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【速搜问答】专用数据网是什么

问答 admin 4周前 (04-10) 25次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

专用数据网是指为满足自身需要而由企业、组织或部门建立、拥有、管理和使用的数据网。针对性强、传输质量好、保密性强、建设周期短,虽然利用率不如公用网高,它适用于某些特殊需要的部门,如军队、公安以及铁道等。

Private data network refers to the data network established, owned, managed and used by enterprises, organizations or departments to meet their own needs. Although the utilization rate is not as high as public network, it is suitable for some departments with special needs, such as military, public security and railway.

专用数据网是指为满足自身需要而由企业、组织或部门建立、拥有、管理和使用的数据网。

Private data network refers to the data network established, owned, managed and used by enterprises, organizations or departments to meet their own needs.

定义

definition

所谓专用数据网是指针对某一个或者若干个大的团体、部门的需要而设计的,所有权也属于这个团体或部门的网络。例如,气象网就是典型的例子。专用数据网针对性强、传输质量好、保密性强、建设周期短,虽然利用率不如公用网高,它适用于某些特殊需要的部门,如军队、公安以及铁道等。总之,公用数据网和专用数据网是相辅相成的,应当协调发展。

The so-called private data network refers to the network designed for the needs of one or several large groups or departments, and the ownership also belongs to this group or department. For example, the weather network is a typical example. Private data network has strong pertinence, good transmission quality, strong confidentiality and short construction period. Although the utilization rate is not as high as public network, it is suitable for some departments with special needs, such as military, public security and railway. In a word, public data network and private data network complement each other and should be developed coordinately.

专用数据网最早出现于小型和微型计算机尚未发展的时期,主要是由一台主计算机利用电话线或专用通信线路连接许多数据终端,实现企业或行业内部的数据传输。在微型计算机已经普及的今天,专用数据网仍有着广泛的应用领域,如银行集中记账系统、火车、民航预定票系统等等。

Private data network (PDN) first appeared in the period when minicomputers and microcomputers have not yet developed. It is mainly composed of a host computer connecting many data terminals with telephone lines or special communication lines to realize data transmission within enterprises or industries. Today, with the popularity of microcomputers, private data network still has a wide range of applications, such as bank centralized accounting system, train, civil aviation booking system and so on.

组网原则

Networking Principles

为实现其建设目标,组建行业专用数据通信网络应遵循下述原则:

In order to achieve its construction goal, the following principles should be followed in the establishment of industry specific data communication network:

(1)需根据各行业的规模、组织结构、业务特点等基本情况以及行业需要设计网络,注意实用性与先进性的统一;

(1) we should design the network according to the scale, organizational structure, business characteristics and other industries, and pay attention to the unity of practicality and advanced nature.

(2)应进行数据流向、流量分析,所选择的方案应满足当前需求及中远期发展目标,并具有可扩展性与易管理功能;

(2) Data flow direction and flow analysis should be carried out, and the selected scheme should meet the current needs and medium and long-term development goals, and have scalability and easy management functions;

(3)具有满足行业特殊要求的安全可靠性;

(3) It has the safety and reliability to meet the special requirements of the industry;

(4)能兼容已有的专用网络,方便各专用系统接入或平滑过渡。

(4) It can be compatible with the existing private network and facilitate the access or smooth transition of various private systems.

专用数据网接入互联网

Private data network access to the Internet

接入互联网的原理

The principle of Internet access

一般来讲,专用数据网主要是以传输数据为主的网络。通过数据网

Generally speaking, the private data network is mainly a data transmission network. Through the data network

数据网接入互联网

Data network access to the Internet

数据网的安装、配置与测试

Installation, configuration and test of data network

(1)在 Windows 系统下点击“开始——控制面板——网络任务/创建一个新的连接”项;

(1) Click “start – control panel – network task / create a new connection” under Windows system;

(2)选择“用要求用户名和密码的宽带连接来连接”方式连接网络;

(2) Select “connect with broadband connection requiring user name and password” to connect to the network;

(3)设置需要输入的用户名和密码;

(3) Set the user name and password to be entered;

(4)登录数据网连接,实现接入互联网上网;

(4) Log in to the data network to connect and access to the Internet;

(5)如果不能上网,可以用 ping 命令测试,ping 指定地址,以查看网络是否逻辑连通。

(5) If you can’t access the Internet, you can use the ping command to test and Ping the specified address to check whether the network is logically connected.

连接方式

Connection mode

在专用数据网中,计算机与数据终端之间的连接方式如右图所示。

In the private data network, the connection between the computer and the data terminal is shown in the right figure.

专用数据网连接方式

Connection mode of private data network

1.点对点连接

1. Point to point connection

点对点方式连接最简单。计算机与终端之间由专用直达线路连接,且不需特殊的通信控制信号。但是,点对点方式所用的线路数目和接口多,因此只适合终端数目较少,终端分布区域小的场合。

Point to point connection is the simplest. The computer and the terminal are connected by a dedicated direct line without special communication control signal. However, the point-to-point mode uses a large number of lines and interfaces, so it is only suitable for the situation where the number of terminals is small and the distribution area of terminals is small.

2.轮询多点方式

2. Polling multipoint mode

在轮询多点方式中,多个终端由一条公共电路与计算机连接,从而在线路费用上是经济的。然而,在通信控制与管理方面,轮询多点方式需要专门的控制软件和统一的通信规程,从而增加了计算机程序设计的复杂性。

In the polling multipoint mode, multiple terminals are connected to the computer by a common circuit, so the cost of the circuit is economical. However, in the aspect of communication control and management, polling multipoint mode needs special control software and unified communication protocol, which increases the complexity of computer programming.

3.多路复用网

3. Multiplex network

多路复用网采用时分复用技术,因此在线路费用上也是较经济的。多路复用器之间的传输线路是高速的。一般的,高速线路的通信速率至少应等于各终端的通信速率之和。这种连接方式尤其适合于需要多路复用器而每个终端都需在计算机有独立接口的场合。

Multiplexing network adopts time division multiplexing technology, so it is more economical in line cost. The transmission line between multiplexers is high speed. Generally, the communication rate of high-speed line should be at least equal to the sum of the communication rates of each terminal. This kind of connection is especially suitable for the situation where the multiplexer is needed and each terminal needs to have an independent interface with the computer.

4.软件多路复用网

4. Software multiplex network

软件多路复用网是通过软件使计算机自动识别高速线路上的数据格式,并由此区分出数据来自于哪个终端。这种方式节省了硬件费用,但增加了软件编制、储存容量以及计算机时间上的费用。

The software multiplex network enables the computer to automatically identify the data format on the high-speed line through software, and thus distinguish which terminal the data comes from. This method saves the cost of hardware, but increases the cost of software programming, storage capacity and computer time.

5.集线器网

5. Hub network

利用集线器把来自许多终端的数据传输业务集中到少数线路上进行而不用多路复用器,就构成了集线器网。这种方法的通信业务处理能力介于轮询和多路复用方法之间。

A hub network is formed by using a hub to concentrate data transmission services from many terminals on a few lines without a multiplexer. The capability of this method is between polling and multiplexing.

6.软件控制集线器网

6. Software control hub network

为集线器增加数据缓冲存储功能,使其具有数据处理能力,就可进一步减小通信线路和计算机接口数目。具有数据存储处理能力的集线器通常使用小型通用计算机,通过控制程序完成数据处理功能。

The number of communication lines and computer interfaces can be further reduced by adding the function of data buffer storage to the hub to make it have the ability of data processing. The hub with the ability of data storage and processing usually uses a small general-purpose computer to complete the data processing function through the control program.


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