Reference to the safety problem occurred in the computer network, the network safety technology taking firewall, password technology, authendcation and information transmitting server,double disk network switch, network switch as main measures, in both of physical and non-physical isolation are discussed.

On application of physical isolation in electrical dispatching network;

Design and realization of security physical isolation system;

Study and Development of Bootstrap Program for PCI-based Physical Isolation Card;

Method of Physical Separation for Hard Disk Driver;

The physical separate technology, strongly identify authentication technology and security audit technology were applied to the system in order to implement the physical separation between internal network and exte.

According to the characteristics of Security Network Terminal(SNT),this text puts forward a precept based on the SNT,which not only allows users switching freely but also guarantees the physical separation of network.

Layered dispatch communication network with air gap;

A scheme applying air gap system to protect dispatching communication network is proposed.

A realization of physical insulation for electric power system;

The physical insulation device was based on 8051 chip,and can be used by different aspect according to the different needs,and has such characters,extension,systems and flexible and diversified forms,The physical insulation is an important information security technology,its practic.

Study on Application of Gap Technology for Information Security in Networked Manufacturing;

A lot of special net and involved secret net must keep working well with outside by gap technology in electric government affairs.

This card adopts the transparent to user Gap Technology and the network connection control technology , which can effectively protect the harddisk data of the computer connected t.