-
1.发明授权
公开(公告)号：US5113159A
公开(公告)日：1992-05-12
申请号：US483152
申请日：1990-02-22
摘要： A balanced mode transmission system (20) for use in a local area network includes at least one twisted pair of insulated metallic conductors (27--27) which at its end is connected through a transformer to a transmitting computer and to a receiving computer (48). Each pair of conductors adjacent to the transmitting end and optionally adjacent to the receiving end is provided with a longitudinal choke (56,57). Also, a longitudinally extending metallic wire (60) is included in the system and is connected possibly through a resistor to ground at each end. The combination of the longitudinal choke at least adjacent to the transmitting end and the longitudinally extending metallic wire is superbly effective in suppressing electromagnetic interference notwithstanding the absence of shielding.
-
公开(公告)号：US5162609A
公开(公告)日：1992-11-10
申请号：US739122
申请日：1991-07-31
摘要： A fire-resistant cable (20) which is suitable for the transmission of high frequency signals in a local area network includes a core which comprises a plurality of twisted pairs (22,22) of insulated conductors (24,24) and a jacket (35). Each insulated conductor of each pair includes an elongated metallic member (26) and an insulation system (28). The insulation system which is characterized by a suitable low dissipation factor includes dual layers, an outer one of which includes a flame-retardant plastic material. Also, the insulation system is characterized by a suitably low dielectric constant and by compatibility with a relatively short pair twist scheme. In one embodiment, the insulation system includes an inner layer (30) of a polyolefin plastic material and an outer layer (32) of a flame-retardant polyolefin plastic material. The jacket comprises a plastic material characterized by a suitably low dissipation factor and dielectric constant and in a preferred embodiment comprises a flame-retardant polyolefin plastic material. Preferably, the twist length of each pair does not exceed the product of about forty and the outer diameter of an insulated conductor of each pair.
-
3.发明授权Methods of and apparatus for providing substantially error-free transmitted data 失效提供基本上无误差的传输数据的方法和装置
公开(公告)号：US4953206A
公开(公告)日：1990-08-28
申请号：US307144
申请日：1989-02-03
IPC分类号： H04B3/32
CPC分类号： H04B3/32
摘要： In a system (20) for transmitting voice and data signals, insulated metallic conductor pairs (44--44) which transmit data signals and insulated metallic conductor pairs (46--46) which are capable of transmitting voice signals are enclosed in a common sheath system of a single cable (40). User pickup of station apparatus (34) during the generation of a ringing voltage on a voice conductor pair causes that pair to become disturbing and to impart impulse noise to a closely coupled data pair. The data pair is designated a disturbed pair and the signals transmitted thereby may be affected adversely. This problem is overcome by providing a circuit (80) comprising in parallel a resistance and an inductance and being in series with the station apparatus. Such an arrangement reduces substantially that frequency content of any disturbing signal which appears on the disturbing pair and which is in the range of the data signal spectrum. This reduces the magnitude of crosstalk between the voice and data pairs and results in substantially error-free transmitted data.
摘要翻译： 在用于发送语音和数据信号的系统（20）中，传输数据信号的绝缘金属导体对（44-44）和能够发送语音信号的绝缘金属导体对（46-46）封装在公共护套系统 的单个电缆（40）。 在声音导体对上产生振铃电压期间，站装置（34）的用户拾取导致该对变得干扰并且将脉冲噪声给紧密耦合的数据对。 数据对被指定为干扰对，并且由此传输的信号可能受到不利影响。 通过提供并联包括电阻和电感并与站装置串联的电路（80）来克服该问题。 这种布置基本上减少出现在干扰对上并且在数据信号频谱的范围内的任何干扰信号的频率内容。 这减少了语音和数据对之间的串扰的大小，并导致基本上无错误的传输数据。
-
公开(公告)号：US4873393A
公开(公告)日：1989-10-10
申请号：US170500
申请日：1988-03-21
申请人： Harold W. Friesen , Wendell G. Nutt
发明人： Harold W. Friesen , Wendell G. Nutt
摘要： A cable (20) which is particularly suited to the transmission of substantially error-free data at relatively high rates over relatively long distances includes at least two pairs of individually insulated conductors (42--42). The pairs of individually insulated conductors are enclosed in a tubular member (51) comprising a plastic material. A metallic shield (54) may or may not enclose the tubular member, and in a preferred embodiment, a plastic jacket (58) is provided. The twist length of each pair of insulated conductors does not exceed a value equal to the product of about forty and the outer diameter of the plastic insulation. Further, the twist lengths among the conductor pairs are varied in accordance with a twist frequency scheme modulated by non-uniform increments of twist frequency.
-
公开(公告)号：US4697051A
公开(公告)日：1987-09-29
申请号：US760867
申请日：1985-07-31
摘要： A parallel data transmission system (20) comprises a cable (40) which is capable of balanced mode transmission but which is driven in an unbalanced mode. The cable includes a plurality of twisted pairs of individually insulated conductors (42--42) enclosed by a metallic shield (54). The twist lengths are relatively short to cause the pairs to be decoupled sufficiently from one another to allow substantially error-free, parallel transmission over relatively long distances. Interposed between the core and the shield is a spacing member (52) which has a relatively low dielectric constant. Receiving facilities are provided for detecting whether the level of transmitted signals is above or below predetermined threshold values and for converting the received signals into one of two or more logic levels. Advantageously, this system increases substantially the distances over which substantially error-free transmission in an unbalanced mode can be accomplished.
摘要翻译： 并行数据传输系统（20）包括能够平衡模式传输但以不平衡模式驱动的电缆（40）。 电缆包括由金属屏蔽（54）包围的多个单独绝缘的导体（42-42）的双绞线。 扭转长度相对较短，导致成对彼此充分地分离，以允许在相对长的距离上实质上无差错的并行传输。 芯与屏蔽之间的间隔部件（52）具有较低的介电常数。 提供接收设备，用于检测发送信号的电平是否高于或低于预定阈值，并将接收的信号转换成两个或多个逻辑电平之一。 有利的是，该系统基本上增加了可以在不平衡模式下实现基本无差错传输的距离。
-
公开(公告)号：US4755629A
公开(公告)日：1988-07-05
申请号：US910848
申请日：1986-09-24
CPC分类号： H01B11/085 , H01B11/02
摘要： A cable (20) which is particularly suited to the transmission of substantially error-free data at relatively high rates over relatively long distances includes at least two pairs of individually insulated conductors (42--43). Each pair of individually insulated conductors is enclosed individually in its own tubular member (51) comprising a plastic material. A metallic shield (60) encloses the tubular members, and in a preferred embodiment, a plastic jacket (80) encloses the shield. In the preferred embodiment, two pairs of voice communications conductors are disposed at opposed locations between the shield and the jacket. The thickness of the tubular member is such that each insulated conductor of each twisted pair is caused to be spaced from the shield a distance which is not less than one half the diameter of the metallic wire portion of each pair enclosed by the tubular member.
摘要翻译： 特别适用于在相当长的距离上以相对高的速率传输基本上无差错的数据的电缆（20）包括至少两对独立绝缘的导体（42-43）。 每对单独绝缘的导体被单独封闭在其自己的包括塑料材料的管状构件（51）中。 金属屏蔽件（60）围绕管状构件，并且在优选实施例中，塑料护套（80）围绕屏蔽件。 在优选实施例中，两对语音通信导体设置在屏蔽和外壳之间的相对位置处。 管状构件的厚度使得每个双绞线的每个绝缘导体与屏蔽件隔开不少于由管状构件包围的每对的金属线部分的直径的一半的距离。
-
7.发明授权公开(公告)号：US06766022B1
公开(公告)日：2004-07-20
申请号：US09664243
申请日：2000-09-18
申请人： Steven C. Bartolutti , Leslie A. Baxter , Jane B. Clayton , Clay A. Feustel , Harold W. Friesen , David R. Hawkins , Christopher M. Helmstetter , Ian A. White
发明人： Steven C. Bartolutti , Leslie A. Baxter , Jane B. Clayton , Clay A. Feustel , Harold W. Friesen , David R. Hawkins , Christopher M. Helmstetter , Ian A. White
IPC分类号： H04M900
CPC分类号： H04Q1/14 , H04M7/0003 , H04M7/12 , H04M2201/60
摘要： A system for cross-connecting network elements of different types through a common universal media. In the system, a media conversion interface is electrically connected to a network element. This media conversion interface passively maps the connector and cable type of the network element to a universal connector type. This media conversion interface is electrically connected to a cross-connect module in a universal distribution frame. This electrical connection uses a universal cable group and universal connectors. This cross-connect module is connected to another cross-connect module, also in a universal distribution frame, using a universal cable group and universal connectors. This second cross-connect module is electrically connected to a second media conversion interface, using a universal cable group and universal connectors. This second media conversion interface is electrically connected to a second network element, and passively maps the connector and cable type of the second network element to the universal connector.
摘要翻译： 通过普通通用介质交换不同类型网络元件的系统。 在该系统中，媒体转换接口电连接到网络元件。 该媒体转换接口被动地将网络元件的连接器和电缆类型映射到通用连接器类型。 该媒体转换接口电连接到通用配线架中的交叉连接模块。 该电气连接使用通用电缆组和通用连接器。 该交叉连接模块使用通用电缆组和通用连接器连接到另一个交叉连接模块，也在通用配线架中。 该第二交叉连接模块使用通用电缆组和通用连接器电连接到第二介质转换接口。 该第二媒体转换接口电连接到第二网络元件，并且被动地将第二网络元件的连接器和电缆类型映射到通用连接器。
-
公开(公告)号：US5541361A
公开(公告)日：1996-07-30
申请号：US359682
申请日：1994-12-20
摘要： A cable for use within customer premises that effectively extends outside plant service to within the building. The cable has first and second core assemblies preferably formed of flame resistant material completely isolated from each other and surrounded by a shielding member having a rough FIG. 8 configuration. Each of the cores is completely enclosed within the loops formed by the shielding member and completely isolated from the other core. The shielding member is surrounded by a preferably flame resistant outer jacket.
摘要翻译： 在客户处所内使用的电缆，有效地将工厂外的服务延伸到建筑物内部。 电缆具有第一和第二芯组件，其优选地由彼此完全隔离并被具有粗略图的屏蔽构件包围的耐火材料形成。 8配置。 每个芯完全封闭在由屏蔽构件形成的环中并且与另一个芯完全隔离。 屏蔽构件由优选的耐火外套包围。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.022 秒)