CN1445964A

CN1445964A - Wireless network access switching port

Info

Publication number: CN1445964A
Application number: CN 03105046
Authority: CN
Inventors: 付绪昌; 江宇星
Original assignee: Sanming Business Electronics Equipment Co Ltd Beijing
Current assignee: Sanming Business Electronics Equipment Co Ltd Beijing
Priority date: 2003-03-03
Filing date: 2003-03-03
Publication date: 2003-10-01
Anticipated expiration: 2023-03-03
Also published as: CN1214575C

Abstract

An access switching-in port which includes Ethernet transmission channel interface circuit, conversion circuit and radio frequency module circuit works according to the following steps: A. for the signal being sent out by PC, 1) converting entity layer signal to TEEE 802.3 standard MII signal by Ethernet interface circuit, 2) converting IEEE 802.3 information packet to IEEE 802.116 standard, in the bridged chip, 3) modulating the digit signal to the base frequency signal in the baseband, and 4) converting the baseband signal to the high-frequency signal in the radio frequency module; B. for signal being received by AP, 1) converting RF signal to the base frequency signal, 2) modulating the base frequency signal to the digit signal, 3) converting IEEE 802.116 information packet to be IEEE 802.3 standard and 4) converting the signal to the entity layer signal.

Description

Access switching-in port

Technical field

The invention belongs to wireless communication field, specially refer to access switching-in port.

Background technology

Wired local area network is by hub (switch, the meaning is the jack conversion) and the network interface card composition, cable network has been subjected to more restriction in communication, the distance of two websites is when using copper cable, be limited in 500 meters, even adopt monomode fiber also can only reach 3 kilometers, and in the WLAN (wireless local area network), the distance between two websites can reach 50 kilometers at present, owing to there is not the restriction of cable, the user can indiscriminately ad. as one wishes increase work station or reconfigure work station, communication range is subjected to the environmental condition restriction little, has widened the transmission range of network, and wireless network networking flexibility height, increase WAP (wireless access point), just can increase number of users and coverage, and allow in a big way, to roam, simultaneously, for wired network, the wireless network cost is low, antijamming capability is strong; Throughput is big, can realize the message transmission rate of 11Mbps; The reliability height can be realized message transmission in narrower frequency bandwidth; Its code division multiple access ability is strong, " access switching-in port " that the inventor researched and developed, be called for short AccessPoint Clinet, AP clinet, client and wireless network card that this pattern is equivalent to Access Point pattern are in equivalent effect, different is that this Clinet connects finite element network or single device only, communicate by letter with other wireless network card or finite element network by ap, the operation principle of AP clinet is to adopt the mode of operation identical with wireless network card, before the transmission data, whether intercept channel idle, the idle request that then sends rts requirement transfer of data to AP is arranged, AP agrees that the back sends cts, stops other user capture, and the request user begins transfer of data.In this way, any one work station in the WLAN (wireless local area network) can be successfully with the center local area network (LAN) in any one work station communicate, do not need driver just can connect the equipment of any computer or support Etbernet port, computer or equipment are coupled together by AP and network, realize network service, as a client, AP clinet must be arranged to identical ESSID with main AP, identical wireless channel.And in " Preferred BSS ID " MAC Address number of the main AP of input, many AP clinet just can communicate by letter with an AP as network interface card like this, to set up network, AP clinet radio network technique adopts 802.11b, because what use is the open frequency range (between the 2.4G-2.48G) of State Radio Regulatory Commission's permission, thereby be widely used in civilian every field, and as: industry, retail business, warehouse, harbour, medical treatment or the like.

