The more twists per foot in a pair of wires the more resistant the pair will be

The more twists per foot in a pair of wires the more

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The more twists per foot in a pair of wires, the more resistant the pair will be to cross-talk or noise, higher-quality, more expensive twisted-pair cable contains more twists per foot Its relatively inexpensive, flexible and easy to install and it can span a significant distance before requiring a repeater (a device that retransmits a digital signal in its original form) Shielded Twisted Pair (STP): cable consists of twisted-pair wires that are not only individually installed but also surrounded by a shielding made of a metallic substance (ex. Foil), the shielding acts as a barrier to external electromagnetic forces, thus preventing them from affecting the signals traveling over the wire inside the shielding Unshielded Twisted Pair (UTP): consists of one or mote insulated wire pairs encased in a plastic sheath, it doesn’t contain any additional shielding for the twisted pairs, UTP is both less expensive and less resistant to noise than STP Rollover Cable: whereas a crossover cable reverses the transmit and receive wire pairs, a rollover cable reverses all the wires without regard to how they are paired o Also called Yost cables or Cisco console cables, they can be used o Routers have two different ports: Ethernet port: allow for network communications and are the type of port used to create LANs through the router Console port: used to communicate with the router itself, such as when making programming changes to the device Copper Connectors and Couplers o Connector: connects a cable to a network device, they are specific to a particular media type, but you can integrate two media types by using media converters Media converter: hardware the enables networks or segments running on different media to interconnect and exchange signals o Coupler: passes data through a homogeneous connection without any modification Ex. UTP connector: can connect 2 UTP cables PoE (Power over Ethernet): IEEE released its 802.3af standard which specifies a method for supplying electrical power over twisted-pair Ethernet connections o The PoE standard specifies 2 types of devices: PSE (Power sourcing equipment): refers to the device that provides the power, usually this device depends on backup power sources
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PDs (powered devices): those that receive the power from the PSE Fiber-Optic Cable Contains one or several glass or plastic fibers at its center (core), data is transmitted through the central fibers via pulsing light sent from a laser, or an LED,
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  • Fall '12
  • FaridShiraz
  • Twisted pair, Coaxial cable, Crossover Cable, Wavelength Division Multiplexing

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