CN1890761A - 有顺捻缆芯断面的数据电缆 - Google Patents
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Abstract
本发明揭示包括众多绝缘导线双绞线和安排在众多绝缘导线双绞线之间把众多绝缘导线双绞线之中的至少一条双绞线与众多绝缘导线双绞线中其它的双绞线分开的核心的电缆。在一个例子中,电缆可能包括有多个突起的护套。在另一个例子中,核心可能包括一个或多个的收缩点以使核心的断裂变得容易。在又一个例子中,两根或多根电缆可能被捆扎在一起,有可能被拧在一起,以形成捆扎电缆。
Description
本发明的背景
1.本发明的技术领域
本发明涉及使用至少两条双绞线的高速数据通信电缆。更具体地说,它涉及有定义众多个别线对沟道的中央核心的电缆。
2.本发明的现有技术
高速数据通信媒体包括双拧在一起形成平衡传输线的数对电线。这样的数对电线被称为双绞线。用于高速数据通信的一种常见类型的传统电缆包括众多双绞线,为了形成电缆所述众多双绞线可能被捆扎和拧紧(成缆)在一起。
现代的通信电缆必须满足适合高频传输要求的电性能特性。电信工业协会和电子工业协会(TIA/EIA)已制定用于电缆阻抗、衰减、扭曲和串音隔离的特定类别性能的标准。当双绞线被接近地放置的时候,例如在电缆中,电能可能从电缆的一个线对转移到另一个线对中。这种在线对之间转移的能量被称为串音而且通常是不受欢迎的。TIA/EIA已限定串音标准,包括TIA/EIA-568A。国际电工技术委员会(IEC)也已经限定用于数据通信电缆串音的标准,包括ISO/IEC 11801。一个用于100Ω电缆的高性能标准为是ISO/IEC 11801,5类,另一个是ISO/IEC 11801,6类。
在传统的电缆中,电缆中的每根双绞线都有沿着纵向方向规定的扭曲之间的距离,该距离被称为线对绞矩。当毗邻的双绞线有相同的线对绞矩和/或扭转方向的时候,它们倾向于比它们有不同的线对绞矩和/或扭转方向的时候更紧密地平放在电缆里面。这种紧密的间隔可能增加在毗邻线对之间发生的不受欢迎的串音的数量。所以,在一些传统的电缆中,在电缆里面的每条双绞线可能有独特的线对绞矩以便增加线对之间的间隔并借此减少电缆中双绞线之间的串音。扭转方向可能是不同的。
除了改变线对绞矩和扭转方向以外,有时使用个别的固体金属或编织的金属线对屏蔽来电磁隔离线对。屏蔽电缆虽然呈现较好的串音隔绝,但是其安装和端接都是比较困难的和费时的。被屏蔽的导线通常是使用适合该任务的专用工具、装置和技术端接的。
一种满足上述规范的通用的电缆类型是无屏蔽双绞线(UTP)电缆。因为它不包括被屏蔽的导线,所以UTP是安装者和工厂经理优选的,因为它可能容易安装和端接。然而,传统的UTP即使在使用改变的线对绞矩的时候也可能无法实现现代化传输系统所需要的上好的串音隔绝。
解决双绞线在电缆里面太接近地平放在一起的问题的另一种方法体现在Belden Wire & Cable Company制造的屏蔽电缆(产品编号1711A)之中。这种电缆包括沿径向安排在“星”形核心附近的四条双绞线媒体。每条双绞线放置在“星”形核心的两个鳍状物之间,借助核心与毗邻的双绞线分开。这帮助减少和稳定双绞线媒体之间的串音。然而,该核心尽管实现仅仅大约5分贝的串音减少但是把相当高的成本以及可能形成火灾的危险材料(下面将予以解释)加到电缆上。此外,为了维持预期的电特性,在电缆里面屏蔽与线对极为接近实质上需要更大的绝缘厚度。这把更多的绝缘材料加到该构造中并且增加成本。
在建筑设计方面,采取了许多预防措施以便万一着火阻碍遍及建筑物的火焰传播和烟雾的产生和传播。显然,避免人员伤亡和把电器和其它设备的破坏造成的火灾损失减到最少是人们所期望的。所以,用于建筑物安装的电线和电缆要遵从国家电气规程(NEC)和/或加拿大电气规程(CEC)的各种不同的阻燃要求。
