CN113382121A

CN113382121A - Single-board circuit, transformer and DSL client device

Info

Publication number: CN113382121A
Application number: CN202010157127.XA
Authority: CN
Inventors: 杨继春; 邓超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2021-09-10
Anticipated expiration: 2040-03-09
Also published as: CN113382121B

Abstract

An embodiment of the present application provides a single board circuit, a transformer, and a DSL client device, where the single board circuit includes: the system comprises a transformer, a telephone line interface, a first working mode circuit, a second working mode circuit and an SOC chip; the transformer includes: a primary coil, a first secondary coil and a second secondary coil; the system comprises a DSL client device, an SOC chip, a first working mode circuit, a second working mode circuit, a transformer, a first secondary coil port, a second secondary coil port, a primary coil port and a telephone line interface, wherein the SOC chip is connected with the first working mode circuit and the second working mode circuit, the first working mode circuit is connected with the first secondary coil port of the transformer, the second working mode circuit is connected with the second secondary coil port of the transformer, and the primary coil port of the transformer is connected with the telephone line interface, so that when the DSL client device works in the first working mode or the second working mode, downlink signals from a DSL local side can be transmitted to the SOC chip, and uplink signals output by the SOC chip can be transmitted to the DSL local side. The embodiment of the application improves the protection performance of the DSL client equipment.

Description

Single-board circuit, transformer and DSL client device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a single board circuit, a transformer, and DSL client equipment.

Background

A single board circuit of a Digital Subscriber Line (DSL) terminal includes a System-on-a-Chip (SOC) Chip and a peripheral analog circuit connected to the SOC Chip. At present, the purpose that DSL client equipment can be switched between two operating modes is realized by using a relay in a peripheral analog circuit of a single board circuit, so as to meet different requirements of users.

Because the relay is connected with the telephone line outside the DSL client device, and the telephone line is arranged outdoors, the lightning-resistant performance of the relay determines the protection performance of the DSL client device, so that the protection performance of the DSL client device is limited.

Disclosure of Invention

The embodiment of the application provides a single board circuit, a transformer and DSL client equipment, which can improve the protection performance of the DSL client equipment.

In a first aspect, an embodiment of the present application provides a single board circuit, where the single board circuit is used for a DSL client device of a digital subscriber line, and the single board circuit includes: the system comprises a transformer, a telephone line interface, a first working mode circuit, a second working mode circuit and an SOC chip; the transformer includes: a primary coil, a first secondary coil and a second secondary coil; the SOC chip is connected to the first operating mode circuit and the second operating mode circuit, the first operating mode circuit is connected to a first secondary coil port of the transformer, the second operating mode circuit is connected to a second secondary coil port of the transformer, and a primary coil port of the transformer is connected to a telephone line interface, so that when the DSL client device operates in the first operating mode or in the second operating mode, the DSL client device can transmit a downlink signal from the DSL office to the SOC chip and transmit an uplink signal output from the SOC chip to the DSL office.

In the scheme, the single board circuit of the DSL client device does not comprise a relay, a transformer in the single board circuit is connected with a telephone line which is arranged outside the DSL client device and outdoors, the transformer can realize the isolation of a primary side and a secondary side, and the surge protection capability is higher than that of the relay, so that the protection performance of the DSL client device is improved. Meanwhile, the single board circuit of the DSL client apparatus in this embodiment combines two transformers into one on the basis of removing the relay, which can further reduce the size of the single board circuit, and is favorable for implementing a miniaturized design of the DSL client apparatus.

In one possible embodiment, the primary coil comprises at least two coils connected in series.

The scheme can ensure the inductance of the primary coil of the transformer.

In one possible embodiment, the first secondary coil comprises at least two coils connected in series.

The scheme can ensure the inductance of the first secondary coil of the transformer.

In one possible embodiment, the second secondary coil comprises at least two coils connected in series.

The scheme can ensure the inductance of the second secondary coil of the transformer.

In a possible implementation, when the DSL client device operates in the first operating mode, the SOC chip is configured to process a first signal input by the first operating mode circuit, and discard a second signal input by the second operating mode circuit; when the DSL client device operates in the second operating mode, the SOC chip is configured to process the second signal input by the second operating mode circuit, and discard the first signal input by the first operating mode circuit.

The scheme can ensure that the DSL client equipment can still normally communicate after the relay is removed.

In one possible implementation, the first operating mode circuit includes: the SOC chip comprises a first amplifier chip and a first hybrid circuit, wherein the input end of the first amplifier chip and the output end of the first hybrid circuit are both connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are both connected with the port of the first secondary coil of the transformer, and the output end of the first amplifier chip is also connected with the input end of the first hybrid circuit; when the DSL client device operates in the first operating mode, the first amplifier chip is configured to amplify an uplink signal output by the SOC chip, and the first hybrid circuit is configured to remove the uplink signal input by the transformer to the first hybrid circuit to obtain a downlink signal from the DSL office.

The first working mode circuit in the scheme can ensure that when the DSL client device works in the first working mode, the downlink signal from the DSL local side can be transmitted to the SOC chip and the uplink signal output by the SOC chip can be transmitted to the DSL local side.

In one possible implementation, the second operating mode circuit includes: the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are both connected with the port of the second secondary coil of the transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit; when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the second hybrid circuit is configured to remove the uplink signal input by the transformer to the second hybrid circuit to obtain a downlink signal from the DSL office.

The second working mode circuit in the scheme can ensure that when the DSL client device works in the second working mode, the downlink signal from the DSL local side can be transmitted to the SOC chip and the uplink signal output by the SOC chip can be transmitted to the DSL local side.

In one possible implementation, the second operating mode circuit includes: a second amplifier chip, a second hybrid circuit, and an isolation circuit; the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip, the output end of the second amplifier chip and the isolation circuit are both connected with the port of the second secondary coil of the transformer, the input end of the second hybrid circuit is connected with the isolation circuit, and the output end of the second amplifier chip is also connected with the isolation circuit; when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, the isolation circuit is configured to remove a signal on the first secondary winding side of the transformer included in a signal input to the isolation circuit by the transformer, and the second hybrid circuit is configured to remove the uplink signal input to the second hybrid circuit by the isolation circuit to obtain a downlink signal from the DSL office.

The second working mode circuit in the scheme can ensure that when the DSL client device works in the second working mode, the downlink signal from the DSL local side can be transmitted to the SOC chip and the uplink signal output by the SOC chip can be transmitted to the DSL local side. In addition, the isolation circuit can remove signals mixed in the signals input into the isolation circuit and on the side of the first secondary coil of the transformer, and normal communication of the DSL terminal equipment is guaranteed.

