Telecommunications cable with offset separator
11990250 ยท 2024-05-21
Inventors
Cpc classification
H01B11/06
ELECTRICITY
International classification
Abstract
A telecommunications cable (100) has a jacket (110) and a separator (102). The separator (102) has a plurality of curved arms (104) and a plurality of primary arms (112a, 112b, 112c, 112d). Each end of the plurality of curved arms (104) is kept in contact with an inner surface of the jacket (110) to form a plurality of enclosed sections (114). The plurality of primary arms does not touch the inner surface of the jacket and is placed in an offset position relative to one another such that the plurality of primary arms is not aligned in line with one another creating an offset at a point of intersection. The plurality of primary arms has a plurality of equally distributed corrugations (116) projecting inwards towards the inner surface of the jacket (110).
Claims
1. A telecommunications cable (100), comprising: a jacket (110); and a separator (102), wherein the separator has a plurality of curved arms (104), wherein each of the plurality of curved arms (104) has ends in contact with an inner surface of the jacket (110) that forms a plurality of enclosed sections (114) between the plurality of curved arms (104) and the inner surface of the jacket (110).
2. The telecommunications cable (100) as claimed in claim 1, wherein the plurality of enclosed sections (114) between the plurality of curved arms (104) and the inner surface of the jacket (110) has an equal area.
3. The telecommunications cable (100) as claimed in claim 1, wherein each of the plurality of curved arms (104) has a length less than a circumference of the telecommunications cable (100).
4. The telecommunications cable (100) as claimed in claim 1, wherein the separator has a plurality of primary arms (112a, 112b, 112c, 112d) that does not touch the inner surface of the jacket.
5. The telecommunications cable (100) as claimed in claim 1, wherein the separator (102) further comprising the plurality of primary arms such that at least one primary arm of the plurality of primary arms is in contact with the plurality of curved arms (104) forming the plurality of sections (106) in the telecommunications cable.
6. The telecommunications cable (100) of claim 1, wherein the separator (102) further comprising the plurality of primary arms that is placed in an offset position relative to one another such that the plurality of primary arms is not aligned in line with one another creating an offset at a point of intersection.
7. The telecommunications cable (100) of claim 1, wherein the separator (102) comprising the plurality of primary arms that is placed in the offset position relative to one another such that a cross adjacent twisted pairs of insulated conductors (108) are separated with at least a distance twice a thickness of the plurality of primary arms.
8. The telecommunications cable (100) as claimed in claim 1, wherein the separator (102) further comprising the plurality of primary arms having a plurality of equally distributed corrugations (116) projecting towards the inner surface of the jacket (110).
9. The telecommunications cable (100) as claimed in claim 1, wherein the separator (102) further comprising the plurality of primary arms having the plurality of equally distributed corrugations (116) projecting towards the inner surface of the jacket (110) such that each of the corrugations may have a triangular shape, a square shape, a rectangular shape, or a parabolic shape.
Description
BRIEF DESCRIPTION OF THE FIGURES
(1) Having thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
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(7) It should be noted that the accompanying figures are intended to present illustrations of exemplary embodiments of the present disclosure. These figures are not intended to limit the scope of the present disclosure. It should also be noted that accompanying figures are not necessarily drawn to scale.
DETAILED DESCRIPTION OF INVENTION
(8) In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present technology. It will be apparent, however, to one skilled in the art that the present technology can be practiced without these specific details. In other instances, structures and devices are shown in block diagram form only in order to avoid obscuring the present technology.
(9) Reference in this specification to one embodiment or an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present technology. The appearance of the phrase in one embodiment in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Moreover, various features are described which may be exhibited by some embodiments and not by others. Similarly, various requirements are described which may be requirements for some embodiments but no other embodiments.
(10) Reference will now be made in detail to selected embodiments of the present disclosure in conjunction with accompanying figures. The embodiments described herein are not intended to limit the scope of the disclosure, and the present disclosure should not be construed as limited to the embodiments described. This disclosure may be embodied in different forms without departing from the scope and spirit of the disclosure. It should be understood that the accompanying figures are intended and provided to illustrate embodiments of the disclosure described below and are not necessarily drawn to scale. In the drawings, like numbers refer to like elements throughout, and thicknesses and dimensions of some components may be exaggerated for providing better clarity and ease of understanding.