NEC或CEC明确地要求打算安装在建筑物的空气调节空间(即,压力通风系统、管道等)的电缆通过Underwriters LaboratoriesInc.(UL),UL-910或它的加拿大标准协会(CSA)的等价文件,FT6规定的火焰测试。UL-910和FT6代表分别由NEC和CEC建立的火灾等级评定体系的顶端。拥有这个通常称为“压力通风系统”或“压力通风系统额定”的等级的电缆可能被有较低等级的(即,CMR、CM、CMX、FT4、FT1或它们的同等物)的电缆代替,而额定值较低的电缆可能不被用在需要为压力通风系统设计的电缆的场合。
符合NEC或CEC要求的电缆以拥有上好的阻燃性为特色,与着火等级较低的电缆相比在着火期间更能抵抗火焰传播和产生低水平的烟雾。安装在增压室中的数据级通信电缆的传统设计有产生少量烟雾的护套材料(例如,PVC配方或含氟聚合物材料)包裹双绞导线的核心,每根导线用氟化乙烯丙烯(FEP)绝缘层单独绝缘。如上所述生产的电缆满足公认的压力通风系统测试要求(例如,Underwriters Laboratories,Inc.的“峰值烟雾”和“平均烟雾”要求,UL910 Steiner测试和/或加拿大的标准协会CSA-FT6(压力通风系统火焰测试)),同时实现符合EIA/TIA-568A的预期的适合高频信号传输的电性能。
虽然上述的传统电缆(包括Belden 1711A电缆)部份地由于它们使用FEP满足所有的上述设计标准,使用氟化乙烯丙烯费用极为昂贵而且可能占为供压力通风系统使用而设计的电缆的成本的60%。
Belden 1711A电缆的较大的固体核心还可能为电缆着火提供大量的燃料。形成耐火材料(例如,FEP)的核心由于核心所用材料的体积非常昂贵。耐火/抑制烟雾的固体聚烯烃可能被用在与FEP的组合中。然而,市场上买得到的耐火/抑制烟雾的固体聚烯烃化合物全都有不如FEP的介电性质。除此之外,它们还在燃烧条件下呈现比FEP差的阻燃性而且通常产生比FEP多的烟雾。
发明内容
依照一个实施方案,数据电缆包括众多绝缘导线双绞线(包括第一双绞线和第二双绞线)和安排在众多绝缘导线双绞线之间沿着数据电缆的长度把第一双绞线和第二双绞线分开的核心,其中所述核心包括至少一个收缩点,在那里核心的直径实质上相对于核心的最大直径有所减少。
在另一个实施方案中,屏蔽电缆包括众多绝缘导线双绞线(包括第一双绞线和第二双绞线)、安排在众多绝缘导线双绞线之间沿着数据电缆的长度把第一双绞线和第二双绞线分开的核心、包裹核心和众多绝缘导线双绞线的双层护套(该双层护套包括第一护套层和第二护套层)和安排在第一护套层和第二护套层之间的导电屏蔽层。
依照另一个实施方案,捆扎电缆由包括众多绝缘导线双绞线和安排在众多双绞线之间把众多双绞线之一与众多双绞线之中其它的双绞线分开的第一隔离物的第一电缆(第一电缆有第一护套),和包括众多绝缘导线双绞线和安排在众多双绞线之间把众多双绞线之一与众多双绞线之中其它的双绞线分开的第二隔离物的第二电缆(第二电缆有第二护套)组成,其中第一和第二护套每个都包含多个突起。在一个例子中,第一和第二护套各自的多个突起都是向外突出的,而且第一和第二护套适合彼此配对以便把第一电缆锁定到第二电缆上。在另一个例子中,第一或第二护套的多个突起是向内突出的。
依照另一个实施方案,电缆由包括第一双绞线和第二双绞线在内的众多绝缘导线双绞线、安排在众多绝缘导线双绞线之间把第一双绞线和第二者双绞线分开的核心和围住众多绝缘导线双绞线和核心的护套,其中第一双绞线有第一绞矩和第一绝缘厚度,第二双绞线有小于第一绞矩的第二绞矩和第二绝缘厚度,而且第一和第二双绞线之间的歪斜不足大约7纳秒。
附图说明
在这些不打算依比例绘制的附图中,用各种不同的附图举例说明的每个相同的或几乎相同的成份是用相似的数字表示的。出于清楚的目的,并非每个成份在每幅附图中都被标注出来。这些附图是为举例说明和解释准备的,不打算作为本发明限度的定义。在这些附图中:
图1是依照本发明的一个实施方案的电缆核心的剖视图;
图2是依照本发明的穿孔核心的一个实施方案的透视图;
图3是包括图1的核心的电缆的一个实施方案的剖视图;
图4是在本发明的一些电缆实施方案中使用的电缆核心的另一个实施方案的剖视图;
图5是依照本发明由不同绞矩的双绞线组成电缆的一个实施方案的例证;
图6是绝缘导线双绞线的剖视图;
图7是依照本发明的导线双绞线的阻抗随频率变化的曲线图;
图8是图7的双绞线的回波损耗随频率变化的曲线图;
图9A是依照本发明有双层护套的电缆的透视图;