In one possible embodiment, the isolation circuit includes: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an inductor; a first end of the first capacitor and a first end of the third capacitor are both connected with the second hybrid circuit, a second end of the first capacitor is connected with a first end of the second capacitor, a second end of the second capacitor is connected with one of the second secondary ports, a second end of the third capacitor is connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is connected with the other of the second secondary ports; the first end of the inductor is connected with the second end of the first capacitor and the first end of the second capacitor respectively, and the second end of the inductor is connected with the second end of the third capacitor and the first end of the fourth capacitor respectively.

The scheme provides a specific implementation of the isolation circuit.

In a second aspect, an embodiment of the present application provides a single board circuit, configured to a DSL client device, including: the system comprises a telephone line interface, a first transformer, a second transformer, a first working mode circuit, a second working mode circuit and an SOC chip; the SOC chip is connected to the first operating mode circuit and the second operating mode circuit, the first operating mode circuit is connected to the secondary coil port of the first transformer, the second operating mode circuit is connected to the secondary coil port of the second transformer, and both the primary coil port of the first transformer and the primary coil port of the second transformer are connected to a telephone line interface, so that when the DSL client device operates in the first operating mode or in the second operating mode, the DSL client device can transmit a downlink signal from the DSL central office to the SOC chip and transmit an uplink signal output from the SOC chip to the DSL central office.

The single board circuit of the DSL client device in the scheme does not comprise a relay, a transformer in the single board circuit is connected with a telephone line which is arranged outside the DSL client device and outdoors, the transformer can realize the isolation of a primary side and a secondary side, and the surge protection capability is higher than that of the relay, so that the protection performance of the DSL client device is improved. In addition, the elimination of the relay can also reduce the size of the single-board circuit, which is beneficial to realizing the miniaturization design of DSL client equipment.

In one possible implementation, the first operating mode circuit includes: the SOC chip comprises a first amplifier chip and a first hybrid circuit, wherein the input end of the first amplifier chip and the output end of the first hybrid circuit are both connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are both connected with the secondary coil port of the first transformer, and the output end of the first amplifier chip is also connected with the input end of the first hybrid circuit; when the DSL client device operates in the first operating mode, the first amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the first hybrid circuit is configured to remove the uplink signal input by the first transformer to the first hybrid circuit to obtain the downlink signal from the DSL office.

In one possible implementation, the second operating mode circuit includes: the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are both connected with the secondary coil port of the second transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit; when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the second hybrid circuit is configured to remove the uplink signal input by the second transformer to the second hybrid circuit to obtain the downlink signal from the DSL office.

In a third aspect, an embodiment of the present application provides a transformer, including: the magnetic core comprises a primary coil, a first secondary coil and a second secondary coil, wherein the first secondary coil is wound around the periphery of the magnetic core, the primary coil is wound around the periphery of the first secondary coil, and the second secondary coil is wound around the periphery of the primary coil.

The transformer of the scheme can enable the relay of the single board circuit in the DSL client device to be removed and then the downlink signal from the DSL local side can still be transmitted to the SOC chip and the uplink signal output by the SOC chip can still be transmitted to the DSL local side.

In a possible embodiment, the primary coil comprises at least two coils, which are connected in series.

The scheme can ensure the inductance of the primary coil of the transformer.

In a possible embodiment, the first secondary coil comprises at least two coils, which are connected in series.

In a possible embodiment, the second secondary coil comprises at least two coils, which are connected in series.

In a fourth aspect, an embodiment of the present application provides a DSL client device, including the single-board circuit described in the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, an embodiment of the present application provides a DSL client device, including the single-board circuit described in any possible implementation manner of the second aspect or the second aspect.

The single board circuit of the DSL client device does not comprise a relay, a transformer in the single board circuit is connected with an outdoor telephone line which is arranged outside the DSL client device, the transformer can realize the isolation of a primary side and a secondary side, and the surge protection capability is higher than that of the relay, so that the protection performance of the DSL client device is improved. Meanwhile, the single board circuit of the DSL client apparatus in this embodiment eliminates the relay, which can reduce the size of the single board circuit, and is favorable for implementing a miniaturized design of the DSL client apparatus.

Drawings

Figure 1 is a system architecture for DSL

Fig. 2 is a first schematic diagram of a present single-board circuit of DSL client equipment;

fig. 3 is a schematic diagram of a single-board circuit of a current DSL client device;

fig. 4 is a schematic diagram of a first transformer in a single board circuit of a current DSL customer premise equipment;

fig. 5 is a first schematic structural diagram of a single-board circuit of a DSL client device according to an embodiment of the present application;

fig. 6 is a second schematic structural diagram of a single-board circuit of a DSL client device according to an embodiment of the present application;

fig. 7 is a third schematic structural diagram of a single-board circuit of a DSL client device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a third transformer according to an embodiment of the present application;

fig. 9 is a fourth schematic structural diagram of a single-board circuit of a DSL client device according to an embodiment of the present application;

fig. 10 is a fifth schematic structural diagram of a single-board circuit of a DSL client device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of an isolation circuit according to an embodiment of the present application.

Detailed Description

For a better understanding of the present application, the present application incorporates the following elements.

DSL is a transmission technology using copper telephone twisted pair as a transmission medium. The DSL includes Asymmetric DSL (VDSL), Very High Speed DSL (VDSL), and g.fast. Where G in g.fast represents ITU-T G series recommendations, Fast in g.fast is an abbreviation for Fast access to subscriber terminals (Fast access to subscribers).

Figure 1 is a system architecture for DSL. Referring to fig. 1, a DSL terminal is connected to a DSL customer premise equipment (DSL CPE), the DSL customer premise equipment is connected to a DSL office via a copper telephone twisted pair, and the DSL office accesses an external network. The signal sent by the DSL terminal to the DSL office is called an uplink signal, and the signal sent by the DSL office to the DSL terminal is called a downlink signal.

Among them, the DSL terminal may be, for example, a Personal Computer (PC); the DSL client device may be a modem (modem).

The present application relates to improvements to on-board circuitry within DSL client devices.

For a better understanding of the present application, the on-board circuitry of an existing DSL client device is first described.

Fig. 2 is a first schematic diagram of a present single-board circuit of DSL client equipment. Referring to fig. 2, the single board circuit of the DSL client apparatus includes an SOC chip 21, a first operation mode circuit 22, a second operation mode circuit 23, a first transformer 24, a second transformer 25, a relay 26, and a telephone line interface 27. The peripheral analog circuit of the SOC chip 21 includes: a first operation mode circuit 22, a second operation mode circuit 23, a first transformer 24, a second transformer 25, a relay 26, and a telephone line interface 27. The telephone line interface 27 is an interface of an external telephone line to achieve the purpose that the DSL client device communicates with the DSL office via the telephone line.

The SOC chip 21 is connected to a first operation mode circuit 22 and a second operation mode circuit 23, the first operation mode circuit 22 is connected to a secondary winding port of a first transformer 24, and the second operation mode circuit 23 is connected to a secondary winding port of a second transformer 25. The primary coil port of the first transformer 24 and the primary coil port of the second transformer 25 are connected to a relay 26, and the relay 26 is connected to a telephone line interface 27.

If the DSL client device is configured to operate in the first operation mode, the SOC chip 21 is in a state of being connected to the first operation mode circuit 22 and disconnected from the second operation mode circuit 23, and the relay 26 is in a state of being connected to the primary coil port of the first transformer 24 and disconnected from the primary coil port of the second transformer 25. At this time, when the DSL client device communicates with the DSL central office, the uplink signal sent by the SOC chip 21 is transmitted to the DSL central office via the first operating mode circuit 22, the first transformer 24, the relay 26, the telephone line interface 27, and the telephone line, and the downlink signal from the DSL central office is transmitted to the telephone line interface 27 via the telephone line, and is transmitted to the SOC chip 21 via the relay 26, the first transformer 24, the first operating mode circuit 22, and the telephone line.

If the user needs to change, the user wants the DSL client device to operate in the second operating mode, in one mode, the DSL office sends a switching command to the DSL client device, the switching command is transmitted to the telephone line interface 27 via the telephone line, and is transmitted to the SOC chip 21 via the relay 26, the first transformer 24, and the first operating mode circuit 22, the SOC chip 21 generates a high-level signal according to the switching command, and the high-level signal is input to the relay 26 via a General-purpose input/output (GPIO) pin, so as to control the relay 26 to be connected to the primary port of the second transformer 25 and disconnected from the primary coil port of the first transformer 24; and the SOC chip 21 is turned on with the second operation mode circuit 23 and turned off with the first operation mode circuit 22 according to the switching command. At this time, when the DSL client device communicates with the DSL central office, the uplink signal output by the SOC chip 21 is transmitted to the DSL central office via the second operation mode circuit 23, the second transformer 25, the relay 26, the telephone line interface 27, and the telephone line, and the downlink signal from the DSL central office is transmitted to the telephone line interface 27 via the telephone line, and is transmitted to the SOC chip 21 via the relay 26, the second transformer 25, and the second operation mode circuit 23.

The signal transmission rate of the first operating mode and the second operating mode are different, for example, the first operating mode may be an ADSL operating mode or a VDSL operating mode, and the second operating mode may be a g.fast operating mode.

In one arrangement, the first operating mode circuit 22 may include a first amplifier chip 221 and a first hybrid 222. The second operation mode circuit 23 may include a second amplifier chip 231 and a second hybrid circuit 232. The corresponding single-board circuit of the DSL client device may be as shown in fig. 3, where fig. 3 is a schematic diagram two of the current single-board circuit of the DSL client device. Referring to fig. 3, the single board circuit of the DSL client apparatus includes an SOC chip 21, a first amplifier chip 221, a first hybrid circuit 222, a second amplifier chip 231, a second hybrid circuit 232, a first transformer 24, a second transformer 25, a relay 26, and a telephone line interface 27. The hybrid circuit is also called a two/four wire converter circuit, and the english name is hybird circuit.

The SOC chip 21 is connected to an input terminal of the first amplifier chip 221, an output terminal of the first hybrid circuit 222, an input terminal of the second amplifier chip 231, and an output terminal of the second hybrid circuit 232. The output terminal of the first amplifier chip 221 and the input terminal of the first hybrid circuit 222 are both connected to the secondary winding port of the first transformer 24, and the output terminal of the first amplifier chip 221 is also connected to the input terminal of the first hybrid circuit 222. An output terminal of the second amplifier chip 231 and an input terminal of the second hybrid circuit 232 are connected to a secondary coil port of the second transformer 25, and an output terminal of the second amplifier chip 231 is also connected to an input terminal of the second hybrid circuit 232. The primary coil port of the first transformer 24 and the primary coil port of the second transformer 25 are both connected to a relay 26, and the relay 26 is connected to a telephone line interface 27.

If the DSL client device operates in the first operation mode, the SOC chip 21 is in a state of being connected to the input terminal of the first amplifier chip 221 and disconnected from the input terminal of the second amplifier chip 231, and the relay 26 is in a state of being connected to the primary coil port of the first transformer 24 and disconnected from the primary coil port of the second transformer 25. At this time, the uplink signal sent by the SOC chip 21 passes through the first amplifier chip 221, the first transformer 24, the relay 26, and the telephone line interface 27 in sequence, and is transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the relay 26, the first transformer 24, and the first hybrid circuit 222. It can be understood that, based on the circuit structure of fig. 3, the uplink signal is mixed in the signal input to the first hybrid circuit 222 by the first transformer 24, and the uplink signal output to the first hybrid circuit 222 by the first amplifier chip 221 is removed by the first hybrid circuit 222 to obtain the downlink signal from the DSL office for processing by the SOC chip 21.

If the DSL client device operates in the second operation mode, the SOC chip 21 is in a state of being disconnected from the input terminal of the first amplifier chip 221 and being connected to the input terminal of the second amplifier chip 231, and the relay 26 is in a state of being disconnected from the primary coil port of the first transformer 24 and being connected to the primary coil port of the second transformer 25. At this time, the uplink signal output by the SOC chip 21 passes through the second amplifier chip 231, the second transformer 25, the relay 26, and the telephone line interface 27 in sequence, and is transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the relay 26, the second transformer 25, and the second hybrid circuit 232. It can be understood that, based on the circuit structure of fig. 3, the uplink signal is mixed in the signal input to the second hybrid circuit 232 by the second transformer 25, and the uplink signal is removed from the signal input to the second hybrid circuit 232 by the second hybrid circuit 232 based on the uplink signal output to the second hybrid circuit 232 by the second amplifier chip 231, so as to obtain the downlink signal from the DSL office for processing by the SOC chip 21.

Fig. 4 is a schematic diagram of a first transformer in a single board circuit of a current DSL client device, where a primary side of the first transformer 24 is a side of a primary coil port of the first transformer 24 toward a relay 26, and is connected to an external telephone line; the secondary side of the first transformer 24 is a side of the secondary coil port of the first transformer 24 toward the SOC chip 21. The first transformer 24 is used for isolation between the primary side and the secondary side, so that surge protection capability of the secondary side of the first transformer 24 is improved, and external common mode noise can be inhibited from entering the inside of a single board of the DSL client device. The second transformer 25 has the same or similar structure as the first transformer 24, and is also used for isolation between the primary side and the secondary side, so as to improve the surge protection capability of the secondary side of the second transformer 25, and also suppress external common mode noise from entering the interior of the single board of the DSL client device.

In summary, in the existing single board circuit of the DSL client device, a relay is required to implement the purpose that the DSL client device can switch between two working modes, so as to meet different requirements of users. Because the relay is connected with the telephone line which is arranged outside the DSL client device and is arranged outdoors, the protection performance of the DSL client device is limited by the lightning-resistant performance of the relay, namely the surge protection capability of the relay. In addition, the control module and the contact module in the relay are filled with inert gas, so that the preparation process is complex and the cost is high.

