CA2122420C - Category 5 telecommunication cable - Google Patents
Category 5 telecommunication cable Download PDFInfo
- Publication number
- CA2122420C CA2122420C CA002122420A CA2122420A CA2122420C CA 2122420 C CA2122420 C CA 2122420C CA 002122420 A CA002122420 A CA 002122420A CA 2122420 A CA2122420 A CA 2122420A CA 2122420 C CA2122420 C CA 2122420C
- Authority
- CA
- Canada
- Prior art keywords
- cable
- conductors
- twisted
- twisted pairs
- pairs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
- H01B7/0876—Flat or ribbon cables comprising twisted pairs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
- H01B7/0823—Parallel wires, incorporated in a flat insulating profile
Abstract
This invention is directed to a high performance electrical telecommunication transmission cable, particular7.y for undercarpet applications. More precisely, this invention is directed to a low-profile, high performance flat cable, where the cable may be subjected to potentially damaging compressive forces from walking on an overlying carpet. The cable comprises a plurality of conductors arranged as plural sets of twisted pairs, with each conductor consisting of an inner conductive core surrounded by insulation, an outer dielectric member having plural longitudinally extending chambers, where each chamber includes two sets of the twisted pairs, spaced-apart and arranged in side-by-side fashion and generally parallel. The height of the chamber is dimensioned to exceed the wrap diameter of a set of a twisted pair of conductors. Adjacent chambers include a dielectric vertically disposed wall therebetween to provide resistance to compressive forces, and the twisted pairs therewithin exhibit a preferred twist on the order of 1j2 to 1 inch lay length. For cable lengths of at least 1000 feet, the cable is characterized by an attenuation and NEXT loss which exceed the Category 5 requirements of EIA TSB-36.
Description
The present invention is directed to a high performance electrical telecommunication transmission cable, such as for undercarpet applications, where the cable is intended to meet or exceed the requirements for Category 5 cable, as hereinafter defined, while further offering structural integrity to the cabling system.
As a result of increased LAN speeds and improved connecting devices, an effort evolved to develop high performance unshielded twisted-pair (UTP) cable to meet the emerging requiremewts of the telecommunications industry. U.S. Patent No. 4,873,393 to Friesen et al. purports to meet the foregoing requirements with a cabling system suited for the transmission of substantially error-free data at relatively high rates over relatively long distances. According to the patent, this performance is achieved by the use of at least two pairs of individually insulated conductors, where the pairs of individually insulated conductors are enclosed in a tubular member comprising a plastic insulation material. The twist length of each pair of insulated conductors should 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. While purporting to meet the requirements of Category 5, the system thereof falls significantly short in providing structural integrity to the cable, whereby it may be used in undercarpet telecommunication ~~.~~f~i~~
As a result of increased LAN speeds and improved connecting devices, an effort evolved to develop high performance unshielded twisted-pair (UTP) cable to meet the emerging requiremewts of the telecommunications industry. U.S. Patent No. 4,873,393 to Friesen et al. purports to meet the foregoing requirements with a cabling system suited for the transmission of substantially error-free data at relatively high rates over relatively long distances. According to the patent, this performance is achieved by the use of at least two pairs of individually insulated conductors, where the pairs of individually insulated conductors are enclosed in a tubular member comprising a plastic insulation material. The twist length of each pair of insulated conductors should 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. While purporting to meet the requirements of Category 5, the system thereof falls significantly short in providing structural integrity to the cable, whereby it may be used in undercarpet telecommunication ~~.~~f~i~~
transmission systems without damaging the system and interfering with its performance.
U.S. Patent No. 4,777,325 to Siwinski discloses a low profile cable system for undercarpet applications, where such system appears to offer some limited structural integrity to the cable, but not the high performance requirements for present day transmission systems. The cable system as disclosed therein comprises a plurality of twisted pairs of conductors positioned side-by-side, each pair in separate compartments formed within a hollow envelope of an extruded outer sheath. Separator ribs, which do not extend across the entire height of the sheath, are provided to prevent lateral movement of twisted pairs out of their respective compartments. Laterally extending solid members may be included to withstand compressive loads.
The present invention, whose contributions will become apparent in the following description, particularly when read in conjunction with the accompanying drawings, combines high performance with structural integrity, especially for undercarpet applications.
Summary of the Invention This invention relates to a high performance electrical telecommunication transmission cable, such as for undercarpet applications. More precisely, this invention is directed to a low-profile, high performance flat cable, where the cable may be subjected to potentially damaging compressive forces. The cable comprises a plurality of conductors arranged as plural sets of i~ iJ
U.S. Patent No. 4,777,325 to Siwinski discloses a low profile cable system for undercarpet applications, where such system appears to offer some limited structural integrity to the cable, but not the high performance requirements for present day transmission systems. The cable system as disclosed therein comprises a plurality of twisted pairs of conductors positioned side-by-side, each pair in separate compartments formed within a hollow envelope of an extruded outer sheath. Separator ribs, which do not extend across the entire height of the sheath, are provided to prevent lateral movement of twisted pairs out of their respective compartments. Laterally extending solid members may be included to withstand compressive loads.