(11) Moreover, although the following description contains many specifics for the purposes of illustration, anyone skilled in the art will appreciate that many variations and/or alterations to said details are within the scope of the present technology. Similarly, although many of the features of the present technology are described in terms of each other, or in conjunction with each other, one skilled in the art will appreciate that many of these features can be provided independently of other features. Accordingly, this description of the present technology is set forth without any loss of generality to, and without imposing limitations upon, the present technology.
(12) It should be noted that the terms first, second, and the like, herein do not denote any order, ranking, quantity, or importance, but rather are used to distinguish one element from another. Further, the terms a and an herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
(13) Generally, the telecommunications cable is a type of guided transmission media that allows baseband transmissions from a transmitter to a receiver. The telecommunications cable is utilized for mass data transmission of a local area network. Further, the telecommunications cable is used for high-speed data rate transmission. The high-speed data rate transmission includes 1000BASE-T (Gigabit Ethernet) and 10 GBASE-T (10-Gigabit Ethernet) or other standards. The telecommunications cable is used for a wide variety of applications. For example, the telecommunications cable may be a twisted pair telecommunications cable. Specifically, the telecommunications cable may be an unshielded twisted pair telecommunications cable. The unshielded twisted pair telecommunications cable is a cable with two conductors twisted together. The conductors are twisted together to cancel out electromagnetic interference from internal and external sources.
(14) Accordingly, the present disclosure provides an offset separator for use in a telecommunications cable. The key idea of the present disclosure is to place the offset separator in the telecommunications cable to make the telecommunications cable compliant with stringent near-end crosstalk testing. The key idea is to restrict movement of a plurality of twisted pairs of insulated conductors inside a plurality of sections to provide firm packing of bunched twisted pairs inside the telecommunications cable. Further, the key idea is to support alignment of the offset separator with the plurality of twisted pairs of insulated conductors against an outer jacket. Furthermore, the key idea is to manufacture the offset separator with low density polymeric material.
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(16) The plurality of twisted pairs of insulated conductors (108) is used for transferring data and electrical signal. Each insulated conductor of the plurality of twisted pairs of insulated conductors (108) includes an electrical conductor (108a) and an insulation layer (108b). Each electrical conductor (108a) extends substantially along the longitudinal axis of the telecommunications cable (100) and twisted along its length. Each of the plurality of twisted pairs of insulated conductors (108) is helically twisted along its length. The plurality of twisted pairs of insulated conductors (108) is helically twisted together to minimize the cross talk in the cable (100). In case of four twisted pairs of insulated conductors (108), each of the four twisted pairs of insulated conductors includes two insulated conductors twisted together along a length of the insulated conductors.
(17) Further, each twisted pair of insulated conductor of the plurality of twisted pairs of insulated conductors (108) includes a first electrical conductor and a second electrical conductor. The first electrical conductor is surrounded by a first insulation layer and the second electrical conductor is surrounded by a second insulated layer. Similarly, each of the four twisted pair conductors of the plurality of twisted pairs of insulated conductors (108) includes a third electrical conductor surrounded by a third insulation layer and a fourth electrical conductor surrounded by a fourth insulated layer. Each electrical conductor is 23 American wire gauge (hereinafter AWG) conductor that act as data transmission element of the telecommunications cable (100). Each electrical conductor may be of any suitable AWG size. The AWG is a standardized wire gauge system. The value of wire gauge indicates the diameter of the conductors in the cable. Each electrical conductor (108a) may be of circular shape. Each electrical conductor (108a) may be of other suitable shapes.
(18) The electrical conductor (108a) of the plurality of twisted pairs of insulated conductors (108) is generally made of copper. Alternatively, the electrical conductor (108a) may be made of any other suitable conductor material.
(19) Each electrical conductor (108a) is enclosed by the insulation layer (108b) and thus forms a twisted pair of insulated conductor (108). The insulation layer (108b) is made of special materials (referred to as insulators or a protective coating layer) for providing insulation from the neighbouring electrical conductors. The insulation layer (108b) provides electrical isolation for each electrical conductor (108a). The insulation material may have properties like high mechanical strength and high electrical resistance. The insulation material may be, but not limited to, polyolefin, fluoropolymer, foamed polyolefin, foamed fluoropolymer or combination thereof.
(20) In an aspect, the insulation layer (108b) enclosing the electrical conductors may be coloured. Each insulation layer (108b) may have same or different colours and may be, but not limited to blue, green, orange, brown. Alternatively, the insulation layer (108b) may be transparent. The plurality of twisted pairs of insulated conductors (108) may be of any suitable diameter.
(21) The separator (102) has at least one primary arm from the plurality of primary arms corrugated (as shown in
(22) The separator (102) may have the plurality of curved arms (104) (as shown in
(23) The separator (102) may align with a centre of the cable (100). Alternatively, the separator (102) may not align with the centre of the cable (100). The separator (102) enables the cross adjacent twisted pairs of insulated conductors (108) of the cable (100) to be separated with a distance of at least twice the thickness of the plurality of primary arms. The separator (102) having the plurality of curved arms (104) enables the twisted pairs of insulated conductors (108) (especially the cross adjacent twisted pairs) to be placed far enough as compared to conventional separator resulting into higher margin of cross talk parameters.
(24) The plurality of curved arms (104) has a length less than the circumference of the cable (100). The plurality of curved arms (104) has a curvature (0) of 1.5 to 5.5 degrees with the inner surface of the jacket. The plurality of curved arms needs to have a curvature of at least 1.5 degrees as the curvature below this value will make the arms straight and will create problem in placing the twisted pairs of insulated conductors (108) in the plurality of sections (106) while the curvature of more than 5.5 degrees results in enlarged enclosed sections (114) and thus will increase the diameter of the telecommunications cable. In an example, the plurality of primary arms (112a, 112b, 112c, 112d) may have an arm length in a range of 1.5 mm to 2.8 mm. The plurality of primary arms needs to have a length of 1.5 mm, less than this will not provide enough separation between the twisted pairs of insulated conductors (108) resulting in worse near-end cross-talk performance while the length more than 2.8 will require more material and make the telecommunications cable costly and bulky. The plurality of curved arms (104) may have an arm length of 4 mm to 5.8 mm. The plurality of curved arm needs to have a length of 4 mm as less than this will not be consistent with the separator design while the length more than 5.8 mm will require more material and make the telecommunications cable costly and bulky. The plurality of primary arms and plurality of curved arms may have a thickness of 0.2 mm-0.6 mm. The thickness of the plurality of primary arms and the plurality of curved arms needs to be 0.2 mm as less than this results into a separator with poor mechanical strength and cause collapsing of separator during manufacturing while thickness more than 0.6 mm will require more material, thereby making the telecommunications cable costly and bulky.
(25) The plurality of twisted pairs of insulated conductors (108) extends substantially along the longitudinal axis of the cable (100) and may be placed in any manner in the plurality of sections (106) of the cable (100).
(26) The separator (102) physically separates/isolates each of the plurality of twisted pairs of insulated conductors (108) from each other within the cable (100). The separator (102) extends along the length of the cable and separate the core of the cable into the plurality of sections (106). In an aspect, the plurality of sections may be two, three or four. In case of four sections (as shown in
(27) The separator (102) made of a Medium Density Poly Ethylene (MDPE) material. Alternatively, the separator (102) made of a material selected from a group of low density polyethylene (LDPE), low smoke zero halogen, foamed polyethylene, polyethylene, polyvinyl chloride, polypropylene, foamed polypropylene or combination thereof.
(28) Advantageously, the separator with the curved arms facilitates easy placement of the plurality of twisted pairs of insulated conductors within the plurality of sections. It also creates air gap inside the plurality of sections that improves insertion loss and propagation delay and PSAACRF (Power Sum Alien Attenuation To Crosstalk Ratio Far-End) parameters as disclosed above. To explain this further, referring to
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(30) Thus, the extra spacing in all sections (106) is equal to 4?0.1749 mm.sup.2 i.e. 0.6996 mm.sup.2. So, each section will have approximately 0.1749 mm.sup.2 extra space, when compared with 4 U separator. Hence, the entire cable will have approximately 4?0.1749=0.69 mm.sup.2 air space when made with separator (102). This extra spacing will enable easy placement of the plurality of twisted pairs of insulated conductors (108) within the sections of the separator and improves insertion loss and propagation delay and PSAACRF (Power Sum Alien Attenuation To Crosstalk Ratio Far-End) parameters.
(31) Further, due to formation of the plurality sections, each of the plurality of twisted pairs of insulated conductors (108) can be placed easily without any efforts. On the other hand, in combined sections (106a) (as shown in
(32) Due to unique separator design, more specifically separator with the curved arms, the separator can be made efficiently using any grade of polymeric material as mentioned above.
(33) The plurality of primary arms is placed in such a manner that at least one primary arm of the plurality of primary arms is in contact with the plurality of curved arms (104) forming the plurality of sections (106) in the cable. Further, the plurality of primary arms is placed in an offset position relative to one another such that the plurality of primary arms is not aligned in line with one another creating an offset at a point of intersection. Further, due to offset placement of the plurality of primary arms (112a, 112b, 112c, 112d), the plurality of twisted pairs of insulated conductors (108) especially the cross adjacent pairs are placed far enough that provides higher margin of cross talk parameters. For example, referring to
(34) Similarly, in case of the separator (102), as shown in
(35) The separator placed along with the plurality of twisted pairs of insulated conductors (108) is enclosed by the jacket (110). The separator (102) forms the plurality of sections (106) making it closely aligned with the plurality of twisted pairs of insulated conductors (108) as each pair can be placed easily within the plurality of sections during manufacturing. Further, the separator is properly aligned with the plurality of twisted pairs of insulated conductors (108) against the jacket (110). Due to the plurality of enclosed sections (114) formed by the plurality of curved arms with inner surface of the jacket, the separator (102) remains intact during bunching with the core and thus easily gets round shape during sheathing/jacketing with less scrap. Also, the plurality of enclosed sections (114) provides enough separation to compensate the effect of alien cross talk from neighbouring telecommunications cables. Furthermore, due to unique design of the separator, the separator can be made with smaller dimension with low density materials with ease.
(36) The jacket (110) provides insulation from neighbouring cables and mechanical stability to the cable (100). The jacket (110) may be made of low smoke zero halogen, foamed polyethylene, polyethylene, polyvinyl chloride, polypropylene, foamed polypropylene, polymeric material or the like.
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(38) The telecommunications cable (100) may have any suitable value of diameter. The telecommunications cable (100) have compact design. Due to compact design and reduced telecommunications cable diameter, more telecommunications cable can be placed within a conduit during installation. The telecommunications cable (100) are compatible with existing connector specification.
(39) The aforementioned structural elements enable an improvement in a plurality of characteristics of the telecommunications cable (100). The plurality of characteristics includes electrical properties and transmission characteristics. The electrical properties include input impedance, conductor resistance, mutual capacitance, resistance unbalance, capacitance unbalance, propagation delay and delay skew. The transmission characteristics include attenuation, return loss, near end crosstalk, attenuation to crosstalk ratio far end, alien cross talk, power sum attenuation to crosstalk ratio at far end, Transverse conversion loss and power sum alien near end cross talk.
(40) The telecommunications cable (100) is designed to reduce attenuation and crosstalk. Attenuation may be defined as reduction in strength of a signal travelling through the telecommunications cables (100). The crosstalk may be the near end cross talk, alien cross talk or the like. The near end crosstalk is an error condition describing the occurrence of a signal from one wire pair radiating to and interfering with the signal of another wire pair. Similarly, the alien crosstalk is electromagnetic noise occurring in a telecommunications cables (100) running alongside one or more other signal-carrying cables. The term alien is used as alien crosstalk occurs between different cables in a group or bundle and not between individual wires or circuits within a single cable.
(41) The telecommunications cables (100) adheres to the standards ANSI/TIA 568.2-D and ISOI/IEC 11801.
(42) The present invention provides various advantages over the prior art. The telecommunications cables (100), with specially designed offset separator or (filler), provides protection against alien cross talk from surrounding cables at all frequency range because of the plurality of curved arms. Due to the plurality of curved arms, the separator doesn't buckle during bunching. Further, the separator restricts movement of the plurality of twisted pairs of insulated conductors (108) inside the plurality of sections and provides firm packing of bunched pairs (i.e. the plurality of twisted pairs of insulated conductors (108)) inside the telecommunications cable (100)). The separator is aligned with the plurality of twisted pairs of insulated conductors (108) against the jacket (110).
(43) The foregoing descriptions of pre-defined embodiments of the present technology have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present technology to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present technology and its practical application, to thereby enable others skilled in the art to best utilize the present technology and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present technology.