Therefore, the inventor finds that if the relay in the single board circuit of the DSL client device is removed, the transformer in the single board circuit is connected to the telephone line outside the DSL client device and set outdoors, and the transformer can achieve isolation between the primary side and the secondary side, and the surge protection capability is higher than that of the relay, so that after the relay is removed, the protection performance of the DSL client device is no longer limited by the relay, and the protection performance of the DSL client device is improved. However, the following technical difficulties exist after the relay is removed: no matter what working mode the DSL client device is configured to work in, the downlink signal from the DSL office is sent to the SOC chip via the first transformer and the first working mode circuit, and is also sent to the SOC chip via the second transformer and the second working mode circuit, so that the SOC chip receives two paths of signals, but only one path of correct signal affects normal operation of the SOC chip, and thus normal communication of the DSL client device is affected. In order to overcome the technical problem existing after the relay is removed, the inventor finds that the control program of the SOC chip can be updated, so that the SOC chip only processes one correct path of signal and discards the other path of signal, and thus, the technical scheme of improving the protection performance of the DSL client device by removing the relay of the single board circuit can be realized.

The single board circuit of the DSL client device provided in the present application is described in detail below.

Fig. 5 is a schematic structural diagram of a single board circuit of DSL client equipment according to an embodiment of the present application, referring to fig. 5, the single board circuit of this embodiment includes: SOC chip 21, first operation mode circuit 22, second operation mode circuit 23, first transformer 24, second transformer 25, telephone line interface 27. No relay is provided between the first transformer 24 and the telephone line interface 27. No relay is provided between the second transformer 25 and the telephone line interface 27.

Wherein the first operation mode circuit 22 and the second operation mode circuit 23 are both connected to the SOC chip 21. The first operating mode circuit 22 is also connected to a secondary winding port of the first transformer 24, and a primary winding port of the first transformer 24 is connected to the telephone line interface 27. The second operation mode circuit 23 is also connected to a secondary coil port of the second transformer 25, and a primary coil port of the second transformer 25 is connected to the telephone line interface 27.

The telephone line interface 27 in this embodiment is an interface of an external telephone line, so as to achieve the purpose that the DSL client device communicates with the DSL office via the telephone line.

If the DSL client device is configured to operate in the first operating mode, when the DSL client device communicates with the DSL central office, the uplink signal output by the SOC chip 21 is transmitted to the DSL central office through the first operating mode circuit 22, the first transformer 24, the telephone line interface 27 and the telephone line, and the downlink signal from the DSL central office is transmitted to the SOC chip 21 through the telephone line and the first operating mode circuit 22 after being transmitted to the telephone line interface 27, that is, the SOC chip 21 can receive the first signal output by the first operating mode circuit 22. In addition, after the downlink signal from the DSL office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is further transmitted to the SOC chip 21 through the second transformer 25 and the second operation mode circuit 23, that is, the SOC chip 21 can receive the second signal output by the second operation mode circuit 23. Since the DSL client device is currently configured to operate in the first operating mode, the SOC chip 21 processes the first signal output by the first operating mode circuit 22 and discards the second signal output by the second operating mode circuit 23 to ensure normal communication of the DSL client device.

If the DSL client device is configured to operate in the second operating mode, when the DSL client device communicates with the DSL central office, the uplink signal output by the SOC chip 21 is transmitted to the DSL central office through the second operating mode circuit 23, the second transformer 25, the telephone line interface 27 and the telephone line, and the downlink signal from the DSL central office is transmitted to the SOC chip 21 through the telephone line and the second operating mode circuit 23 after being transmitted to the telephone line interface 27, that is, the SOC chip 21 can receive the second signal output by the second operating mode circuit 23. In addition, after the downlink signal from the DSL office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is further transmitted to the SOC chip 21 through the first transformer 24 and the first operation mode circuit 22, that is, the SOC chip 21 can receive the first signal output by the first operation mode circuit 22. Since the DSL client device is currently configured to operate in the second operation mode, the SOC chip 21 processes the second signal output by the second operation mode circuit 23 and discards the first signal output by the first operation mode circuit 22 to ensure normal communication of the DSL client device.

The single board circuit of the DSL client device in this embodiment does not include a relay, and a transformer in the single board circuit is connected to an outdoor telephone line that is external to the DSL client device, and the transformer can achieve isolation between the primary side and the secondary side, and surge protection capability is higher than that of the relay, thereby improving protection performance of the DSL client device. In addition, the elimination of the relay can also reduce the size of the single-board circuit, which is beneficial to realizing the miniaturization design of DSL client equipment.

In one embodiment, the first operating mode circuit 22 includes: a first amplifier chip 221 and a first hybrid 222. The second operation mode circuit 23 includes: a second amplifier chip 231 and a second hybrid circuit 232. Fig. 6 shows a schematic structural diagram of a single-board circuit of a DSL client device according to this embodiment, where fig. 6 is a second schematic structural diagram of a single-board circuit of a DSL client device according to this embodiment.

Referring to fig. 6, the single board circuit of the present embodiment includes: SOC chip 21, third amplifier chip 223, third hybrid 224, fourth amplifier chip 233, fourth hybrid 234, first transformer 24, second transformer 25, telephone line interface 27. No relay is provided between the first transformer 24 and the telephone line interface 27, and no relay is provided between the second transformer 25 and the telephone line interface 27.

The SOC chip 21 is connected to an input terminal of the third amplifier chip 223, an output terminal of the third hybrid circuit 224, an input terminal of the fourth amplifier chip 233, and an output terminal of the fourth hybrid circuit 234. An output terminal of the third amplifier chip 223 and an input terminal of the third hybrid circuit 224 are both connected to the secondary winding port of the first transformer 24, and an output terminal of the third amplifier chip 223 is also connected to an input terminal of the third hybrid circuit 224. An output terminal of the fourth amplifier chip 233 and an input terminal of the fourth hybrid circuit 234 are connected to a secondary winding port of the second transformer 25, and an output terminal of the fourth amplifier chip 233 is also connected to an input terminal of the fourth hybrid circuit 234. The primary winding port of the first transformer 24 and the primary winding port of the second transformer 25 are both connected to a telephone line interface 27.

The third amplifier chip 223 in this embodiment may be a chip capable of amplifying the uplink signal output by the SOC chip 21 when the DSL client device operates in the first operating mode, for example, may be the first amplifier chip 221 in the single board circuit of the current DSL client device. The third hybrid circuit 224 in this embodiment may be a circuit capable of removing the uplink signal input into the third hybrid circuit 224 by the first transformer 24 when the DSL client device operates in the first operating mode, for example, the third hybrid circuit 224 may be the first hybrid circuit 222 in the single-board circuit of the current DSL client device.

