AU620131B2 - Communication cable - Google Patents
Communication cable Download PDFInfo
- Publication number
- AU620131B2 AU620131B2 AU40152/89A AU4015289A AU620131B2 AU 620131 B2 AU620131 B2 AU 620131B2 AU 40152/89 A AU40152/89 A AU 40152/89A AU 4015289 A AU4015289 A AU 4015289A AU 620131 B2 AU620131 B2 AU 620131B2
- Authority
- AU
- Australia
- Prior art keywords
- communication cable
- layer
- layers
- intermediate 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.)
- Ceased
Links
- 239000004020 conductor Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000001125 extrusion Methods 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 claims 1
- 239000004700 high-density polyethylene Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
B Y Signatut of Applicant To: The Commissioner of Patents 620131 0 0 ft ft
II
ft p ft S ft Gl~1aLg COMMONWEALTH OP AUSTRALIA PATENTS ACT 1952-1969 COMPLETE SPECIFICATION FOR THE INVENTION ENTITLED "COMMUNICATION CABLE" ft
S
S 0 ft
S
ft S ft ft 5'
S
The following statement is a full description of this invention, including the best method of performing it known to us:- 1 1 -MM.&d0a L %J4 A CPL U I= W G441 6~ To: The Commissioner of Patents.
ii f-asp K 44 I r e This invention relates to small diameter communication cables, and in particular to communication cables intended for use with frequencies up to and including the MHz region.
Typically such cables have at least two electric conductors and an outer sheath.
It has been shown that conventional field cable of the aforementioned type can exhibit an increase in attenuation of more than 100% at a frequency of 1.024 MHz when exposed o to light rain.
10 It is an object of the present invention to provide a o 0 communication cable of the aforementioned type which is 0r electrically insensitive to moisture whereby the attenuation 4000 of frequencies in the MHz region remains low and substantially constant when the cable is exposed to wet weather.
000 °According to the invention there is provided a small 0 0* 00B diameter high frequency communication cable, including at least two electric conductors surrounded by a sheath element, wherein said sheath element comprises an arrangement of a non-conducting internal layer, a non-conducting ex- 0* s0 ternal layer and an intermediate layer of partially conductive material.
In order that the invention may be readily carried into effect, an embodiment thereof will now be described in relation to the drawing whose figure shows a section of a communication cable formed according to the invention.
Referring to the drawing, the communication cable comprises two similar separate electric conductors 12, each consisting of a polyethylene insulated tinned copper wire 14. Moreover, the cable also comprises two tension relief elements 16, consisting of a polyethylene insulated stain- S2 j.
ji _kless steel wire 18. The two insulated conductors 12 and the two insulated steel wires 16 are twisted into a compact quad in a known manner. The wires 16 and the conductors 12 are surrounded by a sheath which has been extruded around the whole quad.
As is apparent from the Fig. of the drawing the sheath is composed of three different mutually combined layers.
o. The layers consist of plastic, preferably polyethylene. The o internal layer 20 and the external layer 22 are non- 0 conducting but the intermediate layer 24 is partially conducting.
The assembly has been made by melting the three layers together but, of course, the use of glue or some other assembly method is envisaged.
The internal layer 20 of polyethylene can have a low *o density, whilst the external layer 22 shall consist of a durable plastic with a high density or another durable plaso tic, such as polyamide. The intermediate layer 24 should have a volume resistivity suitable for the line attenuation msa oo .20 level, preferably of the magnitude 10 2 ohm cm, at a tempera ,0 ature 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.
It should be noticed that the sheath on the whole must be proportionately thin, preferably about 0.6 mm, in which case the intermediate layer 24 should have a thickness 0.10 mm.
A communication cable of the kind stated above which has an external diameter of nominally 4.7 mm, gives a line I- attenuation of 12.8 +0.5 dB/km at the temperature 20 0 C, irrespective of the outer weather conditions.
While the present invention has been described with regard to many particulars, it is understood that equivalents may be readily substituted without departing from the scope of the invention.
0 0 0 040 0
Claims (7)
1. A small diameter high frequency communication cable, including at least two electric conductors surrounded by a sheath clement, wherein said sheath element comprises an arrangement of a non-conducting internal layer, a non-conducting ex- ternal layer and an intermediate layer of partially conductive material.
2. A communication cable as claimed in claim I, wherein said layers are of plas- tics material.
3. A communication cable as claimed in claim 2, wherein said plastics material is polyethylene. 10
4. A communication cable as claimed in any one of the preceding claims, wherein said layers are adhered together by melting during extrusion of said layers. C 4
5. A communication cable as claimed in any one of the preceding claims, wherein said internal layer is of low density polycthylene, the external layer is of high density polyethylene or polyamide, and the intermediate layer is of partially conductive polyethylene having a suitable volume resistivity,
6. A communication cable as claimed in claim 5, wherein said volume resistivity of the intermediate layer is 102 ohm cm. i
7. A communication cable substantially as herein described with reference to the figure of the drawing. ii tt .1 t. DATED THIS ELEVENTH DAY OF NOVEMBER 1991 ALCATEL N.V. :i SO RAiK J
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8803126 | 1988-09-06 | ||
| SE8803126A SE468871B (en) | 1988-09-06 | 1988-09-06 | SMALL COMMUNICATION CABLE INTENDED FOR FREQUENCY UP TO AND WITH THE MHZ AREA |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU4015289A AU4015289A (en) | 1990-03-15 |
| AU620131B2 true AU620131B2 (en) | 1992-02-13 |
Family
ID=20373236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU40152/89A Ceased AU620131B2 (en) | 1988-09-06 | 1989-08-24 | Communication cable |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0422306B1 (en) |
| AU (1) | AU620131B2 (en) |
| DK (1) | DK169932B1 (en) |
| FI (1) | FI95419C (en) |
| NO (1) | NO176458C (en) |
| SE (1) | SE468871B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2712115A1 (en) * | 1993-11-05 | 1995-05-12 | Filotex Sa | Screened cable, having a low level of noise and a high service temperature |
| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0049639A1 (en) * | 1980-10-08 | 1982-04-14 | RAYCHEM CORPORATION (a California corporation) | Low noise cable |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3668298A (en) * | 1969-12-10 | 1972-06-06 | Bell Telephone Labor Inc | Multiconductor communications cable |
| NO140249C (en) * | 1977-04-28 | 1979-07-25 | Elektrisitetsforsyning | STRONG CURRENT CABLE WHICH IS RESISTANT TO THE FORMATION OF WATER TREES IN THE INSULATION AND PROCEDURE FOR THE MANUFACTURE OF SUCH CABLE |
| GB8704938D0 (en) * | 1987-03-03 | 1987-04-08 | Bp Chem Int Ltd | Cables |
-
1988
- 1988-09-06 SE SE8803126A patent/SE468871B/en not_active IP Right Cessation
-
1989
- 1989-08-24 AU AU40152/89A patent/AU620131B2/en not_active Ceased
- 1989-08-24 NO NO893402A patent/NO176458C/en unknown
- 1989-09-01 FI FI894129A patent/FI95419C/en not_active IP Right Cessation
- 1989-09-05 DK DK437789A patent/DK169932B1/en not_active IP Right Cessation
- 1989-10-09 EP EP89402777A patent/EP0422306B1/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0049639A1 (en) * | 1980-10-08 | 1982-04-14 | RAYCHEM CORPORATION (a California corporation) | Low noise cable |
Also Published As
| Publication number | Publication date |
|---|---|
| DK169932B1 (en) | 1995-04-03 |
| FI95419B (en) | 1995-10-13 |
| NO176458C (en) | 1995-04-05 |
| SE8803126D0 (en) | 1988-09-06 |
| FI95419C (en) | 1996-01-25 |
| NO176458B (en) | 1994-12-27 |
| SE468871B (en) | 1993-03-29 |
| DK437789A (en) | 1990-03-07 |
| NO893402L (en) | 1990-03-07 |
| EP0422306B1 (en) | 1995-11-22 |
| EP0422306A1 (en) | 1991-04-17 |
| FI894129L (en) | 1990-03-07 |
| FI894129A0 (en) | 1989-09-01 |
| DK437789D0 (en) | 1989-09-05 |
| AU4015289A (en) | 1990-03-15 |
| SE8803126L (en) | 1990-03-07 |
| NO893402D0 (en) | 1989-08-24 |
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