CN101990041A - Telephone voice service interface testing method and telephone voice interface device - Google Patents

Abstract

The invention discloses a telephone voice service interface testing method and a telephone voice interface device. In the embodiment of the present invention, the codec module that connects the signal detection device to the POTS single board, and the codec module converts the digital voice signal of the signal detection device into an analog voice signal, and the analog voice signal passes through the DC loop holder or the signal loopback module After returning, it is converted into a digital voice signal by the codec module and sent to the signal detection device. The signal detection device realizes the detection of the POTS single board by comparing the sent and received digital voice signals. Compared with the prior art, the present invention The advanced signal detection equipment does not need to convert the analog signal into a digital signal again for comparison, and the design is relatively simple. At the same time, in the process of signal detection, the number of analog-to-digital conversions will be reduced, and the test accuracy will be improved.

Description

Telephone voice service interface testing method and telephone voice interface device

technical field

The invention relates to the technical field of communication, in particular to a telephone voice service interface testing method and a telephone voice interface device.

Background technique

Public Switch Telephone Network (PSTN-Public Switch Telephone Network), that is, the telephone network commonly used in our daily life. As we all know, PSTN is a circuit switching network based on analog technology. In the current telephone network network, the voice of the user end phone passes through the user line (cable), the distribution frame of the central office, and finally connects to the access device of the central office. Uplink to the PSTN network in the form of Time Division Multiplexing (TDM) data.

The uplink of the earlier traditional telephone service (Plain Old Telephone Service, POTS) is TDM data. With the development of technology, voice data is transmitted through the Internet Protocol (Internet Protocol, IP), and the access device terminates the TDM data internally, and transfers the TDM data to After being converted into IP data packets, it enters the IP network for voice transmission. In the central office access device, the module port for accessing copper telephone voice is called POTS port, and one POTS port corresponds to one terminal telephone user. In the prior art, a certain number of POTS ports are integrated on one POTS single board. If the POTS port fails or the system is installed and debugged, it is necessary to use the corresponding diagnostic equipment to detect the corresponding POTS board.

A schematic diagram of an existing fault diagnosis scheme for POTS port faults is shown in Figure 1. By connecting two POTS ports (POTS1 port and POTS2 port) of a POT board to an external POTS instrument, the POTS instrument generates analog voice signals and sends them For the POTS1 port of the POTS board, the analog voice signal is converted into a digital voice signal through the Subscriber Line Interface Circuit (Subscriber Line Interface Circuit, SLIC) and the codec (Coder-decoder, CODEC), and then sent to the digital signal processing module ( Digital Signal Processing, DSP), DSP sends digital voice signal to CODEC at POTS2 port, CODEC restores digital voice signal to analog voice signal, and outputs data voice signal to POTS instrument through SLIC. When testing the POTS instrument, it is necessary to digitize the transmitted voice signal and the received voice signal, then quantitatively analyze and compare them, and then obtain a quantified voice signal quality evaluation result, which shows the performance and operation status of the POTS board.

During the research and practice of the prior art, the inventor of the present invention found that the existing fault diagnosis method is to connect the POTS port with an external device, and analyze the analog voice signal of the POTS port to realize the POTS For the detection of the single board, because the analysis of the analog voice signal needs to be digitized, the quantitative analysis can be realized, so the POTS instrument needs to have an analog-to-digital conversion function, which increases the complexity of the POTS single board test, and the POTS instrument needs to be tested during the test. , increasing the number of voice signal analog-to-digital/digital-to-analog conversions, which reduces the test accuracy.

Contents of the invention

The embodiment of the present invention provides a telephone voice service interface testing method and a telephone voice interface device, which can simplify signal detection equipment and improve test accuracy.

An embodiment of the present invention provides a method for testing a telephone voice service interface, including:

The codec receiving signal detection device of the POTS port of the POTS single board sends the first digital voice signal;

The codec converts the digital voice signal into an analog voice signal and sends the analog voice signal to a DC loop keeper;

The codec receives the analog voice signal reflected by the DC loop holder, converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device converts the first digital voice signal The test result of the POTS single board is obtained by comparing with the second digital voice signal.

An embodiment of the present invention provides a method for testing a telephone voice service interface, including:

The first codec of the first POTS port of the POTS single board receives the first digital voice signal sent by the signal detection device;

The codec converts the first digital voice signal into an analog voice signal and sends the analog voice signal to the signal loopback module;

The signal loopback module couples the analog voice signal to the second codec of the second POTS port;

The second codec converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device compares the first digital voice signal with the second digital voice signal The test result of the POTS single board is displayed.

An embodiment of the present invention provides a telephone voice interface device, including: a codec and a DC loop holder;

A codec for converting the digital voice signal into an analog voice signal and sending the analog voice signal to the DC loop holder; and receiving the analog voice signal reflected by the DC loop holder, and converting the analog voice signal converted into a second digital signal and sent to the signal detection device;

The direct current loop maintainer is used for reflecting the analog voice signal sent by the codec to the codec.

An embodiment of the present invention provides a telephone voice interface device, including:

The signal detection device is used to send the first digital voice signal to the first codec of the first POTS port of the POTS single board; receive the second digital voice signal returned by the second codec of the second POT port, and convert the first digital The voice signal is compared with the second digital voice signal to obtain the test result of the POTS single board;

The first codec is used to receive the first digital voice signal sent by the signal detection device, convert the first digital signal into an analog voice signal and send the analog voice signal to the signal loopback module;

The second codec is used to receive the analog voice signal coupled from the signal loopback module, convert the analog voice signal into a second digital signal and send it to the signal detection device;

A signal loopback module, configured to couple the analog voice signal to the second codec of the second POTS port.

An embodiment of the present invention provides a telephone voice interface device, including:

A first codec, configured to receive the first digital voice signal sent by the signal detection device, convert the first digital signal into an analog voice signal and send the analog voice signal to a signal loopback module;

The second codec is used to receive the analog voice signal coupled from the signal loopback module, convert the analog voice signal into a second digital signal and send it to the signal detection device;

A signal loopback module, configured to couple the analog voice signal to the second codec of the second POTS port.

In the embodiment of the present invention, the codec module that connects the signal detection device to the POTS single board, and the codec module converts the digital voice signal of the signal detection device into an analog voice signal, and the analog voice signal passes through the DC loop holder or the signal loopback module After returning, it is converted into a digital voice signal by the codec module and sent to the signal detection device. The signal detection device realizes the detection of the POTS single board by comparing the sent and received digital voice signals. Compared with the prior art, the present invention The advanced signal detection equipment does not need to convert the analog signal into a digital signal again for comparison, and the design is relatively simple. At the same time, in the process of signal detection, the number of analog-to-digital conversions will be reduced, and the test accuracy will be improved.

Description of drawings

FIG. 1 is a schematic diagram of a fault diagnosis scheme for a POTS port fault in the prior art;

Fig. 2 is the flow chart of the embodiment of the present invention one telephone voice service interface test method;

Fig. 3 is the flowchart of the method for testing the telephone voice service interface of the second embodiment of the present invention;

FIG. 4 is a schematic diagram of a network structure of Application Example 1 of the present invention;

Fig. 5 is the flow chart of application example 1 of the present invention;

Fig. 6 is a schematic diagram of the network structure of the second application example of the present invention;

Fig. 7 is the flow chart of application example 2 of the present invention;

Fig. 8 is the flowchart of the method for testing the telephone voice service interface of the third embodiment of the present invention;

Fig. 9 is a flowchart of a method for testing a telephone voice service interface according to Embodiment 4 of the present invention;

FIG. 10 is a schematic diagram of a network structure of Application Example 3 of the present invention;

Fig. 11 is a flow chart of the third application example of the present invention;

Fig. 12 is a schematic diagram of the network structure of Application Example 4 of the present invention;

Fig. 13 is a flowchart of application example 4 of the present invention;

14 is a schematic structural diagram of a telephone voice interface device according to Embodiment 3 of the present invention;

15 is a schematic structural diagram of a telephone voice interface device according to Embodiment 4 of the present invention;

16 is a schematic structural diagram of a telephone voice interface device according to Embodiment 5 of the present invention;

Fig. 17 is a schematic structural diagram of a telephone voice interface device according to Embodiment 6 of the present invention.

Detailed ways

Embodiments of the present invention provide a telephone voice service interface testing method and a telephone voice interface device, which will be described in detail below.

Embodiment 1. A method for testing a telephone voice service interface, the flow chart of which is shown in Figure 2, comprising:

S1, the codec receiving signal detection device of the POTS port of the POTS single board sends the first digital voice signal;

S2, the codec converts the digital voice signal into an analog voice signal and sends the analog voice signal to a DC loop maintainer;

S3, the codec receives the analog voice signal reflected by the DC loop holder, converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device converts the first digital signal The voice signal is compared with the second digital voice signal to obtain a test result of the POTS single board.

In Embodiment 1 of the present invention, the signal detection device can perform signal detection under the remote control of the network management system. Specifically, the signal detection device can send a test request to the POTS port of the POTS single board after receiving the POTS single board test request sent by the network management system. The codec sends the first digital voice signal, and after obtaining the test result of the POTS single board includes: feeding back the test result to the network management system.

Embodiment 2, a method for testing a telephone voice service interface, the flow process is as shown in Figure 3, including:

A1, the signal detection device sends the first digital voice signal to the codec of the POTS port of the POTS single board;

Codec (CODEC) is a commonly used audio signal processing chip, which is used in telephone systems and computer audio processing fields. It is mainly responsible for digital->analog signal conversion (DAC) and analog->digital signal conversion (ADC).

The signal detection device in this embodiment can be a built-in self-test (Build-In SelfTest, BIST) module, can use modules such as existing or proprietary DSP, micro control unit (MicroControllerUnit, MCU) on the voice system to realize processing Voice processing. The signal detection device may be on the POTS board itself, or outside the POTS board. When the signal detection device is integrated inside the POTS board, it can share resources with the POTS board, such as CPU, memory, etc. When the signal detection device is set outside the POTS board, the POTS board needs to be connected to the signal detection device The interface is used to realize the connection between the signal detection equipment and the codec of the POTS single-board memory to transmit voice data.

A2, the codec converts the first digital voice signal into an analog voice signal and sends the analog voice signal to the DC loop holder;

DC loop maintainer: It is a circuit module that can realize the formation of a DC loop on the subscriber line while presenting high resistance to the AC signal. The circuit module can be outside the POTS board or inside the board. In practical applications, for an AC voice signal, the DC loop keeper can partially reflect or fully reflect the voice signal.

The process of sending the analog voice signal to the DC loop holder includes: the codec sends the analog voice signal to the DC loop holder through the subscriber line interface circuit, and the codec (CODEC): is a module that realizes the POTS of the analog voice circuit . The codec can also be integrated with the subscriber line interface circuit (SLIC) in an integrated chip, or can be separated from the SLIC to become two independent chips.

A3, the codec receives the analog voice signal reflected by the DC loop holder, converts the analog voice signal into a second digital signal and sends it to the signal detection device;

The codec receiving the analog voice signal reflected back by the DC loop keeper includes: the codec receiving the analog voice signal reflected back by the DC loop keeper through a subscriber line interface circuit.

A4. The signal detection device compares the first digital voice signal with the second digital voice signal to obtain a test result of the POTS board.

Embodiment 2 of the present invention adopts the codec module that connects the signal detection device to the POTS single board, and the codec module converts the digital voice signal of the signal detection device into an analog voice signal. After the analog voice signal returns through the DC loop holder, it passes through The codec module is converted into a digital voice signal and sent to the signal detection device. The signal detection device realizes the detection of the POTS single board by comparing the digital voice signal sent and received. Compared with the prior art, the signal detection device of the present invention There is no need to convert the analog signal into a digital signal again for comparison, and the design is relatively simple. At the same time, in the process of signal detection, the number of times of analog-to-digital conversion will be reduced, and the test accuracy will be improved.

In Embodiment 2 of the present invention, the signal detection device can perform signal detection under the remote control of the network management system. Specifically, the signal detection device can send the POTS single board test request to the POTS port of the POTS single board after receiving the POTS single board test request sent by the network management system. The codec sends the first digital voice signal, and after obtaining the test result of the POTS single board includes: feeding back the test result to the network management system.

The following provides an application example 1 of the embodiment of the present invention applied to an existing telephone system. The schematic diagram of its network structure is shown in FIG. 4 , and the flow chart is shown in FIG. 5 , including steps:

C1, the network management and other systems issue voice self-test commands to the POTS board.

C2, the POTS single board controls the switching switch K to switch the SLIC external path from point b for normal use to point a for fault diagnosis.

C3, the POTS port starts the off-hook state and establishes a voice channel.

C4, the signal detection device generates specific voice data (the data can be the waveform in the test standard in ITU Q.552, or a multi-frequency mixing signal can be generated to improve the test speed)

C5, after the voice data is processed by the CODEC, the voice signal becomes analog and arrives at the DC loop holder.

C6, because the DC loop maintainer presents high resistance to voice, the voice signal is totally reflected back to the SLIC.

C7, SLIC receives the reflected signal, and after reverse processing by CODEC, the voice signal reaches the signal detection device.

C8, the signal detection equipment compares the sent and received signals to judge whether the product is faulty.

C9, reporting the diagnostic test result to the network management system.

The following provides an application example 2 in which the embodiment of the present invention is applied to an existing telephone system. Its network structure diagram is shown in FIG. 6 , and its flow chart is shown in FIG. 7 , including steps:

D1, the network management and other systems control the automatic line grabbing device of the office point, switch the subscriber line from point b for normal use to point a for fault diagnosis, and connect it to the DC loop keeper.

In the embodiment of the present invention, the automatic wire grabbing device is a device that receives remote or local operation control, cuts off the connection between the POTS port and the user, and connects the POTS port to the DC loopback holder or the signal loopback module. There are many specific control methods, for example: it can be local manual operation, or it can be controlled through remote signals and relays/switches.

D2. The network management system issues a voice self-test command to the POTS port single board.

D3, the POTS port starts the off-hook state and establishes a voice channel.

D4, the signal detection device generates specific voice data (the data can be the waveform data in the test standard in ITU Q.552, or it can generate multi-frequency mixing signals to improve the test speed)

D5, after the voice data is processed by the CODEC, the voice signal becomes analog and arrives at the DC loop holder.

D6, the voice signal is totally reflected back to the SLIC.

D7, the SLIC receives the reflected signal, and after reverse processing by the CODEC, the voice signal reaches the signal detection device.

D8. The signal detection equipment compares the sent and received signals to determine whether the product is faulty.

D9, report the diagnostic test results through the network management system

The difference between application example 2 and application example 1 is that in application example 2, the DC loop keeper is externally placed to realize multiplexing of the DC loop keeper, and multiple POTS ports can reuse the same DC loop keeper for testing.

Embodiment 3. A method for testing a telephone voice service interface, the flow chart of which is shown in FIG. 8 , including:

T1, the first codec of the first POTS port of the POTS single board receives the first digital voice signal sent by the signal detection device;

T2, the codec converts the first digital voice signal into an analog voice signal and sends the analog voice signal to a signal loopback module;

T3, the signal loopback module couples the analog voice signal to the second codec of the second POTS port;

T4, the second codec converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device converts the first digital voice signal and the second digital voice signal The test results of the POTS single board are obtained by comparison.

In the telephone voice service interface testing method of this embodiment, by adding a simple signal loopback module and external signal detection equipment, the test of the telephone service voice index can be realized. Compared with the test method in the prior art, the analog signal and The number of conversions between digital signals simplifies the device. Reduced testing costs.

Embodiment 4. A method for testing a telephone voice service interface, the flow chart of which is shown in FIG. 9 , including:

F1, the signal detection device sends the first digital voice signal to the first codec of the first POTS port of the POTS single board;

F2, the codec converts the first digital voice signal into an analog voice signal and sends the analog voice signal to the signal loopback module;

It can be understood that in this embodiment, the signal loopback module can realize the voice signal coupling between two POTS ports (that is, the voice signal of one POTS port is transmitted to another POTS port), and at the same time, the corresponding POTS port starts to pick up machine status. The signal loopback module can be inside or outside the POTS board. The signal loopback module is a capacitor or a transformer or similar components or integrated circuits that can couple AC signals.

F3, the signal loopback module couples the analog voice signal to the second codec of the second POTS port;

F4, the second codec will convert the analog voice signal into a second digital signal and send it to the signal detection device;

F5, the signal detection device compares the first digital voice signal with the second digital voice signal to obtain a test result of the POTS board.

In Embodiment 4 of the present invention, the signal detection device can perform signal detection under the remote control of the network management system. Specifically, the signal detection device can send the POTS single board test request to the POTS port of the POTS single board after receiving the POTS single board test request sent by the network management system. The codec sends the first digital voice signal, and after obtaining the test result of the POTS single board includes: feeding back the test result to the network management system.

The difference between the second embodiment of the present invention and the third embodiment is that the second embodiment uses the signal loopback module to return the signal to the signal detection device through other POTS ports, which can be used to test two POTS ports at a time.

The following provides an application example 3 of Embodiment 3 of the present invention applied to an existing telephone system. Its network structure diagram is shown in FIG. 10 , and its flow chart is shown in FIG. 11 , including steps:

G1, network management and other systems issue voice self-test commands to POTS port single boards.

G2. The POTS single board controls the switching switches K1 and K2 to switch the two external POTS channels of the SLIC from point b for normal use to point a for fault diagnosis.

G3. The POTS port starts the off-hook state and establishes a voice channel.

G4. The signal detection equipment generates specific voice data (the data can be the waveform in the test standard in ITU Q.552, or can generate multi-frequency mixing signals to improve the test speed), and send it to the corresponding CODEC of K1.

G5. After the voice is processed by CODEC and SLIC, the voice signal becomes an analog arrival signal loopback module.

G6. The signal loopback module couples the voice signal to the POTS port corresponding to K2.

The SLIC corresponding to G7 and K2 receives the reflected signal, and after reverse processing by CODEC, the voice signal reaches the signal detection device.

G8. The signal detection equipment compares the sent and received signals to judge whether the product is faulty.

G9. Report the diagnosis test result to the network management system.

The following provides an application example 4 of Embodiment 2 of the present invention applied to an existing telephone system. Its network structure schematic diagram is shown in FIG. 12 , and the flow chart is shown in FIG. 13 , including steps:

H1. The operator controls the automatic line grabbing device of the office through the network management system and other systems, and switches the subscriber lines of the two POTS ports from point b in normal use to point a in fault diagnosis with K1 and K2 respectively, and connects with the signal loopback module connected.

H2. The network management system issues a voice self-test command to the POTS port single board.

H3. The POTS port starts the off-hook state and establishes a voice channel.

H4. The signal detection device generates specific voice data (the data can be the waveform in the test standard in ITU Q.552, or can generate multi-frequency mixing signals to improve the test speed) to the corresponding CODEC of the K1 port.

After H5, CODEC and SLIC are processed, the voice signal becomes analog and arrives at the signal loopback module. And after signal coupling, the voice signal is coupled to the corresponding POTS port of K2.

The SLIC corresponding to H6 and K2 receives the voice, and after reverse processing by the CODEC, the voice signal reaches the signal detection device.

H7. The signal detection equipment compares the sent and received signals to judge whether the product is faulty.

H8. Report the diagnosis test result to the network management system.

The difference between application example 4 and application example 3 is that in application example 2, the signal loopback module is externally installed, and operators can add signal loopback modules to the two POTS ports by plugging and unplugging.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, disk or CD, etc.

Embodiment 3. A telephone voice interface device, as shown in FIG. 14 , includes: a signal detection module 1210, a codec 1220, and a DC loop holder 1230;

The signal detection module 1210 is used to send the first digital voice signal to the codec 1220 of the POTS port of the POTS single board; receive the second digital voice signal returned by the codec 1220, and convert the first digital voice signal and the second digital voice signal The signals are compared to obtain the test results of the POTS board;

The codec 1220 is used to convert the digital voice signal into an analog voice signal and send the analog voice signal to the DC loop holder 1230; and receive the analog voice signal reflected by the DC loop holder 1230, and convert the analog voice signal into The second digital signal is sent to the signal detection device 1210;

The DC loop holder 1230 is configured to reflect the analog voice signal sent by the codec 1220 to the codec.

It can be understood that the signal detection module 1210 in the embodiment of the present invention is also used to receive the POTS single board test request sent by the network management system, and after generating the test result, send the test result to the network management system.

It can be understood that the signal detection module and the DC loop maintainer in the embodiment of the present invention can be integrated inside the telephone voice interface device, or can be outside the telephone voice interface device.

Embodiment 4. A telephone voice interface device, the structural diagram of which is shown in FIG. 15 , including:

The signal detection module 1310 is used to send the first digital voice signal to the first codec of the first POTS port of the POTS single board; receive the second digital voice signal returned by the second codec of the second POT port, and convert the first The digital voice signal is compared with the second digital voice signal to obtain the test result of the POTS single board;

The first codec 1320 is used to receive the first digital voice signal sent by the signal detection module, convert the first digital signal into an analog voice signal and send the analog voice signal to the signal loopback module;

The second codec 1340 receives the analog voice signal coupled by the signal loopback module, converts the analog voice signal into a second digital signal and sends it to the signal detection module;

Signal loopback module 1330, the signal loopback module couples the analog voice signal to the second codec of the second POTS port. It can be understood that the signal loopback module 1330 may be a component or an integrated circuit with an AC coupling function such as a capacitor or a transformer.

It can be understood that the signal detection module 1310 in this embodiment can also be used to receive the POTS single board test request sent by the network management system, and send the test result to the network management system after generating the test result.

Embodiment 5. A telephone voice interface device, the structural diagram of which is shown in FIG. 16 , including: a codec 1610 and a DC loop holder 1620;

The codec 1610 is used to convert the digital voice signal into an analog voice signal and send the analog voice signal to the DC loop holder 1620; and receive the analog voice signal reflected by the DC loop holder 1620, and convert the The analog voice signal is converted into a second digital signal and sent to the signal detection module;

The DC loop holder 1620 is configured to reflect the analog voice signal sent by the codec 1610 to the codec 1610 .

Embodiment 6. A telephone voice interface device, the structural diagram of which is shown in FIG. 17 , including:

The first codec 1710 is configured to receive the first digital voice signal sent by the signal detection device, convert the first digital signal into an analog voice signal, and send the analog voice signal to the signal loopback module 1530;

The second codec 1720 is configured to receive the analog voice signal coupled from the signal loopback module 1730, convert the analog voice signal into a second digital signal and send it to the signal detection device;

The signal loopback module 1730 is configured to couple the analog voice signal sent by the first codec 1710 to the second codec 1720 of the second POTS port.

The telephone voice interface device provided by the embodiment of the present invention connects the signal detection module to the codec module of the POTS single board, and the codec module converts the digital voice signal of the signal detection module into an analog voice signal, and the analog voice signal passes through the DC loop holder Or after the signal loopback module returns, it is converted into a digital voice signal by the codec module and sent to the signal detection module. The signal detection module realizes the detection of the POTS board by comparing the sent and received digital voice signals. There is technology, the signal detection module of the present invention does not need to convert the analog signal into a digital signal again for comparison, the design is relatively simple, and at the same time, in the process of signal detection, the number of analog-to-digital conversions will be reduced, and the test accuracy will be improved.

Above, the telephone voice service interface testing method and the telephone voice interface device provided by the embodiment of the present invention have been introduced in detail. In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for To help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as limiting the invention.

Claims (12)

1. A method for testing a telephone voice service interface, characterized in that, comprising: The codec receiving signal detection device of the POTS port of the POTS single board sends the first digital voice signal; The codec converts the digital voice signal into an analog voice signal and sends the analog voice signal to a DC loop keeper; The codec receives the analog voice signal reflected by the DC loop holder, converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device converts the first digital voice signal The test result of the POTS single board is obtained by comparing with the second digital voice signal. 2. The method according to claim 1, wherein the signal detection device comprises before sending the first digital voice signal to the codec of the POTS port of the POTS single board: Receive the POTS single board test request sent by the network management system; After obtaining the test result of the POTS single board, it includes: The test result is fed back to the network management system. 3. The method according to claim 1 or 2, wherein the codec sending the analog voice signal to the DC loop maintainer comprises: The codec sends the analog voice signal to the DC loop maintainer through the subscriber line interface circuit; The codec receives the analog voice signal reflected by the DC loop keeper including: The codec receives the analog voice signal reflected by the DC loop keeper through the subscriber line interface circuit. 4. A method for testing a telephone voice service interface, characterized in that it comprises: The first codec of the first POTS port of the POTS single board receives the first digital voice signal sent by the signal detection device; The codec converts the first digital voice signal into an analog voice signal and sends the analog voice signal to the signal loopback module; The signal loopback module couples the analog voice signal to the second codec of the second POTS port; The second codec converts the analog voice signal into a second digital signal and sends it to the signal detection device, so that the signal detection device compares the first digital voice signal with the second digital voice signal The test result of the POTS single board is displayed. 5. The method according to claim 1, wherein the signal detection device comprises before sending the first digital voice signal to the codec of the POTS port of the POTS single board: Receive the POTS single board test request sent by the network management system; After obtaining the test result of the POTS single board, it includes: The test result is fed back to the network management system. 6. A telephone voice interface device, characterized in that it comprises: a signal detection device, a codec, a DC loop holder; The signal detection device is used to send the first digital voice signal to the codec of the POTS port of the POTS single board; receive the second digital voice signal returned by the codec, and convert the first digital voice signal and the second digital voice signal Comparing and obtaining the test results of the POTS single board; The codec is used to convert the digital voice signal into an analog voice signal and send the analog voice signal to the DC loop holder; and receive the analog voice signal reflected by the DC loop holder, and convert the analog voice signal into and send the second digital signal to the signal detection device; The direct current loop maintainer is used for reflecting the analog voice signal sent by the codec to the codec. 7. telephone voice interface device as claimed in claim 6, is characterized in that, described signal detection equipment is also used for receiving the POTS single-board test request that network management system sends, and after generating test result, test result is sent to network management system. 8. A telephone voice interface device, comprising: a codec and a DC loop retainer; A codec for converting the digital voice signal into an analog voice signal and sending the analog voice signal to the DC loop holder; and receiving the analog voice signal reflected by the DC loop holder, and converting the analog voice signal converted into a second digital signal and sent to the signal detection device; The direct current loop maintainer is used for reflecting the analog voice signal sent by the codec to the codec. 9. A telephone voice interface device, characterized in that, comprising: The signal detection device is used to send the first digital voice signal to the first codec of the first POTS port of the POTS single board; receive the second digital voice signal returned by the second codec of the second POT port, and convert the first digital The voice signal is compared with the second digital voice signal to obtain the test result of the POTS single board; The first codec is used to receive the first digital voice signal sent by the signal detection device, convert the first digital signal into an analog voice signal and send the analog voice signal to the signal loopback module; The second codec is used to receive the analog voice signal coupled from the signal loopback module, convert the analog voice signal into a second digital signal and send it to the signal detection device; A signal loopback module, configured to couple the analog voice signal to the second codec of the second POTS port. 10. The telephone voice interface device according to claim 9, wherein the signal loopback module is a capacitor or a transformer. 11. The telephone voice interface device as claimed in claim 9 or 10, wherein the signal detection device is also used for receiving the POTS single board test request sent by the network management system, and after generating the test result, the test result is sent to the network management system. 12. A telephone voice interface device, characterized in that, comprising: A first codec, configured to receive the first digital voice signal sent by the signal detection device, convert the first digital signal into an analog voice signal and send the analog voice signal to a signal loopback module; The second codec is used to receive the analog voice signal coupled from the signal loopback module, convert the analog voice signal into a second digital signal and send it to the signal detection device; A signal loopback module, configured to couple the analog voice signal to the second codec of the second POTS port.

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