The fourth amplifier chip 233 in this embodiment may be a chip capable of amplifying the uplink signal output by the SOC chip 21 when the DSL client device operates in the second operating mode, for example, may be the second amplifier chip 231 in the single board circuit of the current DSL client device. The fourth hybrid circuit 234 in this embodiment may be a circuit capable of removing the uplink signal input into the fourth hybrid circuit 234 by the second transformer 25 when the DSL client apparatus operates in the second operating mode, for example, the fourth hybrid circuit 234 may be the second hybrid circuit 232 in the single-board circuit of the current DSL client apparatus.

If the DSL client device operates in the first operation mode, the SOC chip 21 is in a state of being connected to the input terminal of the third amplifier chip 223 and disconnected from the input terminal of the fourth amplifier chip 233. At this time, the uplink signal output by the SOC chip 21 passes through the third amplifier chip 223, the first transformer 24, and the telephone line interface 27 in sequence, and is transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL central office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the first transformer 24 and the third hybrid circuit 224, that is, the SOC chip 21 can receive the first signal output by the third hybrid circuit 224. It can be understood that, based on the circuit configuration in fig. 6, the upstream signal is mixed in the signal input by the first transformer 24 to the third hybrid circuit 224, and the third hybrid circuit 224 removes the upstream signal in the signal input by the first transformer 24 to the third hybrid circuit 224 based on the upstream signal output by the third amplifier chip 223 to the third hybrid circuit 224, so as to obtain the downstream signal from the DSL office, and inputs the downstream signal to the SOC chip 21 for processing. In addition, after the downlink signal from the DSL office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is also transmitted to the SOC chip 21 through the second transformer 25 and the fourth hybrid circuit 234, that is, the SOC chip 21 can also receive the second signal output by the fourth hybrid circuit 234. It can be understood that, based on the circuit configuration of fig. 6, the signal input to the fourth hybrid circuit 234 by the second transformer 25 is mixed with the uplink signal, but since the SOC chip 21 is in a state disconnected from the input terminal of the fourth amplifier chip 233 and the output terminal of the fourth amplifier chip 233 has no signal output, the uplink signal is still mixed in the second signal output by the fourth hybrid circuit 234 and input to the SOC chip 21. Since the DSL client device is currently configured to operate in the first operating mode, the SOC chip 21 processes the first signal output by the third hybrid circuit 224 and discards the second signal output by the fourth hybrid circuit 234 to ensure proper communication of the DSL client device.

If the DSL client device operates in the second operation mode, the SOC chip 21 is in a state of being disconnected from the input terminal of the third amplifier chip 223 and being connected to the input terminal of the fourth amplifier chip 233. At this time, the uplink signal output by the SOC chip 21 passes through the fourth amplifier chip 233, the second transformer 25, and the telephone line interface 27 in sequence, and is transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the second transformer 25 and the fourth hybrid circuit 234, that is, the SOC chip 21 can receive the second signal output by the fourth hybrid circuit 234. It is understood that, based on the circuit configuration of fig. 6, the signal output from the secondary winding port of the second transformer 25 or the signal input to the fourth hybrid circuit 234 is mixed with the upstream signal, and therefore, the fourth hybrid circuit 234 removes the upstream signal from the signals input to the fourth hybrid circuit 234 based on the upstream signal output to the fourth hybrid circuit 234 by the fourth amplifier chip 233, and obtains the downstream signal from the DSL office, and inputs the downstream signal to the SOC chip 21 for processing. In addition, after the downlink signal from the DSL central office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is also transmitted to the SOC chip 21 through the first transformer 24 and the third hybrid circuit 224, that is, the SOC chip 21 can also receive the first signal output by the third hybrid circuit 224. It can be understood that, based on the circuit configuration of fig. 6, the signal input to the third hybrid circuit 224 by the first transformer 24 is mixed with the uplink signal, but since the SOC chip 21 is in a state disconnected from the input terminal of the third amplifier chip 223, no signal is output from the output terminal of the third amplifier chip 223, and therefore, the uplink signal is still mixed in the first signal output from the third hybrid circuit 224 and input to the SOC chip 21. Since the DSL client device is currently configured to operate in the second operating mode, in the case where the SOC chip 21 receives the first signal output by the third hybrid circuit 224 and the second signal output by the fourth hybrid circuit 234, the SOC chip 21 processes the second signal output by the fourth hybrid circuit 234, and discards the first signal output by the third hybrid circuit 224, so as to ensure normal communication of the DSL client device.

The single board circuit of the DSL client device in this embodiment improves the protection performance of the DSL client device and is favorable for implementing a miniaturized design of the DSL client device.

In order to reduce the complexity of the single board circuit structure and further reduce the size of the single board circuit, this embodiment is further improved on the basis of the embodiment shown in fig. 5. Fig. 7 is a third schematic structural diagram of a single-board circuit of DSL client equipment according to an embodiment of the present application, and referring to fig. 7, the single-board circuit according to the embodiment includes: SOC chip 21, first operation mode circuit 22, second operation mode circuit 23, third transformer 28, telephone line interface 27. No relay is provided between the third transformer 28 and the telephone line interface 27.

The third transformer 28 includes a primary coil, a first secondary coil and a second secondary coil, wherein the first secondary coil is wound around the periphery of the magnetic core, the primary coil is wound around the periphery of the first secondary coil, and the second secondary coil is wound around the periphery of the primary coil. In order to ensure the inductance of the primary coil, the primary coil comprises at least two series-connected sub-coils. In order to ensure the inductance of the first secondary coil, the first secondary coil comprises at least two series-connected sub-coils. In order to ensure the inductance of the second secondary coil, the second secondary coil comprises at least two series-connected sub-coils.

Fig. 8 is a schematic structural diagram of a third transformer according to an embodiment of the present application. As shown in fig. 8, the third transformer 28 includes a primary coil 81, a first secondary coil 82, and a second secondary coil 83. The primary coil 81 includes a first sub-coil N5 and a second sub-coil N6, the first sub-coil N5 and the second sub-coil N6 are connected in series, and one end 811 of the first sub-coil N5 and one end 812 of the second sub-coil N6 are primary coil ports. The first secondary coil 82 includes a third sub-coil N1 and a fourth sub-coil N2, the third sub-coil N1 and the fourth sub-coil N2 are connected in series, and one end 821 of the third sub-coil N1 and one end 822 of the fourth sub-coil N2 are first secondary coil ports. The second secondary coil 83 includes a fifth sub-coil N3 and a sixth sub-coil N4, the fifth sub-coil N3 and the sixth sub-coil N4 are connected in series, and one end 831 of the fifth sub-coil N3 and one end 832 of the sixth sub-coil N4 are second secondary coil ports.

In this embodiment, both the first operation mode circuit 22 and the second operation mode circuit 23 are connected to the SOC chip 21. A primary coil port of the third transformer 28 is connected to the telephone line interface 27, a first secondary coil port of the third transformer 28 is connected to the first operation mode circuit 22, and a second secondary coil port of the third transformer 28 is connected to the second operation mode circuit 23. That is, the third transformer 28 having two secondary coil ports is employed in the present embodiment instead of the first transformer 24 and the second transformer 25 in the embodiment shown in fig. 5.

If the DSL client device is configured to operate in the first operating mode, when the DSL client device communicates with the DSL central office, the uplink signal output by the SOC chip 21 is transmitted to the DSL central office through the first operating mode circuit 22, the third transformer 28, the telephone line interface 27 and the telephone line, and the downlink signal from the DSL central office is transmitted to the SOC chip 21 through the telephone line and the third transformer 28 and the first operating mode circuit 22 after being transmitted to the telephone line interface 27, that is, the SOC chip 21 can receive the first signal output by the first operating mode circuit 22. In addition, after the downlink signal from the DSL office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is further transmitted to the SOC chip 21 through the third transformer 28 and the second operation mode circuit 23, that is, the SOC chip 21 can receive the second signal output by the second operation mode circuit 23. Since the DSL client device is currently configured to operate in the first operating mode, the SOC chip 21 processes the first signal output by the first operating mode circuit 22 and discards the second signal output by the second operating mode circuit 23 to ensure normal communication of the DSL client device.

If the DSL client device is configured to operate in the second operating mode, when the DSL client device communicates with the DSL central office, the uplink signal output by the SOC chip 21 is transmitted to the DSL central office through the second operating mode circuit 23, the third transformer 28, the telephone line interface 27 and the telephone line, and the downlink signal from the DSL central office is transmitted to the SOC chip 21 through the telephone line and the second operating mode circuit 23 after being transmitted to the telephone line interface 27, that is, the SOC chip 21 can receive the second signal output by the second operating mode circuit 23. In addition, after the downlink signal from the DSL office is transmitted to the telephone line interface 27 through the telephone line, the downlink signal is further transmitted to the SOC chip 21 through the third transformer 28 and the first operating mode circuit 22, that is, the SOC chip 21 can receive the first signal output by the first operating mode circuit 22. Since the DSL client device is currently configured to operate in the second operation mode, the SOC chip 21 processes the second signal output by the second operation mode circuit 23 and discards the first signal output by the first operation mode circuit 22 to ensure normal communication of the DSL client device

The single board circuit of the DSL client device in this embodiment does not include a relay, and a transformer in the single board circuit is connected to an outdoor telephone line that is external to the DSL client device, and the transformer can achieve isolation between the primary side and the secondary side, and surge protection capability is higher than that of the relay, thereby improving protection performance of the DSL client device. Meanwhile, the single board circuit of the DSL client apparatus in this embodiment combines two transformers into one on the basis of removing the relay, which can further reduce the size of the single board circuit, and is favorable for implementing a miniaturized design of the DSL client apparatus.

In one embodiment, the first operating mode circuit 22 in the on-board circuit in the implementation shown in fig. 7 includes: a third amplifier chip 223 and a third hybrid circuit 224, the second operation mode circuit 23 includes: a fourth amplifier chip 233 and a fourth hybrid 234. Accordingly, a schematic structural diagram of a single-board circuit of a DSL client device in this embodiment may be as shown in fig. 9, where fig. 9 is a fourth schematic structural diagram of a single-board circuit of a DSL client device provided in this embodiment of the present application.

Referring to fig. 9, the single board circuit of the present embodiment includes: SOC chip 21, third amplifier chip 223, third hybrid 224, fourth amplifier chip 233, fourth hybrid 234, third transformer 28, telephone line interface 27. No relay is provided between the third transformer 28 and the telephone line interface 27.

The SOC chip 21 is connected to an input terminal of the third amplifier chip 223, an output terminal of the third hybrid circuit 224, an input terminal of the fourth amplifier chip 233, and an output terminal of the fourth hybrid circuit 234. An output terminal of the third amplifier chip 223 and an input terminal of the third hybrid circuit 224 are both connected to the first secondary coil port of the third transformer 28, and an output terminal of the third amplifier chip 223 is also connected to an input terminal of the third hybrid circuit 224. An output terminal of the fourth amplifier chip 233 and an input terminal of the fourth hybrid circuit 234 are connected to a second secondary coil port of the third transformer 28, and an output terminal of the fourth amplifier chip 233 is also connected to an input terminal of the fourth hybrid circuit 234. The primary winding port of the third transformer 28 is connected to the telephone line interface 27.

If the DSL client device operates in the first operation mode, the SOC chip 21 is in a state of being connected to the input terminal of the third amplifier chip 223 and disconnected from the input terminal of the fourth amplifier chip 233. At this time, the uplink signal output by the SOC chip 21 passes through the third amplifier chip 223, the first secondary winding and the primary winding of the third transformer 28, and the telephone line interface 27 in sequence, and is then transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the primary coil and the first secondary coil of the third transformer 28 and the third hybrid circuit 224, that is, the SOC chip 21 can receive the first signal output by the third hybrid circuit 224. It can be understood that, based on the circuit configuration in fig. 9, the signal input to the third hybrid circuit 224 by the third transformer 28 is mixed with the upstream signal, and therefore, the third hybrid circuit 224 removes the upstream signal from the signal input to the third hybrid circuit 224 by the third transformer 28 based on the upstream signal output to the third hybrid circuit 224 by the third amplifier chip 223, and obtains the downstream signal from the DSL office, and inputs the downstream signal to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, the downstream signal is also transmitted to the SOC chip 21 via the primary winding and the second secondary winding of the third transformer 28 and the fourth hybrid circuit 234, that is, the SOC chip 21 can receive the second signal output by the fourth hybrid circuit 234. It can be understood that, based on the circuit configuration of fig. 8, the signal input to the fourth hybrid circuit 234 by the third transformer 28 is mixed with the uplink signal, but since the SOC chip 21 is in a state disconnected from the input terminal of the fourth amplifier chip 233 and the output terminal of the fourth amplifier chip 233 has no signal output, the uplink signal is still mixed in the second signal output by the fourth hybrid circuit 234 and input to the SOC chip 21. Since the DSL client device is currently configured to operate in the first operating mode, the SOC chip 21 processes the first signal output by the third hybrid circuit 224 and discards the second signal output by the fourth hybrid circuit 234 to ensure proper communication of the DSL client device.

If the DSL client device operates in the second operation mode, the SOC chip 21 is in a state of being disconnected from the input terminal of the third amplifier chip 223 and being connected to the input terminal of the fourth amplifier chip 233. At this time, the uplink signal output by the SOC chip 21 passes through the fourth amplifier chip 233, the second secondary coil and the primary coil of the third transformer 28, and the telephone line interface 27 in sequence, and is then transmitted to the telephone line, and finally transmitted to the DSL office. The downlink signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, and then transmitted to the SOC chip 21 via the primary coil and the second secondary coil of the third transformer 28 and the fourth hybrid circuit 234, that is, the SOC chip 21 can receive the second signal output by the fourth hybrid circuit 234. It can be understood that, based on the circuit configuration of fig. 9, the signal input to the fourth hybrid circuit 234 by the third transformer 28 is mixed with the upstream signal, and therefore, the fourth hybrid circuit 234 removes the upstream signal from the signal input to the fourth hybrid circuit 234 based on the upstream signal output to the fourth hybrid circuit 234 by the fourth amplifier chip 233, and obtains the downstream signal from the DSL office, and inputs the downstream signal to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office is transmitted to the telephone line interface 27 via the telephone line, the downstream signal is also transmitted to the SOC chip 21 via the primary winding and the first secondary winding of the third transformer 28 and the third hybrid circuit 224, that is, the SOC chip 21 can also receive the first signal output by the third hybrid circuit 224. It can be understood that, based on the circuit configuration of fig. 9, the signal input to the third hybrid circuit 224 by the third transformer 28 is mixed with the uplink signal, but since the SOC chip 21 is in a state of being disconnected from the input terminal of the third amplifier chip 223, no signal is output from the output terminal of the third amplifier chip 223, and therefore, the uplink signal is still mixed in the first signal output from the third hybrid circuit 224 and input to the SOC chip 21. Since the DSL client device is currently configured to operate in the second operating mode, in the case where the SOC chip 21 receives the first signal output by the third hybrid circuit 224 and the second signal output by the fourth hybrid circuit 234, the SOC chip 21 processes the second signal output by the fourth hybrid circuit 234, and discards the first signal output by the third hybrid circuit 224, so as to ensure normal communication of the DSL client device.

In yet another embodiment, the first operating mode circuit 22 in the on-board circuit in the implementation shown in fig. 7 includes: a third amplifier chip 223 and a third hybrid circuit 224, the second operation mode circuit 23 includes: a fourth amplifier chip 233, a fourth hybrid 234, and an isolation circuit 29. Accordingly, a schematic structural diagram of a single-board circuit of a DSL client device in this embodiment may be as shown in fig. 10, where fig. 10 is a fifth schematic structural diagram of a single-board circuit of a DSL client device provided in this embodiment of the present application.

Referring to fig. 10, the single board circuit of the present embodiment includes: SOC chip 21, third amplifier chip 223, third hybrid 224, fourth amplifier chip 233, fourth hybrid 234, isolation circuit 29, third transformer 28, telephone line interface 27. No relay is provided between the third transformer 28 and the telephone line interface 27.

The SOC chip 21 is connected to an input terminal of the third amplifier chip 223, an output terminal of the third hybrid circuit 224, an input terminal of the fourth amplifier chip 233, and an output terminal of the fourth hybrid circuit 234. An output terminal of the third amplifier chip 223 and an input terminal of the third hybrid circuit 224 are both connected to the first secondary coil port of the third transformer 28, and an output terminal of the third amplifier chip 223 is also connected to an input terminal of the third hybrid circuit 224. The output terminal of the fourth amplifier chip 233 and the isolation circuit 29 are both connected to the second secondary coil port of the third transformer 28, the output terminal of the fourth amplifier chip 233 is further connected to the isolation circuit 29, and the isolation circuit 29 is further connected to the input terminal of the fourth hybrid circuit 234. The primary winding port of the third transformer 28 is connected to the telephone line interface 27.

This embodiment is suitable for the case where the signal transmission rate in the first operation mode is lower than the signal transmission rate in the second operation mode, the operation bandwidth of the first operation mode circuit 22 is lower than the operation bandwidth of the second operation mode circuit 23, and the operation bandwidth of the second operation mode circuit 23 is larger. In this case, due to the above-mentioned structure of the third transformer 28, the signal on the first secondary side of the third transformer 28 may affect the signal on the second secondary side of the third transformer 28, and then, when the DSL client device is configured to operate in the second operation mode, a large noise may exist in the downstream signal received by the SOC chip 21. In order to remove noise in the downstream signal received by the SOC chip 21 when the DSL client device is configured to operate in the second operation mode, an isolation circuit 29 may be provided between the fourth hybrid circuit 234 and the second secondary coil port of the third transformer 28 to remove the signal on the first secondary coil side of the third transformer 28 for the purpose of removing noise in the downstream signal received by the SOC chip 21. That is, the isolation circuit 29 is used to remove the signal on the first secondary winding side of the third transformer 28 mixed in the signal input to the isolation circuit 29.

In one approach, the isolation circuit 29 may include: a first capacitor 291, a second capacitor 292, a third capacitor 293, a fourth capacitor 294 and an inductor 295; a first end of the first capacitor 291 and a first end of the third capacitor 293 are both connected to the fourth hybrid circuit, a second end of the first capacitor 291 is connected to a first end of the second capacitor 292, a second end of the second capacitor 292 is connected to one of the second secondary ports of the third transformer 28, a second end of the third capacitor 293 is connected to a first end of the fourth capacitor 294, and a second end of the fourth capacitor 294 is connected to the other of the second secondary ports of the third transformer 28; a first terminal of the inductor 295 is connected to the second terminal of the first capacitor 291 and the first terminal of the second capacitor 292, respectively, and a second terminal of the inductor 295 is connected to the second terminal of the third capacitor 293 and the first terminal of the fourth capacitor 294, respectively. A schematic diagram of an isolation circuit 29 can be seen in fig. 11.

It is understood that the structure of the isolation circuit described above is an example of the structure of the isolation circuit, and the isolation circuit may also be another circuit structure capable of filtering noise.

The working principle of the single board circuit in this embodiment is similar to that of the single board circuit in the previous embodiment, and is not described herein again.

The single board circuit of the DSL client device in this embodiment improves the protection performance of the DSL client device and is favorable for implementing a miniaturized design of the DSL client device. Meanwhile, the single board circuit in this embodiment may enable, under the condition that the signal transmission rate in the first working mode is lower than the signal transmission rate in the second working mode, the working bandwidth of the first working mode circuit is lower than the working bandwidth of the second working mode circuit, and the working bandwidth of the second working mode circuit is larger, to make the noise in the downlink signal received by the SOC chip in the DSL client device operating in the second working mode smaller, and to ensure the quality of the downlink signal received by the SOC chip, so that the DSL client device and the DSL office can communicate normally.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It should be appreciated that reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the various embodiments are not necessarily referring to the same embodiment throughout the specification. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should also be understood that, in this application, "when …", "if" and "if" all refer to an action that is taken by a device in an objective situation, and are not intended to be limiting, nor do they require a certain degree of judgment in order for the device to be implemented, nor do they imply that there are other limitations.

Reference in the present application to an element using the singular is intended to mean "one or more" rather than "one and only one" unless specifically stated otherwise. In the present application, unless otherwise specified, "at least one" is intended to mean "one or more" and "a plurality" is intended to mean "two or more".

In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A can be singular or plural, and B can be singular or plural.

The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Herein, the term "at least one of … …" or "at least one of … …" means all or any combination of the listed items, e.g., "at least one of A, B and C", may mean: the compound comprises six cases of separately existing A, separately existing B, separately existing C, simultaneously existing A and B, simultaneously existing B and C, and simultaneously existing A, B and C, wherein A can be singular or plural, B can be singular or plural, and C can be singular or plural.

It should be understood that in the embodiments of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Claims

1. A single board circuit for a DSL client device, the single board circuit comprising: the system comprises a transformer, a telephone line interface, a first working mode circuit, a second working mode circuit and an SOC chip; the transformer includes: a primary coil, a first secondary coil and a second secondary coil;

the SOC chip is connected to the first operating mode circuit and the second operating mode circuit, the first operating mode circuit is connected to a first secondary coil port of the transformer, the second operating mode circuit is connected to a second secondary coil port of the transformer, and a primary coil port of the transformer is connected to a telephone line interface, so that when the DSL client device operates in the first operating mode or in the second operating mode, the DSL client device can transmit a downlink signal from the DSL office to the SOC chip and transmit an uplink signal output from the SOC chip to the DSL office.

2. The method of claim 1, wherein the primary coil comprises at least two coils connected in series.

3. A method according to claim 1 or 2, wherein the first secondary coil comprises at least two coils connected in series.

4. A method according to any of claims 1 to 3, wherein the second secondary winding comprises at least two windings connected in series.

5. The single-board circuit according to any one of claims 1 to 4,

when the DSL client device operates in a first operating mode, the SOC chip is configured to process a first signal input by the first operating mode circuit, and discard a second signal input by the second operating mode circuit;

when the DSL client device operates in the second operating mode, the SOC chip is configured to process the second signal input by the second operating mode circuit, and discard the first signal input by the first operating mode circuit.

6. The single board circuit according to any one of claims 1 to 5, wherein the first operating mode circuit comprises: the SOC chip comprises a first amplifier chip and a first hybrid circuit, wherein the input end of the first amplifier chip and the output end of the first hybrid circuit are both connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are both connected with the port of the first secondary coil of the transformer, and the output end of the first amplifier chip is also connected with the input end of the first hybrid circuit;

when the DSL client device operates in the first operating mode, the first amplifier chip is configured to amplify an uplink signal output by the SOC chip, and the first hybrid circuit is configured to remove the uplink signal input by the transformer to the first hybrid circuit to obtain a downlink signal from the DSL office.

7. The single board circuit according to any one of claims 1 to 6, wherein the second operation mode circuit comprises: the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are both connected with the port of the second secondary coil of the transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit;

when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the second hybrid circuit is configured to remove the uplink signal input by the transformer to the second hybrid circuit to obtain a downlink signal from the DSL office.

8. The single board circuit according to any one of claims 1 to 6, wherein the second operation mode circuit comprises: a second amplifier chip, a second hybrid circuit, and an isolation circuit;

the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip, the output end of the second amplifier chip and the isolation circuit are both connected with the port of the second secondary coil of the transformer, the input end of the second hybrid circuit is connected with the isolation circuit, and the output end of the second amplifier chip is also connected with the isolation circuit;

when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, the isolation circuit is configured to remove a signal on the first secondary winding side of the transformer included in a signal input to the isolation circuit by the transformer, and the second hybrid circuit is configured to remove the uplink signal input to the second hybrid circuit by the isolation circuit to obtain a downlink signal from the DSL office.

9. The single board circuit of claim 8, wherein the isolation circuit comprises: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an inductor;

a first end of the first capacitor and a first end of the third capacitor are both connected with the second hybrid circuit, a second end of the first capacitor is connected with a first end of the second capacitor, a second end of the second capacitor is connected with one of the second secondary ports, a second end of the third capacitor is connected with a first end of the fourth capacitor, and a second end of the fourth capacitor is connected with the other of the second secondary ports;

the first end of the inductor is connected with the second end of the first capacitor and the first end of the second capacitor respectively, and the second end of the inductor is connected with the second end of the third capacitor and the first end of the fourth capacitor respectively.

10. A single board circuit for a digital subscriber line, DSL, client device, comprising: the system comprises a telephone line interface, a first transformer, a second transformer, a first working mode circuit, a second working mode circuit and an SOC chip;

the SOC chip is connected to the first operating mode circuit and the second operating mode circuit, the first operating mode circuit is connected to the secondary coil port of the first transformer, the second operating mode circuit is connected to the secondary coil port of the second transformer, and both the primary coil port of the first transformer and the primary coil port of the second transformer are connected to a telephone line interface, so that when the DSL client device operates in the first operating mode or in the second operating mode, the DSL client device can transmit a downlink signal from the DSL central office to the SOC chip and transmit an uplink signal output from the SOC chip to the DSL central office.

11. The single board circuit of claim 10,

12. The single board circuit according to claim 10 or 11, wherein the first operating mode circuit comprises: the SOC chip comprises a first amplifier chip and a first hybrid circuit, wherein the input end of the first amplifier chip and the output end of the first hybrid circuit are both connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are both connected with the secondary coil port of the first transformer, and the output end of the first amplifier chip is also connected with the input end of the first hybrid circuit;

when the DSL client device operates in the first operating mode, the first amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the first hybrid circuit is configured to remove the uplink signal input by the first transformer to the first hybrid circuit to obtain the downlink signal from the DSL office.

13. The single board circuit according to any one of claims 10 to 12, wherein the second operation mode circuit comprises: the input end of the second amplifier chip and the output end of the second hybrid circuit are both connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are both connected with the secondary coil port of the second transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit;

when the DSL client device operates in the second operating mode, the second amplifier chip is configured to amplify the uplink signal output by the SOC chip, and the second hybrid circuit is configured to remove the uplink signal input by the second transformer to the second hybrid circuit to obtain the downlink signal from the DSL office.

14. A transformer, comprising: the magnetic core comprises a primary coil, a first secondary coil and a second secondary coil, wherein the first secondary coil is wound around the periphery of the magnetic core, the primary coil is wound around the periphery of the first secondary coil, and the second secondary coil is wound around the periphery of the primary coil.

15. The method of claim 14, wherein the primary coil comprises at least two coils, the at least two coils being connected in series.

16. The method of claim 14 or 15, wherein the first secondary coil comprises at least two coils, the at least two coils being connected in series.

17. A method according to any one of claims 14 to 16, wherein the second secondary winding comprises at least two windings, the at least two windings being connected in series.

18. A DSL client device comprising the on-board circuit of any of claims 1 to 9.

19. A DSL client device comprising the on-board circuit of any of claims 10 to 12.