CN103199391A - Connecting box of communication collecting equipment - Google Patents
Connecting box of communication collecting equipment Download PDFInfo
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- CN103199391A CN103199391A CN2013100957494A CN201310095749A CN103199391A CN 103199391 A CN103199391 A CN 103199391A CN 2013100957494 A CN2013100957494 A CN 2013100957494A CN 201310095749 A CN201310095749 A CN 201310095749A CN 103199391 A CN103199391 A CN 103199391A
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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 of communicating by letter.
Background technology
The communication collecting device refers to the equipment for signaling, voice or the data of collection communication link, and it need be linked into when gathering in office side's link (as mobile backbone link), so may influence the normal operation of office side's link.For the 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 do not satisfy the requirement that big capacity is gathered.Therefore, the communication collecting device can adopt density height, DB68 interface that volume is little to come the E1 signal is caught usually, at this moment just need use patch panels.The effect of patch panels is exactly the mutual conversion of physical interface and the collecting device interface of realization office side link.Patch panels if impedance does not match, will be added impedance inverter circuit when carrying out interface conversion.
The E1 signal is caught except the needs patch panels, also need use the high resistant head.The effect of high resistant head be for realize high-barrier from, under the situation that does not influence office side E1 signal normal transmission, the E1 signals collecting got off and offer the communication collecting device by the mode of coupling.
At present, at the communication collecting device of E1 signal, generally need make high resistant head and manual overlap joint collection environment by hand: for office side's link, if the CC4 joint just need be used the patch panels at the CC4 interface; If RJ48 joint or RJ45 joint just need be used the patch panels at RJ48 interface or RJ45 interface.The step of its engineering overlap joint is complicated, is unfavorable for on-the-spot maintenance.And, its most function singleness, do not satisfy straight-through, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. the requirement of switching of different application scene.
Summary of the invention
In order to solve the problems of the technologies described above, the objective of the invention is: the terminal box that the collecting device of communicating by letter of a kind of height simple in structure, compatible and complete function is provided.
The technical scheme that technical solution problem of the present invention adopts is: a kind of terminal box of the collecting device of communicating by letter, comprise the first toggle switch circuit, the high resistant buffer circuit, the second toggle switch circuit, impedance inverter circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by impedance inverter circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of second interface.
Further, described high resistant buffer circuit comprises first resistance, second resistance and first transformer, described first transformer comprises primary coil, iron core and secondary coil, one end of described first resistance all is connected with second output of the described first toggle switch circuit with an end of second resistance, the other end of described first resistance is connected by primary coil and then with the other end of second resistance, and the output of described secondary coil is connected with second input of the second toggle switch circuit.
Further, described impedance inverter circuit comprises second transformer, and second output of the described second toggle switch circuit is connected by second transformer and then with second input of the 3rd toggle switch circuit.
Further, the described first toggle switch circuit comprises first toggle switch and second toggle switch, the input of the input of described first toggle switch and second toggle switch all is connected with the output of first interface, first output of described first toggle switch all is connected with the first input end of the second toggle switch circuit with first output of second toggle switch, and second output of described first toggle switch all is connected with the input of high resistant buffer circuit with second output of second toggle switch.
Further, the described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of first toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of second toggle switch, second input of described the 3rd toggle switch all is connected with the output of high resistant buffer circuit with second input of the 4th toggle switch, first output of described the 3rd toggle switch all is connected with the first input end of the 3rd toggle switch circuit with first output of the 4th toggle switch, and second output of described the 3rd toggle switch all is connected with the input of impedance inverter circuit with second output of the 4th toggle switch.
Further, described the 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 3rd toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 4th toggle switch, second input of described the 5th toggle switch all is connected with the output of impedance inverter circuit with second input of the 6th toggle switch, and the output of the output of described the 5th toggle switch and the 6th toggle switch all is connected with the input of second interface.
Further, described first interface is any one in CC4 interface, RJ48 interface and the RJ45 interface, and described second interface is the DB68 interface.
Further, described first resistance and second resistance are 680 ohm resistance.
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 of communicating by letter, comprise the first toggle switch circuit, impedance inverter circuit, the second toggle switch circuit, the high resistant buffer circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by impedance inverter circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of 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, can realize by the switching of first, second, and third toggle switch circuit leading directly to, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. the flexible switching of different application scene, simple in structure, simplified the step that the engineering overlap joint is gathered environment, compatible high, complete function, be applicable to various application scenarioss, greatly improved the efficient 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, can realize by the switching of first, second, and third toggle switch circuit leading directly to, impedance transformation, high-barrier from impedance transformation add high-barrier from etc. the flexible switching of different application scene, simple in structure, simplified the step that the engineering overlap joint is gathered environment, compatible high, complete function, be applicable to various application scenarioss, greatly improved the efficient of engineering maintenance.
Description of drawings
The invention will be further described below in conjunction with Figure of description and embodiment.
Fig. 1 is first theory diagram of the terminal box of a kind of collecting device of communicating by letter 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's first, second, and third toggle switch circuit;
Fig. 5 is the annexation figure of the present invention's the 5th toggle switch and the 6th toggle switch;
Fig. 6 is second theory diagram of the terminal box of a kind of collecting device of communicating by letter of the present invention.
Reference numeral: 1～8, each segment data circulation link; 9, primary coil; 10, secondary coil; R1, first resistance; R2, second resistance; T1, iron core; 11～18, go up the pin of toggle switch; 21～28, the pin of following 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 of communicating by letter, comprise the first toggle switch circuit, the high resistant buffer circuit, the second toggle switch circuit, impedance inverter circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by impedance inverter circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of second interface.
Wherein, first interface is the input interface of terminal box, is used for access office side link, thus the data that will gather from the input of office side's link;
The high resistant buffer circuit is used for office side's link and collecting device are kept apart, thereby reduces the influence of the collecting device side of playing a game Link State;
Impedance inverter circuit is used for carrying out impedance transformation, thereby makes the impedance matching of office side's link and collecting device;
The first toggle switch circuit, the second toggle switch circuit and the 3rd toggle switch circuit then realize jointly 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, is used for inserting collecting device, thereby will exports collecting device to through the data after the terminal box.
When environment is gathered in the communication of distributing frame overlap joint, the interface (second interface) that the physical interface (first interface) that need adopt according to office side's link and collecting device adopt adopts different signals collecting modes: if first interface is the CC4 interface, and the impedance of communication collecting device is 120 ohm, then needs impedance to change rotating function; If first interface is RJ48 or RJ45 interface, and the impedance of communication collecting device is 75 ohm, also needs impedance transformation function this moment; If the impedance matching of first interface and the collecting device of communicating by letter then only need be used the high resistant buffer circuit and be cooperated patch panels that the two connection is got final product.
As shown in Figure 1, the present invention only need can realize that different pieces of information flows to the conversion of scene (different application scene) by the switching of first, second, and third toggle switch circuit.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 are 1-〉2-〉3-〉4;
(2) high resistant isolation mode, data flow are 1-〉5-〉6-〉3-〉4;
(3) impedance transformation pattern, data flow are 1-〉2-〉7-〉8-〉4;
(4) high-barrier is from adding the impedance transformation pattern, and data flow is 1-〉5-〉6-〉7-〉8-〉4.
The present invention does not need to make separately the high resistant head again when engineering overlaps, need when not matching with the collecting device impedance of communicating by letter, office side's link not change patch panels yet, only need simultaneously the toggle switch circuit not arranged at application scenarios and get final product, can reduce the workload of the project implementation, reduce because the project process that construction brings.
With reference to Fig. 2, be further used as preferred embodiment, described high resistant buffer circuit comprises first resistance R 1, second resistance R 2 and first transformer, described first transformer comprises primary coil 9, iron core T1 and secondary coil 10, one end of one end of described first resistance R 1 and second resistance R 2 all is connected with second output of the described first toggle switch circuit, the other end of described first resistance R 1 is connected by primary coil 9 and then with the other end of second resistance R 2, and the output of described secondary coil 10 is connected with second input of the second toggle switch circuit.
Wherein, the high resistant buffer circuit carries out input and output by differential lines.As shown in Figure 2, the forward pin of second output of the first toggle switch circuit is connected by R1 and then with first pin of primary coil 9, and the reverse pin of second output of the first toggle switch circuit is connected by R2 and then with second pin of primary coil 9; And first pin of secondary coil 10 is connected with the forward pin of second input of the second toggle switch circuit, and second pin of secondary coil 10 is connected with the reverse pin of second input of the second toggle switch circuit.R1 and R2 are high resistance measurement, are the transformer of 1:1.15 and first transformer is turn ratio.The signal that source end (end at the first transformer place) can be sended over by resistance R 1 and R2 carry out high-barrier from, and by the first transformer cross-over connection to terminal (end at the first transformer secondary output coil place).The purpose of high resistant buffer circuit is for when collecting the source end signal, reduces the influence to end signal source, source.