图9B是沿着图9A中的B-B线截取的图9A所示电缆的剖视图;
图10是依照本发明的捆扎电缆的一个实施方案的透视图,举例说明振动式成缆;
图11是依照本发明包括众多有互锁条纹护套的电缆的捆扎电缆的另一个实施方案的例证;
图12是依照本发明包括众多有条纹护套的电缆的捆扎电缆的另一个实施方案的透视图;而
图13是依照本发明护套有向内延伸的突起的电缆的又一个实施方案的例证。
具体实施方式
各种不同的说明性实施方案及其各个方面现在将参照附图予以详细地描述。人们将领会到这项发明在它的应用方面不局限于在下面的描述中陈述的或在附图中举例说明的构造细节和成份安排。本发明可以有其它的实施方案和以各种不同的方式实践或完成。另外,在此使用的措辞和用辞是为了描述而不应该被视为限制。“包括”、“组成”或“有”、“包含”、“包括”及其在本文中的变化的使用意味着囊括其后列出的项目及其等价物和附加项目。
参照图1,举例说明包括有下面描述的断面用四根双绞线103架设成的电缆的挤出核心101的电缆的各部分的一个实施方案。虽然下面的描述将以其构造包括四根绝缘导线双绞线和一个有独特断面的核心的电缆为主,但是人们将领会到本发明不局限于在这个实施方案中使用的线对数目或断面。本发明的原则能适用于包括更多或更少的双绞线和不同的核心断面的电缆。另外,虽然本发明的这个实施方案是结合双绞线数据通信媒体予以描述和举例说明的,但是其它的高速数据通信媒体能被用在依照本发明的电缆结构中。
如图1所示,依照本发明的一个实施方案,挤出核心断面可能有“十字形”的初始形状,提供四个空间或沟道105,在核心101的每对鳍状物102之间提供一个。每个沟道105支撑在成缆操作期间放在沟道105里面的一根双绞线103。用于举例说明的核心101和断面不应该被看作是限制。核心101可能用一些不同于挤出的其它工艺制作而且可能有不同的初始形状或沟道数目。举例来说,如图1所示,核心可能有非必选的中心沟道107,该沟道可能支撑,举例来说,光纤元素或强度元素109。除此之外,在一些例子中,在每个沟道105之内可能放置不止一根双绞线103。
上述的实施方案能使用许多不同的材料构成。虽然本发明不局限于现在给出的材料,但是使用这些材料实践本发明是有利的。核心材料应该是传导性材料或包含粉末状的铁酸盐,核心材料通常与在数据通信电缆应用中的使用兼容,包括任何可适用的防火标准。在非压力通风系统应用中,核心能用实心的或发泡的阻燃聚烯烃或相似的材料制成。核心也可能用非阻燃材料制成。在压力通风系统应用中,核心可能是下述化合物中的任何一种或多种:固体低介电常数含氟聚合物,例如,乙烯氯化三氟乙烯(E-CTFE)或氟化乙烯丙烯(FEP)、发泡的含氟聚合物,例如,发泡的FEP、以及呈固体低电介体常数形式的或发泡的聚氯乙烯(PVC)。填料被加到化合物使挤出产品变成传导性的。适当的填料是与被混入的化合物相容的那些,包括但不限于粉末状铁酸盐、半导体热塑弹性体和碳黑。核心的导电率有助于进一步使双绞线彼此绝缘。
传统的包括非传导性核心的四线对电缆(例如,Belden 1711A电缆)优于类似的没有核心的四线对电缆减少标称串音多达5分贝。通过使核心变成传导性的,串音被进一步减少5分贝。因为核心负荷和护套构造两者都能影响串音,这些数字把电缆与类似的负荷和护套构造作比较。
依照前面的讨论,核心101可能有多种不同的断面而且可能是传导性的或非传导性的。依照一个实施方案,核心101可能进一步包括可能帮助从电缆中拆除核心101的特征。举例来说,参照图2,核心101可能有变窄的或刻凹痕的区段111,该区段在此被称为“收缩点”。在刻凹痕的区段或收缩点,核心101的直径或尺寸与核心101(在核心的非收缩点区段)的正常尺寸相比被减少。因此,收缩点111提供可能比较容易掰断核心101的点。收缩点111可以沿着核心的长度充当“孔眼”,使核心在这些点容易折断,这依次可以使从电缆中拆除某些段核心101变得容易。这对于能够容易地折断核心使电缆易于接到,举例来说,电话或数据插座或插头上可能是有利的。在一个例子中,收缩点111可以沿着电缆的长度按照大约0.5英寸的间隔放置。收缩点111应该足够小,以致双绞线可以骑在收缩点111上,实质上没有浸渍通过刻痕区段111靠在一起。在一个例子中,收缩点是在核心的挤出期间通过每次在希望形成收缩点111的比较短的时间周期里拉伸核心形成的。在挤出期间拉伸核心导致在核心中正在形成的“变薄”或变窄的区段,这些区段形成收缩点111。
电缆可以以几种方法之中的任何一种方法完成,举例来说,如图3所示。组合在一起的核心101和双绞线103可以非必选地用捆缚物113缠绕,然后装上护套115,形成电缆117。在一个例子中,全部的传导性屏蔽层117可以非必选地在装护套之前加到捆缚物111上以防止电缆引起或接受电磁干扰。护套115可以是PVC材料或前面就核心101讨论过的材料中的另一种材料。捆缚物113可以是,举例来说,可能是聚酯或另一种通常与数据通信电缆应用相容(包括任何可适用的防火标准)的化合物的绝缘带。人们将领会到电缆能在没有捆缚物和传导性屏蔽层之一或两者的情况下完成,举例来说,通过提供护套。
如同在这种技术中已知的那样,当多种元素一起形成电缆的时候,全部的扭曲都被赋予组件以改善几何稳定性和帮助避免分离。在制造本发明的电缆的工艺的一些实施方案中,核心断面连同个别双绞线一起的扭曲是受控的。该工艺包括提供挤出的核心以维持双绞线之间的实际间隔和维持电缆之内的几何稳定性。因此,该工艺通过把传导性核心放到电缆中维持线对间隔帮助实现和维持高水平的串音隔绝。
依照另一个实施方案,更高水平的串音隔绝可以在图4的构造中通过使用传导性屏蔽层119,例如,与核心101的鳍状物102的末端121接触的金属编织物、固体金属箔屏蔽层或传导性塑料层来实现。在这样的实施方案中,核心优选是传导性的。这样的构造与用于串音隔绝的双绞线个别屏隔相匹敌。这种构造能非必选地有利地包括安排在中心沟道107中的排扰线123,如图4所示。在一些例子中,有核心101的鳍状物102延伸到稍微超出双绞线的外部尺寸定义的边界103可能是有利的。如图4所示,这有助于保证双绞线103在给电缆装护套之前不逃离它们各自的沟道105,也可能有助于鳍状物102和屏蔽119之间良好的接触。在举例说明的例子中,如果核心材料是比较软的材料(例如,PVC),封闭和给电缆117装护套可以使鳍状物102的末端121略微弯曲,如图所示。
在一些实施方案中,尤其是在核心101可能是非导体的情况下,通过改变每条双绞线103的绞矩在双绞线103之间提供附加的串音隔绝可能是有利的。举例来说,参照图5,电缆117可以包括第一双绞线103a和第二双绞线103b。每条双绞线103a、103b包括两根用绝缘层127a、127b绝缘的金属线125a、125b。如图5所示,第一双绞线103a可能有比第二双绞线103b的绞矩长度短的绞矩长度。
依照前面的讨论,改变电缆中双绞线之间的绞矩长度可能有助于减少双绞线之间的串音。然而,线对的绞矩长度越短,线对的“未绞合的长度”就越长,并因此加到通过双绞线传播的电信号上的信号相位延迟就越大。人们将理解术语“未绞合长度”在此表示当双绞导线没有绞矩的时候(即,当双绞导线未被绞合的时候)双绞导线的电学长度。所以,在电缆里面的双绞线之间使用不同的绞矩可以引起加到通过导线对之中不同的导线对传播的信号上的相位延迟改变。人们将领会到就这份说明书而言术语“歪斜”是对于电缆的众多双绞线之中的每条双绞线加到电信号上的相位延迟的差。所以,歪斜可能起因于电缆中有不同绞矩的双绞线。依照前面的讨论,TIA/EIA已提出规定电缆(例如,5类或6类的电缆)必须满足某种歪斜要求的规范。
除此之外,为了使电缆与负荷的(例如,网络成份)阻抗匹配,电缆的阻抗可以用特定的特性阻抗来分类。举例来说,许多射频(RF)成份可能有50欧姆或100欧姆的特性阻抗。所以,许多高频电缆可能类似地用50欧姆或100欧姆的特性阻抗来分类以有利于不同射频负荷的连接。电缆的特性阻抗通常可以以构成电缆的每条双绞线的个别标称阻抗的合成物为基础确定。参照图6,双绞线103a的标称阻抗可能涉及几个参数,包括构成电缆的双绞线的电线125a和125b的直径、在双绞线的导线之间从中心到中心的距离d,后者本身又可能取决于绝缘层127a、127b的厚度和所用的导线绝缘材料的介电常数。
