AsysmmetrisencableMadeofseveralPairsOfDoubleconductorsCalledCoreWiresinaProtectivesHeath.InorderToreDucetHeInterferenceBetwePlairs ofwires, jokainen pairofwiresismadeToatWistShape, joka on sisällytetty.TwistedPairwiresaretwocopperwireswitHADiaMeterof00.32 mm ~ 0.8 mm, joihin.HEEDIVIDEDIDOUNSHIELDEDTWISTEDPAIR (UTP) AndshideDtWistPair (ShidededTwisedPair, STP) Twokinds.MultiplairsoftWisedPairsInToACablEreSymetRicalCables.ThecorewireofthesymetricalcableSthinnerthantheOpenwire, withiadiaMeterof0000.4mm ~ 1.4 mm, sitSlossislargerthantHatoftheOpenwire, ButThePerformanceMorEntable.SymmetricalCableseRewidelyPuleForUSerAccessCircuitsInLewiredTelephonenetworks.Theamplitude-fraencyCharacteristicsOfsymmetricalCableSareOflow-PasStype ja thecrosStanckincreasesasthefrequencyRises, stetedegreeofMultipleksingisnothigh.
Määritelmä
SymmetricalCable: ConsistoftWowireswiththesamequality, WireDiaMeterandInsulationResisanceToground jaSinsuloituwiresformapairofTransmissionLoops, ja yritysten kommunikointiCableFormedByTwistingMultiplePairsOfsuchwires.
Kiinalainen nimi: symmetrinen kaapeli
ForeignName: SymmetricalCable
Alternativename: Ei mitään
Sovellusaihe: Tietoviestintä
Ominaisuudet: SameresistenceGround, Twoidenticalwires, TransmissionLoop, kiertäminen
TwoidenticalWiresaretWistEdTogetherRCommunication.ItSeemsThatthishasbecomeSymmetricalcalcable, ButthingsarenotThatSimple.Kuvio 1ShowsApictureofasymetricalCableForOfficeuse.Wewillintroducethestructureofsymmetricalcableagain:
Kuvio 1SymmetricalCableForLocaluse
Eristyslaji
TheconductorsinsymmetricalCablesGenerallyUSECOpperwires, WithAwirediaMeterOF0.25 mmTo1.4mm.TheDiametherOfthesymmetricalCableDucitySusUsUs0.4mm ～ 0.9 mm; thediaMetSymmetricalCablePustForthelongdistanceisUsUs1.2 mm.InafewCases, symmetriset.
AsfortheinsulationMaterialSofsymmetricalCables
1) Paperi: Paperilla eristetty kaapeli ShaveThreeforms: Paperipussi, Pulpandrope.Themethodofropeinsulationististowindtheropeinaspiralonthewire, ja theNwrapitwith1to2layersofPapertape.
2) Polyvinyylikloridi: ThedielectricConstantDielcriclossofpolyvinyyliChloridearerelactivedLarge, SoiuthimitionToshort-DistinesymetricalCables.Kuitenkin thecableofTismaterialHasfame-RetartrantPropertiesandCanbeUnedforindoorwiring.
3) Polyolefinandpolystyreeni: thesetwomaterialShavegoodhigh-taajuussuoritukset, andRecommonlypudechablestTransMitsignalsatthemegahertzlevelorbelowtHetTertriffergroup.Polystyreenisususalmadebyles.Andpolyolefinsimalsusesolid, vaahtofoamleather.
InorderTofacilitate Tunnistaminen, erilaiset käyttäjät, jotka.
Juonekalvo
"CommunicationCable" -sarjassa.
1) 2Or4insulationwiresaretWistEdIntoa2-WireGroupora4-WireGroupWithanaPPrateTwist.Foora4-Wiregroup, kun katseltiin,.
2;.
3) Kerrosjuosteinen tyyli: TwistseveralwireGroupsinToACableCoreInlayers.
4) Untittepe: FirstWistsSeveralWireGroupsInToDivedentUnit jaThentWistSeveralUnitsIntoCableCores.
OnTheoutSideOfThelineGroup, erilainen ColortiemarksareoftenusedToDistishishIfferentLineGroups.
Tupla
InordertoensurethesfetyofsymmetricalCables, wraptapeontheoutideOftheCablecore ja.
1) Paper-eristettyjen japolystyrenerope-tapeinsulodCableSRequiretheuseofaseAledTuplaheath.Leadseadsheathswereted, Andlater, alumiini-suljettujensheathswerealSoused.Unettomuudet, analumini-polyetyleenibondedsheathisalseed, jokaisemi-hermeettiset heatheath.
2) Forindoorcables, vaippavapauton (orhalogeenittomat) materiaalit.
OnSidefthesheath, mukaan.
Vähentää häiriöitä
InthedesignandManufuctureofsymmetricalCables, ScientificandTechnologyWorkersHaveTakenVariousMeasures.InorderToreDucetheIMAcTOfnear-endCrosSTalkbetweenloopsonTransMissionLinesindifferentDirections, ScienceShathethoughtOfothermethods:
1) DualCableSystem: TwoloopsThatarenotinthesMecableHavethesamethefrequencyfortwo-WayTransmission.
2) SingleCables System: aceyoneloopisusedFortwo-WayTransmissionAtDifferentFrequences.
3) SNERSHIELD: JoskusspecialShieldisuledToseParateTheCableCoreInToToPartsinaCableToReplacetWoCables.Wecallthistypeofcableaninnershieldedcable.