CN103199391B - Connecting box of communication collecting equipment - Google Patents
Connecting box of communication collecting equipment Download PDFInfo
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- CN103199391B CN103199391B CN201310095749.4A CN201310095749A CN103199391B CN 103199391 B CN103199391 B CN 103199391B CN 201310095749 A CN201310095749 A CN 201310095749A CN 103199391 B CN103199391 B CN 103199391B
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- 230000009466 transformation Effects 0.000 abstract description 21
- 238000012423 maintenance Methods 0.000 abstract description 4
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- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The invention discloses a connecting box of communication collecting equipment. The connecting box of the communication collecting equipment comprises a first dial switch circuit, a high-impedance insulation circuit, a second dial switch circuit, a impedance switching circuit, a third dial switch circuit, a first port and a second port, wherein the first port is used for accessing a partial link, and the second port is used for accessing the collecting equipment. Flexible switching of different application occasions such as direction connection, impedance transformation, high-impedance insulation, and the impedance transformation and the high-impedance insulation through switching of the first dial switch circuit, the second dial switch circuit and the third dial switch circuit. The connecting box of the communication collecting equipment is simple in structure, simplifies steps for lapping engineering collecting environment, is high in compatibility, overall in function, and suitable for all kinds of application occasions, greatly improves efficiency of engineering maintenance, and can be widely applied to the technical field of communications.
Description
Technical field
The present invention relates to communication technical field, especially a kind of terminal box of the collecting device that communicates.
Background technology
Communication collecting device refers to the equipment for the signaling in collection communication link, voice or data, and it needs when gathering to be linked in office side's link (as mobile backbone link), therefore may affect the normal operation of office side's link.For E1 signal, the physical interface of office side's link mainly contains CC4 interface, RJ48 interface and RJ45 interface, but RJ48 interface, RJ45 interface and CC4 interface can not meet the requirement that Large Copacity gathers.Therefore, communication collecting device can adopt the DB68 interface that density is high, volume is little to catch E1 signal usually, at this moment just needs to use patch panels.The effect of patch panels is exactly the physical interface of realization office side link and the mutual conversion of collecting device interface.Patch panels is when carrying out interface conversion, if impedance mismatch, will add impedance inverter circuit.
Catch except needs patch panels to E1 signal, also need to use high resistant head.The effect of high resistant head be in order to realize high-barrier from, when not affecting office side E1 signal normal transmission, by the mode of coupling E1 signals collecting being got off and being supplied to communication collecting device.
At present, for the communication collecting device of E1 signal, generally need to make high resistant head and manual overlap joint collection environment by hand: for office side's link, if CC4 joint, just need the patch panels used for CC4 interface; If RJ48 joint or RJ45 joint, just need the patch panels used for RJ48 interface or RJ45 interface.The step of its engineering overlap joint is more complicated, is unfavorable for on-the-spot maintenance.And, its most function singleness, can not meet straight-through, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. different application scene carry out the requirement that switches.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: provide a kind of structure simple, the compatible high terminal box with the collecting device that communicates of complete function.
The technical scheme that technical solution problem of the present invention adopts is: a kind of terminal box of the collecting device that communicates, comprise the first toggle switch circuit, high resistant buffer circuit, second toggle switch circuit, impedance inverter circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
Further, described high resistant buffer circuit comprises the first resistance, the second resistance and the first transformer, described first transformer comprises primary coil, iron core and secondary coil, one end of described first resistance and one end of the second resistance are all connected with the second output of described first toggle switch circuit, the other end of described first resistance is by primary coil and then be connected with the other end of the second resistance, and the output of described secondary coil is connected with the second input of the second toggle switch circuit.
Further, described impedance inverter circuit comprises the second transformer, and the second output of described second toggle switch circuit is by the second transformer and then be connected with the second input of the 3rd toggle switch circuit.
Further, described first toggle switch circuit comprises the first toggle switch and the second toggle switch, the input of described first toggle switch is all connected with the output of first interface with the input of the second toggle switch, first output of described first toggle switch is all connected with the first input end of the second toggle switch circuit with the first output of the second toggle switch, and the second output of described first toggle switch is all connected with the input of high resistant buffer circuit with the second output of the second toggle switch.
Further, described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the first toggle switch with the first input end of the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the second toggle switch with the first input end of the 4th toggle switch, second input of described 3rd toggle switch is all connected with the output of high resistant buffer circuit with the second input of the 4th toggle switch, first output of described 3rd toggle switch is all connected with the first input end of the 3rd toggle switch circuit with the first output of the 4th toggle switch, second output of described 3rd toggle switch is all connected with the input of impedance inverter circuit with the second output of the 4th toggle switch.
Further, described 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 3rd toggle switch with the first input end of the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 4th toggle switch with the first input end of the 6th toggle switch, second input of described 5th toggle switch is all connected with the output of impedance inverter circuit with the second input of the 6th toggle switch, the output of described 5th toggle switch is all connected with the input of the second interface with the output of the 6th toggle switch.
Further, described first interface is any one in CC4 interface, RJ48 interface and RJ45 interface, and described second interface is DB68 interface.
Further, described first resistance and the second resistance are the resistance of 680 ohm.
Further, the order of described impedance inverter circuit and high resistant buffer circuit is interchangeable.
Its technical solution problem of the present invention adopt another technical scheme be: a kind of terminal box of the collecting device that communicates, comprise the first toggle switch circuit, impedance inverter circuit, second toggle switch circuit, high resistant buffer circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
The invention has the beneficial effects as follows: comprise the first toggle switch circuit, high resistant buffer circuit, the second toggle switch circuit, impedance inverter circuit, the 3rd toggle switch circuit, switching by first, second, and third toggle switch circuit realizes leading directly to, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. the flexible switching of different application scene, structure is simple, simplify the step that engineering overlap joint gathers environment, compatible high, complete function, be applicable to various application scenarios, drastically increase the efficiency of engineering maintenance.
Another beneficial effect of the present invention is: comprise the first toggle switch circuit, impedance inverter circuit, the second toggle switch circuit, high resistant buffer circuit, the 3rd toggle switch circuit, switching by first, second, and third toggle switch circuit realizes leading directly to, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. the flexible switching of different application scene, structure is simple, simplify the step that engineering overlap joint gathers environment, compatible high, complete function, be applicable to various application scenarios, drastically increase the efficiency of engineering maintenance.
Accompanying drawing explanation
Below in conjunction with Figure of description and embodiment, the invention will be further described.
Fig. 1 is the First Principle block diagram of the terminal box of a kind of collecting device that communicates of the present invention;
Fig. 2 is the circuit theory diagrams of high resistant buffer circuit of the present invention;
Fig. 3 is the structured flowchart of impedance inverter circuit of the present invention;
Fig. 4 is the structured flowchart of the present invention first, second, and third toggle switch circuit;
Fig. 5 is the annexation figure of the present invention the 5th toggle switch and the 6th toggle switch;
Fig. 6 is the second theory diagram of the terminal box of a kind of collecting device that communicates of the present invention.
Reference numeral: 1 ~ 8, each segment data circulation link; 9, primary coil; 10, secondary coil; R1, the first resistance; R2, the second resistance; T1, iron core; 11 ~ 18, the pin of upper toggle switch; 21 ~ 28, the pin of lower toggle switch; The forward output of DB68_0_+, DB68 interface; The inverse output terminal of DB68_0_-, DB68 interface; The forward output of RJ48_0_+, RJ48 interface; The inverse output terminal of RJ48_0_-, RJ48 interface.
Embodiment
With reference to Fig. 1, a kind of terminal box of the collecting device that communicates, comprise the first toggle switch circuit, high resistant buffer circuit, second toggle switch circuit, impedance inverter circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
Wherein, first interface is the input interface of terminal box, for accessing office side's link, thus from the data that link input in office side's will gather;
High resistant buffer circuit, for office side's link and collecting device being kept apart, thus reduces the impact of the collecting device side of playing a game Link State;
Impedance inverter circuit, for carrying out impedance transformation, thus makes the impedance matching of office side's link and collecting device;
First toggle switch circuit, the second toggle switch circuit and the 3rd toggle switch circuit then jointly realize straight-through, impedance transformation add high-barrier from high-barrier from etc. the flexible switching of different application scene;
Second interface is the output interface of terminal box, for accessing collecting device, thus exports the data after terminal box to collecting device.
When on distributing frame, overlap joint communication gathers environment, the interface (the second interface) needing the physical interface (first interface) that adopts according to office side's link and collecting device to adopt and adopt different signals collecting modes: if first interface is CC4 interface, and the collecting device impedance that communicates is 120 ohm, then impedance is needed to change rotating function; If first interface is RJ48 or RJ45 interface, and the collecting device impedance that communicates is 75 ohm, now also need impedance transformation function; If first interface and the impedance matching of the collecting device that communicates, then only need use high resistant buffer circuit and coordinate patch panels the two to be connected.
