CN201327733Y

CN201327733Y - High-speed parallel symmetrical data cable

Info

Publication number: CN201327733Y
Application number: CNU2008202382886U
Authority: CN
Inventors: 颜君
Original assignee: CHANGSHU HL ELECTRIC WIRE CABLE Co Ltd
Current assignee: Changshou City Jing Hong Sheng communication Polytron Technologies Inc
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2009-10-14
Anticipated expiration: 2018-12-19

Abstract

The utility model relates to a high-speed parallel symmetrical data cable, which belongs to the technical field of signal transmission cables. The data cable comprises at least one wire pair and an outer sheath; each wire pair comprises a first wire core and a second wire core respectively, wherein the first wire core comprises a first conductor and a first insulating layer covered outside the first conductor in a squeezing way; the second wire core comprises a second conductor and a second insulating layer covered outside the second conductor in a squeezing way; the first wire core and the second wire core are attached to each other and are parallel in the length direction; each wire pair is wrapped with a first shielding layer; and the outer sheath is positioned outside the first shielding layer. The data cable has the advantages that uneven clearances generated by pair twist in the prior art are eliminated; the distance between the first wire core and the second wire core is ensured to be consistent; the guarantee for the ideal characteristic impedance is provided for the first wire core and the second wire core, so that the attenuation and the loop loss are effectively reduced.

Description

High speed parallel symmetric data cable

Technical field

The utility model belongs to technical field of signal transmission cables, is specifically related to a kind of high speed parallel symmetric data cable.

Background technology

Data cable particularly has been no lack of in the Chinese patent literature at document and has been seen in, and for example utility model patent Granted publication CN2845120Y has recommended a kind of data cable that has conductive plastic shielding layer, CN201051425Y has introduced a kind of independent data cable that divides shielding that has, CN2758948Y has disclosed anti-interference high-speed data cable, CN1183553C discloses a kind of high-speed data cable with individually shielded twisted pairs, the public all a kind of star quad stranding type data cables of CN201081801Y, CN101174495A has disclosed a kind of armored data cable, CN2758946Y has recommended a kind of shielding high-speed data cable and CN2609126Y to instruct a kind of high shielded enclosure external application data cable.In above-mentioned document, except CN201081801Y and CN101174495A, all launch around improving shield effectiveness, wherein, when being intended to improve transmission performance, the technical scheme that CN201081801Y disclosed strengthens humidity resistance, mechanical strength and the withstand voltage properties of cable, to the attenuation problem of data cable, patent has used the foaming layer of foaming+real core polyolefin layer insulation to ensure; Therefore the core of CN101174495A is to improve the compressive resistance and the radiation proof mouse bite preventing of data cable, and this data cable obviously is an outside cable and for burying use underground.

The reason known as industry, as data cable, the importance that postpones poor (SKEW) along with the increase of transmission speed increases the important indicator that becomes high-speed data cable day by day, the size of decay and loop loss simultaneously also is crucial technical indicator, yet, comprise that deficiency embodies gratifying delay poor (Skew) and decay and the little effect of loop consumption mistake because there is shortcoming in structure for data cable in the prior art of all patent application technical schemes that the applicant exemplifies in the above.Specifically can be by shown in Figure 4, because the line of data cable is to there being 1 pair usually, 2 pairs, 4 pairs, 8 pairs and 16 pairs, even reach 100 pairs, therefore it is right to figure 4 illustrates four pairs of lines as just an example, be that this data cable comprises that line is to 1 and oversheath 2, line is contained in the oversheath 21, each line comprises first to 1, second core 11,12, first core 11 comprises first conductor 111 and squeezes first insulating barrier 112 that overlays on outside first conductor 111, second core 12 comprises second conductor 121 and crowded second insulating barrier 122 that overlays on outside second conductor 121, wherein: first, second core 11,12 carry out each other stranded.This structure will certainly cause decaying and the big problem of loop loss, because with first, second core 11,12 implement stranded after, can occur on the contrary becoming flexible between first, second core 11,12, and owing to the stranded space that produces is both irregular also inhomogeneous, thereby influence the ability of data cable transmission signals, make the loss of decay and loop big.Reason is very simple, the distance each other that is caused behind first, second core 11,12 pair twists is inconsistent, thereby the meeting not of uniform size of distance causes the variation of the characteristic impedance of first, second core 11,12 and causes bigger delay poor, decay and loop loss, signal produces bigger fluctuation thereby cause in use.

In view of said circumstances, be necessary the structure of the data cable in the prior art is improved, technical scheme described below is based on producing under this background.

Summary of the invention

Task of the present utility model be to provide a kind of can reduce effectively to postpone poor, decay and reduce the high speed parallel symmetric data cable of loop loss.

Task of the present utility model is finished like this, a kind of high speed parallel symmetric data cable, it comprise at least one pair of line to and oversheath, every pair of line is to comprising first, second core, first core comprises first conductor and squeezes first insulating barrier that overlays on outside first conductor, and second core comprises second conductor and squeeze second insulating barrier that overlays on outside second conductor, described first, second core against each other and constitute parallel at length direction, described each line first screen that externally has been wrapped, described oversheath is positioned at outside described first screen.

In a specific embodiment of the present utility model, described line is to also including an earth connection, and earth connection is followed in described first, second core and is coated in described first screen at length direction.

In another specific embodiment of the present utility model, described first screen is provided with the secondary shielding layer outward, is provided with the 3rd screen outside the secondary shielding layer, and described oversheath is positioned at outside the 3rd screen.

Go back in the specific embodiment of the present utility model, described first, second screen respectively is a metallic film.

In another specific embodiment of the present utility model, described metallic film is aluminium foil polyester belt laminated film or Copper Foil polyester belt laminated film.

In another specific embodiment of the present utility model, described metallic film is an aluminium foil polyester belt laminated film.

More of the present utility model and in specific embodiment, described the 3rd screen is the metal wire knitted net.

The technical scheme that the utility model is recommended, because will constitute first, second right core of line constitutes against each other and keeping parallelism at length direction, therefore eliminated the gap of evenly differing that produces because of pair twist in the prior art, guaranteed that the distance between first, second core is consistent, provide guarantee for first, second core has the Ideal Characteristics impedance, made the loss of decay and loop obtain effectively reducing.

Description of drawings

Fig. 1 is a specific embodiment structure chart of the present utility model.

Fig. 2 is another specific embodiment structure chart of the present utility model.

Fig. 3 is the cutaway view of Fig. 2.

Fig. 4 is the structure chart of the data cable in the prior art.

Embodiment

Embodiment 1

See Fig. 1, according to the known general knowledge of industry, the line of data cable to 1 have a pair of, two pairs, four pairs, eight pairs and 16 pairs, even reach up to a hundred right.In view of this, can not deny to reach all the other because of having exemplified a pair of among Fig. 1 of the present utility model.Because each line in same single data cable is on all four to 1 structure, so the applicant only selects one and is described.Each line comprises first, second core 11,12 to 1, and first core 11 comprises first conductor 111 and squeezes first insulating barrier 112 that protects outside first conductor 111, similarly, second core 12 comprises second conductor 121 and squeezes second insulating barrier 122 that protects outside second conductor 121.First, second core the 11, the 12nd gets together each other, and more particularly, first, second core 11,12 is keeping parallelism along its length under the state that reclines mutually each other.In order to make the electric current that comes from screen import the earth, therefore promptly follow in first, second core 11,12 to have added an earth connection 13 at the length direction of first, second core 11,12.By Fig. 1 finding, each line is a metallic film to 1 outer first screen, 3, the first screens 3 that are wrapped, and selects aluminium foil polyester belt laminated film as first screen 3 in the present embodiment, but does not repel other metallic films such as Copper Foil or tinfoil paper.Here said aluminium foil polyester belt laminated film is meant the film that aluminium foil and polyester film are mutually compound.Illustrated a pair of line is housed inside in the oversheath 21.

Embodiment 2:

Ask for an interview a pair of line that Fig. 2 and Fig. 3 illustrate in the drawings and promptly show the situation of two lines the 1 outer secondary shielding layer 4 that is wrapped to 1.If line has four pairs or six pairs or eight pairs to 1 even to 100 pairs, so by secondary shielding layer 4 with four pairs or six pairs or the eight pairs of lines in addition up to a hundred line is implemented to be wrapped to 1, the material of secondary shielding layer 4 is as the description to first screen 3.The effect of secondary shielding layer 4 can hide resistance with the space that is positioned at the 3rd screen 5 in its outside, because the 3rd screen 5 is the structure of metal wire knitted, the eyelet that exists is more, thereby make the outer surface out-of-flatness and influence shield effectiveness, therefore improve flatness or claim smoothness to use the raising shield effectiveness by secondary shielding layer 4, at the 3rd screen 5 peripheral hardware oversheaths 2.Present embodiment is owing to be that two lines are to 1, therefore two lines are stranded to carrying out between 1, the anti-song that can increase cable after stranded is disturbed ability, be that line adopts the stranded hard and unbending shortcoming of parallel lines that remedies each other to 1, first, second core 11,12 keeping parallelisms of 1 are not promptly done stranded and constitute same line, can be made that same line is poor to the delay in 1, decay and loop loss be able to reduce ultimate attainmently.All the other are with the description to embodiment 1.

By for example having the technique effect shown in the following table in the resulting high speed parallel symmetric data of the foregoing description cable and the prior art by shown in Figure 4 line is compared 1 data cable of implementing pair twist.

The contrast content	Prior art	Embodiment of the present utility model
The contrast content	Prior art	Embodiment of the present utility model	Poor with the delay that a pair of line is internal	30ps/M	5ps/M

Claims

1, a kind of high speed parallel symmetric data cable, it comprises that at least two pairs of lines are to (1) and oversheath (2), every pair of line comprises first to (1), second core (11,12), first core (11) comprises first conductor (111) and squeezes first insulating barrier (112) that overlays on outside first conductor (111), and second core (12) comprises second conductor (121) and squeeze second insulating barrier (122) that overlays on outside second conductor (121), it is characterized in that described first, second core (11,12) against each other and constitute parallel at length direction, described each line is to (1) outer first screen (3) that has been wrapped, and described oversheath (2) is positioned at outside described first screen (3).

2, high speed parallel symmetric data cable according to claim 1, it is characterized in that described line also includes an earth connection (13) to (1), earth connection (13) is followed in described first, second core (11,12) and is coated in described first screen (3) at length direction.

3, high speed parallel symmetric data cable according to claim 1 and 2, it is characterized in that the outer secondary shielding layer (4) that is provided with of described first screen (3), be provided with the 3rd screen (5) outside secondary shielding layer (4), described oversheath (2) is positioned at outside the 3rd screen (5).

4, high speed parallel symmetric data cable according to claim 3 is characterized in that described first, second screen (3,4) respectively is metallic film.

5, high speed parallel symmetric data cable according to claim 4 is characterized in that described metallic film is aluminium foil polyester belt laminated film or Copper Foil polyester belt laminated film.

6, high speed parallel symmetric data cable according to claim 5 is characterized in that described metallic film is an aluminium foil polyester belt laminated film.

7, high speed parallel symmetric data cable according to claim 3 is characterized in that described the 3rd screen (5) is the metal wire knitted net.