Its complete product line, fiber-optic network, both external power supply type also has built-in power type, both stand-alone also has the standard 19 rack-mount products, covering Ethernet, Fast Ethernet, Gigabit Ethernet and ATM network used in fiber-optic transceivers, fiber optic switches and fiber optic modems and other equipment. early in 1999, netLINK first time in Greater China to launch a technology leader in the industry have the adaptive function of 10/100 Fast Ethernet Media Converter (HTB -1100 series), and its excellent cost performance by customers. October 24, 2001 to 27 in Shanghai 2001 International Electronic Products Exposition and fifty-eighth session of Electronics Show , the Haitong exhibited Netlink Technologies Limited and the exclusive agent of Nufiber company, CTS Corporation a full range of fiber-optic network products, as well as Intelligent Network standard 16-slot rack-mount fiber optic media converter, RS-232/422/485 up mode / single-mode fiber converter and other new products, attracted the attention of the industry and well received by the audience and the fiber-optic network customers.

其光纤网络产品系列齐全，既有外置电源型也有内置电源型，既有独立式也有标准19机架式产品，涵盖以太网、快速以太网、千兆以太网和ATM网络用的光纤收发器、光纤交换机及光纤数据机等各种设备。1999年初，netLINK首先推出当时在大中华区业界处于技术领先的有10/100自适应功能的快速以太网媒体转换器（HTB-1100系列），并以其优异的性能价格比广受客户的欢迎。2001年10月24日至27日在上海举行的2001国际电子产品博览会和第五十八届电子产品展览会上，海通科技有限公司展出了netLINK和独家代理的Nufiber公司、CTS公司全系列的光纤网络产品以及智能网管型16槽标准机架式的光纤媒体转换器、RS-232/422/485至多模/单模光纤转换器等新产品，深深吸引了业界的注意和广受观众和光纤网络客户的欢迎。

Synchronization in Ethernet networks could be done using shorter preambles if there were only twisted pair cables; but since the standard was made for coaxial cables, the preamble needs to be longer because the first transmitted bytes of a frame are damaged on a coaxial cable.

如果以太网中只是用双绞线互联的话，以太网的同步可以使用更短的前导码；但是因为以太网标准是因同轴电缆而定义的，前导码需要更长，因为在同轴电缆上，一个frame中刚开始发送的几个字节是会被破掉的（这里很奇怪，难道同轴电缆在发送有效的信号的时候，刚开始的数据是有损的吗？

In High-avail, made a concept of Redundancy Manager, and put forward some ethernet ring structures on the base of it. We can find these meet different levels of Avail requirement. In Real-time, it made great improvement on traditional ethernet. Adopted switch technology, high-speed ethernet, full-Duplex port switch, data prioritisation, and VLAN technology.

在高可靠性方面，提出了冗余管理器的概念，在它的基础上形成的几种以太网环网结构，可以满足不同层次的可靠性要求；在实时性方面，对传统以太网加以改进，采用了交换技术、高速以太网技术、全双工端口交换的方式、优先级标志技术、虚拟网技术等新技术。

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。