CN1838338A - E1 coaxial cable and method for shielding electromagnetic interference when connecting to E1 interface - Google Patents
E1 coaxial cable and method for shielding electromagnetic interference when connecting to E1 interface Download PDFInfo
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- CN1838338A CN1838338A CN 200610076644 CN200610076644A CN1838338A CN 1838338 A CN1838338 A CN 1838338A CN 200610076644 CN200610076644 CN 200610076644 CN 200610076644 A CN200610076644 A CN 200610076644A CN 1838338 A CN1838338 A CN 1838338A
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Abstract
This invention discloses an E1 coaxial cable, which includes the coaxial outer signal backflow layer, the insulating layer and insulating jacket outside the backflow layer, the character of which is that the there also includes a metal shielding layer between the jacket and the insulating layer. This invention also discloses an electromagnetic shielding method when the cable connects with the E1 interface, the steps includes: electric connecting the metal shielding layer 406 with the earthing metal casing and the metal board at the place where the coaxial cable is imported into the subframe and the metal board of E1 veneer; or electric connecting the metal shielding layer 406 with the earthing metal casing, the subframe metal casing and the metal board.
Description
Technical field
The present invention relates to the network equipment structural manufacturing process of communication field, particularly the structure of E1 coaxial cable and the method for shield electromagnetic interference when being connected thereof with the E1 interface.
Background technology
Union of International Telecommunication points out in the suggestion ITU.TG.703 (2001,11) " Physical/electrical characteristics of hierarchical digitalinterfaces " about synchrodata system electrical interface physical characteristic: suggestion is outer metal level (outerconductor) ground connection of sending and receiving port with 75 Europe E1 coaxial lines; Also point out simultaneously: when Transmitting and Receiving End all during ground connection, may be because the epd at sending and receiving two ends causes the existence of ground circulation, and cause transmission error code (errors) even port permanent failure (permanent damage), advise making a start a mouthful ground connection in this case, and the receiving end mouth is earth-free.
Consider the problem of ground circulation, some 75 Europe E1 interfaces can adopt mode single-end earthed when design, and this mode can increase the difficulty of electromagnetic compatibility (EMC) aspect, as conduct emission and strengthen, radiated emission strengthens, electromagnetic pulse-resisting string decreased performance, anti-conduction interference decreased performance, radioresistance harassing and wrecking decreased performance, or the like.Coaxial line has better anti-jamming capability theoretically, this puts the relevant (see figure 1) of metal outer as the signal backflow with it, usually also this layer is called screen (for not with Fig. 2 in the extra metal screen layer 406 that increases obscure mutually, in this article this layer is called signal reflux layer 402) because it can isolate the inside and outside electromagnetic field of cable.There is some shielding action that must be noted that it necessarily to depend on the good ground connection of signal reflux layer 402.If the E1 signal adopts the mouth mode single-end earthed of making a start, the signal reflux layer of receiving end mouth does not just satisfy the requirement of good earth so, and the approach of releasing of interference is insulated layer 403 and intercepts, thereby the antijamming capability of signal just descends.According to the principle of the interference of electromagnetic field and anti-interference reciprocity, mode also will cause the electromagnetic interference of taking out of from the E1 interface of equipment to increase single-end earthed.
Fig. 3 is the schematic diagram of the earth-free EMC interference path of receiving end.In order to reach good electromagnetic compatibility effect, associated communication all can select for use metal material to make E1 panel of the board, sub-frame casing, frame casing at present.When the signal transmitting and receiving end all adopts earthing mode, and the E1 interface can be installed on the metal decking, so the reflux layer 402 of every holding wire can connect the metal decking of E1 interface board at the metal decking place at E1 interface place by reflux layer 402, and metal decking is ground connection again.Like this signal reflux layer 402, metal decking, the shield interface formed can isolate the internal and external interference at E1 interface board, holding wire interface.But because receiving end can not ground connection, the complete screen of E1 metal decking just is insulated layer 405 (the perhaps insulation distance of insulating barrier 403 or air) and destroys, and the electromagnetic interference of panel both sides will be invaded mutually and can't isolate along the E1 line; Pass in and out the position of sub-frame, frame at the E1 interface, insulating barrier 405 has destroyed the shield interface of sub-frame, frame, and the electromagnetic interference that sub-frame is inside and outside, frame is inside and outside will be invaded mutually and can't isolate along the E1 line.
Head it off has dual mode at present, a kind of is with the mode ground connection of receiving end mouth by little electric capacity, the effect of little electric capacity is to consider to remove High-frequency Interference, another kind method is a reload signal feed-through capacitor filter on interface, the general character of these two kinds of methods is all need carry out filtering on each receiving port, the device space has performance difficulty in limited time in that port number is numerous, and two kinds of methods have all only been considered the electromagnetic compatibility problem of E1 interface itself, do not consider the E1 interface, the E1 line is in sub-frame, frame other interference of interior coupling are also taken frame out of, perhaps the E1 line interference and coupling that frame is outer arrives E1 line, the situation (see figure 3) that enters frame and sub-frame along cable.In two kinds of methods, the former cost is lower, but filter effect is relatively poor, and must consider the high pressure tolerance of electric capacity, and latter's cost is quite high.
For equipment with a large amount of 75 Europe coaxial line E1 interfaces, as SDH equipment, router device etc., a large amount of holding wires is as transmitting antenna and reception antenna, be to influence one of the electromagnetic interference of equipment and key factor of electromagnetic immunity performance, the electromagnetic compatibility problem that solves the E1 interface can play important effect to the raising of the Electro Magnetic Compatibility of equipment integral.
Summary of the invention
Technical problem to be solved by this invention provides a kind of E1 coaxial cable, the energy shield electromagnetic interference, effectively improve the E1 interface section of many E1 interface arrangement and the EMC performance of entire equipment, particularly only make a start ground connection and under the earth-free situation of receiving end of E1 interface.
In order to solve the problems of the technologies described above, the invention provides a kind of E1 coaxial cable, comprise insulating barrier and insulating barrier oversheath that coaxial outer layer signal reflux layer, this reflux layer are outer, it is characterized in that, in this insulating barrier oversheath, outside the insulating barrier of reflux layer, also comprise a metal screen layer.
Further, above-mentioned coaxial cable also can have following characteristics: described metal screen layer is wire sheathing or metal foil layer, perhaps both mixing.
Further, above-mentioned coaxial cable also can have following characteristics: described metal screen layer is made by nonmagnetic substance.
The method of shield electromagnetic interference when the another technical problem that the present invention will solve provides a kind of E1 coaxial cable of the present invention and is connected with the E1 interface, this method energy shield electromagnetic interference, effectively improve the E1 interface section of many E1 interface arrangement and the EMC performance of entire equipment, particularly only make a start ground connection and under the earth-free situation of receiving end of E1 interface.
In order to solve the problems of the technologies described above, the method of shield electromagnetic interference when the invention provides a kind of E1 coaxial cable of the present invention and being connected with the E1 interface, it is characterized in that, enter sub-frame place at described coaxial cable, enter the metal decking place of E1 veneer, metal screen layer 406 is electrically connected respectively with sub-frame metal chassis, the metal decking of ground connection.
Further, said method also can have following characteristics: or enter frame place, sub-frame place at described coaxial cable, enter the metal decking place of E1 veneer, metal screen layer 406 is electrically connected respectively with the frame metal chassis of ground connection, sub-frame metal chassis, metal decking.
Further, said method also can have following characteristics: at the cut cable that need be electrically connected with the metal decking of E1 veneer or sub-frame metal chassis or frame metal chassis, pull out the insulating barrier oversheath of described coaxial cable, expose described metal screen layer.
Further, said method also can have following characteristics: describedly electrically connect as metallic screw chucking or metallic conduction cloth is filled.
Further, said method also can have following characteristics: described metal decking and metal chassis are to be made or the all-metal coating surface by metal material.
Adopt E1 coaxial cable of the present invention and the method for shield electromagnetic interference when being connected, can solve the E1 interface single-end earthed the time, the EMC problem that receiving end can not ground connection causes with the E1 interface.Compare the present mode of passing through capacity earth or feed-through capacitor ground connection, the method that the present invention proposes has been emphasized the notion that the E1 interface cable should be considered as the part of equipment integral shielding more, implement simple, cost is low, more favourable to the limited equipment in space, be convenient to the improvement of traditional product simultaneously.
Description of drawings
Fig. 1 is 16 core coaxial cable schematic diagrames of tape insulation oversheath;
Fig. 2 is the 16 core coaxial cable schematic diagrames that increased screen;
Fig. 3 is the schematic diagram of the earth-free EMC interference path of receiving end;
Fig. 4 is the first embodiment of the invention structural representation;
Fig. 5 is the second embodiment of the invention structural representation.
Embodiment
It is tens up to a hundred that equipment need provide, even during the E1 interface of hundreds of, generally all several strands of coaxial lines (perhaps micro coaxle line) can be combined into coaxial cable.Fig. 1 is the existing 16 core coaxial cable schematic diagrames of tape insulation oversheath, and this coaxial cable comprises coaxial line core-wire layer 401, first insulating barrier 404, coaxial outer layer signal reflux layer 402, second insulating barrier 403 and insulating barrier oversheath 405 as shown in the figure.
The present invention has increased layer of metal screen 406 (hereinafter to be referred as screen 406) outside second insulating barrier 403 of each coaxial line in insulating barrier oversheath 405, it can be wire sheathing or metal foil layer, or both mixing.This layer that increases insulate on electric and between the signal reflux layer 402 of every coaxial line and opens, and plays screen at the aspect of performance of electromagnetic compatibility.And, this screen 406 can pass through metal structure ground connection in many places such as metal decking, sub-frame hardware, frame hardwares, thereby 405 pairs of successional destructions in metal earth shield interface of control cable second insulating barrier 403 and insulating barrier oversheath effectively, guarantee inside and outside the E1 panel of the board, inside and outside the sub-frame, effectively shielding isolation between the electromagnetic field inside and outside the frame.
The screen of this coaxial cable is to be made by nonmagnetic substances such as copper, aluminium, and the skin depth of thickness on the frequency of utilization.Therefore its shielding is not by screen mechanism such as the reflection of electromagnetic field, absorption to be produced, but because ground connection produces, so earthing mode can directly influence shield effectiveness.
For the screen 406 that makes increase plays good shield effectiveness, good earthing mode must be arranged, during by metal decking, metal sublayer frame or metal machine frame ground connection, screen 406 forms a continuous shield interface with the screen 406 that being electrically connected of above-mentioned hardware should be able to guarantee hardware and coaxial cable, and this shield interface will play the effect of isolation to the electromagnetic interference inside and outside the interface.
With two embodiment the method for using this cable shield electromagnetic interference is described below.
First embodiment
Fig. 4 has provided a kind of schematic diagram of execution mode.Step is as follows:
Step 410 before coaxial cable enters sub-frame, pulls out the insulating barrier oversheath 405 of this coaxial cable, exposes metal screen layer 406;
Step 420 is entered sub-frame place at coaxial cable, is entered the metal decking place of E1 veneer, and metal screen layer 406 is electrically connected respectively with sub-frame metal chassis, the metal decking of ground connection.As shown in Figure 4, be the interface with screen 406, sub-frame metal chassis, ground connection, can the separaant frame inside and outside electromagnetic field phase mutual interference; With E1 veneer metal decking, screen 406, ground connection is the interface, can isolate the inside and outside electromagnetic field phase mutual interference of E1 veneer metal decking.
Electrical connection can adopt the mode of metallic screw chucking, mode that metallic conduction cloth is filled or other to increase screen 406 and the method that metal structure reliably is connected area and is connected and fixed pressure, reduces screen 406 as far as possible and the contact resistance of the hardware that is electrically connected with it.
This mode is applied in has only sub-shelf structure but the situation of no frame structure.Need to prove, if it is panel of the board and sub-frame casing are not that metal material is made or all-metal coating, then inapplicable.
Second embodiment
Fig. 5 has provided the schematic diagram of another execution mode.Step before coaxial cable enters sub-frame is identical with first embodiment.
Enter frame place, sub-frame place at coaxial cable, enter the metal decking place of E1 veneer, metal screen layer 406 is electrically connected with the frame metal chassis of ground connection, sub-frame metal chassis, metal decking.As shown in Figure 5, be the interface with screen 406, frame metal chassis, ground connection, can isolate the inside and outside electromagnetic field phase mutual interference of frame; With screen, sub-frame metal chassis, ground connection is the interface, can the separaant frame inside and outside electromagnetic field phase mutual interference; With E1 veneer metal decking, screen 406, ground connection is the interface, can isolate the inside and outside electromagnetic field phase mutual interference of E1 veneer metal decking.
This mode is applied in one or more sub-shelf structures and is loaded on the interior situation of rack construction.Need to prove, if panel of the board, sub-frame casing, frame casing all do not make or all-metal coating for metal material, then inapplicable.
In addition, even E1 interface sending and receiving end is ground connection all, screen 406 can also be with electromagnetic-field-shielded the keeping apart in electromagnetic field in the sub-frame and the frame, prevent that the E1 line from advancing the interference and coupling in the external world in the frame and sub-frame in, prevent that simultaneously the E1 line from will go out outside the frame along the E1 tape in the sub-frame or after the interference and coupling in the frame, form conducted interference or form radiated interference in the space.
In sum, the present invention is with respect to the additive methods of various solution E1 interface EMC performances in the past, emphasize the notion that the E1 interface cable should be considered as the part of equipment integral shielding more, reached the layering multilayer screen isolation effect of equipment integral by screen 406 and hardware and the ground that increases.In addition, by design of structural size, coaxial cable of the present invention and traditional cable can have favorable compatibility and interchangeability.
Claims (8)
1, a kind of E1 coaxial cable comprises insulating barrier and insulating barrier oversheath that coaxial outer layer signal reflux layer, this reflux layer are outer, it is characterized in that, also comprises a metal screen layer in this insulating barrier oversheath, outside the insulating barrier of reflux layer.
2, coaxial cable as claimed in claim 1 is characterized in that, described metal screen layer is wire sheathing or metal foil layer, perhaps both mixing.
3, coaxial cable as claimed in claim 1 or 2 is characterized in that, described metal screen layer is made by nonmagnetic substance.
The method of shield electromagnetic interference when 4, the described coaxial cable of a kind of claim 1 is connected with the E1 interface, it is characterized in that, enter sub-frame place at described coaxial cable, enter the metal decking place of E1 veneer, metal screen layer 406 is electrically connected respectively with sub-frame metal chassis, the metal decking of ground connection.
5, method as claimed in claim 4, it is characterized in that, or enter frame place, sub-frame place at described coaxial cable, enter the metal decking place of E1 veneer, metal screen layer 406 is electrically connected respectively with the frame metal chassis of ground connection, sub-frame metal chassis, metal decking.
6, as claim 4 or 5 described methods, it is characterized in that, at the cut cable that need be electrically connected with the metal decking of E1 veneer or sub-frame metal chassis or frame metal chassis, pull out the insulating barrier oversheath of described coaxial cable, expose described metal screen layer.
7, as claim 4 or 5 described methods, it is characterized in that, describedly electrically connect as metallic screw chucking or metallic conduction cloth is filled.
As claim 4 or 5 described methods, it is characterized in that 8, described metal decking and metal chassis are to be made or the all-metal coating surface by metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100766444A CN100433200C (en) | 2006-04-27 | 2006-04-27 | E1 coaxial cable and method for shielding electromagnetic interference when connecting to E1 interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100766444A CN100433200C (en) | 2006-04-27 | 2006-04-27 | E1 coaxial cable and method for shielding electromagnetic interference when connecting to E1 interface |
Publications (2)
| Publication Number | Publication Date |
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| CN1838338A true CN1838338A (en) | 2006-09-27 |
| CN100433200C CN100433200C (en) | 2008-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100766444A Expired - Fee Related CN100433200C (en) | 2006-04-27 | 2006-04-27 | E1 coaxial cable and method for shielding electromagnetic interference when connecting to E1 interface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823146A (en) * | 2014-03-19 | 2014-05-28 | 国家电网公司 | E1 cable joint diagnosis device |
| CN105185466A (en) * | 2015-07-27 | 2015-12-23 | 立讯精密工业股份有限公司 | Coaxial cable |
| CN105742798A (en) * | 2016-02-25 | 2016-07-06 | 上海斐讯数据通信技术有限公司 | Device for protecting antenna trace signal and manufacturing method of device |
| CN108957820A (en) * | 2018-07-23 | 2018-12-07 | 山东超越数控电子股份有限公司 | A kind of low electromagnetic leakage liquid crystal display |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9301737L (en) * | 1993-05-19 | 1994-10-24 | Ericsson Telefon Ab L M | Grounding device for a bundle of shielded cables |
| JPH0850966A (en) * | 1994-08-04 | 1996-02-20 | Smk Corp | Coaxial connector for high-frequency wave |
| CN2390286Y (en) * | 1999-08-31 | 2000-08-02 | 富士康(昆山)电脑接插件有限公司 | Electric cable connector |
| JP2001307565A (en) * | 2000-04-19 | 2001-11-02 | Japan Aviation Electronics Industry Ltd | Coaxial cable |
| CN2469570Y (en) * | 2001-03-31 | 2002-01-02 | 深圳市利原宏实业发展有限公司 | Rapid convenient grounding device |
| CN2664126Y (en) * | 2003-11-27 | 2004-12-15 | 李基生 | A novel video transmission cable |
| CN2667619Y (en) * | 2004-01-20 | 2004-12-29 | 富港电子（东莞）有限公司 | Shielded cable |
-
2006
- 2006-04-27 CN CNB2006100766444A patent/CN100433200C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823146A (en) * | 2014-03-19 | 2014-05-28 | 国家电网公司 | E1 cable joint diagnosis device |
| CN105185466A (en) * | 2015-07-27 | 2015-12-23 | 立讯精密工业股份有限公司 | Coaxial cable |
| CN105742798A (en) * | 2016-02-25 | 2016-07-06 | 上海斐讯数据通信技术有限公司 | Device for protecting antenna trace signal and manufacturing method of device |
| CN108957820A (en) * | 2018-07-23 | 2018-12-07 | 山东超越数控电子股份有限公司 | A kind of low electromagnetic leakage liquid crystal display |
| CN108957820B (en) * | 2018-07-23 | 2020-12-18 | 山东超越数控电子股份有限公司 | Low-electromagnetic-leakage liquid crystal screen |
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| CN100433200C (en) | 2008-11-12 |
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