CN2772133Y

CN2772133Y - Intranet-internet control device

Info

Publication number: CN2772133Y
Application number: CN 200520089411
Authority: CN
Inventors: 武传胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-22
Filing date: 2005-02-22
Publication date: 2006-04-12
Anticipated expiration: 2015-02-22

Abstract

The utility model relates to an intranet-internet control device. A bistable circuit is composed of four NOR gate circuits, the overturn of the bistable circuit is controlled by two switches, and the output end of the bistable circuit is connected with a grid electrode of an audion. A source electrode of the audion is connected with the input end of a relay of which the other end is connected with power supply, the contacts of the relay respectively supply electricity for two hard disks and two network cards in a computer, and a drain electrode of the audion is connected with the ground. The two hard disks arranged in the same computer are controlled by the utility model to switch and are respectively used for the operation of a local area network and a wide area network so as to make the hard disks independently operated, and documents in each hard disk only can be opened to the self network and can not be browsed by other network passengers. The utility model ensures the safety of a computer network, and solves the problem that the same computer can get on the local area network and can also get on the wide area network.

Description

The intranet and extranet control device

Technical field the utility model relates to the hard disc of computer control device, and definite saying so discloses a kind of intranet and extranet control device, belongs to technical field of the computer network.

An installation-piece hard disk in the computer of background technology routine, be used for operate as normal, when it is used for working under Local Area Network and wide area network (WAN) (as the Internet net) situation simultaneously, because the document of this hard-disc storage under the local area network (LAN) state, under the state of wide area network, be easy to illegally be stolen and revise by " hacker " or other " back door " program, this computer master's interests are encroached on, therefore a lot of computers dare not enter wide area network, this has just influenced the normal use of numerous clients to wide area network, has wasted big a large amount of precious resources on the wide area network.China pays much attention to the computer information safe problem in addition, regulation in the 6th of " Regulations of Internet Security of Computer Information System " chapter 2 of National Administration for the Protection of State Secrets promulgation: the computer information system that relates to state secret, must not link with Internet or other public information network directly or indirectly, must carry out physical isolation.

Summary of the invention the utility model provides a kind of intranet and extranet control device, and task is to solve active computer under wide area network status, the problem that the document of local area network (LAN) is easily illegally stolen, revised in the hard disk.

Task of the present utility model is achieved in that by four NOR gate (M1, M2, M3, M4) forms a bistable circuit, its upset is controlled by two switches (AN1, AN2), the grid of the output termination triode T of bistable circuit, the source electrode of triode T is succeeded the input of electrical equipment J, another termination power of relay J, four contacts of relay J are respectively two hard disks in the computer, two network interface card power supplies, the grounded drain of triode T.

The utility model will be installed two hard disk A and B in the computer when using, isolation controller is by Vs power supply in the computer ATX electric power, and when the computer energized, initial condition is the local area network (LAN) state, and 2 ends of NOR gate M3 and 1 end of M4 are low level.When the user selects Local Area Network work, Push switch AN1,1 end of NOR gate M3 becomes low level, 2 ends also are low level, thereby M3 output high level, make the output of M1 become low level, the then bistable circuit upset of M1, M2 composition, M2 exports high level, M1 output low level, indicator light LED1 lights, circuit enters the local area network (LAN) state, and hard disk A is activated, the work of A network interface card, hard disk B is closed, and the B network interface card is not worked.At this moment, the document among the hard disk A can not gone up the Internet wide area network and is called or stolen; When the user selects wide area network work, press AN2, then 2 ends of M4 become low level, 1 end is a low level, and M4 output high level makes the output of M2 become low level, the bistable circuit upset, the M1 output low level, M2 exports high level, and indicator light LED2 lights, and circuit enters wide area network (WAN), triode T conducting, the relay J adhesive, power supply is to hard disk B power supply, and relay J is controlled the B network interface card work that makes respectively simultaneously, and the A network interface card is under an embargo, because power supply to hard disk A power supply, so hard disk A is under an embargo, has not been realized the isolation handoff functionality of isolation controller.

Good effect of the present utility model is: two hard disks are installed on same computer, switch by the utility model control, be respectively applied for the work of local area network (LAN) and wide area network, make its separate work, document in the hard disk is only open to Home Network separately, can do not browsed, guarantee the fail safe of computer internet, solve same computer and can go up the problem that local area network (LAN) can be gone up wide area network again by other netter.

Description of drawings Fig. 1 is the utility model circuit theory diagrams.

Embodiment further specifies the utility model below in conjunction with accompanying drawing:

In Fig. 1, four NOR gate M1, M2, M3, M4 form the bistable state reverse circuit, model is selected 74HC08 for use, LED 1, LED2 are serially connected in respectively between the output and power supply Vs of M1, M2, the grid of the output termination field effect transistor T of bistable circuit, the source electrode of field effect transistor T is succeeded the input of electrical equipment J, another termination power of relay J, four contact J1, J2, J3, J4 of relay J are respectively hard disk A, B in the computer and network interface card (NIC) A, B feeder ear, the grounded drain of field effect transistor T.Field effect transistor T selects IRF65980 model metal-oxide-semiconductor for use.

Claims

1, a kind of intranet and extranet control device, it is characterized in that: a bistable circuit, its upset is by two switch controls, the grid of the output termination triode of bistable circuit, the source electrode of triode is succeeded the input of electrical equipment, another termination power of relay, four contacts of relay are respectively two hard disks in the computer, two network interface card power supplies, the grounded drain of triode.

2, intranet and extranet control device according to claim 1 is characterized in that: four NOR gate (M1, M2, M3, M4) constitute bistable circuit.

3, intranet and extranet control device according to claim 1 is characterized in that: LED 1, LED2 are serially connected in respectively between the output and power supply Vs of M1, M2.