With reference to Fig. 3, be further used as preferred embodiment, described impedance inverter circuit comprises second transformer, second output of the described second toggle switch circuit is connected by second transformer and then with 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 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 second output of the second toggle switch circuit, and second pin of primary coil is connected with the reverse pin of second output of the second toggle switch circuit; And first pin of secondary coil is connected with the forward pin of the 3rd toggle switch circuit input end, and 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 has: Z1/Z2=(N1/N2) ^2, the i.e. ratio of impedance equal coil ratio square.
For example second transformer need be realized 75 to 120 ohm impedance transformation, and work as Z1=75 this moment according to above-mentioned formula as can be known, Z2=120, and turn ratio N=1.26 can satisfy the requirement of impedance transformation.Adopt second transformer to realize impedance transformation, compare with other implementations, simpler, convenient and be easy to realize.
With reference to Fig. 4, be further used as preferred embodiment, the described first toggle switch circuit comprises first toggle switch and second toggle switch, the input of the input of described first toggle switch and second toggle switch all is connected with the output of first interface, first output of described first toggle switch all is connected with the first input end of the second toggle switch circuit with first output of second toggle switch, and second output of described first toggle switch all is connected with the input of high resistant buffer circuit with second output of second toggle switch.
With reference to Fig. 4, be further used as preferred embodiment, the described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of first toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of second toggle switch, second input of described the 3rd toggle switch all is connected with the output of high resistant buffer circuit with second input of the 4th toggle switch, first output of described the 3rd toggle switch all is connected with the first input end of the 3rd toggle switch circuit with first output of the 4th toggle switch, and second output of described the 3rd toggle switch all is connected with the input of impedance inverter circuit with second output of the 4th toggle switch.
With reference to Fig. 4, be further used as preferred embodiment, described the 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 3rd toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 4th toggle switch, second input of described the 5th toggle switch all is connected with the output of impedance inverter circuit with second input of the 6th toggle switch, and the output of the output of described the 5th toggle switch and the 6th toggle switch all is connected with the input of second interface.
Wherein, the function of first to the 6th toggle switch is all identical, all is the address switch of operating control, namely all is the microswitches that can stir with hand, is binary states toggle switch (comprising " ON " and " OFF " two states) and the present invention adopts.As shown in Figure 5,11,12,13 and 14 pin (or 21,22,23 and 24 pin) are the input pin of toggle switch, and 15,16,17 and 18 pin (or 25,26,27 and 28 pin) are the output pin of toggle switch.In the present invention, the first toggle switch circuit of being made up of 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.Below the 3rd toggle switch circuit be example, the principle of toggle switch circuit of the present invention is further elaborated.
With reference to Fig. 5, the 3rd toggle switch circuit is made of two toggle switchs up and down, and last toggle switch is the forward input and output, and following toggle switch is reverse input and output.Wherein, 2 pin of two toggle switch inputs and 4 pin (i.e. 12 among the figure and 14 pin or 22 and 24 pin) link together up and down, and 5 pin of output, 6 pin and 7 pin (i.e. 15 among the figure, 16 and 17 pin or 25,26 and 27 pin) link together.And output also can be received RJ48 interface (RJ48_0_+ and RJ48_0_-) except receiving DB68 interface of the present invention (DB68_0_+ and DB68_0_-), to meet the different needs:
(a) if realize signal straight-through (the CC4 interface is directly linked the DB68 interface), then only need up and down 1 pin (i.e. 11 among the figure and 21 pin) of toggle switch all to dial the state into ON, other pin are dialled to the OFF state and are got final product;
(b) if realize impedance transformation (the CC4 interface is received the RJ48 interface through after the impedance transformation), then only needing 2 pin of toggle switch up and down and 4 pin (i.e. 12 among the figure and 14 pin and 22 and 24 pin) to dial is the ON state, and other pin are dialled to the OFF state and got final product;
(c) if realize impedance transformation and high-barrier simultaneously from (the RJ48 interface is to the DB68 interface), only need then up and down that 3 pin (i.e. 13 among the figure and 23 pin) of toggle switch are set to the ON state, other pin are dialled to the OFF state and are got final product.
Be the certain applications scene more than, realize other different scenes application if desired, also need toggle switch circuit, impedance inverter circuit and high resistant buffer circuit are carried out suitable combination.
Be further used as preferred embodiment, described first interface is any one in CC4 interface, RJ48 interface and the RJ45 interface, and described second interface is the DB68 interface.
Be further used as preferred embodiment, described first resistance R 1 and second resistance R 2 are 680 ohm resistance.
680 ohm of 75 ohm and 120 ohm enough big of RJ48 interface with respect to the DB68 interface can be kept apart office side's link and collecting device 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 of communicating by letter of the present invention, comprise the first toggle switch circuit, impedance inverter circuit, the second toggle switch circuit, the high resistant buffer circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by impedance inverter circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of second interface.
Compare 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 are 1-〉2-〉3-〉4;
(2) high resistant isolation mode, data flow are 1-〉2-〉7-〉8-〉4;
(3) impedance transformation pattern, data flow are 1-〉5-〉6-〉3-〉4;
(4) high-barrier is from adding the impedance transformation pattern, and data flow is 1-〉5-〉6-〉7-〉8-〉4.
More than be that preferable enforcement of the present invention is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art make all equivalent variations or replacement also can doing under the prerequisite of spirit of the present invention, the distortion that these are equal to or replace all is included in the application's claim institute restricted portion.
Claims (9)
1. the terminal box of the collecting device of communicating by letter, it is characterized in that: comprise the first toggle switch circuit, the high resistant buffer circuit, the second toggle switch circuit, impedance inverter circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by impedance inverter circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of second interface.
2. the terminal box of a kind of collecting device of communicating by letter according to claim 1, it is characterized in that: described high resistant buffer circuit comprises first resistance (R1), second resistance (R2) and first transformer, described first transformer comprises primary coil (9), iron core (T1) and secondary coil (10), one end of one end of described first resistance (R1) and second resistance (R2) all is connected with second output of the described first toggle switch circuit, the other end of described first resistance (R1) is connected by primary coil (9) and then with the other end of second resistance (R2), and the output of described secondary coil (10) is connected with second input of the second toggle switch circuit.
3. the terminal box of a kind of collecting device of communicating by letter according to claim 2 is characterized in that:
Described impedance inverter circuit comprises second transformer, and second output of the described second toggle switch circuit is connected by second transformer and then with second input of the 3rd toggle switch circuit.
4. the terminal box of a kind of collecting device of communicating by letter according to claim 1, it is characterized in that: the described first toggle switch circuit comprises first toggle switch and second toggle switch, the input of the input of described first toggle switch and second toggle switch all is connected with the output of first interface, first output of described first toggle switch all is connected with the first input end of the second toggle switch circuit with first output of second toggle switch, and second output of described first toggle switch all is connected with the input of high resistant buffer circuit with second output of second toggle switch.
5. the terminal box of a kind of collecting device of communicating by letter according to claim 4, it is characterized in that: the described second toggle switch circuit comprises the 3rd toggle switch and the 4th toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of first toggle switch, the first input end of the first input end of described the 3rd toggle switch and the 4th toggle switch all is connected with first output of second toggle switch, second input of described the 3rd toggle switch all is connected with the output of high resistant buffer circuit with second input of the 4th toggle switch, first output of described the 3rd toggle switch all is connected with the first input end of the 3rd toggle switch circuit with first output of the 4th toggle switch, and second output of described the 3rd toggle switch all is connected with the input of impedance inverter circuit with second output of the 4th toggle switch.
6. the terminal box of a kind of collecting device of communicating by letter according to claim 5, it is characterized in that: described the 3rd toggle switch circuit comprises the 5th toggle switch and the 6th toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 3rd toggle switch, the first input end of the first input end of described the 5th toggle switch and the 6th toggle switch all is connected with first output of the 4th toggle switch, second input of described the 5th toggle switch all is connected with the output of impedance inverter circuit with second input of the 6th toggle switch, and the output of the output of described the 5th toggle switch and the 6th toggle switch all is connected with the input of second interface.
7. according to the terminal box of each described a kind of collecting device of communicating by letter of claim 1-6, it is characterized in that: described first interface is any one in CC4 interface, RJ48 interface and the RJ45 interface, and described second interface is the DB68 interface.
8. the terminal box of a kind of collecting device of communicating by letter according to claim 2, it is characterized in that: described first resistance (R1) and second resistance (R2) are 680 ohm resistance.
9. the terminal box of the collecting device of communicating by letter, it is characterized in that: comprise the first toggle switch circuit, impedance inverter circuit, the second toggle switch circuit, the high resistant buffer circuit, the 3rd toggle switch circuit, for first interface of access office side link with for second interface that inserts collecting device, the output of described first interface is connected with the input of the first toggle switch circuit, first output of the described first toggle switch circuit is connected with the first input end of the second toggle switch circuit, second output of the described first toggle switch circuit is connected by impedance inverter circuit and then with second input of the second toggle switch circuit, first output of the described second toggle switch circuit is connected with the first input end of the 3rd toggle switch circuit, second output of the described second toggle switch circuit is connected by the high resistant buffer circuit and then with second input of the 3rd toggle switch circuit, and the output of described the 3rd toggle switch circuit is connected with the input of 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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| 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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