The present invention, whose contributions will become apparent in the following description, particularly when read in conjunction with the accompanying drawings, combines high performance with structural integrity, especially for undercarpet applications.
Summary of the Invention This invention relates to a high performance electrical telecommunication transmission cable, such as for undercarpet applications. More precisely, this invention is directed to a low-profile, high performance flat cable, where the cable may be subjected to potentially damaging compressive forces. The cable comprises a plurality of conductors arranged as plural sets of i~ iJ
twisted pairs, with each conductor consisting of an inner conductive core surrounded by insulation, an outer dielectric member having plural longitudinally extending chambers, where each chamber includes two sets of the twisted pairs, spaced-apart and arranged in side-by-side fashion and generally parallel. The height of the chamber is dimensioned to exceed the wrap diameter of a set of a twisted pair of conductors. Adjacent chambers include a dielectric vertically disposed wall therebetween to provide resistance to compressive forces, and the twisted pairs therewithin l0 exhibit a twist on the order of 1j2 to 1 inch lay length. For cable lengths of at least 1000 feet, the cable is characterized by an attenuation and NEXT loss which exceed the Category 5 requirements of EIA TSB-36.
Erief Description of Drawing's FIGURE 1 is a top perspective view of a low-profile, high performance cable according to the invention.
FIGURE 2 is an enlarged partial sectional view taken laterally through the cable of Figure 1.
FIGURE 3 is a sectional view taken along line 3-3 of Figure 2.
20 Detailed Description of Preferred Embodiment The present invention relates to a high performance transmission cable that meets or exceeds the performance requirements for Category 5 cable, as defined by the Electronic Industries Association (EIA) standard TSB-36 for Unshielded Twisted Pair Cable (UTP).
Erief Description of Drawing's FIGURE 1 is a top perspective view of a low-profile, high performance cable according to the invention.
FIGURE 2 is an enlarged partial sectional view taken laterally through the cable of Figure 1.
FIGURE 3 is a sectional view taken along line 3-3 of Figure 2.
20 Detailed Description of Preferred Embodiment The present invention relates to a high performance transmission cable that meets or exceeds the performance requirements for Category 5 cable, as defined by the Electronic Industries Association (EIA) standard TSB-36 for Unshielded Twisted Pair Cable (UTP).
Two important test criteria for UTP under Category 5 are attenuation and near end crosstalk (NEXT) loss, where attenuation is commonly derived from swept frequency signal measurement at the output of 1000 ft. of cable. The maximum attenuation for UTP of 24 AWG thermoplastic insulated conductors, for Category 5, in a given frequency range is listed in TABLE I, hereinafter. The second important test criteria is NEXT loss which is commonly derived from swept frequency measurement using a network analyzer or an s-parameter test set. That is, a balanced input signal is applied on a disturbing pair (excited) while the crosstalk signal is measured at the output port on a disturbed pair (monitored) at the near end of the cable. At the far end, the disturbed and disturbing pair are terminated in a 100 Ohm resistance. The minimum values, though such values are actually negative, for Category 5 are listed in TABLE II. An explanation of the test criteria, insofar as they relate to the present invention and the prior art, exemplified by U.S. Patent No. 4,777,325, will be covered later.
Turning now to the invention as illustrated in the accompanying Figures 1 to 3, the UTP cable 10 hereof, preferably four pairs of conductors and particularly intended for undercarpet applications, comprises a continuously extruded outer insulative jacket 12, formed of a dielectric material, such as polyvinyl chloride (PVC), containing preferably a pair of elongated chambers 14, where each chamber is intended to receive two pairs of twisted conductors 16. As a part of the extrusion process, a pair of laterally extending tapered members 18, 20, or wings, along with a broad internal rib 22, or section may be formed. These two laterally adjacent members 18 and 20 are joined to the edges of the centrally disposed insulative jacket 12 by a thin extruded section 24 and 26. Although each of the laterally adjacent members 18 and 20 are tapered toward their free ends, the maximum height of each solid member 18 and 20 adjacent the conductive sheath or jacket is substantially equal in height to the sheath 12. This arrangement, coupled with the central internal rib 22, provides improved resistance to compression, such as may be experienced from walking on an overlying carpet.
