To conferee participating in large-scale trade fair, the challenge that they face is: Stage, Technology with fissile that must find several kinds and grow up, once IT department understands these technical superiority, can use and meet explosive users to increase the demand. These technical characteristics are: A good start participates in the course, in addition with the traditional heavyweight products (or with the Off-The-Shelf products at least) There is less involving. wireless mesh network (wireless mesh) exhibited during this Networld Interop exhibition of May of 2004 Accord with one of the above-mentioned condition.
In Wi-Fi Technology referred to at present, phrase television station It is that thewireless customer end is connected to be common somebody’s impression of. However, wireless mesh network (wireless mesh) Basic principle and that herewireless for concept at all have any similarity.
Realize traditional the intersection of telephone and satellite network of calling procedure to the telephone set ‘ And telephone user) To say it is diaphanous, similarly, wireless mesh network (wireless mesh) It is diaphanous too to Ethernet interface unit. Under many circumstances, the wireless mesh network expands the extant edge of network to the new geographical edge, in the wireless mesh network (wireless mesh) “one end” Can connect with the Off-The-Shelf wired infrastructure, and ” another end ” There is a Ethernet cable apparatus needing to visit those infrastructure.
To some degree, imagine that there is not a scene of physical Ethernet switchboard: Carry the oral cable and disconnect the connection from bottom panel of the switchboard in all connections RJ-45 behind the switchboard, the substitute is connect to the radio frequency receiver ‘ A port corresponds to the radio frequency receiver of one) . In that case, the port (and their wireless radio frequency receiver) of this network Can place on any position, and the radio frequency receiver network located in all radio frequency receivers will substitute the original switchboard. So long as every radio frequency receiver can relate to the miscellaneous at least one receiver, the port which connects receiver of the radio frequency forms the foundation of the Ethernet connection, thus can interconnect with apparatus of any Ethernet.
If is this kind of architecture, under the following two situations, wireless mesh network (wireless mesh) Realize the new method that Ethernet disposes.
A kind of situation is: Until what reason, wireless Technology use for expand wired the intersection of network and impossible physical location that up to originally to extant the intersection of Ethernet and edge. For example, have a COMMON traffic camera that can be visited along entering metropolitan every lamp pole in edge of expressway. In the intersection of mesh and network, each lamp pole have one the intersection of radio frequency and communicator and a Ethernet port, this port is connecting the camera based on Ethernet. Communicator of the radio frequency of the edge of the expressway will be exchanged each other, thus will form the foundation of key Ethernet, this end of key Ethernet is connected to the backward stroke station (backhaul) ,Pass this backward stroke station (backhaul) Reach the image transmission of the traffic the server of the picture and reach Internet finally.wireless mesh network (wireless mesh) Technology has dispelled and excavated the necessity of the trench at the edge of the expressway.
Under second situation, particular problem until with wired to dispose very under the realistic situation, demand to dispose one independent Ethernet fast. This kind of situation seems to widen needing to erect one Ethernet in one in the middle of the location, and does not have ready-made usable network link or need to be used in particular application in fact. For example or may all present this kind of situation in the battle field while handling the emergency.
Just as the term ” Network (mesh) ” Meaning,radio frequency is receiver not merely chrysanthemum link that chain together to last network (certainly want you by one that can realize being too like this) . So long as keep they each other distances certain and in can range of intercommunication in, they can form a wireless mesh network (wireless mesh) . If the the network one ” One end ” The traffic jam appears, this kind of distribution contributes to solving the congested problem that may meet. While the congested problem appears, wireless mesh network (wireless mesh) Can route that searching around may be chosen of intelligence dispel congestedly.
That different network offer the intersection of route and intelligence and other properties of network ‘ Such as encrypting and automatic configuration) Not only different each other, but also this is a foundation which forms their privately owned products. In other words, because of the mesh network (mesh) Technology lacks the standard, a mesh hardware products which providers offered will be unable to coordinate the work with the products that another provider offered. Now, though the enterprises of some heavyweight, such as Intel has been represented to thewireless mesh network (wireless mesh) Interest of network, but associated the intersection of hardware and most product come from some unknown producers such as PacketHop, Tropos Networks, MeshNetworks, BelAir Networks, Strix Systems, and Firetide,etc..
Mesh network (wireless mesh) The manufacturer Firetide Company has attended Networld Interop exhibition of this year, has shown their indoor and outdoor mesh hardware products, it is HotPoint 1000S and HotPoint 1000R that everybody knows very well of now. The technological director Ike Nassi of Firetide shows, there is a customer now in the company, these customers just consider the wired disposition at first, total price is probably more than 100,000 dollars, this needs realizing by several weeks. Nassi shows, in the near future, will use HotPoints to reduce by about 70% of the network configuration expenses.
HotPoints of Firetide Company is the self-configuring. What they used is ad-hoc network mode based on 802.11b Wi-Fi, can stop having HotPoint which cheats ability to enter the network by using SSID and to encrypt the key word. However, to dispose as to the great majority, Nassi represents, ” our customer only only opens him, then put it aside. Do not need them to do any other work. ” Speak of and encrypt the question, all data packets communicating in the network will be encrypted, thus prevent other people from taking a sniff at and visiting these data packets from the sky. But the cipher procedure is diaphanous to Ethernet apparatus. Once the content of the communication reaches the wired part, it turns into a cleartext – -Outdated Ethernet. If it is an important problem to be safe, propose using VPN strongly.
Firetide claims, the power can reach two miles for the coverage of 200 milliwatts, outdoor 1000R valued 2000 dollars. Only ones that should make this focus can work normally are required the electricity, and this electric source can be of any kind, it even can be a solar battery. Come theoretically and say, people can construct a significant mesh network (wireless mesh) In order to cover the huge geographical space.
It is considered that from unfavorable view, if this technical foundation is 802.11b, the challenge existing for it may be its characteristic problem. It is not merely a characteristic of the network, also include connecting the characteristics of all 802.11b access points of it, so the wireless customer end can be utilized ” Expand the boundry ” . To 802.11b, it realizes and operates by three signal channels, if you want to realize only so much frequency spectrum can be used in wirelesscommunication. From the viewpoint of technology, because its frequency spectrum will have a negative impact on characteristic, so mesh network (wireless mesh) It will be unable to come to compete with WLAN.
And, except that it is unable to compete with WLAN within the range of radio wave, Firetide make genuine basic reference any, come, prove in when it will be network what place exhaust yet. For example what kind of what kind of the intersection of communication and flowrate can application produce? What is the number of the optimum focus? According to the meaning of Nassi, the company is solving these problems now, in order to help its customer to realize the accurate disposition.
Proceed from future angle, as to the mesh network (wireless mesh) The hardware comes says, the preferably apparatus should be a wireless radio frequency receiver. When the network can really be used, nobody will forbid the network hardware supplier to use 802.11 miscellaneous technology, even WiMax. Come to tell theoretically, the network can be based on WiMax technically, and the access point which connect the mesh may be 802.11a, b or g, will not so have airborne competition.
By the look of long-term, if mesh network (wirele ss mesh) Can get promoted, I hope in the bull networking products manufacturing enterprise, for instance Cisco and 3Com,etc. become master providers.
Since 2009, ADVANTICSYS is a high-tech SME which has an important background in information and communication technologies like specializing in the field of wireless sensor networks (WSN), Wireless Mesh Network Products and other remote monitoring systems. ADVANTICSYS does not only sale products but also offers customized solutions based on remote monitoring system technologies such as IEEE802.15.4.
ReplyDeleteWireless Sensor Networks (WSN) | Wireless Mesh Network Products