CN201114330Y

CN201114330Y - ADSL voice separator circuit

Info

Publication number: CN201114330Y
Application number: CNU2007201492598U
Authority: CN
Inventors: 吴明元
Original assignee: SHENZHEN TR-PARK ELECTRONIC Co Ltd
Current assignee: SHENZHEN TR-PARK ELECTRONIC Co Ltd
Priority date: 2007-05-22
Filing date: 2007-05-22
Publication date: 2008-09-10
Anticipated expiration: 2017-05-22

Abstract

The utility model discloses an ADSL speech separator circuit. The circuit comprises an overvoltage protection circuit consisting of detonators prevention, and a low pass and high resistance filter circuit consisting of a common mode inductor T1, a common inductor T2, a common inductor T3 and C1, C2, C3 and C4, wherein the low pass and high resistance filter circuit is connected with the overvoltage protection circuit via the common inductor. The ADSL speech separator circuit is applicable to telephone lines with ADSL and ADSL 2 adding service and can separate a low frequency signal from a high frequency data signal, thereby the two signals do not interrupt each other through the same line.

Description

A kind of ADSL Splitter circuit

Technical field:

The utility model relates to the communications field, in particular a kind of circuit structure of ADSL Splitter.

Background technology:

Along with the development of data service, ADSL (ADSL (Asymmetric Digital Subscriber Line)) is more and more paid attention to as a kind of comparatively desirable selection of conventional telecommunications operator broadband access and is promoted.ADSL network data signals and telephone signal are used the telephone wire transmission jointly, this moment, the network data transmission signal can produce mutual interference mutually with telephone signal, will cause like this in and can't answer or call, perhaps when conversation, can't surf the Net by ADSL Modem online.

Summary of the invention:

In order to solve the problems of the technologies described above, the purpose of this utility model is to provide a kind of ADSL Splitter circuit, thereby when realizing online, can normal talking, and when making a phone call, can prevent the interference of telephone signal to network signal, and the metering pulse that does not influence phone is passed through.

The utility model is achieved through the following technical solutions: a kind of ADSL Splitter circuit; comprise overvoltage crowbar of being made up of anti-thunder tube and the low pass high resistant filter circuit of being made up of common mode inductance T1, T2, T3 and C1, C2, C3, C4, described low pass high resistant filter circuit is connected with overvoltage crowbar by common mode inductance.

Surge voltages such as described overvoltage crowbar is used to prevent to be struck by lightning are to the damage of phone and MODEM.

Described low pass high resistant filter circuit is connected with phone; The signal input part of described overvoltage crowbar is connected with MODEM.

ADSL Splitter circuit described in the utility model; comprise overvoltage crowbar of forming by anti-thunder tube and the low pass high resistant filter circuit of forming by common mode inductance T1, T2, T3 and C1, C2, C3, C4; the high-frequency signal that can realize high-frequency signal 30K～2.208M that the normal speech signal below the 16KHz and ADSL are needed by this circuit separately; stop the interference of phone and facsimile machine signal, reduce noise, improve signal quality the ADSL signal.

Description of drawings:

Fig. 1 is the utility model circuit theory diagrams.

Embodiment:

Below in conjunction with the drawings and specific embodiments the utility model is described in further details.

As shown in Figure 1; the utility model is a kind of ADSL2+ Splitter circuit; comprise overvoltage crowbar of being made up of anti-thunder tube and the low pass high resistant filter circuit of being made up of common mode inductance T1, T2, T3 and C1, C2, C3, C4, described low pass high resistant filter circuit is connected with overvoltage crowbar by common mode inductance.

The utility model also comprises a kind of ADSL separator, and this separator adopts circuit described in the utility model, is external Splitter.

ADSL utilizes the technology of frequency division that the low frequency signal that ordinary telephone wiring transmitted is separated with high-frequency signal.The following power supply words of 3400Hz are used the above HFS of 25KHz to keep supplying net and are used, promptly transmit data and voice signal respectively on same copper cash, and data-signal is not by the telephone exchange machine equipment.So both can provide high-speed transfer: the low speed digital signal transmission of up (from user-to-network) can reach 640Kbps, and the high-speed digital signal transmission of descending (from the network to user) can reach 7Mbps; And in online, do not influence the normal use of phone.And the effect of separator is exactly that the high-frequency signal in the ADSL telephone line is separated with low frequency signal.

The utility model circuit theory is: overvoltage crowbar that anti-thunder tube is formed and the low pass high resistant filter circuit of being made up of common mode inductance T1, T2, T3 and C1, C2, C3, C4; this low pass high resistant filter circuit can make the low-frequency audio signal of 0-16KHZ pass through; particularly the teletax signal of 16KHZ passes through; thereby the frequency 25KHZ-138KHZ that makes the ADSL up direction decays to less than 65DB; downstream signal 138KHZ-2.208MHZ decays to less than 65DB, and its return loss is greater than 18DB simultaneously.LINE IN is outdoor circuit input in the utility model, here include the ADSL digital signal and also have telephone speech signal, this part directly passes through TO MODEM interface to ADSL MODEM, this signal is through the low pass high-cut filter of the inductance capacitance composition of back then, isolate out high-frequency digital signal, like this, TO PHONE interface just only has been left telephone speech signal and teletax signal, thereby provides clean voice signal for phone.

Adopt the ADSL Splitter of circuit described in the utility model, be applicable to India and domestic ADSL2+ scheme, wherein the frequency range of ADSL2+ is sound channel 100HZ-16KHZ, ADSL network digital signalling channel 25KHZ-2.208MHZ.Contrasting the utility model by experiment has bigger improvement compared with prior art at aspect of performance, and such as being under the situation of 250V/MA in test condition, the withstand voltage minimum of the utility model reaches 2S; Input signal is when 300-500HZ, and return loss is greater than 14DB; Input signal is when 500HZ-2000HZ, and return loss is greater than 18DB; Input signal is when 2KHZ-3.4KHZ, and return loss is greater than 18DB; Input signal inserts loss and is 1DB to the maximum when 200-4KHZ; Input signal is when 200-4KHZ, and decay is less than 1DB; Input signal is when 30K-1104KHZ, and decay is greater than 65DB; Input signal is when 1104KHZ-2208KHZ, and decay is greater than 65DB; The decay of ADSL band signal, signal frequency is when 30KHZ-2208KHZ; Maximum attenuation is 0.25DB; Input signal is when 30-1MHZ, and longitudinal balance is greater than 55DB; Input signal is when 1MHZ-5MHZ, and longitudinal balance is greater than 30DB; Input signal is when 0.2-4KHZ, and waveform delay is 250S to the maximum; Input signal is when 300HZ-3.4KHZ, and AC impedance is 600 ohm.

More than a kind of ADSL splitter circuit described in the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims

1. ADSL Splitter circuit; it is characterized in that: comprise overvoltage crowbar of being made up of anti-thunder tube and the low pass high resistant filter circuit of being made up of common mode inductance T1 T2 T3 and C1 C2 C3 C4, described low pass high resistant filter circuit is connected with overvoltage crowbar by common mode inductance.

2. ADSL splitter circuit according to claim 1 is characterized in that: described low pass high resistant filter circuit is connected with phone; The signal input part of described overvoltage crowbar is connected with MODEM.