As best illustrated in Figure 2, the individual conductors, such as conductors 28 and 30 which form each of the conductors pairs 16, are positioned generally side-by-side within the outer sheath or jacket 12. Each individual conductor 28 and 30 has an inner conductor core surrounded by insulation, where a commercial conductor may be identified as 24 AWG. These insulated wires are then twisted in a conventional fashion along their length to form twisted pairs, where the twist is less than one inch, i.e., a 360°
rotation of the conductor in less than one inch of conductor length, preferably a twist of from 1/2 to 1 inch lay length. Two pairs of the twisted conductors 16 are arranged in a single chamber 14, where the wrap diameter "D", namely, twice the conductor diameter, is less than the height "H" of the chamber 14. That is, "H" is from 5 to 15% greater than the wrap diameter "D" to provide ample air space about the twisted conductors, see Figure 3. From a practical standpoint, the dimensioning therewithin is such that a 6~ r a N
given twisted pair of conductors 16 may be readily withdrawn from its chamber 14, such as by pulling.
From a closer inspection of Figure 2, which illustrates the relative position of the conductor pairs 16 within chamber 14, it will be seen that considerable air space is provided. It was discovered that this increased air space, plus the broad central rib 22 to space the chambers 14, dramatically improved the attenuation of the cable making it possible to achieve Category 5 in a low-profile undercarpet cable.
This improved performance can best be illustrated in the following data, where four unshielded twisted pairs of 24AWG
thermoplastic insulated conductors, enclosed by a thermoplastic jacket, were subjected to the Category 5 performance requirements for attenuation and crosstalk. For these tests, a first cable was prepared in accordance with the profile of Figure 2 (Invention), and a second cable in accordance with the profile of four individual twisted pairs, each within its separate chamber under U.S. Patent No. 4,777,325.
2~'~~~~%'~
_ 7 _ TABLE I
Attenuation Characteristics - dB Mau. per 1000 ft.
::::;:....:::>:<:.,...........~:::::......::w:;,:::~;.....;;:...,:....::...,.::
....:....::...,;..v,....:.:.:...:....:.....:
:::..;;,:..,..:.::,::. .. :::: ....:.:::... ;.::......_._... ;..:
. .. ; .:::.. :.',;.;.::.~;,..:.;.:
':..::::'.:.::..:.::.:....,.:::::::.~:..:.::
: ::.:::.:. ~:::~:::::.>.~::.::~:.:,: : ; ..:: .:,:.::::, -::. ; ::........:....:.....:. . ; ; . ,;:; :> . : :
.::.::::::.:.:.:::......... >.:: : : ::; .:
...; ...... .. ........:... . ;
::::::::.::...:.....~::::::::::.::.:::....~:::::::..~:::::.....................
.............
. . ' .~..1:'.,-::. ... .... .......................
::::.:::..:: t ..::...............................,.:.:~:::::::.::::.~::~:.:.:::
<.::::..:::....~...::....
:::.:.:.::~~ ........o.....;:....;;..:::..;:;:.
' ..........~'..l\~..,:'t:::
%.'-::~:: :: .:
,.::: ::~.."'~.
:~..:........
1.0 6.3 6.3 5.1 :.:~"_.~:
4 . 0 13 :~::. x:: 11. 5 8 . 0 18 :x;:'3;';:;5 16 . 6 10 . 0 2 0 18 . 6 16 . 0 2 5 ~ 2 3 . 7 20.0 28 ' 26.6 25.0 32 ~y 29.9 31.25 36 33.4 62.5 52 48.4 10 0 6 7 ~ 6 3 . 3 TABLE II
Near End Crosstalk Loss Characteristics - dB Min.
.....,.:.y;;:::;:':::;::;:::?:v:;::;:.,.:.;;,.:x;:;Y:i;S>::::..;..;'.::;.'.":., y;::::.9::,.,.-:y',;:4:_a"-::,.,.-5~;;.yvy:.::X4:':-'-;>?:b:i:!.:
~ , :
~ .: ~i~. >i;::i~'-': "':iY::<:, ,:: :;. ;
- ~~. :,.: ~ : :t::.: :vv~vy. :; : ; -.
_: ~~:: - ...:.. ~' ~-i: . ::..v'r,:i','; ~; _~:;
v:.::::::::.~ ~::: . :: : 'f : . ~. - , :' :. :. ::::: .: : ,.::.: .. :' . ... ... .. .: : :.; ~: . ~..... .~....~.......
. .. .>...~ :~::::.~~~~~~..i:::iRf:\4:::.:;w:::4::::::::
::.:::T:.,.:::::. . . .: :~:. ....\..:.\....,......::...\:.:
..v::i:i::>;:.':.,v:. .. .....................................
~- .,::;::q:::::.'.:1:::1::::.:.
.3 ~, ; . , _~,~- ,:;:::::.::v::::.:~:.~:.~.:~:.::::::
....: :. :4::;s:L:::4'4:Y~;
.~._:s~.~~.,~~s~~.....:._.v.
::: .~ .:''~. ::.
: ::.l.; :: '~:~::::' 1.0 62 74 71 4.0 53 71 63 8.0 48 62 62 10.0 47 60 61 16.0 44 59 57 20.0 42 58 54 25.0 41 58 53 31.25 40 55 44 62.5 35 47 45 E d wT
::..:.::..:.:.:::e:..:::.:;:..:e.::..,:.:..:,..;.:.;e:.::;........:.:r.:...:a:<
:...:.:::.;~.::::c.:o.:-.w.:.>......;.x;.>::.....:.:a:::.;.::::.::.::::::va::.:::.::
.. . : . . . .' ~.:.~ > ::::: :;;:;:F~;;:, ;. . ~.
, s, .. .:. ..~.,.::X:::<~.. ': ;: '. . '. . . . ;.;..
s ..: .. :- ~: .::a ' . ';::; ;: , . .. . .t:'t-:: ::v:.: ' a>s;...
. . ~ . ~. ; : ~ ' . ~-:v:
. .:::x-.si . ::::.~:::::::;:::.~.::::::::::
,: :::::::: .: : :..:: . :, ::: .: : :
:...: :.: . .; :.: :..,:.:: .: .,; ..:,-.,-.::.v...::::::
~ ::::: ~: .:. .; :.v..-: .:.::.-~.y;w:...v.:..nn.w.v.,................
.... :,.....:. .: :. >:: ::: ..v.>;::
... .......:...,. yy:. :.::: :...:::::::.::v:
\ : . ......v...,~, ,~y:;.:
;.;:.: _~. ::;' .:i~\'::
~:" ,: ~...........
;:~T '. :~:
From Table I, it will be seen that the prior art cable, made in accordance with the teachings of U.S. Patent No. 4,777,325, in the frequency range of from 4.0 to 100.0 MHz, failed to meet the attenuation performance requirements of Category 5 cable. In contrast, throughout the full frequency range of from 1.0 to 100.0 MHz, the cable of this invention exceeded the performance requirements for Category 5 cable. In all cases, the dB was below the maximum levels set out in the specification.
Table II tells a different story. Such Table shows that both cables satisfactorily met the NEXT performance requirements for Category 5 cable. As may be true in some situations, enhancement of one property or characteristic may often be accomplished with the attending loss or deterioration of a second property or characteristic. However, in the present case, it was possible to significantly improve attenuation without a serious loss in NEXT
performance. Thus, this invention has resulted in a low profile undercarpet cable that meets andjor exceeds the performance requirements for Category 5 cable.
Turning now to the invention as illustrated in the accompanying Figures 1 to 3, the UTP cable 10 hereof, preferably four pairs of conductors and particularly intended for undercarpet applications, comprises a continuously extruded outer insulative jacket 12, formed of a dielectric material, such as polyvinyl chloride (PVC), containing preferably a pair of elongated chambers 14, where each chamber is intended to receive two pairs of twisted conductors 16. As a part of the extrusion process, a pair of laterally extending tapered members 18, 20, or wings, along with a broad internal rib 22, or section may be formed. These two laterally adjacent members 18 and 20 are joined to the edges of the centrally disposed insulative jacket 12 by a thin extruded section 24 and 26. Although each of the laterally adjacent members 18 and 20 are tapered toward their free ends, the maximum height of each solid member 18 and 20 adjacent the conductive sheath or jacket is substantially equal in height to the sheath 12. This arrangement, coupled with the central internal rib 22, provides improved resistance to compression, such as may be experienced from walking on an overlying carpet.
As best illustrated in Figure 2, the individual conductors, such as conductors 28 and 30 which form each of the conductors pairs 16, are positioned generally side-by-side within the outer sheath or jacket 12. Each individual conductor 28 and 30 has an inner conductor core surrounded by insulation, where a commercial conductor may be identified as 24 AWG. These insulated wires are then twisted in a conventional fashion along their length to form twisted pairs, where the twist is less than one inch, i.e., a 360°
rotation of the conductor in less than one inch of conductor length, preferably a twist of from 1/2 to 1 inch lay length. Two pairs of the twisted conductors 16 are arranged in a single chamber 14, where the wrap diameter "D", namely, twice the conductor diameter, is less than the height "H" of the chamber 14. That is, "H" is from 5 to 15% greater than the wrap diameter "D" to provide ample air space about the twisted conductors, see Figure 3. From a practical standpoint, the dimensioning therewithin is such that a 6~ r a N
given twisted pair of conductors 16 may be readily withdrawn from its chamber 14, such as by pulling.
