What are the characteristics of UTP cable?
Twisted pair cabling comes in two varieties: shielded and unshielded. Unshielded twisted pair (UTP) is the most popular and is generally the best option for school networks The quality of UTP may vary from telephone-grade wire to extremely high-speed cable. The cable has four pairs of wires inside the jacket. Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices. The tighter the twisting, the higher the supported transmission rate and the greater the cost per foot. The EIA/TIA (Electronic Industry Association/Telecommunication Industry Association) has established standards of UTP and rated five categories of wire. Categories of Unshielded Twisted Pair Type Use Category 1 Voice Only (Telephone Wire) Category 2 Data to 4 Mbps (LocalTalk) Category 3 Data to 10 Mbps (Ethernet) Category 4 Data to 20 Mbps (16 Mbps Token Ring) Category 5 Data to 100 Mbps (Fast Ethernet) Buy the best cable you can afford; most schools purchase Category 3 or Category 5. If you are designing a 10 Mbps Ethernet network and are considering the cost savings of buying Category 3 wire instead of Category 5, remember that the Category 5 cable will provide more "room to grow" as transmission technologies increase. Both Category 3 and Category 5 UTP have a maximum segment length of 100 meters. In Florida, Category 5 cable is required for retrofit grants. 10BaseT refers to the specifications for unshielded twisted pair cable (Category 3, 4, or 5) carrying Ethernet signals. Category 6 is relatively new and is used for gigabit connections.
What are the characteristics that define an industry?
Industries are usually grouped together based on the similarity of their products or processes.Three sector theory dictates that there are three main industry groupings. Which usually indicate the stage of a country’s development.Primary - raw material extractionSecondary - manufacture and sale to consumersTertiary - servicesThe more economically advanced a country is the more of their GDP is generated through services and vice-versa.sub-industries within these groups are usually defined by product and market.E.g:food industry, automotive industry, entertainment industry…
What is a cost accounting?
its a very long, arduous class that really is very little fun. skip class today. **edit** see the rest of the comments? i told you...
Five major characteristics of cancer cells?
cancer cells experience uncontrolled and disorganized growth a cancer cell divides to form a growth, or tumor, that invades and destroys neighboring healthy tissue Cancer cells also tend to be motile The shape and organization of the nuclei of cancer cells may be markedly different from that of the nuclei of normal cells of the same origin... Cancer cells often secrete enzymes that enable them to invade neighboring tissues sHaKiRa
What are the features of operating system?
According to me:These are the components reflect the services made available by the O.S.Process ManagementProcess is a program in execution --- numerous processes to choose from in a multiprogrammed system,Process creation/deletion (bookkeeping)Process suspension/resumption (scheduling, system vs. user)Process synchronizationProcess communicationDeadlock handlingMemory ManagementMaintain bookkeeping informationMap processes to memory locationsAllocate/deallocate memory space as requested/requiredI/O Device ManagementDisk management functions such as free space management, storage allocation, fragmentation removal, head schedulingConsistent, convenient software to I/O device interface through buffering/caching, custom drivers for each device.File SystemBuilt on top of disk managementFile creation/deletion.Support for hierarchical file systemsUpdate/retrieval operations: read, write, append, seekMapping of files to secondary storageProtectionControlling access to the systemResources --- CPU cycles, memory, files, devicesUsers --- authentication, communicationMechanisms, not policiesNetwork ManagementOften built on top of file systemTCP/IP, IPX, IPngConnection/Routing strategies``Circuit'' management --- circuit, message, packet switchingCommunication mechanismData/Process migrationNetwork Services (Distributed Computing)Built on top of networkingEmail, messaging (GroupWise)FTPgopher, wwwDistributed file systems --- NFS, AFS, LAN ManagerName service --- DNS, YP, NISReplication --- gossip, ISISSecurity --- kerberosUser InterfaceCharacter-Oriented shell --- sh, csh, GUI --- X, Windows 95