CN107659857B

CN107659857B - Method and equipment for realizing access of far-end telephone user to PBX based on FPGA

Info

Publication number: CN107659857B
Application number: CN201711030269.4A
Authority: CN
Inventors: 何传华; 蔡亦智; 肖利文
Original assignee: Shenou Communication Equipment Co ltd
Current assignee: Shenou Communication Equipment Co ltd
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2023-06-23
Anticipated expiration: 2037-10-30
Also published as: CN107659857A

Abstract

The invention relates to the technical field of communication, in particular to a method and equipment for realizing the access of a far-end telephone user to a PBX (private branch exchange) based on an FPGA (field programmable gate array). By applying the technical scheme of the invention, a far-end analog telephone terminal can be connected to gateway equipment through a telephone line, the gateway equipment is directly connected with a PBX host through Ethernet or optical fiber or is firstly connected with a PTN network, and then is connected with the PBX host through the PTN network, and the PTN label packet switching technology is adopted in communication, so that the purpose of enabling the far-end analog telephone terminal to be accessed to the PBX system and become an internal extension of the PBX is achieved. When the far-end telephone user is accessed into the PBX, compared with the method of multiplexing equipment such as a telephone channel multiplexer and the like on the market at present, the method and the equipment can remarkably reduce the deployment cost of the whole system.

Description

Method and equipment for realizing access of far-end telephone user to PBX based on FPGA

Technical Field

The invention relates to the technical field of communication, in particular to a method and equipment for realizing the access of a far-end telephone user to a PBX (private branch exchange) based on an FPGA (field programmable gate array).

Background

In the actual networking of voice communication equipment, there is often a demand for distributed networking, that is, telephone terminals at a plurality of points (branch offices and offices) which are far apart (a linear distance of 1Km or more) are connected into the same PBX; because the direct access distance of the analog telephone line is limited (not more than 1 Km), other equipment is required to access the remote extension telephone to the PBX, and the equipment cost of the current commercial solution is relatively high.

As shown in fig. 1, a scheme diagram on the market at present is shown, and the implementation process is as follows:

on the PBX side of the voice switch, the extensions to be extended to the far end are FXS_1 to FXS_8,8 extensions, and the 8 extensions are directly connected with the near-end multiplexing equipment; the near-end multiplexing equipment is connected with the far-end multiplexing equipment through an optical fiber; the remote multiplexing device restores FXS_1 to FXS_8 and then interfaces with the remote telephone, thereby achieving the purpose of accessing the remote telephone to the PBX.

The PBX side, FXS represents a user board card, is usually used for receiving telephone sets, and occupies more user boards as the telephone sets are more; in the figure, an extension port which needs to be extended to a far end is connected to multiplexing equipment at a near end;

the near-end multiplexing equipment can be docked with the extension ports of the PBX only by configuring an FXO board card, and the more the extension ports are, the more the FXO board card is correspondingly increased; the function of the near-end multiplexing equipment is that of analog-digital/digital-analog conversion; that is, the analog signal received from FXS port of PBX is converted into digital signal, which is sent to far-end multiplexing equipment through optical fiber; simultaneously, the digital signals received from the far-end multiplexing equipment through the optical fiber are restored to analog signals and sent to the FXS port of the PBX;

the near-end multiplexing equipment and the far-end multiplexing equipment are connected through special optical fibers, namely the optical fibers are exclusively used;

from the above description, it is known that in the scheme of fig. 1, the hardware used is configured with: (1) a PBX user board card; (2) a near-end multiplexing device; (3) far-end multiplexing equipment, more equipment is used; when the number of the far-end phones is increased, the number of the PBX end user boards is increased, the number of the near-end multiplexing equipment boards is increased, and the overall hardware cost of the scheme is obviously increased; in addition, the near-end multiplexing equipment and the far-end multiplexing equipment are in butt joint by using special optical fibers, so that relatively tense optical fiber resources are occupied; during engineering construction, PBX end users need to directly approach end multiplexing equipment, the more the number of paths is, the higher the construction complexity is, and the higher the overall cost of the scheme is.

Disclosure of Invention

The invention aims at the problems and provides a method and equipment for realizing the access of a far-end telephone user to a PBX based on an FPGA.

The technical scheme adopted by the invention is as follows: a method for implementing remote telephone subscriber access to a PBX (private branch exchange) based on an FPGA (field programmable gate array), comprising at least the steps of:

1. the process of sending signals by the analog phone used by the user is as follows:

analog telephone signals of a far end are subjected to analog-to-digital conversion, so that the analog telephone signals are converted into digital signals and further converted into a Pulse Code Modulation (PCM) code stream format;

the PCM code stream is sent to an FPGA, the FPGA receives the PCM code stream, performs corresponding processing, packages the PCM code stream into PTN data packets suitable for being transmitted in a PTN (packet transport network) network, and then sends the PTN data packets to a PBX;

on the PBX, the FPGA is used for receiving the PTN data packet, and the PTN data packet is restored into a PCM code stream and is connected into a switching network of the PBX, so that the signal transmission of the analog telephone of the far-end telephone user is completed;

2. the process of receiving signals by the analog telephone used by the user is as follows:

the PBX uses the FPGA to pack the PCM code stream distributed to the remote telephone user into PTN network data packet and sends out;

the remote end uses the FPGA to receive the PTN network data packet, and carries out corresponding analysis and then restores the PTN network data packet into a PCM code stream;

and then the PCM code stream is subjected to digital-to-analog conversion, and then the analog signal is sent to an analog telephone used by a user, so that the analog telephone of the remote telephone user receives the signal.

The process of sending signals by the analog telephone used by the user includes the steps that after the FPGA receives the PCM code stream, corresponding processing is carried out, and the method specifically includes:

after receiving the PCM code stream, the FPGA analyzes the data of each time slot in the code stream, separates the data according to the time slot number, stores the data in a cache RAM, stores the data in different queues according to the time slot number, and each queue corresponds to different RAM addresses;

and then, respectively packaging the parsed data stored in different queues into PTN network data packets, and transmitting the PTN network data packets to the PBX through the Ethernet or the optical fiber.

In the process of sending signals by using an analog telephone set, a PBX receives the PTN data packet by using an FPGA and restores the PTN data packet into a PCM code stream, which comprises the following steps:

after receiving the PTN data packets, the FPGA analyzes each data packet, carries out corresponding QoS processing on each data packet according to QoS information in each data packet, and caches the analyzed voice data into the RAM according to the queue number according to the information corresponding to the original PCM code stream time slot in each data packet, wherein the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses;

the FPGA then converts the data in each queue in the RAM into PCM code stream, and the PCM code stream is accessed into the switching network of the PBX, so that the signal transmission of the analog telephone of the remote telephone user is completed.

In the process that a user receives signals by using an analog telephone, the PBX uses the FPGA to pack the PCM code stream distributed to the remote telephone user into a PTN network data packet and sends the PTN network data packet out through the Ethernet or the optical fiber, and the method specifically comprises the following steps:

the FPGA analyzes the time slot information in the PCM code stream distributed to the remote telephone user, divides the PCM code stream into different queues according to time slot numbers, stores the queues into a cache RAM, and each queue corresponds to different RAM addresses;

and then, respectively packaging the analyzed data stored in different queues into PTN network data packets, wherein the PTN network data packets comprise time slot information, voice data and QoS information, and then transmitting the PTN network data packets to a far end through an Ethernet or an optical fiber.

In the process that a user uses an analog phone to receive signals, a remote end uses an FPGA to receive PTN network data packets, and the PTN network data packets are correspondingly analyzed and then restored into a PCM code stream, which comprises the following steps:

and then, the FPGA converts the data in each queue in the RAM into a PCM code stream, and then the PCM code stream is sent to the digital-to-analog conversion module for conversion, and the converted analog signals are sent to an analog phone used by a user.

An apparatus for implementing access of a far-end telephone user to a PBX based on FPGA at least comprises:

(1) A remote device comprising the following:

the analog-to-digital conversion module is used for performing analog-to-digital conversion on the far-end analog telephone signal to enable the analog telephone signal to be converted into a digital signal and further converted into a PCM code stream format; or the PCM code stream signal is restored into an analog signal and sent to an analog telephone of a remote telephone user;

the PCM code stream/PTN data packet processing module is used for packaging the PCM code stream into data packets suitable for transmission in the PTN network in the process of sending signals by the analog telephone; in the process of receiving signals by the analog telephone, the analog telephone is used for analyzing the received PTN network data packet and restoring the PTN network data packet into a PCM code stream;

the PTN data packet receiving and transmitting module is used for receiving/transmitting the PTN data packet;

(2) A PBX end device comprising:

the PCM code stream/PTN data packet processing module is used for analyzing the received PTN network data packet, restoring the PTN network data packet into a PCM code stream and accessing the PCM code stream into a switching network of the PBX in the process of sending signals by the analog telephone; during the process of receiving signals by the analog telephone, the PCM code stream is packed into data packets suitable for transmission in the PTN network;

and the PTN data packet receiving and transmitting module is used for receiving/transmitting the PTN data packet.

The analog-to-digital/digital-to-analog conversion module of the remote device is specifically configured to:

in the direction of sending signals by the far-end analog telephone, analog-to-digital conversion is carried out on the far-end analog telephone signal, so that the analog telephone signal is converted into a digital signal and further converted into a PCM code stream format; and/or the number of the groups of groups,

and in the direction of receiving signals by the remote analog telephone, the PCM code stream signals are restored into analog signals and are sent to the analog telephone of the remote telephone user.

The PCM code stream/PTN data packet processing module of the remote device is specifically configured to:

in the process of sending signals by a remote analog telephone, after receiving a PCM code stream, analyzing data of each time slot in the code stream, dividing the data according to time slot numbers, storing the data into a cache RAM, and storing the data into different queues according to the time slot numbers, wherein each queue corresponds to different RAM addresses; then, respectively packaging the parsed data stored in different queues into PTN network data packets;

in the process of receiving signals by a remote analog telephone, after receiving PTN data packets, analyzing each data packet, and carrying out corresponding QoS processing on each data packet according to QoS information in each data packet; according to the information corresponding to the original PCM code stream time slot in each data packet, the parsed voice information is cached into the RAM according to the queue number, the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses; the data in each queue in RAM is then converted to PCM streams.

The PTN data packet transceiver module of the remote device is specifically configured to:

in the process of sending signals by a remote analog telephone, a PTN network data packet is sent to PBX end equipment through an Ethernet or an optical fiber;

in the process of receiving signals by a remote analog telephone, receiving PTN network data packets through Ethernet or optical fibers;

the PTN data packet transceiver module of the PBX end device is specifically configured to:

in the process of sending signals by a remote analog telephone, receiving PTN network data packets through Ethernet or optical fibers;

in the process of receiving signals by the far-end analog telephone, PTN network data packets are sent to far-end equipment through Ethernet or optical fibers.

The PCM code stream/PTN data packet processing module of the PBX end device is specifically used for:

analyzing each PTN data packet sent by the remote equipment in the process of sending signals by the remote analog telephone, and performing corresponding QoS processing on each data packet according to QoS information in each data packet; according to the information corresponding to the original PCM code stream time slot in each data packet, the parsed voice information is cached into the RAM according to the queue number, the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses; then, converting the data in each queue in the RAM into PCM code stream and accessing into the switching network of the PBX;

in the process of receiving signals by a remote analog telephone, analyzing time slot information in a PCM code stream distributed to a remote telephone user by a PBX, dividing the time slot information into different queues according to time slot numbers, and storing the queues into a cache RAM, wherein each queue corresponds to different RAM addresses; and then, respectively packaging the analyzed data stored in different queues into PTN network data packets, wherein the PTN network data packets comprise time slot information, voice digital signals and QoS information.

The beneficial effects of the invention are as follows: by applying the technical scheme of the invention, only one special board card is required to be configured at the PBX side, thereby saving near-end multiplexing equipment in the prior art scheme and reducing the overall hardware cost; with the increase of the number of extensions to be extended to the far end, the hardware cost is unchanged at the PBX side, and the defect of steep increase of the hardware cost in the existing scheme is overcome; the special board card on the PBX uses an optical fiber or Ethernet interface to communicate with a remote gateway through a PTN network or a direct connection mode; the tight fiber resources are not exclusive. Compared with the prior art, the method can obviously reduce hardware cost and construction complexity in the whole scheme of realizing the access of the remote telephone to the PBX.

Drawings

FIG. 1 is a schematic diagram of a scheme currently on the market.

Fig. 2 is a schematic diagram of an embodiment of the present invention.

Fig. 3 is a flowchart of a method according to an embodiment of the present invention.

Fig. 4 is a block diagram of a remote gateway device shown in fig. 3.

Fig. 5 is a block diagram of a PBX-side dedicated board card shown in fig. 3.

Detailed Description

As described in the background art, in the prior art, more hardware devices are used, and when the number of remote phones is more, the number of PBX end user boards is increased, the number of near-end multiplexing device boards is increased, and the overall hardware cost of the scheme is obviously increased; in addition, the near-end multiplexing equipment and the far-end multiplexing equipment are in butt joint by using special optical fibers, so that relatively tense optical fiber resources are occupied; during engineering construction, PBX end users need to directly approach end multiplexing equipment, the more the number of paths is, the higher the construction complexity is, and the higher the overall cost of the scheme is.

In order to overcome the defects, the embodiment of the invention provides a method and equipment for realizing the access of a far-end telephone user to a PBX based on an FPGA, and by applying the technical scheme of the embodiment of the invention, only one special board card is required to be configured at the PBX side, thereby saving near-end multiplexing equipment in the prior art and reducing the overall hardware cost; with the increase of the number of extensions to be extended to the far end, the hardware cost is unchanged at the PBX side, and the defect of steep increase of the hardware cost in the existing scheme is overcome; the special board card on the PBX uses an optical fiber or Ethernet interface to communicate with a remote gateway through a PTN network or a direct connection mode, so that the special board card does not monopolize the optical fiber resources. By applying the technical scheme of the embodiment of the invention, only one special board card is required to be configured at the PBX side, thereby saving near-end multiplexing equipment in the prior art scheme and reducing the overall hardware cost; with the increase of the number of extensions to be extended to the far end, the hardware cost is unchanged at the PBX side, and the defect of steep increase of the hardware cost in the existing scheme is overcome; the special board card on the PBX uses an optical fiber or Ethernet interface to communicate with a remote gateway through a PTN network or a direct connection mode, so that the special board card does not monopolize the optical fiber resources.

Fig. 3 is a flowchart of a method provided in an embodiment of the present invention, specifically including:

the remote telephone is connected to the PBX to become an internal extension of the PBX, so that the remote telephone needs to communicate with the PBX, and the remote telephone can be distinguished according to the signal transmission direction in the process, and can respectively send signals and receive signals from the remote telephone in 2 directions, so that the flow chart can be analyzed.

In the direction in which the remote telephone sends signals, the method specifically comprises the following steps:

analog-to-digital conversion is carried out on the far-end analog telephone signal, so that the analog telephone signal is converted into a digital signal and further converted into a PCM code stream format signal; simulating an analog port number occupied by the telephone, corresponding to a time slot in the PCM code stream; (finally, after the PBX receives the signal, the extension number is corresponding to the PCM code stream time slot number;)

And then the PCM code stream is sent to the FPGA, and the FPGA receives the PCM code stream and performs corresponding processing, which specifically comprises the following steps:

firstly, analyzing the data of each time slot in the code stream, dividing the data according to time slot numbers, storing the data into a cache RAM, storing the data into different queues according to the time slot numbers, and enabling each queue to correspond to different RAM addresses;

then, the FPGA reorganizes the data which are analyzed and stored in different queues before packaging, mainly increases and perfects the data which are needed by packaging, and then packages the data in the queues into PTN network data packets respectively.

Then using Ethernet or optical fiber interface to send the PTN data packet to PBX through PTN network;

after receiving PTN data packets, an FPGA on a PBX special board analyzes each data packet, carries out corresponding QoS processing on each data packet according to QoS information in each data packet, and caches analyzed voice digital signals into a RAM according to a queue number according to information corresponding to an original PCM code stream time slot in each data packet, wherein the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses;

and then, the FPGA converts the data in each queue in the RAM into a PCM code stream and accesses the PCM code stream into a switching network of the PBX.

In this way, the signaling of the analog phone of the remote phone user is completed.

In the process of receiving signals by a remote telephone (in the direction of sending signals by a PBX end), the method specifically comprises the following steps:

the FPGA on the special board card of the PBX analyzes the time slot information in the PCM code stream distributed to the remote telephone user, and divides the PCM code stream into different queues according to the time slot number, and stores the queues into a cache RAM, and each queue corresponds to different RAM addresses;

then, respectively packaging the analyzed data stored in different queues into PTN network data packets, wherein the PTN network data packets comprise time slot information, voice data, qoS information and the like, and then transmitting the PTN network data packets to a far end through a PTN network by using an Ethernet or an optical fiber;

after receiving PTN data packets, the FPGA on the far-end gateway analyzes each data packet, carries out corresponding QoS processing on each data packet according to QoS information in each data packet, and caches analyzed voice data into the RAM according to the queue number according to the information corresponding to the original PCM code stream time slot in each data packet, wherein the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses; then converting the data in each queue into PCM code stream;

and then the PCM code stream is sent to a digital-to-analog conversion module for conversion, and the converted analog signal is sent to an analog telephone used by a user. In this way, the signal reception of the analog phone of the far-end telephone user is completed. The flow shown in fig. 3 is described above in terms of the 2 directions of receiving and sending signals from and to the analog phone of the remote phone user.

Fig. 4 is a block diagram of a remote device in the flowchart of fig. 3, specifically including:

(1) Analog-to-digital/digital-to-analog conversion module: analog-to-digital conversion is carried out on the far-end analog telephone signal, so that the analog telephone signal is converted into a digital signal and further converted into a PCM code stream format; or the PCM code stream signal is restored into an analog signal and sent to an analog telephone of a remote telephone user;

(2) PCM code stream/PTN packet processing module: in the process of sending signals by the analog telephone, the data of each time slot in the code stream are analyzed, separated according to the time slot number and stored in a cache RAM (random access memory), and stored in different queues according to the time slot number, each queue corresponds to different RAM addresses, then the analyzed data stored in different queues are subjected to data recombination before packaging, mainly the data required by packaging is increased and perfected, and then the data in the queues are respectively packaged into PTN (packet transport network) network data packets; in the process of receiving signals by the analog telephone, the analog telephone is used for analyzing each data packet after receiving the PTN data packet, carrying out corresponding QoS processing on each data packet according to QoS information in each data packet, caching the analyzed voice data into the RAM according to the queue number according to the information corresponding to the original PCM code stream time slot in each data packet, wherein the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses; then converting the data in each queue into PCM code stream;

(3) PTN data packet receiving and transmitting module: for receiving/transmitting PTN packets via a network cable or an optical fiber;

fig. 5 is a block diagram of a board card dedicated to the PBX side in the flow of fig. 3, specifically including:

(1) PTN data packet receiving and transmitting module: for receiving/transmitting PTN packets via a network cable or an optical fiber;

(2) PCM code stream/PTN packet processing module: in the process of sending signals by the analog telephone, the analog telephone is used for analyzing each data packet after receiving the PTN data packet, carrying out corresponding QoS processing on each data packet according to QoS information in each data packet, caching the analyzed voice data into the RAM according to the queue number according to the information corresponding to the original PCM code stream time slot in each data packet, wherein the queue number corresponds to the time slot number, and each queue corresponds to different RAM addresses; then converting the data in each queue into PCM code stream and accessing into the switching network of PBX; in the process of receiving signals of the analog telephone, the data of each time slot in the code stream allocated to the far-end analog telephone by the PBX are resolved, separated according to time slot numbers, stored in a cache RAM, and stored in different queues according to time slot numbers, each queue corresponds to different RAM addresses, the resolved data stored in different queues are recombined before being packed, the data needed by the packing is mainly increased and perfected, and then the data in the queues are respectively packed into PTN network data packets and are delivered to a PTN data packet transceiver module;

compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:

by applying the technical scheme of the embodiment of the invention, only one special board card is required to be configured at the PBX side, thereby saving near-end multiplexing equipment in the prior art scheme and reducing the overall hardware cost; with the increase of the number of extensions to be extended to the far end, the hardware cost is unchanged at the PBX side, and the defect of steep increase of the hardware cost in the existing scheme is overcome; the special board card on the PBX uses an optical fiber or Ethernet interface to communicate with a remote gateway through a PTN network or a direct connection mode, so that the special board card does not monopolize the optical fiber resources.

From the above description of the embodiments, it will be clear to those skilled in the art that the present invention may be implemented in hardware, or may be implemented by means of software plus necessary general hardware platforms. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium, and includes several instructions for causing a computer device to perform the method described in the various implementation scenarios of the present invention.

Those skilled in the art will appreciate that the drawing is merely a schematic illustration of a preferred implementation scenario and that the modules and flows in the drawing are not necessarily required to practice the invention.

Those skilled in the art will appreciate that modules in an apparatus in an implementation scenario may be distributed in an apparatus in an implementation scenario according to an implementation scenario description, or that corresponding changes may be located in one or more apparatuses different from the implementation scenario. The modules of the implementation scenario may be further split into a plurality of sub-modules.

The foregoing disclosure is merely illustrative of some embodiments of the invention, and the invention is not limited thereto, as modifications may be made by those skilled in the art without departing from the scope of the invention.

Claims

1. A method for realizing the access of a far-end telephone user to a PBX based on an FPGA is characterized by at least comprising the following steps:

analog-to-digital conversion is carried out on the far-end analog telephone signal, so that the analog telephone signal is converted into a digital signal and further converted into a PCM code stream format;

the PCM code stream is sent to an FPGA, the FPGA receives the PCM code stream, performs corresponding processing, packages the PCM code stream into PTN data packets suitable for transmission in a PTN network, and then sends the PTN data packets to a PBX;

then the PCM code stream is subjected to digital-to-analog conversion, and then an analog signal is sent to an analog telephone used by a user, so that the analog telephone of the remote telephone user receives the signal;

2. The method for implementing the access of the far-end telephone user to the PBX based on the FPGA according to claim 1, wherein the process of sending signals by the analog telephone used by the user is characterized in that the FPGA receives the PCM code stream and then carries out corresponding processing, and the method specifically comprises the following steps:

3. The method for implementing the remote telephone subscriber to access the PBX based on the FPGA of claim 1, wherein the PBX uses the FPGA to package the PCM code stream allocated to the remote telephone subscriber into a PTN network data packet and send the PTN network data packet out through the ethernet or the optical fiber during the process of receiving the signal by the subscriber using the analog telephone, specifically comprising:

4. The method for implementing the remote telephone user to access the PBX based on the FPGA according to claim 1, wherein the remote terminal uses the FPGA to receive the PTN network data packet and correspondingly analyze the PTN network data packet and restore the PTN network data packet to a PCM code stream during the process of using the analog telephone to receive the signal by the user, specifically comprising the following steps:

5. An apparatus for implementing access of a remote telephone user to a PBX based on an FPGA, comprising at least:

a remote device comprising the following:

a PBX end device comprising:

a PTN data packet transceiver module for receiving/transmitting PTN data packets,

6. The device for implementing the PBX access by the remote telephone subscriber based on the FPGA of claim 5, wherein the analog-to-digital/digital-to-analog conversion module of the remote device is specifically configured to:

7. The device for implementing PBX access by a remote telephone subscriber based on FPGA of claim 5, wherein the PCM code stream/PTN packet processing module of the remote device is specifically configured to:

8. The device for implementing PBX access by a remote telephone subscriber based on FPGA of claim 5, wherein the PTN packet transceiver module of the remote device is specifically configured to: