EP0422306B1 - Communication cable - Google Patents
Communication cable Download PDFInfo
- Publication number
- EP0422306B1 EP0422306B1 EP89402777A EP89402777A EP0422306B1 EP 0422306 B1 EP0422306 B1 EP 0422306B1 EP 89402777 A EP89402777 A EP 89402777A EP 89402777 A EP89402777 A EP 89402777A EP 0422306 B1 EP0422306 B1 EP 0422306B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- communication cable
- intermediate layer
- cable according
- layer
- polyethylene
- 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 - Lifetime
Links
Images
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
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
-
- 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
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1058—Screens specially adapted for reducing interference from external sources using a coating, e.g. a loaded polymer, ink or print
- H01B11/1066—Screens specially adapted for reducing interference from external sources using a coating, e.g. a loaded polymer, ink or print the coating containing conductive or semiconductive material
-
- 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
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/187—Sheaths comprising extruded non-metallic layers
Definitions
- the present invention relates to a thin communication cable which is non-sensitive to moisture from an electrical point of view.
- a communication cable is especially intended for use in frequencies up to and including the MHz-region.
- the cable is provided with at least two electric conductors and a surrounding sheath.
- a conventional field thin cable including one, two, or more, pairs of insulated communication wires intended for use at frequencies up to and including the MHz-region, with surrounding sheath, can get an electric line attenuation increase of more than 100% at for instance drizzle at the frequency 1.024 MHz which is considerably more than previously used frequencies.
- the purpose of the invention is therefore in the first place to provide a communication cable, the electric line attenuation of which holds a low and continuous level also when the cable is subjected to moisture or varying external environment with respect to the weather conditions when using one and the same frequency.
- the sheath is composed of three different, mutually combined layers - an internal layer, an external layer and an intermediate layer - and that the intermediate layer consists of a semiconductor material.
- Said electrical line attenuation can be of the magnitude ⁇ 14 dB/km at 1.024 MHz.
- the Fig. shown on the enclosed drawing discloses a section of a communication cable which is formed according to the principles of the invention.
- the communication cable 10 in said Fig. is a so-called two-wire-cable but the invention can, of course, be applicable to a cable with two or more pairs of wires.
- the communication cable comprises two similar separate electric conductors 12, each consisting of a polyethylene insulated tinned copper wire 14.
- the cable also comprises two tension relieve elements 16, which in this case each consists of a polyethylene insulated stainless steel wire 18.
- the two insulated conductors 12 and the two insulated steel wires 16 are twisted to a compact quad in a manner known per se.
- the wires 16 and the conductors 12 are surrounded by a sheath which has been fill extruded around the whole quad.
- the sheath is composed of three different mutually combined layers.
- the layers consist of plastic, preferably polyethylene.
- the internal layer 20 and the external layer 22 are non-conducting but the intermediate layer 24 is semi-conducting.
- the assembly has been made by melting the three layers in one single moment but, of course, the use of glue or some other assembly method may be imagined.
- the internal layer 20 of polyethylene can have a low density, whilst the external layer 22 shall consist of a durable plastic with a high density or another durable plastic, for instance polyamide.
- the intermediate layer 24 should have a volume resistivity suitable for the line attenuation level, preferably of the magnitude 102 ⁇ cm, at at temperature of 20°. For the purpose intended it is suitable that the internal layer 20 is between four and six times thicker than the intermediate layer 24.
- the sheath on the whole must be proportionately thin, for the exemplified two-wire-cable about 0.6 mm, in which case the intermediate layer 24 should have a thickness ⁇ 0.10 mm.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Insulated Conductors (AREA)
- Communication Cables (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89402777T ATE130697T1 (de) | 1989-10-09 | 1989-10-09 | Nachrichtenkabel. |
DE68924915T DE68924915T2 (de) | 1989-10-09 | 1989-10-09 | Nachrichtenkabel. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8803126A SE468871B (sv) | 1988-09-06 | 1988-09-06 | Klen kommunikationskabel avsedd foer frekvenser upp till och med mhz-omraadet |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0422306A1 EP0422306A1 (en) | 1991-04-17 |
EP0422306B1 true EP0422306B1 (en) | 1995-11-22 |
Family
ID=20373236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89402777A Expired - Lifetime EP0422306B1 (en) | 1988-09-06 | 1989-10-09 | Communication cable |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0422306B1 (da) |
AU (1) | AU620131B2 (da) |
DK (1) | DK169932B1 (da) |
FI (1) | FI95419C (da) |
NO (1) | NO176458C (da) |
SE (1) | SE468871B (da) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2712115A1 (fr) * | 1993-11-05 | 1995-05-12 | Filotex Sa | Câble blindé, à faible niveau de bruit et de température de service élevée. |
AU5191801A (en) | 2001-06-14 | 2002-12-19 | Pirelli Cables Australia Limited | Communications cable provided with a crosstalk barrier for use at high transmission frequencies |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3668298A (en) * | 1969-12-10 | 1972-06-06 | Bell Telephone Labor Inc | Multiconductor communications cable |
WO1988006741A1 (en) * | 1987-03-03 | 1988-09-07 | Union Carbide Benelux N.V. | Cable containing water-blocking material |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO140249C (no) * | 1977-04-28 | 1979-07-25 | Elektrisitetsforsyning | Sterkstroemkabel som er motstandsdyktig overfor dannelse av vanntraer i isolasjonen samt fremgangsmaate for fremstilling av slik kabel |
US4486252A (en) * | 1980-10-08 | 1984-12-04 | Raychem Corporation | Method for making a low noise cable |
-
1988
- 1988-09-06 SE SE8803126A patent/SE468871B/sv not_active IP Right Cessation
-
1989
- 1989-08-24 NO NO893402A patent/NO176458C/no unknown
- 1989-08-24 AU AU40152/89A patent/AU620131B2/en not_active Ceased
- 1989-09-01 FI FI894129A patent/FI95419C/fi not_active IP Right Cessation
- 1989-09-05 DK DK437789A patent/DK169932B1/da not_active IP Right Cessation
- 1989-10-09 EP EP89402777A patent/EP0422306B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3668298A (en) * | 1969-12-10 | 1972-06-06 | Bell Telephone Labor Inc | Multiconductor communications cable |
WO1988006741A1 (en) * | 1987-03-03 | 1988-09-07 | Union Carbide Benelux N.V. | Cable containing water-blocking material |
Also Published As
Publication number | Publication date |
---|---|
AU620131B2 (en) | 1992-02-13 |
FI95419B (fi) | 1995-10-13 |
NO893402D0 (no) | 1989-08-24 |
DK437789D0 (da) | 1989-09-05 |
NO176458B (no) | 1994-12-27 |
FI95419C (fi) | 1996-01-25 |
DK169932B1 (da) | 1995-04-03 |
FI894129A0 (fi) | 1989-09-01 |
SE8803126L (sv) | 1990-03-07 |
SE8803126D0 (sv) | 1988-09-06 |
AU4015289A (en) | 1990-03-15 |
FI894129A (fi) | 1990-03-07 |
DK437789A (da) | 1990-03-07 |
NO176458C (no) | 1995-04-05 |
NO893402L (no) | 1990-03-07 |
EP0422306A1 (en) | 1991-04-17 |
SE468871B (sv) | 1993-03-29 |
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