GB2059669A - Improvement in or relating to telecommunication cables - Google Patents

Improvement in or relating to telecommunication cables Download PDF

Info

Publication number
GB2059669A
GB2059669A GB8030354A GB8030354A GB2059669A GB 2059669 A GB2059669 A GB 2059669A GB 8030354 A GB8030354 A GB 8030354A GB 8030354 A GB8030354 A GB 8030354A GB 2059669 A GB2059669 A GB 2059669A
Authority
GB
United Kingdom
Prior art keywords
pair
video
pairs
audio
polythene
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.)
Granted
Application number
GB8030354A
Other versions
GB2059669B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Balfour Beatty PLC
Original Assignee
BICC PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BICC PLC filed Critical BICC PLC
Priority to GB8030354A priority Critical patent/GB2059669B/en
Publication of GB2059669A publication Critical patent/GB2059669A/en
Application granted granted Critical
Publication of GB2059669B publication Critical patent/GB2059669B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A telecommunication cable comprising a plurality of twisted together video pairs 23 in which the twisted pairs are laid helically around a central core 21 of semiconducting material, for example semiconducting plastics material. Additionally an audio pair 24 may be associated with a video pair, each audio conductor lying in a respective one of the two grooves joined by the juxtaposition of the components of the video pairs. <IMAGE>

Description

SPECIFICATION Improvements in or relating to telecommunication cables This invention relates to telecommunication cables and in particular to cables of the kind comprising a plurality of twisted together video pairs.
By the expression "video pair" is meant a pair of separately insulated conductors suitable for use at a frequency lying within the range 1 to 10 megahertz.
It is an object of the present invention to provide a telecommunication cable which has improved cross-view characteristics between opposite video pairs within the cable.
In accordance with the invention, a telecommunication cable comprises a plurality of twisted together video pairs wherein the twisted pairs are laid helically around a central core of semiconducting material, preferably semiconducting plastics material.
The invention is especially, but not exclusively, applicable to the telecommunication cable described and claimed in the Complete Specification of our UK Patent No. 1105930 and comprising a plurality of audio pairs and a plurality of video pairs, each audio pair being associated with a video pair to form a "pod", the audio pair of each "pod" having the same length of pair twist as that of the video pair which which it is associated and having one of its conductors lying in one of the two interstitial grooves formed by the conductors of the video pair and the other of its conductors lying in the other of the two grooves.
This invention is also applicable to the telecommunication cable in which at least one video pair does not have an audio pair associated with it but has one or each of its interstitial spaces present within the circumscribing cylinder of the pair occupied by an elongate member wholly of electrically insulating material, which elongate members serve to prevent displacement of one pair with respect to an adjacent pair.
As described and claimed in the Complete Specification of our UK Patent No. 1322752, each elongate member of insulating material occupying an interstitial space of a video pair may be integral with or secured to one of the insulated conductors of the pair with which the member is associated or may be integral with or secured to the elongate member, when present, occupying the other interstitial space of the pair.
The expression "audio pair" is intended to mean a pair of separately insulated conductors which is not suitable for use as a video pair as hereinbefore defined but which is normally suitable only for use at a frequency within the audio frequency range.
The central core of the cable is preferably either of solid cross-section or of tubular cross-section. Preferably a screening layer is provided around the twisted pairs, the screening layer preferably being of semiconducting polythene, or of copper tape, or of polythene coated aluminium tape.
Preferably the conductors of the pairs are of copper.
The invention is further illustrated by a description, by way of example, of two forms of telecommunication cables with reference to the accompanying drawings, in which: Figure 1 is a cross-sectional view of one form of telecommunication cable; and Figure 2 is a cross-sectional view of an alternative form of telecommunication cable.
The telecommunication cable shown in Fig.
1 comprises six sets of mixed pairs or "pods" 2, laid up helically around a central tube 1 of semiconducting polythene, each set comprising one video pair and one audio pair. Each core 3 of each video pair comprises a copper conductor 4 and a polythene insulating covering 5. Each core 6 of each audio pair comprises a copper conductor 7 and a covering 8 of polythene insulation. The four cores of each "pod" are laid up together with a right hand lay, one audio core 6 lying in one of the two interstitial grooves betwen the video cores 3 and the other audio core lying in the other interstitial groove.The length of lay of the cores of each "pod" is different from that of the cores of each of the remaining five "pods". The six "pods" 2 are laid up around the semiconducting polythene central tube 1 and the assembly is lapped with tape 9 of polyester film and is provided with a seamless covering 10 of polythene. The polythene covered assembly of mixed pairs is provided with a screen of longitudinally applied polythene coated aluminium tape 11 and is enclosed in a seamless sheath 1 2 of a black polythene.
The telecommunication cable shown in Fig.
2 comprises a central core 21 of solid semiconducting polythene around which are laid up helically four sets of "pods" 22, each set comprising one video pair 23 and one audio pair 24, and two video pairs 25 without associated audio pairs. The assembly is lapped with a tape 26 of polyester film and is provided with a seamless covering 27 of polythene. The polythene covered assembly of each cable has a screen 28 comprising a helically lapped copper tape and is enclosed in a seamless sheath 29 of polythene. The interstitial spaces of each video pair 25 of insulated conductors are occupied by solid elongate polythene members 30, one member being integral with the insulation of one insulated conductor of the pair 25, and the other member being integral with the other insulated conductor of the pair 25.
1. A telecommunication cable comprising
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (14)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to telecommunication cables This invention relates to telecommunication cables and in particular to cables of the kind comprising a plurality of twisted together video pairs. By the expression "video pair" is meant a pair of separately insulated conductors suitable for use at a frequency lying within the range 1 to 10 megahertz. It is an object of the present invention to provide a telecommunication cable which has improved cross-view characteristics between opposite video pairs within the cable. In accordance with the invention, a telecommunication cable comprises a plurality of twisted together video pairs wherein the twisted pairs are laid helically around a central core of semiconducting material, preferably semiconducting plastics material. The invention is especially, but not exclusively, applicable to the telecommunication cable described and claimed in the Complete Specification of our UK Patent No. 1105930 and comprising a plurality of audio pairs and a plurality of video pairs, each audio pair being associated with a video pair to form a "pod", the audio pair of each "pod" having the same length of pair twist as that of the video pair which which it is associated and having one of its conductors lying in one of the two interstitial grooves formed by the conductors of the video pair and the other of its conductors lying in the other of the two grooves. This invention is also applicable to the telecommunication cable in which at least one video pair does not have an audio pair associated with it but has one or each of its interstitial spaces present within the circumscribing cylinder of the pair occupied by an elongate member wholly of electrically insulating material, which elongate members serve to prevent displacement of one pair with respect to an adjacent pair. As described and claimed in the Complete Specification of our UK Patent No. 1322752, each elongate member of insulating material occupying an interstitial space of a video pair may be integral with or secured to one of the insulated conductors of the pair with which the member is associated or may be integral with or secured to the elongate member, when present, occupying the other interstitial space of the pair. The expression "audio pair" is intended to mean a pair of separately insulated conductors which is not suitable for use as a video pair as hereinbefore defined but which is normally suitable only for use at a frequency within the audio frequency range. The central core of the cable is preferably either of solid cross-section or of tubular cross-section. Preferably a screening layer is provided around the twisted pairs, the screening layer preferably being of semiconducting polythene, or of copper tape, or of polythene coated aluminium tape. Preferably the conductors of the pairs are of copper. The invention is further illustrated by a description, by way of example, of two forms of telecommunication cables with reference to the accompanying drawings, in which: Figure 1 is a cross-sectional view of one form of telecommunication cable; and Figure 2 is a cross-sectional view of an alternative form of telecommunication cable. The telecommunication cable shown in Fig. 1 comprises six sets of mixed pairs or "pods" 2, laid up helically around a central tube 1 of semiconducting polythene, each set comprising one video pair and one audio pair. Each core 3 of each video pair comprises a copper conductor 4 and a polythene insulating covering 5. Each core 6 of each audio pair comprises a copper conductor 7 and a covering 8 of polythene insulation. The four cores of each "pod" are laid up together with a right hand lay, one audio core 6 lying in one of the two interstitial grooves betwen the video cores 3 and the other audio core lying in the other interstitial groove.The length of lay of the cores of each "pod" is different from that of the cores of each of the remaining five "pods". The six "pods" 2 are laid up around the semiconducting polythene central tube 1 and the assembly is lapped with tape 9 of polyester film and is provided with a seamless covering 10 of polythene. The polythene covered assembly of mixed pairs is provided with a screen of longitudinally applied polythene coated aluminium tape 11 and is enclosed in a seamless sheath 1 2 of a black polythene. The telecommunication cable shown in Fig. 2 comprises a central core 21 of solid semiconducting polythene around which are laid up helically four sets of "pods" 22, each set comprising one video pair 23 and one audio pair 24, and two video pairs 25 without associated audio pairs. The assembly is lapped with a tape 26 of polyester film and is provided with a seamless covering 27 of polythene. The polythene covered assembly of each cable has a screen 28 comprising a helically lapped copper tape and is enclosed in a seamless sheath 29 of polythene. The interstitial spaces of each video pair 25 of insulated conductors are occupied by solid elongate polythene members 30, one member being integral with the insulation of one insulated conductor of the pair 25, and the other member being integral with the other insulated conductor of the pair 25. CLAIMS
1. A telecommunication cable comprising a plurality of twisted together video pairs wherein the twisted pairs are laid up helically around a central core of semiconducting mate rial.
2. A telecommunication cable comprising a plurality of audio pairs and a plurality of video pairs, wherein each audio pair is associated with a video pair to form a "pod", the audio pair of each "pod" having the same length of pair twist as that of the video pair with which it is associated and having one of its conductors lying in one of the two interstitial grooves formed by the conductors of the video pair and the other of its conductors lying in the other of the two grooves, and wherein the "pods" so formed are laid up helically around a central core of semiconducting material.
3. A telecommunication cable comprising a plurality of audio pairs and a plurality of video pairs in which each audio pair is associated with a video pair to form a "pod", the audio pair of each "pod" having the same length of pair twist as that of the video pair with which it is associated and having one of its conductors lying in one of two interstitial spaces formed by the conductors of the video pair and the other of its conductors lying in the other of the two spaces, wherein at least one video pair does not have an audio pair associated with it but has one or each of its interstitial spaces present within the circumscribing cylinder of the pair occupied by an elongate member wholly of electrically insulating material which serves to prevent displacement of the pair with respect to an adjacent pair and wherein the "pods" and the or each twisted video pair are laid up helically around a central core of semiconducting material.
4. A telecommunication cable as claimed in Claim 3 wherein each elongate member of insulating material occupying an interstitial space of a video pair is integral with or secured to one of the insulated conductors of the video pair with which it is associated or is integral with or secured to the elongate member, when present, occupying the other interstitial space of the video pair.
5. A telecommunication cable as claimed in any one of the preceding Claims, wherein the material of the central core is semiconducting plastics material.
6. A telecommunication cable as claimed in any one of the preceding Claims, wherein the central core is of solid cross-section.
7. A telecommunication cable as claimed in any one of Claims 1 to 5, wherein the central core is of tubular cross-section.
8. A telecommunication cable as claimed in any one of the preceding Claims, wherein a screening layer is provided around the twisted video pairs.
9. A telecommunication cable as claimed in Claim 8, wherein the screening layer is of semiconducting polythene.
1 0. A telecommunication cable as claimed in Claim 8, wherein the screening layer is copper tape.
11. A telecommunication cable as claimed in Claim 8, wherein the screening layer is polythene coated aluminium tape.
1 2. A telecommunication cable as claimed in any one of the preceding Claims, wherein the conductors of the pairs are of copper.
1 3. A telecommunication cable as hereinbefore described with reference to and as shown in Fig. 1 of the accompanying drawings.
14. A telecommunication cable as hereinbefore described with reference to and as shown in Fig. 2 of the accompanying drawings.
GB8030354A 1979-09-21 1980-09-19 Telecommunication cables Expired GB2059669B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8030354A GB2059669B (en) 1979-09-21 1980-09-19 Telecommunication cables

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7932748 1979-09-21
GB8030354A GB2059669B (en) 1979-09-21 1980-09-19 Telecommunication cables

Publications (2)

Publication Number Publication Date
GB2059669A true GB2059669A (en) 1981-04-23
GB2059669B GB2059669B (en) 1983-03-30

Family

ID=26272964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8030354A Expired GB2059669B (en) 1979-09-21 1980-09-19 Telecommunication cables

Country Status (1)

Country Link
GB (1) GB2059669B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098233A2 (en) * 1982-06-29 1984-01-11 Siemens Aktiengesellschaft Quad stranding unit for a longitudinally water-tight telecommunication cable
US4973794A (en) * 1987-07-31 1990-11-27 General Electric Company Cable assembly for an electrical signal transmission system
GB2208561B (en) * 1987-07-31 1991-11-06 Gen Electric Cable assembly for an electrical signal transmission system
DE4307807A1 (en) * 1993-03-12 1994-09-15 Rheydt Kabelwerk Ag Electrical data transmission element
WO1995004360A1 (en) * 1993-07-30 1995-02-09 Ardnaboha Trading Limited A cable assembly
WO2003005379A1 (en) * 2001-07-06 2003-01-16 The Ludlow Company Lp Cable having annularly arranged set of twisted pair wires
FR2913840A1 (en) * 2007-03-13 2008-09-19 Sagem Comm AUDIO AND VIDEO DATA BROADCASTING DEVICE

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098233A2 (en) * 1982-06-29 1984-01-11 Siemens Aktiengesellschaft Quad stranding unit for a longitudinally water-tight telecommunication cable
EP0098233A3 (en) * 1982-06-29 1984-02-15 Siemens Aktiengesellschaft Quad stranding unit for a longitudinally water-tight telecommunication cable
US4973794A (en) * 1987-07-31 1990-11-27 General Electric Company Cable assembly for an electrical signal transmission system
GB2208561B (en) * 1987-07-31 1991-11-06 Gen Electric Cable assembly for an electrical signal transmission system
DE4307807A1 (en) * 1993-03-12 1994-09-15 Rheydt Kabelwerk Ag Electrical data transmission element
WO1995004360A1 (en) * 1993-07-30 1995-02-09 Ardnaboha Trading Limited A cable assembly
WO2003005379A1 (en) * 2001-07-06 2003-01-16 The Ludlow Company Lp Cable having annularly arranged set of twisted pair wires
FR2913840A1 (en) * 2007-03-13 2008-09-19 Sagem Comm AUDIO AND VIDEO DATA BROADCASTING DEVICE
WO2008129192A2 (en) * 2007-03-13 2008-10-30 Sagem Communications Sas Device for broadcasting audio and video data
WO2008129192A3 (en) * 2007-03-13 2009-03-19 Sagem Comm Device for broadcasting audio and video data
US8434122B2 (en) 2007-03-13 2013-04-30 Sagem Communications Sas Device for broadcasting audio and video data

Also Published As

Publication number Publication date
GB2059669B (en) 1983-03-30

Similar Documents

Publication Publication Date Title
US3678177A (en) Telecommunication cables
US3622683A (en) Telephone cable with improved crosstalk properties
US4847443A (en) Round transmission line cable
US4323721A (en) Electric cables with improved shielding member
US3927247A (en) Shielded coaxial cable
US5952615A (en) Multiple pair cable with individually shielded pairs that is easy to connect
US5286923A (en) Electric cable having high propagation velocity
US3439111A (en) Shielded cable for high frequency use
US6563052B2 (en) Electric installation cable
US5414215A (en) High frequency electric cable
ES336605A1 (en) Signal transmission cable
DE1172333B (en) Electrical cable with insulated power lines arranged within a common sheath and stranded with one another and shielded, twisted telecommunication wire groups for themselves
EP1327994A2 (en) Flexible electrical lead
US3843830A (en) Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core
CA2435461A1 (en) Electrical cable having an organized signal placement and its preparation
US5321202A (en) Shielded electric cable
DE10303809A1 (en) Data transmission cable for connection to portable devices
US20030188885A1 (en) Connection structure and connection member for electrical connection of power cables
US3312775A (en) Electrical cable
US3707595A (en) Shielded cable
GB2059669A (en) Improvement in or relating to telecommunication cables
GB2142468A (en) Multi-core oil-filled electric cable
EP0213616B1 (en) Combined data transmission line
US3082387A (en) Multi-conductor telecommunication cables for audio and carrier frequencies
DE4420328A1 (en) Flexible, heat-resistant plastic cable sheathing

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee