SoftInform Company announced a new release of its search system SearchInform 1.1.02.Written by Max Maglias
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In addition to rubricator, new version of SearchInform features automatic documents categorization system that automatically sorts new documents into existing rubrics according to overall similarity principle. The proposed approach to organizing and consolidating data allows structuring informational components of any large enterprise within framework of one application. With all this you won't have to convert your documents and data into a single format. All information available for indexing and further search will be sorted, structured and displayed in a most convenient way. SeachInform provides prompt document search and structures data in corporate network. It gives you power over information. It gives you ability to act while other are still searching.More details about SearchInform. Version 1.1.02 on official site: http://www.searchinform.com/site/ru/index.htm If you have any questions, please write to max@offliner.com
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| | physical topology of a network refers to the configuration of cables, computersWritten by Gianfranco Fracassi
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The protocols used with star configurations are usually Ethernet or LocalTalk. Token Ring uses a similar topology, called star-wired ring. Star-Wired Ring A star-wired ring topology may appear (externally) to be same as a star topology. Internally, MAU (multistation access unit) of a star-wired ring contains wiring that allows information to pass from one device to another in a circle or ring (See fig. 3). The Token Ring protocol uses a star-wired ring topology. Tree A tree topology combines characteristics of linear bus and star topologies. It consists of groups of star-configured workstations connected to a linear bus backbone cable (See fig. 4). Tree topologies allow for expansion of an existing network, and enable schools to configure a network to meet their needs. Advantages of a Tree Topology •Point-to-point wiring for individual segments. •Supported by several hardware and software venders. Disadvantages of a Tree Topology •Overall length of each segment is limited by type of cabling used. •If backbone line breaks, entire segment goes down. •More difficult to configure and wire than other topologies. 5-4-3 Rule A consideration in setting up a tree topology using Ethernet protocol is 5-4-3 rule. One aspect of Ethernet protocol requires that a signal sent out on network cable reach every part of network within a specified length of time. Each concentrator or repeater that a signal goes through adds a small amount of time. This leads to rule that between any two nodes on network there can only be a maximum of 5 segments, connected through 4 repeaters/concentrators. In addition, only 3 of segments may be populated (trunk) segments if they are made of coaxial cable. A populated segment is one which has one or more nodes attached to it . In Figure 4, 5-4-3 rule is adhered to. The furthest two nodes on network have 4 segments and 3 repeaters/concentrators between them. This rule does not apply to other network protocols or Ethernet networks where all fiber optic cabling or a combination of a fiber backbone with UTP cabling is used. If there is a combination of fiber optic backbone and UTP cabling, rule is simply translated to 7-6-5 rule. Considerations When Choosing a Topology: •Money. A linear bus network may be least expensive way to install a network; you do not have to purchase concentrators. •Length of cable needed. The linear bus network uses shorter lengths of cable. •Future growth. With a star topology, expanding a network is easily done by adding another concentrator. •Cable type. The most common cable in schools is unshielded twisted pair, which is most often used with star topologi
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