Summary of the invention

The technical issues that need to address of the present invention, be that the microcomputer in the wireless network is communicated by wireless mode, real-time information service all is provided anywhere, break away from the cable network cable constraint and weak point such as restricted strengthens mobility, not only support the communication between the mobile host, also allow wireless device to have access to spider lines, make communication range reduced by the environmental condition restriction, widen the transmission range of network.To achieve these goals, researched and developed AP clinet radio network technique (802.11b), they are realized by the following technical solutions, a kind of access switching-in port, comprise Ethernet preach interface circuit, change-over circuit and radio frequency module circuit, it is characterized in that, according to following steps work: A, for the signal that outwards sends from PC, be respectively the physical layer signal (MLT-3) that 1. in ethernet interface circuit, ethernet line is transmitted and be transformed into TEEE802.3 standard MII signal; 2. in bridging chip, the Datagram of IEEE802.3 is converted to the standard of IEEE802.11b; 3. in base band, be the signal (I/O) of fundamental frequency with the numerical digit modulating signal; 4. in radio-frequency module, fundamental frequency signal is converted to high-frequency signal, and will sends after the signal amplification; B, for the signal that receives by AP, be respectively and 1. receive the RF signal, high-frequency signal is converted to fundamental frequency signal, 2. fundamental frequency signal (I/O) is modulated to the signal of numerical digit; 3. the Datagram of IEEE802.11b is converted to the standard of IEEE802.3; 4. with the MII signal transition physical layer signal (MLT.3); Thereby whole conversions of digital-to-analogue/modulus have been finished.In bridging chip, comprise two parts of internal memory and flash memory; The working method of described access switching-in port, it is the wireless stream of data that the TCP/IP data flow is converted to WLAN, this practice can make full use of existing resource, can under the precondition that does not change any software and hardware structure, realize wireless network, fully guaranteed the original investment of enterprise, be unlikely to carry out a large amount of equipment and eliminate.The working method of AP clinet can not need driver fully in the data flow conversion that protocol layer carries out TCP/IP and WLAN, as long as system can support the TCP/IP data flow, just can the corresponding WLAN data flow that is converted into, and realize comprehensive covering of wireless network.Utilize 128 WEP to encrypt, can guarantee the fail safe of sensitive data, the invention has the beneficial effects as follows, under the secure scheme of multi-enciphering, can realize that wireless network is more safe and reliable than cable network, make and have only the wireless terminal of mandate just can land and accesses network, illegal terminal can't land, and has guaranteed the validated user safety of data.

Description of drawings

The circuit design block diagram that Fig. 1 accesses terminal for the present invention

The job step schematic diagram that Fig. 2 accesses terminal for the present invention.

Embodiment

With reference to Fig. 1,2 indication circuits design block diagram, wherein ethernet interface circuit 1, network transmission physical layer signal (MLT-3) is transformed into IEEE802.3 standard MII signal thus, coupled is bridging chip 2, this chip is responsible for the rule process that digital signal place (CPU) finishes the agreement of 802.11b, 2.1 be Installed System Memory SRAM, 2.2 be the flash memory of system, the configuration information of storage system and program code, behind the system cut-off, data can not lost, and what link to each other with chip 2 is base band 3, it becomes low frequency signal with the high-frequency microwave data transaction, convert digital signal again to, the part of Xiang Lianing is a radio-frequency module 4 at last, after it is transformed into high-frequency signal with fundamental frequency signal, again signal is amplified and launch, or signal that will receive gives base band 3 again after amplifying and handles, and the signal that A represents outwards to send from PC among Fig. 2 is through each step of 1-4, and B represents the signal that received by AP, via 4-1 each several part circuit, change physical layer signal (MLT-3) at last into and finish digital-to-analogue conversion respectively.

Claims

1, a kind of access switching-in port, comprise Ethernet preach interface circuit, change-over circuit and radio frequency module circuit, it is characterized in that, according to following steps work: A, for the signal that outwards sends from PC, be respectively the physical layer signal (MLT-3) that 1. in ethernet interface circuit, ethernet line is transmitted and be transformed into TEEE802.3 standard MII signal; 2. in bridging chip, the Datagram of IEEE802.3 is converted to the standard of IEEE802.11b; 3. in base band, be the signal (I/O) of fundamental frequency with the numerical digit modulating signal; 4. in radio-frequency module, fundamental frequency signal is converted to high-frequency signal, and will sends after the signal amplification; B, for the signal that receives by AP, be respectively and 1. receive the RF signal, high-frequency signal is converted to fundamental frequency signal, 2. fundamental frequency signal (I/O) is modulated to the signal of numerical digit; 3. the Datagram of IEEE802.11b is converted to the standard of IEEE802.3; 4. with the MII signal transition physical layer signal (MLT.3); Thereby whole conversions of digital-to-analogue/modulus have been finished;

2, access switching-in port according to claim 1 is characterized in that, in bridging chip, comprises two parts of internal memory and flash memory;

3, access switching-in port according to claim 1 is characterized in that, the working method of described access switching-in port is the wireless stream of data that the TCP/IP data flow is converted to WLAN.