每个线对的标称特性阻抗可以通过测量该双绞线在某个频率范围(例如,预期的电缆工作频率范围)的输入阻抗来确定。然后,在该电缆的工作频率范围内每个实测的输入阻抗的曲线拟合(举例来说,多达801个实测点)可以用来确定构成电缆的每条双绞线的“拟合”特性阻抗和整个电缆的拟合特性阻抗。TIA/EIA用于特性阻抗的规范是根据这个拟合特性阻抗给出的。举例来说,用于5类或6类的100欧姆电缆的规范是对于100MHz和350MHz之间的频率为为100欧姆±15欧姆,而对于100MHz以下的频率为100欧姆±12欧姆。
在传统的制造业中,通常认为更有利的是为实现尽可能接近规定的电缆特性阻抗(通常在正负2欧姆范围内)设计和制造双绞线。这样做的主要理由是考虑到在制造双绞线和电缆期间可能发生的阻抗变化。特定的双绞线进一步远离规定的特性阻抗,就越有可能在任何特定频率下瞬间偏离规定的特性阻抗,因为阻抗粗糙度将会超过电缆的输入阻抗和回波损耗两者的极限。
随着覆盖双绞线的导线的绝缘材料的介电常数逐渐减少,通过双绞导线的信号的传播速度增加,而当信号通过双绞线行进时加到信号上相位延迟减少。换句话说,信号通过双绞导线的传播速度与绝缘材料的介电常数成反比,而附加的相位延迟与绝缘材料的介电常数成正比。举例来说,再一次参照图6,对于所谓的“快速”绝缘体,例如氟化乙烯丙烯(FEP),信号通过双绞线103a的传播速度可能是大约0.69c(其中c是真空中的光速)。对于“慢速”绝缘体,例如聚乙烯,信号通过双绞线103a的传播速度可能是大约0.66c。
隔离材料的有效介电常数可能还至少部份地取决于绝缘层的厚度。这是因为有效的介电常数可能是绝缘材料本身的介电常数与周围空气组合的合成物。所以,信号通过双绞线的传播速度可能还取决于那条双绞线的绝缘层厚度。然而,依照前面的讨论,双绞线的特性阻抗也取决于绝缘层厚度。
申请人已经认识到通过相对于电缆中每条双绞线的绞矩优化绝缘直径,歪斜能得到实质性的减少。虽然在改善的制造工艺条件下改变绝缘直径可能引起双绞线特性阻抗值的变化,但是阻抗的频率粗糙度(即,在工作频率范围内任何一条双绞线的阻抗变化)能受控地减少,因此在仍然满足阻抗规范的同时考虑到对歪斜进行优化的设计。
依照本发明的一个实施方案,电缆可以包括众多绝缘导线双绞线,其中线对绞矩比较长的双绞线有相对比较高的特性阻抗和比较大的绝缘直径,而线对绞矩比较短的双绞线有相对比较低的特性阻抗和比较小的绝缘直径。以这种方式,线对绞矩和绝缘厚度可以受到控制以便减少电缆的总歪斜。这种使用聚乙烯绝缘层的电缆的一个例子在下面的表1中给出。
表1
双绞线 | 绞矩长度(英寸) | 绝缘直径(英寸) |
1 | 0.504 | 0.042 |
2 | 0.744 | 0.040 |
3 | 0.543 | 0.041 |
4 | 0.898 | 0.040 |
这个概念可以参照图7和图8得到较好的理解,图7和图8分别举例说明就双绞线1(例如,电缆117中的双绞线103a)而言实测的输入阻抗随频率变化的曲线图和回波损耗随频率变化的曲线图。参照图7,该双绞线(在工作频率范围内)的“拟合”特性阻抗131可以依据在工作频率范围内实测的输入阻抗133确定。线135指出双绞线输入阻抗的5/6类规范范围。如图7所示,在电缆117的工作频率范围内实测的输入阻抗133落在规定的范围内。参照图8,举例说明对于双绞线103a对应的回波损耗随频率变化的曲线图。线137指出在工作频率范围内回波损耗的5/6类规范。如图8所示,在电缆的工作频率范围内实测的回波损耗139在规定的界限以上(因此,在规范范围内)。因此,该特性阻抗可能被允许如有必要进一步偏离预期的100欧姆,以减少歪斜。同样,其它双绞线的绞矩和绝缘厚度可以为了在满足阻抗规范的同时减少电缆的歪斜而被进一步改变。
依照另一个实施方案,设计了使用比较慢的绝缘材料(例如,聚乙烯)和使用与表1所示相同的线对绞矩的四线对电缆,其中所有的绝缘直径都被设定为0.041英寸。这种电缆呈现大约8纳秒/100米的歪斜减少(相对于上述的传统电缆——这种电缆实测结果是有大约21纳秒的最坏情形的歪斜,反之传统的阻抗被优化的电缆呈现大约30纳秒以上的歪斜),然而个别线对的阻抗偏离标称值在0到2.5欧姆的范围内,从而为进一步的阻抗偏移并因此为歪斜减少留下许多余地。
在双绞线特性阻抗方面允许相对于标称阻抗值有某种偏离考虑到比较大的绝缘直径范围。对于给定的线对绞矩,较小的直径导致较小线对角度和较短的未绞合线对长度。相反,较大的线对直径导致较大的线对角度和较长的未绞合线对长度。在较紧的线对绞矩将正常地需要适合100欧姆的0.043英寸的绝缘直径的情况下,0.041英寸的绝缘直径将会产生被减少到大约98欧姆的阻抗。使用同一绝缘材料的较长的线对绞矩将需要适合100欧姆的较小的大约0.039英寸的绝缘直径,而0.041英寸的直径将会产生大约103欧姆。如图7和图8所示,允许这个“目标”阻抗偏离100欧姆的变化可能不妨碍双绞线和电缆满足输入阻抗规范,但是可以允许改善电缆中的歪斜。
依照图9A和9B举例说明的另一个实施方案,电缆117可以有双层护套141,包括第一层内层143和第二层外层145。如图所示,非必选的传导性屏蔽层147可以放在第一和第二护套层143、145之间。屏蔽层147可以起避免在毗邻的或附近的电缆之间的串音,通常称之为外来串音。屏蔽层147可以是,举例来说,沿着电缆的长度部份地或实质上围绕着第一护套层143延伸的金属编织物或箔。屏蔽层147可以借助第一护套层143与双绞线103绝缘并因此可能对双绞线有微弱的影响。这可能是有利的,因为可能需要对,举例来说,双绞线103的导线或绝缘厚度进行小的调整或不调整。第一和第二护套层可以是任何适当的护套材料,例如,PVC、含氟聚合物、防火和/或烟雾的材料,等等。在这个实施方案中,因为屏蔽层是借助第一护套层143与双绞线103和隔离物101绝缘的,该隔离物101可以是传导性的或非传导性的。
依照另一个实施方案,几根电缆(例如,上述的那些)可以被捆扎在一起提供捆扎电缆。在捆扎电缆里面可以提供很多上述电缆的实施方案。举例来说,捆扎电缆可以包括一些有屏蔽层的电缆和一些无屏蔽层的电缆、一些四线对电缆和一些有不同线对数目的电缆。除此之外,构成捆扎电缆的电缆可以包括有各种不同的断面的传导性的或非传导性的核心。在一个例子中,构成捆扎电缆的多样的电缆可以呈螺旋状地拧在一起并且用捆缚物缠绕。捆扎电缆可以包括一根撕裂索以便破坏捆缚物和释放捆扎电缆中的个别电缆。
依照图10举例说明的一个实施方案,捆扎电缆151可能是沿着它的长度以振动方式成缆的,而不是沿着电缆的长度按照一个单一的方向成缆的。换句话说,电缆沿着它的长度绞合(成缆)的方向可以周期性地改变,举例来说,从顺时针方向扭绞到逆时针的扭绞,反之亦然。这在本领域中称之为SZ型成缆而且可能需要称之为振动成缆机的专用绞合机。在捆扎电缆151的一些例子中,构成捆扎电缆151的每根个别电缆117本身可能是呈螺旋状绞合(成缆)的,有特定的电缆绞矩长度,举例来说,大约5英寸。每根电缆的电缆绞矩可能倾向于松开(如果沿着相反的方向)或拧紧(如果沿着同一方向)构成该电缆的每条双绞线的绞矩。如果捆扎电缆151是沿着它的整个长度按照同一方向成缆的,这个总的电缆绞矩可能进一步倾向于松开或拧紧每根双绞线的绞矩。双绞线的绞矩的这种改变可能对构成捆扎电缆151的至少一些双绞线和/或电缆117的性能有不利的影响。然而,呈螺旋状绞合捆扎电缆可能是有利的,因为它可以允许捆扎电缆更容易弯曲,举例来说,在储藏时或在角落周围安装的时候。通过周期性地反转捆扎电缆的绞矩,捆扎绞合的对个别电缆的任何影响实质上可以被消除。在一个例子中,捆扎电缆的绞矩可能是沿着任一方向大约20英寸。如图10所示,捆扎电缆可能对于某个绞矩编号(区域153)是沿着第一方向绞合的,然后,对于某个长度(区域155)是未绞合的,然后,对于某个绞矩编号(区域157)是沿着相反的方向绞合的。
参照图11,它举例说明依照本发明的捆扎电缆161的另一个实施方案。在这个实施方案中,构成捆扎电缆161的一根或多根个别的电缆117可以有带条纹的护套163,如图所示。带条纹的护套163可以有多个沿着护套163的圆周被隔开的突起165。在一个例子中,电缆117可能不是用电缆绞矩绞合的。在这个例子中,突起165经过构建以致一个护套163a的突起165a可以与另一个护套163b的突起165b配对,以便把两根对应的电缆117a、117b锁定在一起。因此,构成捆扎电缆161的个别电缆117可以“啪的一声”扣合在一起,从而有可能不需要维持捆扎电缆161的捆缚物。这个实施方案可能是有利的,因为电缆117在必要时可以很容易地彼此分开。