As shown in Figure 1, the present invention only needs can realize by the switching of first, second, and third toggle switch circuit the conversion that different pieces of information flows to scene (different application scene).What first, second, and third toggle switch circuit mainly changed when switching is the break-make of 1 ~ 8 this eight segment datas link.And the present invention can realize following four kinds of patterns by the switching of toggle switch circuit:
(1) direct mode operation, data flow is 1->2->3->4;
(2) high resistant isolation mode, data flow is 1->5->6->3-Gre atT.GreaT.GT4;
(3) impedance transformation pattern, data flow is 1->2->7->8-Gre atT.GreaT.GT4;
(4) high-barrier is from adding impedance transformation pattern, and data flow is 1->5->6->7-Gre atT.GreaT.GT8->4.
The present invention does not need when engineering overlaps to make separately high resistant head again, do not need yet office side's link with communicate collecting device impedance mismatch time change patch panels, only need to arrange toggle switch circuit when application scenarios is different, the workload of the project implementation can be reduced, reduce due to the project process brought of constructing.
With reference to Fig. 2, be further used as preferred embodiment, described high resistant buffer circuit comprises the first resistance R1, the second resistance R2 and the first transformer, described first transformer comprises primary coil 9, iron core T1 and secondary coil 10, one end of described first resistance R1 is all connected with the second output of described first toggle switch circuit with one end of the second resistance R2, the other end of described first resistance R1 is by primary coil 9 and then be connected with the other end of the second resistance R2, and the output of described secondary coil 10 is connected with the second input of the second toggle switch circuit.
Wherein, high resistant buffer circuit carries out input and output by differential lines.As shown in Figure 2, the forward pin of the second output of the first toggle switch circuit is by R1 and then be connected with the first pin of primary coil 9, and the reverse pin of the second output of the first toggle switch circuit is by R2 and then be connected with the second pin of primary coil 9; And the first pin of secondary coil 10 is connected with the forward pin of the second input of the second toggle switch circuit, the second pin of secondary coil 10 is connected with the reverse pin of the second input of the second toggle switch circuit.R1 and R2 is high resistance measurement, and the first transformer is turn ratio is the transformer of 1:1.15.By resistance R1 and R2 the signal that source (one end at the first transformer place) sends over can be carried out high-barrier from, and be connected to end (one end at the first transformer secondary coil place) by the first transformer.The object of high resistant buffer circuit is in order to collecting source signal while, reduces the impact on source signal source.
With reference to Fig. 3, be further used as preferred embodiment, described impedance inverter circuit comprises the second transformer, and the second output of described second toggle switch circuit is by the second transformer and then be connected with the second input of the 3rd toggle switch circuit.
Wherein, impedance inverter circuit also carries out input and output by differential lines.When specific implementation is of the present invention, second transformer is the same with the first transformer also can be divided into primary coil, iron core and secondary coil, first pin of primary coil is connected with the forward pin of the second output of the second toggle switch circuit, and the second pin of primary coil is connected with the reverse pin of the second output of the second toggle switch circuit; And the first pin of secondary coil is connected with the forward pin of the 3rd toggle switch circuit input end, the second pin of secondary coil is connected with the reverse pin of the 3rd input of the second toggle switch circuit.If the number of turn of primary coil is N1 and Z1, the number of turn of secondary coil is N2 and Z2, then have: Z1/Z2=(N1/N2) ^2, i.e. the ratio of impedance equal coil ratio square.
Such as the second transformer needs the impedance transformation realizing 75 to 120 ohm, now according to above-mentioned formula, works as Z1=75, Z2=120, and turn ratio N=1.26 can meet the requirement of impedance transformation.Adopt the second transformer to realize impedance transformation, compared with other implementations, more simply, facilitate and be easy to realize.
With reference to Fig. 4, be further used as preferred embodiment, described first toggle switch circuit comprises the first toggle switch and the second toggle switch, the input of described first toggle switch is all connected with the output of first interface with the input of the second toggle switch, first output of described first toggle switch is all connected with the first input end of the second toggle switch circuit with the first output of the second toggle switch, and the second output of described first toggle switch is all connected with the input of high resistant buffer circuit with the second output of the second toggle switch.
With reference to Fig. 4, be further used as preferred embodiment, described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the first toggle switch with the first input end of the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the second toggle switch with the first input end of the 4th toggle switch, second input of described 3rd toggle switch is all connected with the output of high resistant buffer circuit with the second input of the 4th toggle switch, first output of described 3rd toggle switch is all connected with the first input end of the 3rd toggle switch circuit with the first output of the 4th toggle switch, second output of described 3rd toggle switch is all connected with the input of impedance inverter circuit with the second output of the 4th toggle switch.
With reference to Fig. 4, be further used as preferred embodiment, described 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 3rd toggle switch with the first input end of the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 4th toggle switch with the first input end of the 6th toggle switch, second input of described 5th toggle switch is all connected with the output of impedance inverter circuit with the second input of the 6th toggle switch, the output of described 5th toggle switch is all connected with the input of the second interface with the output of the 6th toggle switch.
Wherein, the function of the first to the 6th toggle switch is all identical, is all used to operate the address switch controlled, and is namely all the microswitches can stirred with hand, and the present invention's employing is binary states toggle switch (comprising " ON " and " OFF " two states).As shown in Figure 5, the input pin that 11,12,13 and 14 pin (or 21,22,23 and 24 pin) are toggle switch, the output pin that 15,16,17 and 18 pin (or 25,26,27 and 28 pin) are toggle switch.In the present invention, the first toggle switch circuit be made up of the first to the 6th toggle switch, the second toggle switch circuit and the 3rd toggle switch circuit all adopt differential lines to carry out input and output.3rd toggle switch circuit is example below, is further elaborated the principle of toggle switch circuit of the present invention.
With reference to Fig. 5, the 3rd toggle switch circuit is made up of upper and lower two toggle switchs, and upper toggle switch is forward input and output, and lower toggle switch is reverse input and output.Wherein, 2 pin of upper and lower two toggle switch inputs and 4 pin (i.e. 12 in figure and 14 pin or 22 and 24 pin) link together, and 5 pin of output, 6 pin and 7 pin (i.e. 15 in figure, 16 and 17 pin or 25,26 and 27 pin) link together.And output is except receiving DB68 interface (DB68_0_+ and DB68_0_-) of the present invention, RJ48 interface (RJ48_0_+ and RJ48_0_-) also can be received, to meet the different needs:
If a () will realize signal straight-through (CC4 interface direct attaches to DB68 interface), then only need 1 pin (i.e. 11 in figure and 21 pin) of upper and lower toggle switch all to dial as ON state, other pin are dialled as OFF state;
If b () will realize impedance transformation (CC4 interface receives RJ48 interface after impedance transformation), then only needing 2 pin of upper and lower toggle switch and 4 pin (i.e. 12 in figure and 14 pin and 22 and 24 pin) to dial is ON state, and other pin are dialled as OFF state;
If c () will realize impedance transformation and high-barrier from (RJ48 interface is to DB68 interface) simultaneously, then only need 3 pin (i.e. 13 in figure and 23 pin) of upper and lower toggle switch to be set to ON state, other pin are dialled as OFF state.
Be more than certain applications scene, if need to realize the application of other different scenes, also need to carry out suitable combination to toggle switch circuit, impedance inverter circuit and high resistant buffer circuit.
Be further used as preferred embodiment, described first interface is any one in CC4 interface, RJ48 interface and RJ45 interface, and described second interface is DB68 interface.
Be further used as preferred embodiment, described first resistance R1 and the second resistance R2 is the resistance of 680 ohm.
680 ohm enough large with 120 ohm of RJ48 interface relative to 75 ohm of DB68 interface, can office side's link and collecting device be kept apart well.
Be further used as preferred embodiment, the order of described impedance inverter circuit and high resistant buffer circuit is interchangeable.
With reference to Fig. 6, the terminal box of a kind of collecting device that communicates of the present invention, comprise the first toggle switch circuit, impedance inverter circuit, second toggle switch circuit, high resistant buffer circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
Compared with the scheme of Fig. 1, the scheme difference that Fig. 6 adopts only is, the location swap of impedance inverter circuit and these two circuit of high resistant buffer circuit.Correspondingly, the present invention can realize following four kinds of patterns by the switching of toggle switch circuit:
(1) direct mode operation, data flow is 1->2->3->4;
(2) high resistant isolation mode, data flow is 1->2->7->8-Gre atT.GreaT.GT4;
(3) impedance transformation pattern, data flow is 1->5->6->3-Gre atT.GreaT.GT4;
(4) high-barrier is from adding impedance transformation pattern, and data flow is 1->5->6->7-Gre atT.GreaT.GT8->4.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (9)
1. the terminal box of the collecting device that communicates, it is characterized in that: comprise the first toggle switch circuit, high resistant buffer circuit, second toggle switch circuit, impedance inverter circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
2. the terminal box of a kind of collecting device that communicates according to claim 1, it is characterized in that: described high resistant buffer circuit comprises the first resistance (R1), second resistance (R2) and the first transformer, described first transformer comprises primary coil (9), iron core (T1) and secondary coil (10), one end of described first resistance (R1) is all connected with the second output of described first toggle switch circuit with one end of the second resistance (R2), the other end of described first resistance (R1) is by primary coil (9) and then be connected with the other end of the second resistance (R2), the output of described secondary coil (10) is connected with the second input of the second toggle switch circuit.
3. the terminal box of a kind of collecting device that communicates according to claim 2, is characterized in that:
Described impedance inverter circuit comprises the second transformer, and the second output of described second toggle switch circuit is by the second transformer and then be connected with the second input of the 3rd toggle switch circuit.
4. the terminal box of a kind of collecting device that communicates according to claim 1, it is characterized in that: described first toggle switch circuit comprises the first toggle switch and the second toggle switch, the input of described first toggle switch is all connected with the output of first interface with the input of the second toggle switch, first output of described first toggle switch is all connected with the first input end of the second toggle switch circuit with the first output of the second toggle switch, second output of described first toggle switch is all connected with the input of high resistant buffer circuit with the second output of the second toggle switch.
5. the terminal box of a kind of collecting device that communicates according to claim 4, it is characterized in that: described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the first toggle switch with the first input end of the 4th toggle switch, the first input end of described 3rd toggle switch is all connected with the first output of the second toggle switch with the first input end of the 4th toggle switch, second input of described 3rd toggle switch is all connected with the output of high resistant buffer circuit with the second input of the 4th toggle switch, first output of described 3rd toggle switch is all connected with the first input end of the 3rd toggle switch circuit with the first output of the 4th toggle switch, second output of described 3rd toggle switch is all connected with the input of impedance inverter circuit with the second output of the 4th toggle switch.
6. the terminal box of a kind of collecting device that communicates according to claim 5, it is characterized in that: described 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 3rd toggle switch with the first input end of the 6th toggle switch, the first input end of described 5th toggle switch is all connected with the first output of the 4th toggle switch with the first input end of the 6th toggle switch, second input of described 5th toggle switch is all connected with the output of impedance inverter circuit with the second input of the 6th toggle switch, the output of described 5th toggle switch is all connected with the input of the second interface with the output of the 6th toggle switch.
7. the terminal box of a kind of collecting device that communicates according to any one of claim 1-6, is characterized in that: described first interface is any one in CC4 interface, RJ48 interface and RJ45 interface, and described second interface is DB68 interface.
8. the terminal box of a kind of collecting device that communicates according to claim 2, is characterized in that: described first resistance (R1) and the second resistance (R2) are the resistance of 680 ohm.
9. the terminal box of the collecting device that communicates, it is characterized in that: comprise the first toggle switch circuit, impedance inverter circuit, second toggle switch circuit, high resistant buffer circuit, 3rd toggle switch circuit, for accessing the first interface of office side's link and the second interface for accessing collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of described first toggle switch circuit is by impedance inverter circuit and then be connected with the second input of the second toggle switch circuit, first output of described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of described second toggle switch circuit is by high resistant buffer circuit and then be connected with the second input of the 3rd toggle switch circuit, the output of described 3rd toggle switch circuit is connected with the input of the second interface.
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| CN201310095749.4A CN103199391B (en) | 2013-03-22 | 2013-03-22 | Connecting box of communication collecting equipment |
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| CN201310095749.4A CN103199391B (en) | 2013-03-22 | 2013-03-22 | Connecting box of communication collecting equipment |
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| CN103199391B true CN103199391B (en) | 2015-07-08 |
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| CN1538646A (en) * | 2003-10-24 | 2004-10-20 | 中兴通讯股份有限公司 | High impedance isolation device in signalling monitoring system |
| CN201499140U (en) * | 2009-09-02 | 2010-06-02 | 南京普天网络有限公司 | Integrated impedance transducer for 2M interface impedance conversion |
| CN201509189U (en) * | 2009-09-24 | 2010-06-16 | 孙新江 | 485 interface converter |
| CN202094902U (en) * | 2011-06-14 | 2011-12-28 | 北京佳讯飞鸿电气股份有限公司 | Signaling monitoring device |
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| CN103199391A (en) | 2013-07-10 |
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