CN113382121B

CN113382121B - Single board circuit, transformer and DSL client device

Info

Publication number: CN113382121B
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: 2023-07-07
Anticipated expiration: 2040-03-09
Also published as: CN113382121A

Abstract

The embodiment of the application provides a single board circuit, a transformer and DSL client equipment, wherein the single board circuit comprises: 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 an SOC chip, a first working mode circuit, a second working mode circuit, a first secondary coil port, a second working mode circuit, 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 DSL client equipment 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 protection performance of DSL client equipment is improved.

Description

Single board circuit, transformer and DSL client device

Technical Field

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

Background

The single board circuit of the digital subscriber line (Digital Subscriber Line, DSL for short) terminal comprises a System-on-a-Chip (SOC) Chip and a peripheral analog circuit connected with the SOC Chip. At present, the aim that DSL client equipment can be switched between two working modes is achieved 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 protection 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 for 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 SOC chip is connected with the first working mode circuit and the second working mode circuit, the first working mode circuit is connected with a first secondary coil port of the transformer, the second working mode circuit is connected with a second secondary coil port of the transformer, the primary coil port of the transformer is connected with a telephone line interface, so that when the DSL client device works in a first working mode or a second working mode, the downstream signal from the DSL local side can be transmitted to the SOC chip, and the upstream signal output by the SOC chip can be transmitted to the DSL local side.

In the scheme, the single-board circuit of the DSL client device does not comprise a relay, the transformer in the single-board circuit is connected with the telephone line which is arranged outside the DSL client device and is arranged outside the DSL client device, the transformer can realize the isolation of the primary side and the secondary side, and the surge protection capacity 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 device in the embodiment combines two transformers into one on the basis of eliminating the relay, so that the size of the single-board circuit can be further reduced, and the miniaturized design of the DSL client device is facilitated.

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 inductance of the first secondary coil of the transformer can be guaranteed through the scheme.

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

The inductance of the second secondary coil of the transformer can be guaranteed through the scheme.

In a possible implementation manner, when the DSL client device operates in a first operation mode, the SOC chip is configured to process a first signal input by the first operation mode circuit and discard a second signal input by the second operation mode circuit; and when the DSL client device works in the second working mode, the SOC chip is used for processing the second signal input by the second working mode circuit and discarding the first signal input by the first working mode circuit.

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

In one possible implementation, the first operating mode circuit includes: the input end of the first amplifier chip and the output end of the first hybrid circuit are connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are connected with the first secondary coil port 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 works in the first working 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 into 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 downstream signal from the DSL local side can be transmitted to the SOC chip and the upstream signal output by the SOC chip can be transmitted to the DSL local side.

In one possible implementation, the second operation mode circuit includes: the input end of the second amplifier chip and the output end of the second hybrid circuit are connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are connected with the second secondary coil port of the transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit; and when the DSL client device works in the second working mode, the second amplifier chip is used for amplifying the uplink signal output by the SOC chip, and the second hybrid circuit is used for removing the uplink signal input by the transformer into the second hybrid circuit to obtain the downlink signal from the DSL local side.

The scheme provides a specific implementation of the second working mode circuit, and the second working mode circuit in the scheme can ensure that when DSL client equipment works in 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.

In one possible implementation, the second operation 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 connected with the SOC chip, the output end of the second amplifier chip and the isolation circuit are connected with the second secondary coil port 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 works in the second working mode, the second amplifier chip is configured to amplify an uplink signal output by the SOC chip, the isolation circuit is configured to remove a signal on a first secondary winding side of the transformer included in a signal input by the transformer to the isolation circuit, and the second hybrid circuit is configured to remove an uplink signal input by the isolation circuit to the second hybrid circuit to obtain a downlink signal from the DSL office.

The scheme provides a specific implementation of the second working mode circuit, and the second working mode circuit in the scheme can ensure that when DSL client equipment works in 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. In addition, the isolation circuit can remove the signal on the first secondary coil side of the transformer mixed in the signal input to the isolation circuit, and normal communication of the DSL terminal equipment is ensured.

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

The scheme gives a specific implementation of the isolation circuit.

In a second aspect, an embodiment of the present application provides a single board circuit for a DSL client device of a digital subscriber line, 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 system comprises a first working mode circuit, a second working mode circuit, a first transformer, a second transformer, a first working mode circuit, a second working mode circuit, a telephone line interface and a DSL client device, wherein the first working mode circuit is connected with the second working mode circuit, the first working mode circuit is connected with a secondary coil port of the first transformer, the second working mode circuit is connected with a secondary coil port of the second transformer, and a primary coil port of the first transformer and a primary coil port of the second transformer are 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 terminal can be transmitted to the SOC chip, and uplink signals output by the SOC chip can be transmitted to the DSL local terminal.