From a closer inspection of Figure 2, which illustrates the relative position of the conductor pairs 16 within chamber 14, it will be seen that considerable air space is provided. It was discovered that this increased air space, plus the broad central rib 22 to space the chambers 14, dramatically improved the attenuation of the cable making it possible to achieve Category 5 in a low-profile undercarpet cable.
This improved performance can best be illustrated in the following data, where four unshielded twisted pairs of 24AWG
thermoplastic insulated conductors, enclosed by a thermoplastic jacket, were subjected to the Category 5 performance requirements for attenuation and crosstalk. For these tests, a first cable was prepared in accordance with the profile of Figure 2 (Invention), and a second cable in accordance with the profile of four individual twisted pairs, each within its separate chamber under U.S. Patent No. 4,777,325.
2~'~~~~%'~
_ 7 _ TABLE I
Attenuation Characteristics - dB Mau. per 1000 ft.
::::;:....:::>:<:.,...........~:::::......::w:;,:::~;.....;;:...,:....::...,.::
....:....::...,;..v,....:.:.:...:....:.....:
:::..;;,:..,..:.::,::. .. :::: ....:.:::... ;.::......_._... ;..:
. .. ; .:::.. :.',;.;.::.~;,..:.;.:
':..::::'.:.::..:.::.:....,.:::::::.~:..:.::
: ::.:::.:. ~:::~:::::.>.~::.::~:.:,: : ; ..:: .:,:.::::, -::. ; ::........:....:.....:. . ; ; . ,;:; :> . : :
.::.::::::.:.:.:::......... >.:: : : ::; .:
...; ...... .. ........:... . ;
::::::::.::...:.....~::::::::::.::.:::....~:::::::..~:::::.....................
.............
. . ' .~..1:'.,-::. ... .... .......................
::::.:::..:: t ..::...............................,.:.:~:::::::.::::.~::~:.:.:::
<.::::..:::....~...::....
:::.:.:.::~~ ........o.....;:....;;..:::..;:;:.
' ..........~'..l\~..,:'t:::
%.'-::~:: :: .:
,.::: ::~.."'~.
:~..:........
1.0 6.3 6.3 5.1 :.:~"_.~:
4 . 0 13 :~::. x:: 11. 5 8 . 0 18 :x;:'3;';:;5 16 . 6 10 . 0 2 0 18 . 6 16 . 0 2 5 ~ 2 3 . 7 20.0 28 ' 26.6 25.0 32 ~y 29.9 31.25 36 33.4 62.5 52 48.4 10 0 6 7 ~ 6 3 . 3 TABLE II
Near End Crosstalk Loss Characteristics - dB Min.
.....,.:.y;;:::;:':::;::;:::?:v:;::;:.,.:.;;,.:x;:;Y:i;S>::::..;..;'.::;.'.":., y;::::.9::,.,.-:y',;:4:_a"-::,.,.-5~;;.yvy:.::X4:':-'-;>?:b:i:!.:
~ , :
~ .: ~i~. >i;::i~'-': "':iY::<:, ,:: :;. ;
- ~~. :,.: ~ : :t::.: :vv~vy. :; : ; -.
_: ~~:: - ...:.. ~' ~-i: . ::..v'r,:i','; ~; _~:;
v:.::::::::.~ ~::: . :: : 'f : . ~. - , :' :. :. ::::: .: : ,.::.: .. :' . ... ... .. .: : :.; ~: . ~..... .~....~.......
. .. .>...~ :~::::.~~~~~~..i:::iRf:\4:::.:;w:::4::::::::
::.:::T:.,.:::::. . . .: :~:. ....\..:.\....,......::...\:.:
..v::i:i::>;:.':.,v:. .. .....................................
~- .,::;::q:::::.'.:1:::1::::.:.
.3 ~, ; . , _~,~- ,:;:::::.::v::::.:~:.~:.~.:~:.::::::
....: :. :4::;s:L:::4'4:Y~;
.~._:s~.~~.,~~s~~.....:._.v.
::: .~ .:''~. ::.
: ::.l.; :: '~:~::::' 1.0 62 74 71 4.0 53 71 63 8.0 48 62 62 10.0 47 60 61 16.0 44 59 57 20.0 42 58 54 25.0 41 58 53 31.25 40 55 44 62.5 35 47 45 E d wT
::..:.::..:.:.:::e:..:::.:;:..:e.::..,:.:..:,..;.:.;e:.::;........:.:r.:...:a:<
:...:.:::.;~.::::c.:o.:-.w.:.>......;.x;.>::.....:.:a:::.;.::::.::.::::::va::.:::.::
.. . : . . . .' ~.:.~ > ::::: :;;:;:F~;;:, ;. . ~.