在另一个例子中,个别的电缆117可以与电缆螺旋式地拧在一起。在这个例子中,突起165可以沿着电缆117的长度形成螺旋状的脊,如图12所示。因此,突起165可以用来进一步把一根电缆117a与另一根117b分开,并可以借此起减少电缆117a、117b之间的外来串音。举例来说,众多电缆117可以用捆缚物167缠绕,以便把电缆117捆扎在一起形成捆扎电缆161。
依照另一个实施方案,电缆117可以有多个向内延伸的突起173的带条纹的护套171,如图13所示。这样的护套构造可能是有利的,因为与传统的护套相比较这些突起可以导致有比较多的空气把护套171与双绞线103分开。因此,护套材料对双绞线103的工作特性可能有相对比较少的影响。举例来说,双绞线可能由于增加了双绞线103周围的空气而呈现较少的衰减。除此之外,因为护套171可以借助突起173进一步保持远离双绞线103,所以突起173可能有助于减少捆扎电缆175中毗邻电缆117之间的外来串音。举例来说,电缆117可以再一次用聚合体捆缚物177缠绕,以形成捆扎电缆175。
至此已描述了这项发明的至少一个实施方案的一些方面,人们将领会到对于熟悉这项技术的人各种不同的变更、修改和改进将很容易发生。举例来说,在此描述的任何电缆都可能包括任何数目的双绞线,而在此展示的任何护套、绝缘层和隔离物可能包含任何适当的材料。除此之外,隔离物可以是任何形状的,例如但不限于十字形或星形,或扁平带等等,而且可以被放置在电缆里面把一根或多根双绞线彼此分开。这样的和其它的变更、修改和改进倾向于作为这份揭示的一部份并且倾向于落在本发明的范围之内。因此,前面的描述和附图仅仅是作为例子。
Claims (17)
1.一种制造数据电缆的方法,其中包括如下步骤:
用核心材料挤制核心;以及
把核心与众多包括第一双绞线和第二双绞线的绝缘导线双绞线安排在一起,其中核心被安排在众多绝缘导线双绞线之间以便沿着数据电缆的长度把第一双绞线和第二双绞线分开;以及
给核心和多个双绞线装护套以形成数据电缆;
其中挤制核心的步骤包括在挤出期间按多个间隔拉伸核心材料以便沿着核心的长度形成对应的多个收缩点以致核心在收缩点的直径相对于核心的最大直径大幅度减少。
2.根据权利要求1的方法,其中挤制核心的步骤包括挤出核心以致该核心包含多个从核心的中心向外延伸定义众多沟道的鳍状物,以及其中的安排步骤包括排列核心和众多双绞线以致在众多沟道之中的每条沟道里面至少安排一条绝缘导线双绞线。
3.根据权利要求1的方法,其中装护套的步骤包括用有多个沿着护套的圆周安排的向内突出的突起的护套给核心和多个双绞线装护套。
4.一种形成捆扎电缆的方法,该方法包括用捆缚物缠绕众多电缆,其中众多电缆包括用权利要求3的方法形成的电缆。
5.根据权利要求1的方法,其中装护套的步骤包括用有多个沿着护套的圆周安排的向外突出的突起的护套给核心和多个双绞线装护套。
6.一种形成包含用权利要求5的方法形成的第一和第二电缆的捆扎电缆的方法,该方法包括把第一电缆的护套和第二电缆的护套组合在一起的步骤,以致多个突起互锁使第一电缆和第二电缆结合在一起。
7.一种屏蔽电缆,其中包括:
众多包括第一双绞线和第二双绞线的绝缘导线双绞线;
安排在众多绝缘导线双绞线之间沿着数据电缆的长度把第一双绞线和第二双绞线分开的核心;
包裹核心和众多绝缘导线双绞线的双层护套,该双层护套包括第一护套层和第二护套层;以及
安排在第一护套层和第二护套层之间的导电屏蔽层。
8.根据权利要求7的屏蔽电缆,其中核心包括沿着核心的长度排列的多个收缩点,该核心在多个收缩点之中的每个收缩点的直径与核心的最大直径相比都被大幅度减少。
9.一种捆扎电缆,其中包括:
包括众多绝缘导线双绞线和安排在众多双绞线之间把众多双绞线之一与众多双绞线之中的其它双绞线分开的第一隔离物的第一电缆,该第一电缆有第一护套;以及
包括众多绝缘导线双绞线和安排在众多双绞线之间把众多双绞线之一与众多双绞线之中的其它双绞线分开的第二隔离物的第二电缆,该第二电缆有第二护套;
其中第一和第二护套每个都包含多个突起。
10.根据权利要求9的捆扎电缆,其中第一护套的多个突起是向内突出的。
11.根据权利要求10的捆扎电缆,其中第二护套的多个突起是向内突出的。
12.根据权利要求9的捆扎电缆,其中第一和第二护套上多个突起每个都是向外突出的,而且第一和第二护套适合彼此配对把第一电缆锁定到第二电缆上。
13.根据权利要求12的捆扎电缆,其中第一和第二隔离物是不导电的。
14.根据权利要求9的捆扎电缆,其中捆扎电缆是以振动方式呈螺旋状绞合的,以致该捆扎电缆包括按顺时针方向扭绞的第一区域和按逆时针方向扭绞的第二区域。
15.一种电缆,其中包括:
众多包括第一双绞线和第二双绞线的绝缘导线双绞线;
安排在众多绝缘导线双绞线之间把第一双绞线和第二双绞线分开的核心;以及
围住众多绝缘导线双绞线和核心的护套;
其中第一双绞线有第一绞矩、第一绝缘厚度和第一标称阻抗;
其中第二双绞线有小于第一绞矩的第二绞矩、第二绝缘厚度和低于第一标称阻抗的第二标称阻抗;而且
其中第一和第二绞矩和第一和第二标称阻抗都是通过选定的,以致第一和第二双绞线之间的歪斜小于大约21纳秒/100米,第一和第二标称阻抗之间的差介于大约2欧姆和15欧姆之间。
16.根据权利要求15的电缆,其中第一绝缘厚度与第二绝缘厚度实质上是相同的。
17.根据权利要求15的电缆,其中第一绝缘厚度大于第二绝缘厚度。
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2003
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- 2004-11-09 MX MXPA06005179A patent/MXPA06005179A/es not_active Application Discontinuation
- 2004-11-09 CN CN200480036730A patent/CN100583311C/zh active Active
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2009
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Also Published As
Publication number | Publication date |
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US20090014202A1 (en) | 2009-01-15 |
US20050269125A1 (en) | 2005-12-08 |
US20070044996A1 (en) | 2007-03-01 |
EP1683165B1 (en) | 2013-05-22 |
CA2545161C (en) | 2011-08-02 |
US7491888B2 (en) | 2009-02-17 |
US20090120664A1 (en) | 2009-05-14 |
US7696438B2 (en) | 2010-04-13 |
US7964797B2 (en) | 2011-06-21 |
EP1683165B8 (en) | 2013-07-10 |
US20100147550A1 (en) | 2010-06-17 |
CN100583311C (zh) | 2010-01-20 |
MXPA06005179A (es) | 2007-02-16 |
WO2005048274A3 (en) | 2006-01-05 |
EP1683165A2 (en) | 2006-07-26 |
US7154043B2 (en) | 2006-12-26 |
CA2545161A1 (en) | 2005-05-26 |
WO2005048274A2 (en) | 2005-05-26 |
US7135641B2 (en) | 2006-11-14 |
US20050006132A1 (en) | 2005-01-13 |
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