CN101742013B - System and method for simulating user line access multiplexing - Google Patents

Abstract

The invention discloses an analog subscriber line access multiplexing system and method, wherein the method includes: when one or more user terminals connected to the user terminal multiplexing equipment pick up the hook, the user terminal multiplexing equipment stops at the user terminal The corresponding port of the user end sends an on-hook signal; the user end multiplexing device modulates the analog voice information sent by the user terminal from the corresponding port with different frequency offsets, and then transmits it to the central office end multiplexing device to receive and demodulate the corresponding frequency offset; The terminal multiplexing device modulates the analog voice information sent by other user terminals from the corresponding port with different frequency offsets, and then transmits it to the user terminal multiplexing device to receive and demodulate the corresponding frequency offset; after the user terminal hangs up, the user terminal multiplexes Use the device to resume sending the on-hook signal at the corresponding port of the user terminal. The invention realizes the simultaneous transmission of multiple analog voice services by using a pair of user's outside lines, improves the utilization efficiency of the user's outside line cables, and can reduce the cost of expansion and operation of operators.

Description

An analog subscriber line access multiplexing system and method

technical field

The present invention relates to a system and method for multiplexing analog subscriber lines, in particular to a system for multiplexing analog subscriber lines in an access network (ANAccess Network), and a method for realizing multiplexing functions of the system.

Background technique

The scale of the existing telecommunication network system is increasing day by day, and more and more users are connected. Moreover, due to the cost reduction, the telecommunication network is gradually moving from cities to towns and villages, and the growth of users in remote areas has become a new growth point of telecommunication. However, the increasing price of raw materials such as copper has increased the network construction and maintenance costs of operators.

In the existing PSTN (Public Switched Telephone Network) telephone network, the number of user lines is huge. Users in rural and remote areas only need analog voice access services because they are scattered and mainly low-end users. A pair of user lines provides analog voice access services for one user, which does not fully utilize the bandwidth of the wired transmission line. Once a new user needs to access, a new user line must be added, which increases the cost of the operator.

The existing subscriber line multiplexing technology mostly adopts the method of time division multiplexing to provide analog telephone access services to different end users through a pair of subscriber lines. These end users can only use one user normally at a time, and other users cannot simultaneously use, causing inconvenience to users.

Contents of the invention

The technical problem to be solved by the present invention is to provide an analog subscriber line access multiplexing system and method, which realizes the use of a pair of subscriber outside lines while simultaneously transmitting multiple channels of analog voice services, improves the utilization efficiency of the subscriber's outside line cables, and can reduce the number of operators Expansion and operating costs.

In order to solve the above technical problems, the present invention provides an analog subscriber line access multiplexing method, including: when one or more user terminals connected to the user terminal multiplexing equipment are off-hook, the user terminal multiplexing equipment stops at the The corresponding port of the user terminal sends an on-hook signal; the multiplexing device at the user end modulates the analog voice information sent by the user terminal from the corresponding port with different frequency offsets, and then transmits it to the multiplexing device at the central office to receive and adjust the corresponding frequency offset. Demodulation: after the central office multiplexing device modulates the analog voice information sent by other user terminals from the corresponding port with different frequency offsets, then transmits it to the user terminal multiplexing device to receive and demodulate the corresponding frequency offset; After the user terminal hangs up, the multiplexing device at the user terminal resumes sending an on-hook signal at a corresponding port of the user terminal.

Further, the user terminal connected to the multiplexing device at the user end sends respective on-hook signals to the multiplexing device at the central office through the corresponding port through the multiplexing device at the user end.

Further, the central office multiplexing device detects that the on-hook signal of the port disappears, and performs an off-hook operation on the port; the central office multiplexing device detects the on-hook signal of the port, performs an on-hook operation on the port, and ends said business.

Further, before one or more user terminals connected to the multiplexing device at the user end go off-hook, the method further includes: the other user terminal calls the user terminal connected to the multiplexing device at the user end, and the other user terminal A ringing signal of a specific frequency sent by the corresponding port is sent to the user-side multiplexing device through the central office multiplexing device; the user-side multiplexing device judges the corresponding port according to the amplitude of the ringing signal, and generates a ringing signal. The stream is sent to the corresponding user terminal connected to the multiplexing device at the user end; the user terminal rings, and the user goes off-hook.

In order to solve the above technical problems, the present invention also provides an analog subscriber line access multiplexing system, including: multiplexing equipment at the user end and multiplexing equipment at the central office, wherein,

The user terminal multiplexing device is used to connect one or more user terminals, stop sending the on-hook signal at its corresponding port when the user terminal is off-hook, and resume sending the on-hook signal at its corresponding port after the user terminal is on-hook It is also used to modulate the analog voice information sent by the user terminal from the corresponding port with different frequency offsets and then transmit it to the multiplexing device at the central office, and receive the analog voice information transmitted from the multiplexing device at the central office and perform Demodulation of the corresponding frequency offset;

The central office multiplexing device is used to modulate the analog voice information sent by other user terminals from corresponding ports to the user terminal multiplexing device after modulation with different frequency offsets, and receive the user terminal multiplexing device transmission The incoming analog voice information and demodulate the corresponding frequency offset.

Further, the multiplexing device at the user end is configured to send the respective on-hook signals sent by the user terminals connected to it through corresponding ports to the multiplexing device at the central office.

Further, when the central office multiplexing device detects that the on-hook signal of the port disappears, it performs an off-hook operation on the port; when it detects the on-hook signal on the port, it performs an on-hook operation on the port, and ends said business.

Further, the multiplexing device at the central office is used to transmit the vibration of a specific frequency sent by the port corresponding to the other user terminal when the other user terminal calls the user terminal connected to the multiplexing device at the user end The ring signal is sent to the multiplexing device at the user end; the multiplexing device at the user end judges the corresponding port according to the amplitude of the ringing signal, generates a ringing current and sends it to the corresponding user terminal connected to the multiplexing device at the user end.

Beneficial technical effect of the present invention:

For the disadvantages that each pair of user lines can only transmit one analog voice service and the existing multiplexing technology cannot provide multiple analog voice access services at the same time, on the premise of using a pair of user outside lines, frequency division multiplexing technology is adopted , transmit multiple analog voice services at the same time, improve the utilization efficiency of user's outside line cables, enable operators to expand the capacity of analog voice access services without increasing the number of outside lines from the central office to end users, and reduce the expansion and operation of operators the cost of.

Description of drawings

FIG. 1 is a schematic diagram of an office multiplexing device, an analog access device, and a user terminal device in an embodiment of the present invention;

FIG. 2 is a schematic diagram of an office multiplexing device in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a client multiplexing device in an embodiment of the present invention;

FIG. 4 is a first flow chart of a multiplexing implementation method based on the device in an embodiment of the present invention;

FIG. 5 is a second flowchart of a multiplexing implementation method based on the device in an embodiment of the present invention.

Detailed ways

The core of the present invention is: when one or more user terminals connected to the user terminal multiplexing device are off-hook, the user terminal multiplexing device stops sending an on-hook signal at the corresponding port of the user terminal; After the analog voice information sent by the user terminal from the corresponding port is modulated with different frequency offsets, it is transmitted to the multiplexing device at the central office to receive and demodulate the corresponding frequency offset; After the analog voice information sent is modulated with different frequency offsets, it is transmitted to the user terminal multiplexing device to receive and demodulate the corresponding frequency offset; after the user terminal hangs up, the user terminal multiplexing device The corresponding port resumes sending the on-hook signal.

The analog subscriber line access multiplexing system proposed by the present invention is described below with an embodiment, as shown in Figure 1, the multiplexing system includes:

Central office multiplexing equipment, connected with analog access equipment, responsible for central office subscriber line multiplexing, and analog terminal user disconnection;

The multiplexing device at the user end is responsible for the multiplexing of the user line at the user end, feeds power to the terminal equipment (telephone), detects the on-hook of the terminal, sends a ringing current to the terminal when called, and informs the multiplexing device at the central office of the on-hook status of the terminal; The central office multiplexing equipment sends the user on-hook signal;

It also includes: a separator, which is a low-pass filter, responsible for separating the low-frequency analog voice signal (port 0) from the relatively high-frequency signal transmitted after frequency offset modulation to avoid mutual interference.

Among them, the multiplexing equipment at the central office includes: an off-hook control module (receiving end) 11, a low-pass filter module 12, a high-pass filter module 13, a coupling module 14, a frequency offset modulation and demodulation module 15 and a power supply module 16;

When the current terminal connected to the multiplexing device at the user end makes a call:

The off-hook control module (receiving end) 11 is responsible for detecting the on-hook signal of the specific frequency (outside the modulation frequency band) corresponding to each port sent by the coupling module 14, and after stopping receiving the on-hook signal of some ports, carry out the corresponding port. Simulate the off-hook operation of the phone, and send the analog voice signal of the corresponding port to the analog access device; after the port recovers and receives the on-hook signal, perform the on-hook operation of the analog phone at the port;

The low-pass filtering module 12 is responsible for separating the analog voice signal on the port 0 transmitted by the user end multiplexing device from the analog voice signal of other ports through modulation, and obtaining the analog voice signal on the port 0;

The high-pass filter module 13 is responsible for separating the modulated analog voice signals of some ports from the client multiplexing device from the on-hook signals of other ports, obtaining the AC components of the on-hook signals of other ports, and then sending them to the coupling module 14;

The coupling module 14 is responsible for coupling the AC component of the analog voice signal on some ports demodulated by the frequency offset modulation and demodulation module 15 and the AC component of the on-hook signal on other ports to the DC component provided by the port of the access device to obtain the The analog voice signal and the on-hook signal are sent to the off-hook control module 11;

The frequency offset modulation and demodulation module 15 is responsible for demodulating the analog voice signals of some ports transmitted by the multiplexing equipment at the user end according to the corresponding frequency bands, obtaining the AC components of the analog voice signals on these ports, and then sending them to the coupling module 14 ;

The power supply module 16 provides power to each of the above-mentioned modules.

When the current terminal connected to the multiplexing device at the user end is called:

The coupling module 14 is responsible for removing the DC component from the analog voice signal output by other analog access devices, obtaining the AC component of the analog voice signal on the corresponding port, and coupling it to the frequency offset modulation and demodulation module 15 for modulation;

The frequency offset modulation and demodulation module 15 is responsible for modulating the AC component of the analog voice signal on the port with different frequency offsets, modulating it into multiple frequency bands, transmitting one analog voice signal in each frequency band, and transmitting it to the user through the external line of the user Terminal multiplexing equipment.

User terminal multiplexing equipment, comprising, coupling module 22, ring current module 23, frequency offset modulation and demodulation module 24, off-hook control module (transmitter) 21, power supply module 25;

Coupling module 22 is responsible for removing the DC component from the on-hook signal sent by the off-hook control module 21 to obtain the AC component of the on-hook signal, and transmits it to the office multiplexing device through the user's outside line; responsible for the analog voice signal sent by the off-hook control module 21 After the direct current component is removed, the coupling is sent to the frequency deviation modulation and demodulation module 24; Ringing current module 23;

Ringing current module 23, is responsible for detecting described ringing signal, and produces the ringing current that is sent to terminal (phone); Analog voice signal is directly sent to corresponding terminal (phone); Because the exchange component of ringing signal is far greater than common voice signal, so the detection of the ringing signal is realized by setting the signal amplitude detection threshold;

Frequency offset modulation and demodulation module 24 is responsible for modulating the analog voice signals of terminals (telephone sets) with different frequency offsets; at the same time, the analog voice signals transmitted by the central office multiplexing equipment through the user's outside line are demodulated according to the corresponding frequency bands, and then Send it to the coupling module 22; when called, demodulate the ringing signal transmitted by the central office multiplexing device through the user's outside line according to the corresponding frequency band, and then send it to the coupling module 22;

The off-hook control module (transmitter) 21 is responsible for feeding power to the terminal equipment (phone), detects the off-hook state of the terminal (phone), and outputs an analog voice signal to the coupling module through the corresponding port for the off-hook terminal (phone) 22. Generate an on-hook signal corresponding to a dedicated frequency for other ports and send it to the coupling module 22;

Power supply module 25, the module above provides power supply.

Next, an embodiment will be used to illustrate the method flow of the present invention.

The implementation method based on the analog subscriber line access multiplexing equipment proposed by the present invention is mainly divided into two situations: 1. The terminal connected to the multiplexing equipment at the user end is used as the calling party; 2. The terminal connected to the multiplexing equipment at the user end is used as the called party Call.

As shown in Figure 4, when the terminal connected to the multiplexing device is the calling party:

Step 101, the multiplexing device at the user end is powered on, and the off-hook control module (transmitter) sends an on-hook signal of a specific frequency;

Step 102, the terminal user goes off-hook, and the multiplexing device at the user end detects that the user goes off-hook, adjusts the output voltage and current, and stops sending an on-hook signal of a specific frequency at the corresponding port;

In step 103, the central office multiplexing device detects that the on-hook signal of the specific frequency of the corresponding port disappears, and the off-hook control module (receiving end) performs an off-hook action on the corresponding port.

Step 104, simulating the corresponding port of the access device to go off-hook, and the calling user dials. Start the normal calling service.

The multiplexing device at the user end modulates the analog voice information of different ports with different frequency offsets, and then transmits the modulated signal to the multiplexing device at the central office through the user's outside line; the multiplexing device at the central office performs analog voice information on different ports Demodulation of the corresponding frequency offset. Conversely, the multiplexing equipment at the central office performs modulation with different frequency offsets, and the multiplexing equipment at the user end performs demodulation with corresponding frequency offsets.

In step 105, the call of the calling party ends, and the terminal user hangs up.

Step 106, the multiplexing device at the user end detects that the user is on-hook, adjusts the output voltage and current, and sends an on-hook signal of a specific frequency;

Step 107, the central office multiplexing device detects the on-hook signal of the corresponding port, and the off-hook control module (receiving end) performs an on-hook action on the corresponding port.

Step 108, simulating the corresponding port of the access device to hang up, and the calling service ends.

As shown in Figure 5, when the terminal connected to the multiplexing device is called:

Step 201, power on the multiplexing device at the user end, and send an on-hook signal of a specific frequency to the multiplexing device at the central office through each port;

Step 202, other users call the terminal connected to the multiplexing device at the user end, send a ringing signal from the port corresponding to the terminal through the analog access device, and send it to the multiplexing device at the user end through the multiplexing device at the central office;

Step 203, the ringing current module of the user end multiplexing device judges that the corresponding port receives the ringing signal according to the signal amplitude, and generates the ringing current and sends it to the terminal (phone);

Step 204, the terminal rings, and the user picks up the phone after hearing the ringing;

Step 205, the multiplexing device at the user end detects that the user is off-hook, adjusts the voltage and current output to the terminal, and stops sending an on-hook signal of a specific frequency on the port corresponding to the user;

Step 206, the central office multiplexing device detects that the on-hook signal of the corresponding port disappears, and the on-hook off-hook control module (receiving end) performs an off-hook action on the corresponding port.

Step 207, the simulated access device goes off-hook at the corresponding port, and starts a normal called conversation;

The multiplexing device at the user end modulates the analog voice information of different ports with different frequency offsets, and then transmits the modulated signal to the multiplexing device at the central office through the user's outside line; the multiplexing device at the central office performs analog voice information on different ports The demodulation of the corresponding frequency offset; on the contrary, the multiplexing equipment at the central office performs modulation of different frequency offsets, and the multiplexing equipment at the user end performs demodulation of the corresponding frequency offset.

Step 208, the call ends, and the user hangs up.

Step 209, the multiplexing device at the user end detects that the user is on-hook, adjusts the output voltage and current, and sends an on-hook signal to the multiplexing device at the central office through the port corresponding to the user's terminal;

In step 210, the central office multiplexing device detects the on-hook signal of the corresponding port, and the off-hook control module (receiving end) performs an on-hook action on the corresponding port.

Step 211, simulating the corresponding port of the access device to hang up, and the called service ends.

It corresponds to the operation flow of the aforementioned method, and for the deficiencies, please refer to the description of the aforementioned method, and details will not be repeated here.

The above description shows and describes a preferred embodiment of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various Various other combinations, modifications, and environments can be made within the scope of the inventive concept described herein, by the above teachings or by skill or knowledge in the relevant field. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (8)

1. A method for multiplexing analog subscriber line access, characterized in that it comprises: When one or more user terminals connected to the user terminal multiplexing device go off-hook, the user terminal multiplexing device stops sending an on-hook signal at the corresponding port of the user terminal; The multiplexing device at the user end modulates the analog voice information sent by the user terminal from the corresponding port with different frequency offsets, and then transmits it to the multiplexing device at the central office to receive and demodulate the corresponding frequency offset; the multiplexing at the central office After the device modulates the analog voice information sent by other user terminals from the corresponding port with different frequency offsets, it transmits it to the multiplexing device at the user end to receive and demodulate the corresponding frequency offset; After the user terminal hangs up, the multiplexing device at the user terminal resumes sending an on-hook signal at a corresponding port of the user terminal. 2. The method of claim 1, wherein The user terminals connected to the multiplexing device at the user end send respective on-hook signals to the multiplexing device at the central office through the corresponding port through the multiplexing device at the user end. 3. The method of claim 2, wherein The central office multiplexing device detects that the on-hook signal of the port disappears, and performs an off-hook operation on the port; The central office multiplexing device detects the on-hook signal of the port, performs an on-hook operation on the port, and ends the service. 4. The method according to claim 3, further comprising: The other user terminal calls the user terminal connected to the user terminal multiplexing device, and a ringing signal of a specific frequency sent by the port corresponding to the other user terminal is sent to the user terminal through the central office multiplexing device Multiplexing equipment; The multiplexing device at the user end judges the corresponding port according to the amplitude of the ringing signal, generates a ringing current and sends it to the corresponding user terminal connected to the multiplexing device at the user end; the user terminal rings, and the user goes off-hook. 5. An analog subscriber line access multiplexing system, characterized in that it comprises: user end multiplexing equipment and central office multiplexing equipment, wherein, The user terminal multiplexing device is used to connect one or more user terminals, stop sending the on-hook signal at its corresponding port when the user terminal is off-hook, and resume sending the on-hook signal at its corresponding port after the user terminal is on-hook It is also used to modulate the analog voice information sent by the user terminal from the corresponding port with different frequency offsets and then transmit it to the multiplexing device at the central office, and receive the analog voice information transmitted from the multiplexing device at the central office and perform Demodulation of the corresponding frequency offset; The central office multiplexing device is used to modulate the analog voice information sent by other user terminals from corresponding ports with different frequency offsets and then transmit it to the user terminal multiplexing device, and receive the transmission from the user terminal multiplexing device. The incoming analog voice information and demodulate the corresponding frequency offset. 6. The system of claim 5, wherein: The user end multiplexing device is configured to send respective on-hook signals sent by the user terminals connected to it through corresponding ports to the central office end multiplexing device. 7. The system of claim 6, wherein: When the central office multiplexing device detects that the on-hook signal of the port disappears, it performs an off-hook operation on the port; when it detects the on-hook signal on the port, it performs an on-hook operation on the port to end the service . 8. The system of claim 7, wherein: The central office multiplexing device is configured to send a ringing signal of a specific frequency sent by a port corresponding to the other user terminal to the user terminal when the other user terminal calls the user terminal connected to the user terminal multiplexing device. multiplexing the device to the client; The multiplexing device at the user end judges the corresponding port according to the amplitude of the ringing signal, generates a ringing current and sends it to the corresponding user terminal connected to the multiplexing device at the user end.

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