© 2007 Cisco Systems, Inc. All rights reserved. 1 Valašské Meziříčí 9.6.2014 Networking Media.

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Presentation transcript:

© 2007 Cisco Systems, Inc. All rights reserved. 1 Valašské Meziříčí Networking Media

Valašské Meziříčí Objectives Types of cables and connectors Constructing and terminating twisted pair cables Determining type of cable needed

Valašské Meziříčí Cables and Connectors

Valašské Meziříčí Cables and Connectors Types of cables Today Yesterday Tomorrow

Valašské Meziříčí Twisted pair cables Cables and Connectors 4 pairs of copper wires twisted together UTP = Unshielded Twisted Pair There is no shielding

Valašské Meziříčí Twisted pair cables Cables and Connectors

Valašské Meziříčí Coaxial cable Cables and Connectors Center conductor Shielding Used in TV and radio applications Not used in computer networks any more

Valašské Meziříčí Optical fiber cables Cables and Connectors

Valašské Meziříčí Optical fiber cables Cables and Connectors

Valašské Meziříčí Optical fiber cables Cables and Connectors Components of the puls start at the same time. Here they arrive at the same time => good result. Here they arrive at different times => bad result.

Valašské Meziříčí Optical fiber cables Cables and Connectors

Valašské Meziříčí Optical fiber cables Cables and Connectors

Valašské Meziříčí Construct and Terminate Twisted Pair Cables Cross-over and straight through cables Transmit pins on one device must be connected to receive pins on the other device. Transmit pins Receive pins Device 1 Transmit pins Receive pins Device 2 There must be a crossing in the path.

Valašské Meziříčí Construct and Terminate Twisted Pair Cables Cross-over and straight through cables Transmit pins Receive pins PC Transmit pins Receive pins Switch No need of a crossing in the path. A crossing is inside each switch.

Valašské Meziříčí Construct and Terminate Twisted Pair Cables Cross-over and straight through cables A crossing is inside each switch. Transmit pins Receive pins Switch Another crossing must be in the path. Transmit pins Receive pins Switch

Valašské Meziříčí Construct and Terminate Twisted Pair Cables Cross-over and straight through cables Conclusion: There must be odd number of crossings in the whole path. PC Switch Like devices: Crossover cable Unlike devices: Straight-through cable

Valašské Meziříčí Construct and Terminate Twisted Pair Cables How to terminate UTP cables The plug is plugged into the jack.

Valašské Meziříčí Construct and Terminate Twisted Pair Cables How to terminate UTP cables Two standards on plugs and jacks

Valašské Meziříčí Construct and Terminate Twisted Pair Cables How to terminate UTP cables Crossover cable: A – B Straight-through cable: B – B (in Europe) Remember: A for America Straight-through cable: A – A (in America)

Valašské Meziříčí Construct and Terminate Twisted Pair Cables How to terminate UTP cables Hold the plug as if you wanted to insert it into the jack, and arrange the color pairs to correct color sequence. Jack

Valašské Meziříčí Construct and Terminate Twisted Pair Cables How to terminate UTP cables

Valašské Meziříčí Construct and Terminate Twisted Pair Cables Cable testing

Valašské Meziříčí Summary Physical cabling media must conform to standards Cabling best practices reduce attenuation and crosstalk

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