A router is a computer whose software and hardware are usually tailored to the tasks of routing and forwarding, generally containing a specialized operating system (e.g. Cisco's IOS or Juniper Networks JUNOS and JUNOSe or Extreme Networks XOS), RAM, NVRAM, flash memory, and one or more processors.High-end routers contain many processors and specialized Application-specific integrated circuits (ASIC) and do a great deal of parallel processing. Chassis based systems like the Nortel MERS-8600 or ERS-8600 routing switch, (pictured right) have multiple...
Thursday, February 28, 2008
Saturday, February 23, 2008
Types of cable
Cables can be sorted into several categories and types. Generally it can by sorted into two main groups, structural and informatic.Application * Wire rope (wire cable) * Audiovisual cable * Bicycle cable * Communications cable * Computer cable * Mechanical cable * Submersible cableCable typeBasic cable types are as follows: Basic * Coaxial cable * Multicore cable (consist of more than one wire and is covered by cable jacket) * Optical fiber cable * Ribbon cable * Single cable (from time to time this name is used...
Cable
A cable is one or more wires or optical fibers bound together, typically in a common protective jacket or sheath. The individual wires or fibers inside the jacket may be covered or insulated. Combination cables may contain both electrical wires and optical fibers. Electrical wire is usually copper because of its excellent conductivity, but aluminum is sometimes used because it costs less.ConstructionElectrical cables may be made flexible by stranding the wires. In this process, smaller individual wires are twisted or braided together to produce...
Tuesday, February 5, 2008
Quality of service
n the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service, abbreviated QoS, refers to resource reservation control mechanisms rather than the achieved service quality. Quality of Service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow. Quality of Service guarantees are important if the network capacity is limited, for example in cellular data communication, especially for real-time streaming...
Type Of Network
Personal Area Network (PAN)A personal area network (PAN) is a computer network used for communication among computer devices close to one person. Some examples of devices that may be used in a PAN are printers, fax machines, telephones, PDAs or scanners. The reach of a PAN is typically within about 20-30 feet (approximately 4-6 Meters). PANs can be used for communication among the individual devices (intrapersonal communication), or for connecting...
Computer Network 2
Network ArchitecturesComputer networks may be classified according to the functional relationships which exist between the elements of the network, e.g., Active Networking, Client-server and Peer-to-peer (workgroup) architectures.By network topologyMain article: Network TopologyComputer networks may be classified according to the network topology upon which the network is based, such as Bus network, Star network, Ring network, Mesh network, Star-bus...
Computer Network
A computer network is an interconnection of a group of computers. Networks may be classified by what is called the network layer at which they operate according to basic reference models considered as standards in the industry such as the four-layer Internet Protocol Suite model. While the seven-layer Open Systems Interconnection (OSI) reference model is better known in academia, the majority of networks use the Internet Protocol Suite (IP) as their...