CN2687954Y

CN2687954Y - High-resistance multiplexing box for E1 digital relay line monitoring

Info

Publication number: CN2687954Y
Application number: CN 200420021359
Authority: CN
Inventors: 林闽
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-03-25
Filing date: 2004-03-25
Publication date: 2005-03-23
Anticipated expiration: 2014-03-25

Abstract

The utility model relates to a high-resistance multiplexing box used for the impedance conversion between a communication cable and a monitoring device and the realization of the long-distance monitoring, comprising a box body and a controlling circuit which is positioned in the box body. The high-resistance multiplexing box is characterized in that the two sides of the box body are provided with input and output terminals. The controlling circuit comprises a high-resistance isolation induced circuit and a signal enlarging and driving circuit which are sequentially connected in series between the input terminal and the output terminal and are mutually and electrically connected. The utility model solves the problems with overcoming difficulties existed in equipments in the prior art. The first solved problem is that as a monitoring device can be made up by using a conventional digital trunk switch-in equipment, the selectivity is largely increased and the application cost is greatly reduced. The second solved problem is that as the output signal of the junction box is the standard E1 digital trunk signal which is suitable for distant transmission, the distance between the monitoring device and the multiplexing point is basically unlimited to implement the application of long-distance monitoring whose distance can reach to several kilometers and simultaneously keep the communication quality of the signal.

Description

A kind of high-resistance multiplexing box that is used for the monitoring of E1 digital trunk

[technical field]

The utility model relates to a kind of communication apparatus, particularly relates to the impedance conversion equipment between a kind of communication cable and the watch-dog.

[background technology]

The E1 line is a kind of digital trunk that is used for telephone-switching network, and under some occasion, we need monitor the Content of Communication on the E1 line, for example dialog context is recorded, and analyzes the application such as stability indicator of call signaling.The equipment that can be used for E1 line high resistant multiple connection monitoring application at present can be divided into two classes: a class is the telecommunications test instrumentation, is used for the performance of E1 line is detected; Another kind of is sound pick-up outfit, and the voice signal on the E1 line is recorded.These equipment all have two common characteristic: the one, adopt the E1 digital trunk interface circuit of custom-designed high impedance input, so this is a kind of special equipment of particular design, and selectable kind and model are less, cost an arm and a leg.The 2nd, because digital trunk is a kind of high-frequency signal line, although the superincumbent equipment of multiple connection is high impedance, but be attempted by top extra lead and still can produce harmful effect signal, can cause the radiation and the interference of high-frequency signal, the distance of putting equipment itself from multiple connection when therefore this kind equipment inserts is subjected to conductor length and limits, generally can not surpass several meters to tens meters, its installation difficulty is big and can't realize remote monitoring.

[utility model content]

The technical problem that utility model will solve and the technical assignment of proposition are to overcome the technological deficiency that existing product exists, and the high-resistance multiplexing box that a kind of selectivity is big, the realization cost is low, can realize remote monitoring is provided.

The utility model is taked following technical scheme: a kind of high-resistance multiplexing box of the E1 of being used for digital trunk monitoring, comprise box body and be positioned at the control circuit of box body, the box body both sides are provided with input, lead-out terminal, and described control circuit comprises that being serially connected with the high-barrier that is electrically connected mutually between input, the lead-out terminal successively amplifies and drive circuit from sensor circuit and signal.The utility model is connected in reaches the design impedance value transform between digital trunk multiple connection point and the watch-dog and make the terminal box input have very high input impedance, output then can drive the signal input part of the E1 line equipment of standard, and small monitored signal is obtained in induction simultaneously.High-barrier is used for realizing electrical isolation effect between input terminal and the amplifying circuit and the effect of obtaining small monitored signal from the digital trunk induction from sensor circuit among the design, and signal amplifies and drive circuit plays the amplitude of the tiny signal of induction gained is amplified and waveform repaired the standard that makes it to reach the standard of E1 line and drive the load about 75 Ω or 120 Ω.During use, circuit butted line box input terminal presents the input impedance much higher with respect to the normal impedance of E1 line (generally can reach more than tens times), and the other parts and the input terminal of terminal box can be isolated on electric, the high frequency ac signal of promptly low frequency signal (for example 50HZ city signal of telecommunication) and direct current signal being isolated and only allowing to meet 2M digital junction signal spectrum scope passes through, and electrical isolation influences monitored quality of signals when effectively having avoided watch-dog to produce accident or fault; This circuit can be sensed any one from the E1 line simultaneously needs monitored tiny signal.The tiny signal that induction obtains amplifies and the drive circuit effect by signal, be amplified to normal signal level, and obtain enough driving forces, usually it can drive the load about 75 Ω or 120 Ω, to drive the signal input part (as the watch-dog that is made of the E1 interface) that adopts common E1 line equipment.The design's key is to make signal through isolating, and induction and the distortion of amplifying after strengthening are as far as possible little, can intactly reproduce the signal mode of multiple connection point, thereby reach the real-time monitoring that realizes under the prerequisite that does not influence communication the E1 line.

The circuit that described high-barrier adopts passive devices such as high-frequency pulse transformer and the resistance that is electrically connected with it, electric capacity to constitute from sensor circuit.Here high-frequency pulse transformer is a core component wherein, insulation between it is primary and secondary relation is used to the electrical isolation effect that reaches above-mentioned, and the pulse transfer function of transformer is used to realize the induction to monitored signal, a part of resistance in the circuit and capacitance series are at the input of transformer, be used to improve input impedance, another part resistance capacitance is used for signal waveform is compensated.By the meticulous coupling of transformer and peripheral passive device parameter, on the one hand realize trying one's best high input impedance, on the other hand as far as possible truly the waveform of playback input signal reduce to respond to the amplitude of gained signal simultaneously.

Comprise the automatic gain control circuit module in described signal amplification and the drive circuit, this module is that monitored signal and communication quality provides safeguard.Signal amplifies and the core of drive circuit is an operational amplifier, in order intactly to amplify the pulse signal of a 2M, need to use the ultrahigh speed operational amplifier of gain bandwidth product more than 300MHZ, can select the radio frequency operational amplifier for use, its driving force also just in time can reach the standard of 75 Ω or 120 Ω for this reason.The peripheral circuit of amplifier also needs coupling meticulously, to reach the purpose of further corrected signal wave mode.Automatic gain control circuit extracts signal from amplifier out, the variable attenuator of FEEDBACK CONTROL amplifier in, thereby stablize the spoke degree of output signal within the specific limits, make it to reach the signal level standard of normal E1 signal at output port, and irrelevant with the signal amplitude of input.Because the E1 signal has bigger decay from the receiving end of making a start of conveyer line, and watch-dog can insert in the optional position of conveyer line, and therefore the signal amplitude that monitors is different, and away from transmitting terminal, signal is more little.Set up automatic gain control circuit and played the effect that the teletransmission ability that guarantees signal is not influenced by access point position.

Described signal amplifies and drive circuit is powered by direct or indirect power-supply device.Power-supply device is used to amplification and drive circuit that stable low-voltage DC is provided among the design, it can be that independent common power equipment directly is circuit supply, the existing power supply that also can be other equipment is powered indirectly, as the utility model being designed to computer expansion card structure, signal amplifies and drive circuit is positioned on this plug-in card and can obtains the power taking source from the intercomputer of work.

Input on the described box body, lead-out terminal are many groups, these many group input and output terminals cooperate the control circuit that is attached thereto can realize that same equipment realizes the signal transformation of a plurality of communication ports simultaneously, be that equipment can be realized simultaneously a plurality of signals being monitored, thereby can reduce the quantity of equipment, reduce cost, improve reliability.

The utlity model has following advantage, it can solve the problem that existing equipment is difficult to overcome, and the one, watch-dog can use conventional digital junction access device to constitute, thereby alternative improves greatly and application cost reduces greatly; The 2nd, because the output signal of terminal box is the E1 digital junction signal of standard, be applicable to teletransmission, so watch-dog is unrestricted substantially from the distance of multiple connection point, can realize that distance reaches several kilometers remote monitoring application, has kept the communication quality of signal simultaneously.

[description of drawings]

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is user mode figure of the present utility model.

[embodiment]

Embodiment: as shown in the figure, the utility model comprises box body and is positioned at the control circuit of box body, the box body both sides are provided with input, lead-out terminal, control circuit is between this group input, lead-out terminal, from sensor circuit (is the circuit of core with the high-frequency pulse transformer) with signal amplifies and drive circuit (is the circuit of core with the operational amplifier) is formed, signal amplification and drive circuit are subjected to power supply and the effect of automatic gain control module simultaneously by the high-barrier of electricity serial connection successively.During use, the signal of input is isolated refinement through high-barrier from sensor circuit, induction obtains small monitored signal, and then the signal waveform of signal being amplified the complete reproduction multiple connection point of enhancing by amplifier, from lead-out terminal output word watch-dog, the automatic gain control module then plays the level that guarantees signal and reaches standard with the E1 line standard.

Claims

1, a kind of high-resistance multiplexing box that is used for the monitoring of E1 digital trunk, comprise box body and be positioned at the control circuit of box body, it is characterized in that described box body both sides are provided with input, lead-out terminal, described control circuit comprises that being serially connected with the high-barrier that is electrically connected mutually between input, the lead-out terminal successively amplifies and drive circuit from sensor circuit and signal.

2, high-resistance multiplexing box according to claim 1 is characterized in that the circuit that described high-barrier adopts passive devices such as high-frequency pulse transformer and the resistance that is electrically connected with it, electric capacity to constitute from sensor circuit.

3, high-resistance multiplexing box according to claim 1 is characterized in that comprising the automatic gain control circuit module in described signal amplification and the drive circuit.

4, high-resistance multiplexing box according to claim 1 and 2 is characterized in that described signal amplifies and drive circuit is powered by direct or indirect power-supply device.

5, high-resistance multiplexing box according to claim 1 and 2 is characterized in that input, the lead-out terminal on the described box body is many groups.