CN202584912U - High flame retardation symmetrical cable for local area network - Google Patents
High flame retardation symmetrical cable for local area network Download PDFInfo
- Publication number
- CN202584912U CN202584912U CN 201220108003 CN201220108003U CN202584912U CN 202584912 U CN202584912 U CN 202584912U CN 201220108003 CN201220108003 CN 201220108003 CN 201220108003 U CN201220108003 U CN 201220108003U CN 202584912 U CN202584912 U CN 202584912U
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- twisted wire
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Abstract
Disclosed is a high flame retardation symmetrical cable for local area network, comprising four wire-twisting units twisted by a first wire-twisting pair, a second wire-twisting pair, a third wire-twisting pair, and a fourth wire-twisting pair which are arranged in an anticlockwise order, wherein the pitch of the first wire-twisting pair and the third wire-twisting pair is smaller than that of the second wire-twisting pair and the fourth wire-twisting pair; the first wire-twisting pair and the third wire-twisting pair as well as the second wire-twisting pair and the fourth wire-twisting pair are arranged in alternate; the pitch of the first wire-twisting pair is greater than that of the third wire-twisting pair; the pitch of the second wire-twisting pair is smaller than that of the fourth wire-twisting pair; the external surface of the four wire-twisting units is coated by a mica composite belt; the external surface of the mica composite belt is coated by a brass wire braid ply; and the external surface of the brass wire braid ply is coated by a low smoke halogen free sheath layer. The high flame retardation symmetrical cable is capable of reducing the near-end overhearing interference of the cable, raising the far end crosstalk ratio of the cable, improving the quality of the cable transmission signal, and meeting the broadband and digitlization transmission requirements in the program controlled exchange communication system.
Description
Technical field
The utility model relates to a kind of innings and uses symmetrical cable, relates in particular to a kind of high flame retardant local area network (LAN) and uses symmetrical cable.
Background technology
Along with economic development and urban construction and development, fire damage is in rising trend, therefore all the control of fire is very paid attention to both at home and abroad.Cable is as one of the important generation source of fire and propagating source; Because producing in a large number, toxic and harmful causes the personnel death during its cable fire; Equipment is undermined the harm that personnel can not in time be withdrawn owing to smog, has more and more seriously influenced the generation of disaster.
Be applied to the fire-retardant broadband type programme-controlled exchange telecommunication cable of programmed communication system at present, be in the starting stage at home, domestic have part enterprise also developing portioned product; Generally be to be coated on uniformly on single core copper conductor with high speed insulated type polyethylene; Carry out pair twist through pair twist equipment, use insulation PE polyester belt to coat many pair twists then, use polyvinylchloride to carry out sheath at last and extrude line; This kind structure is unfavorable for the generation source of fire and the control of propagating source, and transmission bandwidth is very narrow.Therefore, how to develop and a kind ofly can reduce that the cable near-end crosstalk is disturbed and improve the cable far-end crosstalk ratio, improved the symmetrical cable of cable transmission signal quality, become the direction that those of ordinary skills make great efforts.
Summary of the invention
The utility model provides a kind of high flame retardant local area network (LAN) to use symmetrical cable; This symmetrical cable helps reducing the interference of cable near-end crosstalk and improves the cable far-end crosstalk ratio; Improve the cable transmission quality of signals, adapted to broadband in the programme-controlled exchange communication system, digitized transmission needs.
For achieving the above object; The technical scheme that the utility model adopts is: a kind of high flame retardant local area network (LAN) is used symmetrical cable; Comprise: four by first twisted wire of counterclockwise arrangement to, second twisted wire to, the 3rd twisted wire twisted wire unit to forming with the 4th twisted wire strand; First twisted wire to the right pitch of the 3rd twisted wire less than second twisted wire to the pitch right with the 4th twisted wire; First twisted wire to the 3rd twisted wire pair and second twisted wire to the 4th twisted wire to alternately, the right pitch of said first twisted wire is greater than the right pitch of the 3rd twisted wire, the right pitch of said second twisted wire is less than the right pitch of the 4th twisted wire; One mica composite band is wrapped in these four twisted wire unit outer surfaces; One copper wire braid is coated on said mica composite band outer surface; One low smoke and zero halogen restrictive coating is coated on said copper wire braid outer surface, one as the copper cash of drain wire between said mica composite band and copper wire braid.
It is following that technique scheme is further improved technical scheme:
1. in the such scheme, the right pitch of said first twisted wire is 15.5mm, and the right pitch of said second twisted wire is 19.0mm, and the right pitch of said the 3rd twisted wire is 13.5mm, and the right pitch of said the 4th twisted wire is 22.5mm.
2. in the such scheme, said copper cash outer surface is coated with the tin layer.
Because the technique scheme utilization, the utility model compared with prior art has advantage:
The utility model high flame retardant local area network (LAN) is used symmetrical cable; Four twisted wires make up pitch adopting specific strand in the twisted wire unit; The appropriate design laying up pitch; Help reducing the interference of cable near-end crosstalk and improve the cable far-end crosstalk ratio, improved the cable transmission quality of signals, adapt to broadband, digitized transmission needs in the programme-controlled exchange communication system; Secondly, improved signal transmission quality, improved the fire-retardant fireproof property of cable and alleviate purposes such as outside electromagnetic interference and Digital Transmission with the tropism to the full extent, the circuit effective propagation path also obtains certain expansion; Once more, the tinned conductor wire sheathing also helps further reducing the interference of cable near-end crosstalk and improves the cable far-end crosstalk ratio, has improved the cable transmission quality of signals.
Description of drawings
Accompanying drawing 1 is that the utility model high flame retardant local area network (LAN) is used the symmetrical cable structural representation.
In the above accompanying drawing: 1, first twisted wire is right; 2, second twisted wire is right; 3, the 3rd twisted wire is right; 4, the 4th twisted wire is right; 5, twisted wire unit; 6, mica composite band; 7, copper wire braid; 8, low smoke and zero halogen restrictive coating; 9, copper cash; 10, tin layer.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Embodiment: a kind of high flame retardant local area network (LAN) is used symmetrical cable; Comprise: four first twisted wires by counterclockwise arrangement to 1, second twisted wire to the 2, the 3rd twisted wire to the 3 and the 4th twisted wire to the 4 stranded twisted wire unit 5 that form; First twisted wire to the 1 and the 3rd twisted wire to 3 pitch less than second twisted wire to the 2 and the 4th twisted wire to 4 pitch; First twisted wire to the 1 and the 3rd twisted wire to 3 and second twisted wire to the 2 and the 4th twisted wire to 4 alternately; Said first twisted wire to 1 pitch greater than the 3rd twisted wire to 3 pitch, said second twisted wire to 2 pitch less than the 4th twisted wire to 4 pitch; One mica composite band 6 is wrapped in these four twisted wire unit 5 outer surfaces; One copper wire braid 7 is coated on said mica composite band 6 outer surfaces; One low smoke and zero halogen restrictive coating 8 is coated on said copper wire braid 7 outer surfaces, one as the copper cash 9 of drain wire between said mica composite band 6 and copper wire braid 7.
Above-mentioned first twisted wire is 15.5mm to 1 pitch, and said second twisted wire is 19.0mm to 2 pitch, and said the 3rd twisted wire is 13.5mm to 3 pitch, and said the 4th twisted wire is 22.5mm to 4 pitch.
Above-mentioned copper cash 9 outer surfaces are coated with tin layer 10.
Above tinned copper wire quality requirement: the tin-coated copper single line must not reveal copper, and tin coating must not have list edge, tin-coated copper single line non-oxidation, pit; Above tincopper fuse wire braided armor quality requirement: the stranded conductor structure should be closely, no loose, and braid should be even, and the surface should be smooth.Braid does not allow integral body to continue, and strand can weld or peg graft.Joint should be pruned smooth.
Above-mentioned mica composite band technical indicator:
Be suitable for fire-resistant scope: 800～1000 ℃;
Tensile strength: >=75N/cm;
Dielectric strength: >=9.5Kv/mm;
In the cable production process, material, equipment, frock etc. are carried out science, reasonably design and control, coat becoming core to carry out mica aluminium foil composite band, and use the zinc-plated braided wires of multiply to weave.
It is that 38% low smoke and zero halogen protective cover material carries out sheath that total braid cable core is used oxygen index, and the insulation shrinkage test :≤5% (treatment temperature: 232 ± 2 ℃, handled 1 hour), the detection of product: the electric property to product detects evaluation.Product is monitored in the application system running status.
When adopting above-mentioned high flame retardant local area network (LAN) to use symmetrical cable; Four twisted wires make up pitch adopting specific strand in the twisted wire unit; The appropriate design laying up pitch; Help reducing the interference of cable near-end crosstalk and improve the cable far-end crosstalk ratio, improved the cable transmission quality of signals, adapt to broadband, digitized transmission needs in the programme-controlled exchange communication system; Secondly, improved signal transmission quality, improved the fire-retardant fireproof property of cable and alleviate purposes such as outside electromagnetic interference and Digital Transmission with the tropism to the full extent, the circuit effective propagation path also obtains certain expansion; Once more, the tinned conductor wire sheathing also helps further reducing the interference of cable near-end crosstalk and improves the cable far-end crosstalk ratio, has improved the cable transmission quality of signals.
The foregoing description only is the technical conceive and the characteristics of explanation the utility model, and its purpose is to let the personage who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection range of the utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the utility model.
Claims (3)
1. a high flame retardant local area network (LAN) is used symmetrical cable; It is characterized in that: comprising: four by first twisted wire of counterclockwise arrangement to (1), second twisted wire to (2), the 3rd twisted wire to (3) and the 4th twisted wire to (4) the stranded twisted wire unit (5) that forms; First twisted wire to (1) and the 3rd twisted wire to the pitch of (3) less than second twisted wire to (2) and the 4th twisted wire pitch to (4); First twisted wire to (1) and the 3rd twisted wire to (3) and second twisted wire to (2) and the 4th twisted wire to (4) alternately; Said first twisted wire to the pitch of (1) greater than the pitch of the 3rd twisted wire to (3), said second twisted wire to the pitch of (2) less than the pitch of the 4th twisted wire to (4); One mica composite band (6) is wrapped in this four twisted wire unit (5) outer surface; One copper wire braid (7) is coated on said mica composite band (6) outer surface; One low smoke and zero halogen restrictive coating (8) is coated on said copper wire braid (7) outer surface, and a copper cash as drain wire (9) is positioned between said mica composite band (6) and the copper wire braid (7).
2. symmetrical cable according to claim 1; It is characterized in that: said first twisted wire is 15.5mm to the pitch of (1); Said second twisted wire is 19.0mm to the pitch of (2); Said the 3rd twisted wire is 13.5mm to the pitch of (3), and said the 4th twisted wire is 22.5mm to the pitch of (4).
3. symmetrical cable according to claim 1 is characterized in that: said copper cash (9) outer surface is coated with tin layer (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108003 CN202584912U (en) | 2012-03-21 | 2012-03-21 | High flame retardation symmetrical cable for local area network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108003 CN202584912U (en) | 2012-03-21 | 2012-03-21 | High flame retardation symmetrical cable for local area network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202584912U true CN202584912U (en) | 2012-12-05 |
Family
ID=47254300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220108003 Expired - Fee Related CN202584912U (en) | 2012-03-21 | 2012-03-21 | High flame retardation symmetrical cable for local area network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202584912U (en) |
-
2012
- 2012-03-21 CN CN 201220108003 patent/CN202584912U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150321 |
|
| EXPY | Termination of patent right or utility model |