In the scheme, the single-board circuit of the DSL client device does not comprise a relay, the transformer in the single-board circuit is connected with the telephone line which is arranged outside the DSL client device and is arranged outside the DSL client device, the transformer can realize isolation of a primary side and a secondary side, and the surge protection capacity is higher than that of the relay, so that the protection performance of the DSL client device is improved. In addition, the relay is removed, so that the size of a single-board circuit can be reduced, and the miniaturized design of DSL client equipment is facilitated.

In one possible implementation, the first operating mode circuit includes: the input end of the first amplifier chip and the output end of the first hybrid circuit are connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are 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 works in a first working mode, the first amplifier chip is used for amplifying an uplink signal output by the SOC chip, and the first hybrid circuit is used for removing the uplink signal input by the first transformer into the first hybrid circuit to obtain a downlink signal from the DSL local side.

In one possible implementation, the second operation mode circuit includes: the input end of the second amplifier chip and the output end of the second hybrid circuit are connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are 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 works in the second working 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 into the second hybrid circuit, so as to obtain a downlink signal from the DSL office.

In a third aspect, embodiments of the present application provide a transformer, including: the magnetic core comprises a magnetic core, a primary coil, a first secondary coil and a second secondary coil, wherein the first secondary coil surrounds the periphery of the magnetic core, the primary coil surrounds the periphery of the first secondary coil, and the second secondary coil surrounds 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 downstream signal from the DSL local side can be transmitted to the SOC chip and the upstream signal output by the SOC chip can be transmitted to the DSL local side.

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

In a fourth aspect, embodiments of the present application provide a DSL client device, including a single board as described in the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, embodiments of the present application provide a DSL client device, including a single board circuit as described in the second aspect or any possible implementation manner of the second aspect.

In the application, the single-board circuit of the DSL client device does not comprise a relay, the transformer in the single-board circuit is connected with the telephone line which is arranged outside the DSL client device and is arranged outside the DSL client device, the transformer can realize isolation of the primary side and the secondary side, and the surge protection capacity 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 device in the embodiment removes the relay, so that the size of the single board circuit can be reduced, and the miniaturized design of the DSL client device is facilitated.

Drawings

Fig. 1 is a system architecture for DSL

Fig. 2 is a schematic diagram of a single board circuit of a DSL client device;

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

fig. 4 is a schematic diagram of a first transformer in a single board circuit of a DSL client device;

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

fig. 7 is a schematic diagram III 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 disclosure;

fig. 9 is a 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 schematic 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 transmission medium. DSL includes Asymmetric DSL (VDSL), ultra-high-speed DSL (Very High Speed DSL, VDSL), and G.FAST. Wherein G in g.fast represents ITU-T G series recommendations, fast in g.fast is an abbreviation for Fast access user terminal (Fast access to subscriber terminals).

Fig. 1 is a system architecture for DSL. Referring to fig. 1, a DSL terminal is connected to a DSL customer premise equipment (DSL CPE), and 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 referred to as an upstream signal, and the signal sent by the DSL office to the DSL terminal is referred to as a downstream signal.

The DSL terminal may be, for example, a personal computer (Personal Computer, abbreviated as PC); the DSL client device may be a modem (modem).

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

For a better understanding of the present application, a description will first be given of a single board circuit of an existing DSL client device.

Fig. 2 is a schematic diagram of a single board circuit of a DSL client device. Referring to fig. 2, the single board circuit of the dsl client device 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 operating mode circuit 22, a second operating 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 to an external telephone line for the purpose of enabling DSL client devices to communicate 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 the first transformer 24, and the second operation mode circuit 23 is connected to a secondary winding port of the second transformer 25. The primary winding port of the first transformer 24 and the primary winding 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 on with the first operation mode circuit 22 and off with the second operation mode circuit 23, and the relay 26 is in a state of being on with the primary winding port of the first transformer 24 and off with the primary winding port of the second transformer 25. At this time, when the DSL client device communicates with the DSL local-end, the uplink signal sent by the SOC chip 21 is transmitted to the DSL local-end through the first operation 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 local-end is transmitted to the telephone line interface 27 through the telephone line, and is transmitted to the SOC chip 21 through the relay 26, the first transformer 24, the first operation mode circuit 22, and the first operation mode circuit 22.

If the user needs to change, the user wants the DSL client device to operate in the second operation mode, in one mode, the DSL office sends a switching command to the DSL client device, the switching command is transmitted to the SOC chip 21 through the relay 26, the first transformer 24 and the first operation 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 through a General-purpose input/output (GPIO) pin, so that the relay 26 is controlled 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 local-end, the uplink signal output by the SOC chip 21 is transmitted to the DSL local-end through 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 local-end is transmitted to the telephone line interface 27 through the telephone line, and is transmitted to the SOC chip 21 through the relay 26, the second transformer 25, and the second operation mode circuit 23.

The signal transmission rates of the first working mode and the second working mode are different, for example, the first working mode can be an ADSL working mode or a VDSL working mode, and the second working mode can be a g.fast working mode.

In one approach, the first operating mode circuit 22 may include a first amplifier chip 221 and a first hybrid circuit 222. The second operation mode circuit 23 may include a second amplifier chip 231 and a second hybrid circuit 232. The single board circuit of the corresponding DSL client device may be shown in fig. 3, and fig. 3 is a schematic diagram two of the single board circuit of the current DSL client device. Referring to fig. 3, the single board circuit of the dsl client device includes an SOC chip 21, a first amplifier chip 221, a first hybrid 222, a second amplifier chip 231, a second hybrid 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 conversion 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 of the first amplifier chip 221 and the input of the first hybrid 222 are both connected to the secondary winding port of the first transformer 24, and the output of the first amplifier chip 221 is also connected to the input of the first hybrid 222. The output of the second amplifier chip 231, the input of the second hybrid 232 and the secondary winding port of the second transformer 25 are connected, and the output of the second amplifier chip 231 is also connected to the input of the second hybrid 232. The primary winding port of the first transformer 24 and the primary winding 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 is operating in the first operation mode, the SOC chip 21 is in a state of being on to the input of the first amplifier chip 221 and off to the input of the second amplifier chip 231, and the relay 26 is in a state of being on to the primary winding port of the first transformer 24 and off to the primary winding port of the second transformer 25. At this time, the uplink signal sent by the SOC chip 21 is sequentially transmitted to the telephone line through the first amplifier chip 221, the first transformer 24, the relay 26, and the telephone line interface 27, and finally transmitted to the DSL office. Downstream signals from the DSL office end are transmitted to the SOC chip 21 via the relay 26, the first transformer 24, and the first hybrid circuit 222 via the telephone line and into the telephone line interface 27. It can be understood that, based on the circuit structure of fig. 3, the signal input to the first hybrid circuit 222 by the first transformer 24 is mixed with an uplink signal, and the uplink signal in the signal input to the first hybrid circuit 222 by the first hybrid circuit 222 is removed by the first transformer 24 based on the uplink signal output to the first hybrid circuit 222 by the first amplifier chip 221, so as to obtain a downlink signal from the DSL local side for processing by the SOC chip 21.

If the DSL client device is operating 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 winding port of the first transformer 24 and being connected to the primary winding port of the second transformer 25. At this time, the uplink signal output by the SOC chip 21 is sequentially transmitted to the telephone line through the second amplifier chip 231, the second transformer 25, the relay 26, and the telephone line interface 27, and finally to the DSL office. Downstream signals from the DSL office end are transmitted to the SOC chip 21 via the relay 26, the second transformer 25, and the second hybrid circuit 232 via the telephone line and into the telephone line interface 27. It can be understood that, based on the circuit structure of fig. 3, the signal input to the second hybrid circuit 232 by the second transformer 25 is mixed with an uplink signal, and the uplink signal in the signal input to the second hybrid circuit 232 by the second hybrid circuit 232 is removed from the signal input to the second hybrid circuit 232 by the second transformer 25 based on the uplink signal output to the second hybrid circuit 232 by the second hybrid circuit 232, so as to obtain a downlink signal from the DSL local side for the SOC chip 21 to process.

Fig. 4 is a schematic diagram of a first transformer in a single board circuit of a 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 facing a direction of a relay 26, and is connected to an external telephone line; the secondary side of the first transformer 24 is the 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 as to improve the surge protection capability of the secondary side of the first transformer 24, and also can inhibit external common mode noise from entering the inside of the 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 can inhibit external common mode noise from entering the inside of the single board of the DSL client apparatus.

In summary, in the single board circuit of the current DSL client device, a relay is required to be used to achieve the purpose that the DSL client device can switch between two working modes, so as to meet different requirements of users. Since the relay is connected to a telephone line that is external to the DSL client device and is located outdoors, the protection performance of the DSL client device is limited by the lightning protection performance of the relay, i.e. by the surge protection capability of the relay. In addition, the control module and the contact module inside the relay are filled with inert gas, and the preparation process is complex and has high cost.

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 that is external to the DSL client device and is disposed outside, and the transformer can realize 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 not limited to the relay, and the protection performance of the DSL client device is improved. However, the relay has the following technical problems after being removed: no matter what working mode the DSL client device is configured to work in, the downlink signal from the DSL local side is sent to the SOC chip through the first transformer and the first working mode circuit, and is sent to the SOC chip through 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 influences the normal operation of the SOC chip, and the normal communication of the DSL client device is influenced. 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 a correct signal, and the other signal is discarded, and the technical scheme of improving the protection performance of DSL client equipment by removing the relay of the single-board circuit can be realized.

The following describes in detail the single board circuit of the DSL client device provided in the present application.

Fig. 5 is a schematic structural diagram of a single board circuit of a DSL client device provided in an embodiment of the present application, referring to fig. 5, the single board circuit of the embodiment includes: the system comprises an SOC chip 21, a first working mode circuit 22, a second working mode circuit 23, a first transformer 24, a second transformer 25 and a 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.

The first operating mode circuit 22 and the second operating 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 a telephone line interface 27. The second operating mode circuit 23 is also connected to a secondary winding port of a second transformer 25, the primary winding port of the second transformer 25 being connected to a 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 of enabling the DSL client device to communicate with the DSL office via the telephone line.

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

If the DSL client device is configured to operate in the second operation mode, when the DSL client device communicates with the DSL local-end, the upstream signal output by the SOC chip 21 is transmitted to the DSL local-end through the second operation mode circuit 23, the second transformer 25, the telephone line interface 27, and the telephone line, and the downstream signal from the DSL local-end is transmitted to the SOC chip 21 through the second transformer 25 and the second operation mode circuit 23 after being transmitted to the telephone line interface 27 through the telephone line, that is, the SOC chip 21 can receive the second signal output by the second operation mode circuit 23. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream 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 the embodiment does not comprise a relay, the transformer in the single board circuit is connected with the telephone line which is arranged outside the DSL client device and is arranged outside the DSL client device, the transformer can realize isolation of the primary side and the 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 relay is removed, so that the size of a single-board circuit can be reduced, and the miniaturized design of DSL client equipment is facilitated.

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 232. The schematic structural diagram of the single board circuit corresponding to the DSL client device in this embodiment may be shown in fig. 6, and fig. 6 is a schematic structural diagram two of the single board circuit of the DSL client device provided in the embodiment of the present application.

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, and 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. The output of the third amplifier chip 223 and the input of the third hybrid 224 are both connected to the secondary winding port of the first transformer 24, and the output of the third amplifier chip 223 is also connected to the input of the third hybrid 224. The output of the fourth amplifier chip 233, the input of the fourth hybrid 234 and the secondary winding port of the second transformer 25 are connected, and the output of the fourth amplifier chip 233 is also connected to the input of the fourth hybrid 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 upstream signal output by the SOC chip 21 when the DSL client device is operating in the first operation mode, for example, may be the first amplifier chip 221 in the single board circuit of the DSL client device. The third hybrid 224 in this embodiment may be a circuit capable of removing an upstream signal input to the third hybrid 224 by the first transformer 24 when the DSL client device is operating in the first operation mode, for example, the third hybrid 222 in a single board circuit of the DSL client device at present.

The fourth amplifier chip 233 in this embodiment may be a chip capable of amplifying the upstream signal output by the SOC chip 21 when the DSL client device is operating in the second operation mode, for example, may be the second amplifier chip 231 in the single board circuit of the DSL client device at present. The fourth hybrid 234 in this embodiment may be a circuit capable of removing the uplink signal input to the fourth hybrid 234 by the second transformer 25 when the DSL client device is operating in the second operation mode, for example, the fourth hybrid 232 in the single board of the DSL client device at present.

If the DSL client device is operating in the first operation mode, the SOC chip 21 is in a state of being on to the input of the third amplifier chip 223 and off to the input of the fourth amplifier chip 233. At this time, the uplink signal output from the SOC chip 21 is sequentially transmitted to the telephone line via the third amplifier chip 223, the first transformer 24, and the telephone line interface 27, and finally to the DSL office. The downstream signal from the DSL office end is transmitted to the SOC chip 21 through the first transformer 24 and the third hybrid circuit 224 after being transmitted to the telephone line interface 27 through the telephone line, 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 structure of fig. 6, the upstream signal is mixed in the signal input to the third hybrid circuit 224 by the first transformer 24, and the upstream signal in the signal input to the third hybrid circuit 224 by the third hybrid circuit 224 is removed based on the upstream signal output to the third hybrid circuit 224 by the third amplifier chip 223, so that the downstream signal from the DSL office is obtained and input to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream signal is further 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 is 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 upstream signal, but since the SOC chip 21 is in a state of being disconnected from the input terminal of the fourth amplifier chip 233, the output terminal of the fourth amplifier chip 233 has no signal output, and thus the second signal output and input to the SOC chip 21 by the fourth hybrid circuit 234 is still mixed with the upstream signal. Since the DSL client device is currently configured to operate in the first mode of operation, the SOC chip 21 processes the first signal output by the third hybrid 224 and discards the second signal output by the fourth hybrid 234 to ensure proper communication of the DSL client device.

If the DSL client device is operating in the second operation mode, the SOC chip 21 is in a state of being disconnected from the input of the third amplifier chip 223 and being connected to the input of the fourth amplifier chip 233. At this time, the uplink signal output from the SOC chip 21 is sequentially transmitted to the telephone line via the fourth amplifier chip 233, the second transformer 25, and the telephone line interface 27, and finally to the DSL office. The downstream signal from the DSL office end is transmitted to the phone line interface 27 through the phone line, and then transmitted to the SOC chip 21 through 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. As can be understood, 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 uplink signal, and therefore, the fourth hybrid circuit 234 removes the uplink signal from the signal input to the fourth hybrid circuit 234 based on the uplink signal output to the fourth hybrid circuit 234 by the fourth amplifier chip 233, obtains the downlink signal from the DSL office end, and inputs the downlink signal to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream signal is further 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 will be understood that, based on the circuit structure of fig. 6, the upstream signal is mixed in the signal input to the third mixing circuit 224 by the first transformer 24, 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 thus the upstream signal is still mixed in the first signal output and input to the SOC chip 21 by the third mixing circuit 224. Since the DSL client device is currently configured to operate in the second operation mode, in the case that the SOC chip 21 receives the first signal output by the third hybrid 224 and the second signal output by the fourth hybrid 234, the SOC chip 21 processes the second signal output by the fourth hybrid 234 and discards the first signal output by the third hybrid 224 to ensure normal communication of the DSL client device.

The single board circuit of the DSL client device in the embodiment improves the protection performance of the DSL client device and is beneficial to realizing the miniaturization design of the DSL client device.

In order to reduce the complexity of the on-board circuit structure and further reduce the size of the on-board circuit, the present embodiment is further improved on the basis of the embodiment shown in fig. 5. Fig. 7 is a schematic diagram III of a single board circuit of a DSL client device provided in an embodiment of the present application, referring to fig. 7, the single board circuit in this embodiment includes: the SOC chip 21, the first operation mode circuit 22, the second operation mode circuit 23, the third transformer 28, and the 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, the first secondary coil surrounds the periphery of the magnetic core, the primary coil surrounds the periphery of the first secondary coil, and the second secondary coil surrounds the periphery of the primary coil. In order to ensure the inductance of the primary coil, the primary coil comprises at least two sub-coils connected in series. In order to ensure the inductance of the first secondary coil, the first secondary coil comprises at least two sub-coils connected in series. In order to ensure the inductance of the second secondary coil, the second secondary coil comprises at least two sub-coils connected in series.

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 being connected in series, one end 811 of the first sub-coil N5 and one end 812 of the second sub-coil N6 being 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, the first operating mode circuit 22 and the second operating mode circuit 23 are both connected to the SOC chip 21. The primary winding port of the third transformer 28 is connected to the telephone line interface 27, the first secondary winding port of the third transformer 28 is connected to the first operating mode circuit 22, and the second secondary winding port of the third transformer 28 is connected to the second operating mode circuit 23. That is, the first transformer 24 and the second transformer 25 in the embodiment shown in fig. 5 are replaced with the third transformer 28 having two secondary coil ports in the present embodiment.

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

If the DSL client device is configured to operate in the second operation mode, when the DSL client device communicates with the DSL local-end, the upstream signal output by the SOC chip 21 is transmitted to the DSL local-end through the second operation mode circuit 23, the third transformer 28, the telephone line interface 27, and the telephone line, and the downstream signal from the DSL local-end is transmitted to the SOC chip 21 through the third transformer 28 and the second operation mode circuit 23 after being transmitted to the telephone line interface 27 through the telephone line, that is, the SOC chip 21 can receive the second signal output by the second operation mode circuit 23. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream signal is further transmitted to the SOC chip 21 through the third transformer 28 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, 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 the embodiment does not comprise a relay, the transformer in the single board circuit is connected with the telephone line which is arranged outside the DSL client device and is arranged outside the DSL client device, the transformer can realize isolation of the primary side and the 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 device in the embodiment combines two transformers into one on the basis of eliminating the relay, so that the size of the single-board circuit can be further reduced, and the miniaturized design of the DSL client device is facilitated.

In one embodiment, the first operating mode circuit 22 in the single board circuit in the implementation shown in fig. 7 comprises: the third amplifier chip 223 and the 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 the DSL client device in this embodiment may be shown in fig. 9, and fig. 9 is a schematic structural diagram of a single board circuit of the 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, and 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. The output of the third amplifier chip 223 and the input of the third hybrid 224 are both connected to the first secondary winding port of the third transformer 28, and the output of the third amplifier chip 223 is also connected to the input of the third hybrid 224. The output of the fourth amplifier chip 233, the input of the fourth hybrid 234 and the second secondary winding port of the third transformer 28 are connected, and the output of the fourth amplifier chip 233 is also connected to the input of the fourth hybrid 234. The primary winding port of the third transformer 28 is connected to the telephone line interface 27.

If the DSL client device is operating in the first operation mode, the SOC chip 21 is in a state of being on to the input of the third amplifier chip 223 and off to the input of the fourth amplifier chip 233. At this time, the uplink signal output by the SOC chip 21 is sequentially transmitted to the telephone line 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, and finally to the DSL office. The downstream signal from the DSL office end is transmitted to the SOC chip 21 after being transmitted to the telephone line interface 27 through the telephone line, and then transmitted to the SOC chip 21 through the primary winding of the third transformer 28, the first secondary winding 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 will be understood that, based on the circuit structure of fig. 9, the signal input to the third hybrid circuit 224 by the third transformer 28 is mixed with the uplink signal, and therefore, the uplink signal in the signal input to the third hybrid circuit 224 by the third transformer 28 is removed based on the uplink signal output to the third hybrid circuit 224 by the third amplifier chip 223, so as to obtain the downlink signal from the DSL office end, and the downlink signal is input to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream signal is further transmitted to the SOC chip 21 through the primary winding of the third transformer 28, the second secondary winding, 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. 8, the upstream signal is mixed in the signal input to the fourth mixing circuit 234 by the third transformer 28, but since the SOC chip 21 is in a state of being disconnected from the input terminal of the fourth amplifier chip 233, no signal is output from the output terminal of the fourth amplifier chip 233, and thus the upstream signal is still mixed in the second signal output and input to the SOC chip 21 by the fourth mixing circuit 234. Since the DSL client device is currently configured to operate in the first mode of operation, the SOC chip 21 processes the first signal output by the third hybrid 224 and discards the second signal output by the fourth hybrid 234 to ensure proper communication of the DSL client device.

If the DSL client device is operating in the second operation mode, the SOC chip 21 is in a state of being disconnected from the input of the third amplifier chip 223 and being connected to the input of the fourth amplifier chip 233. At this time, the uplink signal output from the SOC chip 21 is sequentially transmitted to the telephone line through the fourth amplifier chip 233, the second secondary winding and the primary winding of the third transformer 28, and the telephone line interface 27, and finally to the DSL line. The downstream signal from the DSL office end is transmitted to the SOC chip 21 after being transmitted to the telephone line interface 27 through the telephone line, and then transmitted to the SOC chip 21 through the primary winding of the third transformer 28, the second secondary winding 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 structure of fig. 9, the signals input to the fourth hybrid circuit 234 by the third transformer 28 are mixed with the uplink signals, and therefore, the fourth hybrid circuit 234 removes the uplink signals from the signals input to the fourth hybrid circuit 234 based on the uplink signals output to the fourth hybrid circuit 234 by the fourth amplifier chip 233, obtains the downlink signals from the DSL office, and inputs the downlink signals to the SOC chip 21 for processing. In addition, after the downstream signal from the DSL office end is transmitted to the telephone line interface 27 through the telephone line, the downstream signal is further transmitted to the SOC chip 21 through 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 is further capable of receiving the first signal output by the third hybrid circuit 224. It will be understood that, based on the circuit structure of fig. 9, the upstream signal is mixed in the signal input to the third mixing circuit 224 by the third transformer 28, 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 thus the upstream signal is still mixed in the first signal output and input to the SOC chip 21 by the third mixing circuit 224. Since the DSL client device is currently configured to operate in the second operation mode, in the case that the SOC chip 21 receives the first signal output by the third hybrid 224 and the second signal output by the fourth hybrid 234, the SOC chip 21 processes the second signal output by the fourth hybrid 234 and discards the first signal output by the third hybrid 224 to ensure normal communication of the DSL client device.

In yet another embodiment, the first operating mode circuit 22 in the single board circuit in the implementation shown in fig. 7 comprises: the third amplifier chip 223 and the 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 the DSL client device in this embodiment may be shown in fig. 10, and fig. 10 is a schematic structural diagram of a single board circuit of the 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, and 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. The output of the third amplifier chip 223 and the input of the third hybrid 224 are both connected to the first secondary winding port of the third transformer 28, and the output of the third amplifier chip 223 is also connected to the input of the third hybrid 224. The output of the fourth amplifier chip 233 and the isolation circuit 29 are both connected to the second secondary winding port of the third transformer 28, the output of the fourth amplifier chip 233 is also connected to the isolation circuit 29, and the isolation circuit 29 is also connected to the input 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 applicable to 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 winding side of the third transformer 28 affects the signal on the second secondary winding side of the third transformer 28, and there is a large 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. 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 234 and the second secondary winding port of the third transformer 28 to remove the signal on the first secondary winding side of the third transformer 28, so as to achieve the purpose of removing noise in the downstream signal received by the SOC chip 21. That is, the isolation circuit 29 is configured to remove the signal on the first secondary winding side of the third transformer 28 mixed in the signal inputted 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 inductance 295; the first end of the first capacitor 291 and the first end of the third capacitor 293 are both connected to the fourth hybrid circuit, the second end of the first capacitor 291 is connected to the first end of the second capacitor 292, the second end of the second capacitor 292 is connected to one of the second secondary ports of the third transformer 28, the second end of the third capacitor 293 is connected to the first end of the fourth capacitor 294, and the second end of the fourth capacitor 294 is connected to the other of the second secondary ports of the third transformer 28; the first end of the inductor 295 is connected to the second end of the first capacitor 291 and the first end of the second capacitor 292, respectively, and the second end of the inductor 295 is connected to the second end of the third capacitor 293 and the first end of the fourth capacitor 294, respectively. A schematic of an isolation circuit 29 is shown in fig. 11.

It will be appreciated that the above-described isolation circuit is an example of an isolation circuit structure, and the isolation circuit may be other circuit structures 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 will not be described here again.

The single board circuit of the DSL client device in the embodiment improves the protection performance of the DSL client device and is beneficial to realizing the miniaturization design of the DSL client device. Meanwhile, the single board circuit in the embodiment can ensure that the noise in the downlink signal received by the SOC chip in the DSL client device working in the second working mode is less under the conditions 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, and ensure the quality of the downlink signal received by the SOC chip so that the DSL client device and the DSL local side can normally communicate.

The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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, various embodiments are not necessarily referring to the same embodiments 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 various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on 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 the corresponding processing that the device would make under some objective condition, are not intended to limit the time, nor do they require that the device be implemented with a judging action, nor are they intended to imply other limitations.

Elements referred to in the singular are intended to be used in this application to mean "one or more" rather than "one and only one" unless specifically indicated. In this application, unless specifically stated otherwise, "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 merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: there are three cases where a alone exists, where a may be singular or plural, and where B may be singular or plural, both a and B exist alone.

The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "at least one of … …" or "at least one of … …" herein means all or any combination of the listed items, e.g., "at least one of A, B and C," may mean: there are six cases where a alone, B alone, C alone, a and B together, B and C together, A, B and C together, where a may be singular or plural, B may be singular or plural, and C may be singular or plural.

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

Claims

1. A single board circuit for a digital subscriber line, 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 with the first working mode circuit and the second working mode circuit, the first working mode circuit is connected with a first secondary coil port of the transformer, the second working mode circuit is connected with a second secondary coil port of the transformer, the primary coil port of the transformer is connected with a telephone line interface, so that when the DSL client device works in a first working mode or a second working mode, the downstream signal from the DSL local side can be transmitted to the SOC chip, and the upstream signal output by the SOC chip can be transmitted to the DSL local side.

2. The on-board circuit of claim 1, wherein the primary coil comprises at least two coils connected in series.

3. The single board circuit according to claim 1 or 2, wherein the first secondary coil comprises at least two coils connected in series.

4. The on-board circuit of claim 1, wherein the second secondary coil comprises at least two coils connected in series.

5. The single board circuit of claim 1, wherein the single board circuit comprises a plurality of capacitors,

when the DSL client device works in a first working mode, the SOC chip is used for processing a first signal input by the first working mode circuit and discarding a second signal input by the second working mode circuit;

and when the DSL client device works in the second working mode, the SOC chip is used for processing the second signal input by the second working mode circuit and discarding the first signal input by the first working mode circuit.

6. The on-board circuit of claim 1 or 5, wherein the first operating mode circuit comprises: the input end of the first amplifier chip and the output end of the first hybrid circuit are connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are connected with the first secondary coil port 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 works in the first working 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 into the first hybrid circuit to obtain a downlink signal from the DSL office.

7. The on-board circuit of claim 1 or 5, 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 connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are connected with the second secondary coil port of the transformer, and the output end of the second amplifier chip is also connected with the input end of the second hybrid circuit;

and when the DSL client device works in the second working mode, the second amplifier chip is used for amplifying the uplink signal output by the SOC chip, and the second hybrid circuit is used for removing the uplink signal input by the transformer into the second hybrid circuit to obtain the downlink signal from the DSL local side.

8. The on-board circuit of claim 1 or 5, 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 connected with the SOC chip, the output end of the second amplifier chip and the isolation circuit are connected with the second secondary coil port 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 works in the second working mode, the second amplifier chip is configured to amplify an uplink signal output by the SOC chip, the isolation circuit is configured to remove a signal on a first secondary winding side of the transformer included in a signal input by the transformer to the isolation circuit, and the second hybrid circuit is configured to remove an uplink signal input by the isolation circuit to the second hybrid circuit to obtain a downlink signal from the DSL office.

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

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

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

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 system comprises a first working mode circuit, a second working mode circuit, a first transformer, a second transformer, a first working mode circuit, a second working mode circuit, a telephone line interface, a DSL client device and a DSL local terminal, wherein the first working mode circuit is connected with the second working mode circuit, the first working mode circuit is connected with a secondary coil port of the first transformer, the second working mode circuit is connected with a secondary coil port of the second transformer, and a primary coil port of the first transformer and a primary coil port of the second transformer are connected with the telephone line interface so that the DSL client device can transmit downlink signals from the DSL local terminal to the SOC chip and transmit uplink signals output by the SOC chip to the DSL local terminal when working in the first working mode or the second working mode.

11. The single board circuit of claim 10, wherein the single board circuit comprises,

12. The on-board circuit of claim 10 or 11, wherein the first operating mode circuit comprises: the input end of the first amplifier chip and the output end of the first hybrid circuit are connected with the SOC chip; the output end of the first amplifier chip and the input end of the first hybrid circuit are 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 works in a first working mode, the first amplifier chip is used for amplifying an uplink signal output by the SOC chip, and the first hybrid circuit is used for removing the uplink signal input by the first transformer into the first hybrid circuit to obtain a downlink signal from the DSL local side.

13. The on-board circuit according to claim 10 or 11, wherein the second operation mode circuit includes: the input end of the second amplifier chip and the output end of the second hybrid circuit are connected with the SOC chip; the output end of the second amplifier chip and the input end of the second hybrid circuit are 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 works in the second working 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 into the second hybrid circuit, so as to obtain a downlink signal from the DSL office.

14. A transformer for a single board circuit according to claims 1-13, comprising: the magnetic core comprises a magnetic core, a primary coil, a first secondary coil and a second secondary coil, wherein the first secondary coil surrounds the periphery of the magnetic core, the primary coil surrounds the periphery of the first secondary coil, and the second secondary coil surrounds the periphery of the primary coil.

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

16. A transformer according to claim 14 or 15, wherein the first secondary coil comprises at least two coils, the at least two coils being connected in series.

17. The transformer of claim 14, wherein the second secondary coil comprises at least two coils connected in series.

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

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