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36 Cards in this Set
- Front
- Back
Two broad categories of cables |
Copper Wire, Fibre Optic |
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Main difference between the two types of cables |
Composition of signals, Speed of signals, Distance the signal can travel |
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•number of bits per second thatcan be transmitted across a medium |
BandwidthRating |
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•maximum length of cable betweentwo network devicesD |
MaximumSegment Length |
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Eachcable type can transport data only so far before its signals begin to weakenbeyond what can be read by a receiving device |
attenuation |
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Afactor determining bandwidth is how bit signals are represented on the medium |
encoding |
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Interferenceto electrical signals on copper media comes in the form of |
–electromagneticinterference (EMI) andradiofrequency interference (RFI) |
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–is interference one wiregenerates on another wire when both wires are in a bundle |
crosstalk |
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Criteria for Choosing Network Media |
Cable Grade, Connection Hardware, Ease of Installation, Testability, Total Cost |
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Twisted pair cables come in two types: |
Shielded and unshielded |
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•are necessary to improveresistance to crosstalk between the individual wires and EMI from outsidesources |
Twists |
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•Consists of one or more pairs ofinsulated strands of copper wires twisted around one another and housed in anouter jacket |
Twisted Pair Cable |
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Most Networks use |
Unshielded Twisted Pair cable |
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Twisted Pair Cable Plant Components |
RJ-45 Connectors, Patch Cable, RJ-45 Jacks, Patch Panels, Distribution Racks |
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–Most commonly used in patchcables, which are used to connect computers to hubs, switches, and RJ-45 walljacks |
RJ-45 Connectors, |
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•short cable for connecting acomputer to an RJ-45 wall jack or connecting a patch-panel port to a switch or hub |
Patchcable |
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•what you plug an RJ-45 connectorinto when the computer is not near a switch or hub |
RJ-45jacks |
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usedto terminate long runs of cable from where the computers are to the wiringcloset |
PatchPanels [ |
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•hold network equipment such asrouters and switches, plus patch panels and rack-mounted servers |
Distributionracks |
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•specifies how cabling should beorganized, regardless of the media type or network architecture |
Structuredcabling |
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•whereworkstations and other user devices are located |
Work Area |
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runs from the work area’s wall jack to the telecommunication closet and is usually terminated at a patch panel |
Horizontalwiring |
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•house servers, routers, switches,and other major network equipment and serves as a connection point for backbonecabling |
EquipmentRooms |
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–Runs between floors or wings of abuilding and between buildings; interconnects TCs and equipment rooms |
BackboneCabling |
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•the location of the cabling andequipment that connects a corporate network to a third-party telecommunicationsprovider |
EntranceFacility |
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•putting RJ-45 plugs on the endsof cable or punching down wires into terminal blocks on a jack or patch panel |
Cabletermination |
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Two standards of arrangement of wires: |
–568A and 568B |
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Standard patch cables are called |
straight-through |
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– use 568A standard on one side of the cable and 568B standard on the other side |
Crossovercables |
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___ devices transmit on pins 1 and 2and receive on pins 3 and 6 |
MDI |
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____ devicesreceive on pins 1 and 2 and transmit on pins 3 and 6 |
MDI-X |
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•Bits are transmitted as pulses oflight instead of electricity |
Fibre-optic cable |
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Eachfiber-optic strand carries data in |
onlyone direction |
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Fiber-opticcable used as backbone cabling often comes in bundles |
Of 12 or more strands |
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–Include a single, small-diameterfiber at the core (8 microns) |
Single-mode Fibre |
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–Uses a considerably largerdiameter fiber at the core (50 and 62.5 microns) |
Multi-mode fiber |