, s, .. .:. ..~.,.::X:::<~.. ': ;: '. . '. . . . ;.;..
s ..: .. :- ~: .::a ' . ';::; ;: , . .. . .t:'t-:: ::v:.: ' a>s;...
. . ~ . ~. ; : ~ ' . ~-:v:
. .:::x-.si . ::::.~:::::::;:::.~.::::::::::
,: :::::::: .: : :..:: . :, ::: .: : :
:...: :.: . .; :.: :..,:.:: .: .,; ..:,-.,-.::.v...::::::
~ ::::: ~: .:. .; :.v..-: .:.::.-~.y;w:...v.:..nn.w.v.,................
.... :,.....:. .: :. >:: ::: ..v.>;::
... .......:...,. yy:. :.::: :...:::::::.::v:
\ : . ......v...,~, ,~y:;.:
;.;:.: _~. ::;' .:i~\'::
~:" ,: ~...........
;:~T '. :~:
From Table I, it will be seen that the prior art cable, made in accordance with the teachings of U.S. Patent No. 4,777,325, in the frequency range of from 4.0 to 100.0 MHz, failed to meet the attenuation performance requirements of Category 5 cable. In contrast, throughout the full frequency range of from 1.0 to 100.0 MHz, the cable of this invention exceeded the performance requirements for Category 5 cable. In all cases, the dB was below the maximum levels set out in the specification.
Table II tells a different story. Such Table shows that both cables satisfactorily met the NEXT performance requirements for Category 5 cable. As may be true in some situations, enhancement of one property or characteristic may often be accomplished with the attending loss or deterioration of a second property or characteristic. However, in the present case, it was possible to significantly improve attenuation without a serious loss in NEXT
performance. Thus, this invention has resulted in a low profile undercarpet cable that meets andjor exceeds the performance requirements for Category 5 cable.
Claims (5)
1. A low-profile, high performance flat cable suitable for undercarpet applications, where said cable may be subjected to potentially damaging compressive forces, said cable comprising a plurality of conductors arranged as plural sets of twisted pairs, with each conductor consisting of an inner conductive core surrounded by insulation, an outer dielectric member having plural longitudinally extending chambers, where each said chamber includes two sets of said twisted pairs spaced-apart and arranged in side-by-side fashion and generally parallel, where the height of said chambers exceeds the wrap diameter of a set of a twisted pair of conductors, and where adjacent chambers include a dielectric vertically disposed wall therebetween to provide resistance to said compressive forces, and said twisted pairs exhibit a twist on the order of 1/2 to 1 inch lay length and said cable for lengths of at least 1000 feet is characterized by an attenuation and NEXT loss which exceed the Category 5 requirements of EIA TSB-36.
2. The cable according to claim 1, wherein said outer dielectric member is provided with a pair of tapered wing portions laterally extending therefrom.
3. The cable according to claim 1, wherein there are two said chambers with each containing two sets of twisted pairs of conductors.
4. The cable according to claim 1, wherein the wrap diameter of each said twisted pair of conductors is a predetermined dimension, and the height of said chamber is from 5 to 15% greater than said predetermined dimension.
5. The cable according to claim 1, wherein the width of said vertically disposed wall is sufficient to provide additional shielding between the internal pairs of twisted conductors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/082,340 US5399813A (en) | 1993-06-24 | 1993-06-24 | Category 5 telecommunication cable |
| US08/082,340 | 1993-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2122420A1 CA2122420A1 (en) | 1994-12-25 |
| CA2122420C true CA2122420C (en) | 2003-04-08 |
Family
ID=22170602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002122420A Expired - Fee Related CA2122420C (en) | 1993-06-24 | 1994-04-28 | Category 5 telecommunication cable |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5399813A (en) |
| CA (1) | CA2122420C (en) |
| IT (1) | IT1270136B (en) |
| TR (1) | TR28499A (en) |
Families Citing this family (43)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020091850A1 (en) * | 1992-10-23 | 2002-07-11 | Cybex Corporation | System and method for remote monitoring and operation of personal computers |
| FR2709860B1 (en) * | 1993-09-09 | 1995-10-20 | Filotex Sa | High frequency transmission cable. |
| US5576515A (en) * | 1995-02-03 | 1996-11-19 | Lucent Technologies Inc. | Fire resistant cable for use in local area networks |
| US5721842A (en) * | 1995-08-25 | 1998-02-24 | Apex Pc Solutions, Inc. | Interconnection system for viewing and controlling remotely connected computers with on-screen video overlay for controlling of the interconnection switch |
| JPH09240921A (en) * | 1996-03-12 | 1997-09-16 | Toshio Wakamatsu | Cable supporter |
| US6222130B1 (en) | 1996-04-09 | 2001-04-24 | Belden Wire & Cable Company | High performance data cable |
| US5814768A (en) * | 1996-06-03 | 1998-09-29 | Commscope, Inc. | Twisted pairs communications cable |
| US7154043B2 (en) | 1997-04-22 | 2006-12-26 | Belden Technologies, Inc. | Data cable with cross-twist cabled core profile |
| US6074503A (en) | 1997-04-22 | 2000-06-13 | Cable Design Technologies, Inc. | Making enhanced data cable with cross-twist cabled core profile |
| CA2289101C (en) * | 1997-05-02 | 2006-07-18 | David C. Racenet | Trocar seal system |
| EP1116086B1 (en) * | 1998-09-22 | 2007-02-21 | Avocent Huntsville Corporation | System for accessing personal computers remotely |
| US6248954B1 (en) * | 1999-02-25 | 2001-06-19 | Cable Design Technologies, Inc. | Multi-pair data cable with configurable core filling and pair separation |
| US6812408B2 (en) * | 1999-02-25 | 2004-11-02 | Cable Design Technologies, Inc. | Multi-pair data cable with configurable core filling and pair separation |
| US6162992A (en) * | 1999-03-23 | 2000-12-19 | Cable Design Technologies, Inc. | Shifted-plane core geometry cable |
| WO2000067353A1 (en) * | 1999-04-30 | 2000-11-09 | Exact Research, Inc. | Cord retractor and cable for high speed data transmission |
| US6153826A (en) * | 1999-05-28 | 2000-11-28 | Prestolite Wire Corporation | Optimizing lan cable performance |
| US7015397B2 (en) * | 2003-02-05 | 2006-03-21 | Belden Cdt Networking, Inc. | Multi-pair communication cable using different twist lay lengths and pair proximity control |
| US7244893B2 (en) * | 2003-06-11 | 2007-07-17 | Belden Technologies, Inc. | Cable including non-flammable micro-particles |
| US20040256139A1 (en) * | 2003-06-19 | 2004-12-23 | Clark William T. | Electrical cable comprising geometrically optimized conductors |
| EP1649610B1 (en) | 2003-07-11 | 2014-02-19 | Panduit Corp. | Alien crosstalk suppression with enhanced patch cord |
| WO2005013292A1 (en) * | 2003-07-28 | 2005-02-10 | Belden Cdt Networking, Inc. | Skew adjusted data cable |
| US7115815B2 (en) * | 2003-10-31 | 2006-10-03 | Adc Telecommunications, Inc. | Cable utilizing varying lay length mechanisms to minimize alien crosstalk |
| US7214884B2 (en) * | 2003-10-31 | 2007-05-08 | Adc Incorporated | Cable with offset filler |
| US7317163B2 (en) * | 2004-12-16 | 2008-01-08 | General Cable Technology Corp. | Reduced alien crosstalk electrical cable with filler element |
| US7157644B2 (en) * | 2004-12-16 | 2007-01-02 | General Cable Technology Corporation | Reduced alien crosstalk electrical cable with filler element |
| US7238885B2 (en) * | 2004-12-16 | 2007-07-03 | Panduit Corp. | Reduced alien crosstalk electrical cable with filler element |
| US7064277B1 (en) | 2004-12-16 | 2006-06-20 | General Cable Technology Corporation | Reduced alien crosstalk electrical cable |
| US7208683B2 (en) * | 2005-01-28 | 2007-04-24 | Belden Technologies, Inc. | Data cable for mechanically dynamic environments |
| US7375284B2 (en) * | 2006-06-21 | 2008-05-20 | Adc Telecommunications, Inc. | Multi-pair cable with varying lay length |
| GB2439756A (en) * | 2006-07-05 | 2008-01-09 | Linkranch Ltd | Electrical Cable |
| US7534963B1 (en) | 2008-01-10 | 2009-05-19 | Tyco Electronics Corporation | Low-profile cable |
| CA2749932C (en) * | 2009-01-30 | 2017-03-14 | General Cable Technologies Corporation | Separator for communication cable with geometric features |
| MX2011008431A (en) | 2009-02-11 | 2011-11-18 | Gen Cable Technologies Corp | Separator for communication cable with shaped ends. |
| US8490377B2 (en) | 2010-05-05 | 2013-07-23 | International Business Machines Corporation | High flex-life electrical cable assembly |
| US8431825B2 (en) | 2010-08-27 | 2013-04-30 | Belden Inc. | Flat type cable for high frequency applications |
| JP6075490B1 (en) | 2016-03-31 | 2017-02-08 | 株式会社オートネットワーク技術研究所 | Shield wire for communication |
| DE112016006665T5 (en) * | 2016-03-31 | 2018-12-20 | Autonetworks Technologies, Ltd. | communication cable |
| US10249410B1 (en) * | 2017-08-17 | 2019-04-02 | Superior Essex International LP | Power over ethernet twisted pair communication cables |
| US10867724B1 (en) | 2017-08-17 | 2020-12-15 | Superior Essex International LP | Method for forming power over ethernet twisted pair communication cables |
| US10974939B2 (en) * | 2017-11-09 | 2021-04-13 | Quanta Associates, L.P. | Inductor to control transient currents during energized bond on |
| USD934184S1 (en) * | 2017-12-26 | 2021-10-26 | Thomas Gamble | Floor cable cover for power and communications cables |
| US10276280B1 (en) | 2018-03-23 | 2019-04-30 | Superior Essex International LP | Power over ethernet twisted pair communications cables with a shield used as a return conductor |
| US11670922B2 (en) * | 2021-10-29 | 2023-06-06 | Mvvp Llc | Power and/or data connectivity track system |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3549788A (en) * | 1969-01-13 | 1970-12-22 | Bell Telephone Labor Inc | Flat-profile submarine coaxial cable with torque balance |
| US4012577A (en) * | 1975-04-30 | 1977-03-15 | Spectra-Strip Corporation | Multiple twisted pair multi-conductor laminated cable |
| DE2523653A1 (en) * | 1975-05-28 | 1976-12-09 | Licentia Gmbh | Multiple wire strip cable with low characteristic impedance - has twisted pairs and optional bare wire embedded in conductive plastics |
| EP0214276B1 (en) * | 1985-03-04 | 1989-08-02 | AMP INCORPORATED (a New Jersey corporation) | High performance flat cable |
| US4680423A (en) * | 1985-03-04 | 1987-07-14 | Amp Incorporated | High performance flat cable |
| US4755629A (en) * | 1985-09-27 | 1988-07-05 | At&T Technologies | Local area network cable |
| US4777325A (en) * | 1987-06-09 | 1988-10-11 | Amp Incorporated | Low profile cables for twisted pairs |
| US4873393A (en) * | 1988-03-21 | 1989-10-10 | American Telephone And Telegraph Company, At&T Bell Laboratories | Local area network cabling arrangement |
| FR2645358B1 (en) * | 1989-03-29 | 1991-05-24 | Filotex Sa | CABLE EASILY DETACHABLE WITH THE PLIERS BY TRANSVERSE ACTION, AND PLIERS FOR ITS DETRAINING |
| US5132488A (en) * | 1991-02-21 | 1992-07-21 | Northern Telecom Limited | Electrical telecommunications cable |
| US5162609A (en) * | 1991-07-31 | 1992-11-10 | At&T Bell Laboratories | Fire-resistant cable for transmitting high frequency signals |
-
1993
- 1993-06-24 US US08/082,340 patent/US5399813A/en not_active Expired - Lifetime
-
1994
- 1994-04-28 CA CA002122420A patent/CA2122420C/en not_active Expired - Fee Related
- 1994-05-25 IT ITMI941059A patent/IT1270136B/en active IP Right Grant
- 1994-06-24 TR TR00675/94A patent/TR28499A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TR28499A (en) | 1996-09-02 |
| IT1270136B (en) | 1997-04-29 |
| ITMI941059A0 (en) | 1994-05-25 |
| CA2122420A1 (en) | 1994-12-25 |
| US5399813A (en) | 1995-03-21 |
| ITMI941059A1 (en) | 1995-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2122420C (en) | Category 5 telecommunication cable | |
| CN1206665C (en) | Low delay skew multi-pair cable and mehtod of manufacture | |
| US6570095B2 (en) | Multi-pair data cable with configurable core filling and pair separation | |
| US5969295A (en) | Twisted pair communications cable | |
| US6153826A (en) | Optimizing lan cable performance | |
| CA2543341C (en) | Local area network cabling arrangement with randomized variation | |
| US7053310B2 (en) | Bundled cable using varying twist schemes between sub-cables | |
| JP4485130B2 (en) | Communication cable with insulated conductor | |
| CA2386896C (en) | A cable separator spline | |
| US20030106704A1 (en) | Electrical cable apparatus | |
| US20040035603A1 (en) | Multi-pair data cable with configurable core filling and pair separation | |
| US9418775B2 (en) | Separator tape for twisted pair in LAN cable | |
| WO1990000302A1 (en) | Round transmission line cable | |
| US20040118593A1 (en) | Flat tape cable separator | |
| AU2004222769A1 (en) | Cable having a filler | |
| US5049215A (en) | Method of forming a high impedance electrical cable | |
| JP2001143542A (en) | Multi pair cable | |
| KR100334888B1 (en) | Design for Cat.6 UTP Type Cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |