CN100563115C - Transfer impedance distribution cable - Google Patents
Transfer impedance distribution cable Download PDFInfo
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- CN100563115C CN100563115C CNB2004100486425A CN200410048642A CN100563115C CN 100563115 C CN100563115 C CN 100563115C CN B2004100486425 A CNB2004100486425 A CN B2004100486425A CN 200410048642 A CN200410048642 A CN 200410048642A CN 100563115 C CN100563115 C CN 100563115C
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- impedance
- port
- transfer
- distribution cable
- coaxial line
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Abstract
The present invention relates to the communications field, a kind of transfer impedance distribution cable is disclosed, make that characteristic impedance is that the twisted-pair feeder that 75 ohm coaxial line and characteristic impedance are 120 ohm is realized impedance matching, thereby solve the resistance matching problem of little base station when using abroad, and easy for installation, good looking appearance, cost is lower, barrier propterty good.The PCB that this transfer impedance distribution cable adopts plastic package process will comprise impedance transformer embeds in the cable, adds lightning protection component in addition therein.
Description
Technical field
The present invention relates to the communications field, particularly the base station transmits technology in the mobile communication system.
Background technology
Global system for mobile communications (Global System for mobile Communication, be called for short " GSM ") be the standard of the most representative and comparative maturity in the second generation digital cellular mobile communication systems, it has, and capacity is big, the availability of frequency spectrum is high, good communication quality, class of business are many, be easy to maintain secrecy, the advantages such as network configuration of subscriber equipment small volume and less weight, opening.The various interface rules of gsm system are clear and definite, both be convenient to realize interconnected between each communication common carrier mobile device, be convenient to gsm system and integrated services digital network (Integrated ServicesDigital Network again, be called for short " ISDN ") and the intercommunication of public switched telephone network communication networks such as (Public Switched Telephone Network, abbreviations " PSTN ").Gsm system has become the main body of China's digital mobile cellular telecommunication network at present.
Gsm system is by mobile services switching centre (Mobile services Switching Center, abbreviation " MSC "), attaching position register (Home Location Register, abbreviation " HLR "), calling party location register (Visit Location Register, abbreviation " VLR "), entities such as base station controller (BaseStation Controller is called for short " BSC ") and base station constitute.Wherein, BSC and MSC are installed in Centroid.At home, service in base station is sent to Centroid by E1 interface transmission network.The E1 interface is one of two kinds of interfaces that network provided that adopt SDH (Synchronous Digital Hierarchy) (Synchronous Optical Network is called for short " SDH ") technology, and the bandwidth of 2M can be provided.
At home, all to be to use characteristic impedance usually be 75 ohm coaxial line to the E1 interface cable.Yet what many countries used on the overseas market is that characteristic impedance is 120 ohm a twisted-pair feeder.For realizing that domestic base station uses in overseas, must increase the impedance matching unit on the transmission line, make that the transmission on the E1 interface realizes impedance matching.In a transmission system, if impedance does not match, then produce reflected wave, make the recipient can't obtain maximum energy.For characteristic impedance is 75 ohm coaxial line, realize impedance matching, and just needing load impedance is 75 ohm, otherwise will inevitably produce reflected wave.If the numerical value of the characteristic impedance of the numerical value of load impedance and coaxial line is unequal, just need to adopt the way of impedance conversion.
In the prior art, usually adopt the impedance conversion box to solve the problems referred to above, promptly characteristic impedance be 75 ohm coaxial line and characteristic impedance be 120 ohm twisted-pair feeder between polyphone connect the impedance conversion box, make load impedance equate with the characteristic impedance of transmission line.
In actual applications, there is following problem in such scheme: use usually in the open air little base station, and the impedance conversion box body is long-pending bigger, makes inconvenience when installing in the open air; Sealing is not high, fails effective waterproof and dustproof, mildew-resistant and protection from fumes; Lightning protection properties is relatively poor; Cost is higher, and opening period is long.
Cause the main cause of this situation to be, existing impedance conversion box body is long-pending greatly, profile is coarse and crude, sealing is poor, barrier propterty is not high and complex structure.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transfer impedance distribution cable, make that characteristic impedance is that the twisted-pair feeder that 75 ohm coaxial line and characteristic impedance are 120 ohm is realized impedance matching better, thereby solve the resistance matching problem of little base station when using abroad, and easy for installation, good looking appearance, cost is lower, barrier propterty good.
For achieving the above object, the invention provides a kind of transfer impedance distribution cable, comprise and be encapsulated in coaxial line, twisted-pair feeder and a transfer impedance converter plate in the cable, wherein,
One end of described coaxial line docks with the coaxial line that needs to realize impedance matching;
One end of described twisted-pair feeder docks with the twisted-pair feeder that needs to realize impedance matching;
Described transfer impedance converter plate comprises impedance transformer, is used for first gas discharge tube of differential-mode current bleed off, and second gas discharge tube that is used for the common mode current bleed off, and described impedance transformer is used to realize impedance conversion;
One end of described transfer impedance converter plate comprises first and five-port of described impedance transformer, and the other end of described transfer impedance converter plate comprises the second and the 6th port of described impedance transformer;
Described twisted-pair feeder by described first and five-port insert described transfer impedance converter plate, described coaxial line inserts described transfer impedance converter plate by the described second and the 6th port;
Impedance and coil turn between the port of described impedance transformer satisfy R
2-6/ R
1-5=(N
2-6/ N
1-5)
2, described first and five-port between impedance be R
1-5, the number of turn is N
1-5, the impedance between the described second and the 6th port is R
2-6, the number of turn is N
2-6
Described first is connected by described first gas discharge tube with five-port, and the described the 5th is connected by described second gas discharge tube with the 6th port.
The 6th port of described impedance transformer is connected with the metal-shielded wire of described coaxial line.
The characteristic impedance of described coaxial line is 75 ohm, and the characteristic impedance of described twisted-pair feeder is 120 ohm.
Described impedance transformer first, the 3rd and the five-port number of turn and second, the 4th and the 6th end turn number between ratio be 1.26: 1.
Described transfer impedance converter plate realizes by a single printed circuit board (PCB), and adopts plastic packaging mode and described coaxial line and twisted-pair feeder to be packaged together.
The discharge voltage of described first and second gas discharge tubes is 90 volts, and error is ± 20%.
Described transfer impedance distribution cable is used for the E1 connection of base station to other communication equipments.
By relatively finding, technical scheme difference with the prior art of the present invention is, the printed circuit board (PCB) (Print Circuit Board is called for short " PCB ") that adopts plastic package process will comprise impedance transformer embeds in the cable, adds lightning protection component in addition therein.
Difference on this technical scheme, bring comparatively significantly beneficial effect, promptly when realizing impedance matching, also improved the protective of product, make its can lightning protection, waterproof, mildew-resistant, dustproof, protection from fumes, and simple installation, good looking appearance, cost is low, the construction cycle is short.
Description of drawings
Fig. 1 is the circuit theory diagrams of employed transfer impedance converter plate in the transfer impedance distribution cable of one embodiment of the present of invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, the present invention is that 120 ohm E1 transmission line designs in order to make domestic little base station can adapt to external characteristic impedance, is used for docking of the 75 ohm of E1 lines in the little base station of BTS3001C and external 120 ohm of E1 lines.The present invention is designed to the cable profile, and length is 3 meters, is made up of the transfer impedance converter plate (Transmission ImpedanceTransforming Board is called for short " TITB ") of one section coaxial line, one section twisted-pair feeder and one section plastic packaging.Because the present invention is designed to a kind of cable, install simple and convenient, consistent with the installation method of common cable.
Wherein, the coaxial line characteristic impedance among the present invention is 75 ohm, and length is 0.5 meter, is used to connect one section coaxial line that needs are realized impedance matching.Twisted-pair feeder characteristic impedance among the present invention is 120 ohm, and length is 2.5 meters, is used to connect one section twisted-pair feeder that needs are realized impedance matching.The TITB of plastic packaging is used to realize impedance conversion, makes 75 ohm coaxial line and 120 ohm twisted-pair feeder realize impedance matching; It also adds lightning protection function simultaneously, can bear the 8/20us impulse current, is not damaged under the situation of differential mode 5KA/ common mode 10KA; And the plastic package process that it adopts also efficiently solves waterproof and dustproof, mildew-resistant and fume-proof problem.
Further specify the 26S Proteasome Structure and Function of the TITB of plastic packaging among the present invention below in conjunction with accompanying drawing 1.
As shown in Figure 1, the TITB of plastic packaging comprises impedance transformer 10, gas discharge tube 20 and gas discharge tube 21.Wherein the 1st port of impedance transformer 10 links to each other by gas discharge tube 20 with the 5th port, and the 5th port links to each other by gas discharge tube 21 with the 6th port.Characteristic impedance is 1st port and the 5th port accesses of 120 ohm of twisted-pair feeders by impedance transformer 10, and characteristic impedance is that 75 ohm coaxial line is by the access of the 2nd port and the 6th port, what deserves to be explained is that wherein the 6th port is to link to each other with the metal-shielded wire of coaxial line.
The following describes the model and the effect of each device of the TITB that forms plastic packaging:
Impedance transformer 10 is used to realize impedance conversion, and impedance transformer 10 used in the present invention adopts the transformer of PE-65389 signal, and the number of turn of the 1st port to the 5 ports is made as N
1-5, the number of turn of the 2nd port to the 6 ports is made as N
2-6, the turn ratio between them is N
1-5: N
2-6=1.26: 1; (2-6) dielectric strength of TO (1-5) is 1500V, 1mA, 1min or 1650V, 6S.Those of ordinary skill in the art are appreciated that and adopt the impedance transformer that function is suitable, model is different, do not influence the spirit and scope of the invention.
The TITB that further specifies plastic packaging below realizes the principle of impedance conversion and lightning protection:
The 1st port and the impedance between the 5th port of assumed resistance converter 10 are R
1-5, the impedance between the 2nd port and the 6th port is R
2-6Because R
2-6/ R
1-5=(N
2-6/ N
1-5)
2, and turn ratio N
1-5: N
2-6=1.26: 1, so R
2-6=R
1-5* (N
2-6/ N
1-5)
2=120 * (1/1.26)
2=75 ohm, promptly realized impedance conversion.
On lightning protection properties, because impedance transformer 10 dielectric strengths are 1500V, thereby the employing puncture voltage is that 90V, bleed off electric current get final product for the 10KA air discharge tube carries out the cascading water protection.In the present invention, gas discharge tube 20 is used for the differential-mode current bleed off; Gas discharge tube 21 is used for the common mode current bleed off, on the metal-shielded wire of common mode current bleed off to 75 ohm E1 coaxial line, it by ground connection on the little base station lightning protection circuit after further bleed off to ground.Therefore the lightning protection index is difference common mode 10KA (8/20us).
The TITB of above-mentioned plastic packaging goes up at a single printed circuit board (PCB) (Print Circuit Board is called for short " PCB ") to realize.As a preferred embodiment of the present invention, the cabling thickness of this pcb board is 5OZ, and trace width is 80mil, the effective colored pad of atmospherical discharges, and the PCB material can be selected general FR4 sheet material for use, and hot blast flattening process, board dimension 60 * 20 * 2mm are adopted in the surface.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (7)
1. a transfer impedance distribution cable is characterized in that, comprise to be encapsulated in coaxial line, twisted-pair feeder and a transfer impedance converter plate in the cable, wherein,
One end of described coaxial line docks with the coaxial line that needs to realize impedance matching;
One end of described twisted-pair feeder docks with the twisted-pair feeder that needs to realize impedance matching;
Described transfer impedance converter plate comprises impedance transformer, is used for first gas discharge tube of differential-mode current bleed off, and second gas discharge tube that is used for the common mode current bleed off, and described impedance transformer is used to realize impedance conversion;
One end of described transfer impedance converter plate comprises first and five-port of described impedance transformer, and the other end of described transfer impedance converter plate comprises the second and the 6th port of described impedance transformer;
Described twisted-pair feeder by described first and five-port insert described transfer impedance converter plate, described coaxial line inserts described transfer impedance converter plate by the described second and the 6th port;
Impedance and coil turn between the port of described impedance transformer satisfy R
2-6/ R
1-5=(N
2-6/ N
1-5)
2, described first and five-port between impedance be R
1-5, the number of turn is N
1-5, the impedance between the described second and the 6th port is R
2-6, the number of turn is N
2-6
Described first is connected by described first gas discharge tube with five-port, and the described the 5th is connected by described second gas discharge tube with the 6th port.
2. transfer impedance distribution cable according to claim 1 is characterized in that the 6th port of described impedance transformer is connected with the metal-shielded wire of described coaxial line.
3. transfer impedance distribution cable according to claim 1 is characterized in that the characteristic impedance of described coaxial line is 75 ohm, and the characteristic impedance of described twisted-pair feeder is 120 ohm.
4. transfer impedance distribution cable according to claim 3 is characterized in that, described impedance transformer first, the 3rd and the five-port number of turn and second, the 4th and the 6th end turn number between ratio be 1.26: 1.
5. transfer impedance distribution cable according to claim 1 is characterized in that, described transfer impedance converter plate realizes by a single printed circuit board (PCB), and adopts plastic packaging mode and described coaxial line and twisted-pair feeder to be packaged together.
6. transfer impedance distribution cable according to claim 1 is characterized in that the discharge voltage of described first and second gas discharge tubes is 90 volts, and error is ± 20%.
7. transfer impedance distribution cable according to claim 1 is characterized in that, described transfer impedance distribution cable is used for the E1 connection of base station to other communication equipments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100486425A CN100563115C (en) | 2004-06-08 | 2004-06-08 | Transfer impedance distribution cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100486425A CN100563115C (en) | 2004-06-08 | 2004-06-08 | Transfer impedance distribution cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1707968A CN1707968A (en) | 2005-12-14 |
| CN100563115C true CN100563115C (en) | 2009-11-25 |
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ID=35581650
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100486425A Expired - Fee Related CN100563115C (en) | 2004-06-08 | 2004-06-08 | Transfer impedance distribution cable |
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| Country | Link |
|---|---|
| CN (1) | CN100563115C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012162999A1 (en) * | 2011-10-11 | 2012-12-06 | 华为技术有限公司 | E1 signal transmission line, e1 signal sending device and receiving device |
| CN105786739A (en) * | 2014-12-25 | 2016-07-20 | 中兴通讯股份有限公司 | Clock reference conversion method and apparatus, and cable |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867072A (en) * | 1997-07-29 | 1999-02-02 | Merrimac Industries, Inc. | Biphase modulator with balun design |
| CN2387651Y (en) * | 1999-07-29 | 2000-07-12 | 陈晓宁 | Isolating distributing frame protector |
| CN1310881A (en) * | 1998-07-23 | 2001-08-29 | A.C.&.E.控股公司 | Balun and associated method for connecting cables |
| CN2540705Y (en) * | 2002-06-03 | 2003-03-19 | 成都天缘信息产业发展有限公司 | 75 ohm coaxiale cable transceiver |
-
2004
- 2004-06-08 CN CNB2004100486425A patent/CN100563115C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867072A (en) * | 1997-07-29 | 1999-02-02 | Merrimac Industries, Inc. | Biphase modulator with balun design |
| CN1310881A (en) * | 1998-07-23 | 2001-08-29 | A.C.&.E.控股公司 | Balun and associated method for connecting cables |
| CN2387651Y (en) * | 1999-07-29 | 2000-07-12 | 陈晓宁 | Isolating distributing frame protector |
| CN2540705Y (en) * | 2002-06-03 | 2003-03-19 | 成都天缘信息产业发展有限公司 | 75 ohm coaxiale cable transceiver |
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| Publication number | Publication date |
|---|---|
| CN1707968A (en) | 2005-12-14 |
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