KR20040056382A - IP-PABX with multi-function switching module - Google Patents

Abstract

PURPOSE: An Internet phone exchange having a multi-function switching module is provided to perform a VoIP and packet data service by one module integrating several sheets of function boards. CONSTITUTION: An OAM(Operation and Administration management) board(210) performs maintenance and management. A router and LAN switch board(220) transmits and receives data by interfacing with WAN I/F(240). A PSTN interface(250) interfaces with PSTN network to perform VoIP and voice data service. An SLT(Subscriber Line Terminal) extension board(260) interfaces general SLT. A multi-functional switching module(230) TDM-switches subscriber data and converts an IP packet by interfacing with an IP extension board(270) connected to an IP extension subscriber, and transfers packet data to the router and LAN switch board(220).

Description

Internet telephone switchboard with multifunction switching module {IP-PABX with multi-function switching module}

The present invention relates to an Internet exchanger (IP-PABX), in particular an Internet exchange having a multi-function switching module to perform VoIP and packet data services in one module.

In detail, the multi-function switching module according to the present invention can perform VoIP and data services by mounting a central processing unit, a TDM switch, a packet converter, a bus controller, a DTMF receiver, a clock generator, a 10 / 100Base-T, and a Gigabit Ethernet interface therein. It would be.

1 is a block diagram of a conventional exchange system.

Referring to FIG. 1, the subscriber board 110 and the subscriber controller 120 for controlling the subscriber board, the message processor 130 for processing and transmitting a message related to a call, and all the controls related to call processing are handled. A clock for supplying and synchronizing with a controller and memory 140 for storing data, a tone generator 140 for generating DTMF tones, a DTMF tone receiver 160 for receiving DTMF tones, and a clock used in the system It is composed of a generation unit 170 and a switching unit 180 for connecting the communication path.

Referring to the conventional exchange system as described above is as follows.

Referring to FIG. 1, the exchange system 100 interfaces with a subscriber to perform connection control and management of a call and to connect a call path, and includes a subscriber board 110, a subscriber controller 120, a message processor 130, and a controller. And a memory 140, a tone generator 150, a DTMF receiver 160, a switching unit 170, a clock generator 180, and each functional element is implemented as one board or module. .

The subscriber board 110 exchanges data with the subscriber terminal, and the subscriber controller 120 actually controls the subscriber board 110. The subscriber board and the subscriber control board (110, 120) detects when the subscriber off-hook (off-hook) for the call, and transmits to the message processor 130. The message processor 130 processes the message related to the call and finally notifies the controller 140.

At this time, the central processing unit (CPU) of the control unit 140 instructs the call processing message for the call to perform the corresponding function for the call to each functional unit through the message processing unit 130.

The tone generator 150 transmits the tone generated from the tone generator 150, and receives the DTMF tone through the DTMF receiver 160 to recognize the phone number of the counterpart. When notifying the called party's telephone number thus recognized to the controller 140, the controller 140 controls the switching unit to connect the call path with the desired subscriber.

Conventional exchange system in the case of a large-capacity exchange, each processing unit (function unit) that handles the function for the call is composed of a single board or a module consisting of several boards (Board), as a whole It consists of multiple boards. In addition, in the case of small-capacity exchanger, each processing unit is made small and made as a single board, but due to limitations in its configuration, it is not easy to expand to a large capacity and only handle a small capacity. This makes it difficult to be competitively priced as a whole, and the complexity of the system does not guarantee reliability and stability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a multi-function switching module that enables to implement one switching module incorporating several boards in charge of various functions for voice call and data transmission in an Internet telephone exchange. Its purpose is to provide an internet telephone exchange having a.

Another feature is to provide an internet telephone exchange having a multifunction switching module which enables voice calls and data transmission by means of one switching module.

1 is a detailed configuration diagram of a conventional Internet telephone exchange.

2 is a block diagram showing a general Internet telephone exchange system.

3 is a block diagram showing an Internet telephone switch having a multi-function switching module according to an embodiment of the present invention.

4 is a block diagram illustrating a multifunction switching module in FIG. 3.

5 is a detailed configuration of the present invention Figure 4;

<Description of the symbols for the main parts of the drawings>

200 ... Internet changer 210 ... OAM board

220 ... Router and LAN Switch Board 230 ... Multifunctional Switching Module

240 ... Wan interface 250 ... PSTN interface

260 ... SLT Extension Board 270 ... IP Extension Board

310 Bus control unit 320 Control unit

330 ... TDM switch 340 ... DTMF receiver

350 ... IP packet converter 360 ... redundancy control

370 ... Ethernet Interface Unit 380 ... Clock Generator

Internet telephone switch having a multi-function switching module according to the present invention for achieving the above object,

OAM board for maintenance and management;

A router and a LAN switch board for packet data transmission / reception over an Internet network;

TDM switching and IP packets for subscriber data from the PSTN interface, which interfaces with the PSTN network to perform VoIP and voice data services, the SLT extension boards for matching general subscriber line terminal (SLT) subscribers, and the IP extension boards connected to the IP extension subscribers. And converting the packet data to a router and a LAN switch board.

Preferably, the multifunction switching module includes a bus controller for controlling bus bandwidth and usage rights, a controller for controlling the entire switching module and controlling each unit for receiving and transmitting data for call processing, and a PCM time slot in a node. IP packet data includes a TDM switch that has the capacity to switch, a call switching within a node, and transmits a system tone, a DTMF receiver that recognizes a DTMF dial of a subscriber transmitted from the TDM switch, and serial PCM data transmitted from the TDM switch as IP packet data. IP packet converter to convert, redundant control unit for operation in duplex mode, Ethernet interface unit to transfer IP packet data transmitted from IP packet converter to router and LAN switch board, and clock required inside module It includes a clock generator that supplies and generates a clock for synchronization with an external clock. And that is characterized.

Preferably, the control unit receives an operation program from an external hard disk, stores the operation program in an internal RAM program area, and downloads the DSP program of the DTMF receiver to a corresponding memory.

Preferably, the bus controller determines whether to permit a bus license request from the subscriber board, and divides the bus bandwidth by the number of lower boards to ensure the minimum value.

Preferably, the bus control unit functions as an IPC, the X-bus control unit for controlling the X-bus consisting of a plurality of control signals, the M-bus control unit for controlling the M-bus for managing the local board, and receiving And a packet RAM for storing packet data.

Hereinafter, with reference to the accompanying drawings as follows.

3 is a block diagram showing an Internet telephone exchange having a multifunction switching module according to an embodiment of the present invention.

Referring to FIG. 3, an OAM board 210 for maintenance and management, a WAN interface (WAN I / F) 240, and a router and LAN switch board 220 for packet data transmission / reception, VoIP And a PSTN interface 250 for interfacing with the PSTN network to perform voice data service, an SLT extension board 260 for matching a general subscriber line terminal (SLT) subscriber, and an IP extension board 270 connected to an IP extension subscriber. It is composed of a multi-function switching module 230 for converting subscriber data to TDM switching and IP packets and transferring the packet data to a router and a LAN switch board.

And, as shown in Figure 4, the multi-function switching module 230, the bus control unit 310 for controlling the bus bandwidth and usage rights, and the control unit for controlling the entire switching module and receives and transmits each part for receiving and transmitting data for call processing. DTDM dial of the subscriber transmitted from the control unit 320, the TDM switch 330 having the capacity for switching the PCM time slots in the node, the intra-node call switching and transmitting the system tone, and the TDM switch 330 A DTMF receiver 340 for recognizing the IP address, an IP packet converter 350 for converting serial PCM data transmitted from the TDM switch 330 into IP packet data, a redundancy control unit 360 for operation in a redundancy mode, An Ethernet interface unit 270 for transmitting IP packet data transmitted from the IP packet converter 350 to the router and the LAN switch board 220, and a clock required in the module. Class and a configuration including a clock generator 380 for generating a clock for an external clock and sync.

Referring to the accompanying drawings, an Internet telephone exchange having a multifunction switching module according to an embodiment of the present invention configured as described above is as follows.

2 is a block diagram illustrating a network of a general Internet telephone exchange system.

2, the Internet telephone exchange 100 is connected to a hub (HUB) 114 and a 10/100 Base Tee (10 / 100Base-T) to transmit / receive from the IP telephone 114 and the computer 115. Switching packet data is exchanged through the Internet network 112.

The voice transmitted / received to the general telephone 117 is switched to transmit and receive to the PSTN network 113.

3 is a block diagram of an Internet telephone switchboard having a multifunctional switching module according to the present invention.

As shown in FIG. 3, the OAM board 210 performs an operation and administration management (OAM) such as system failure and performance management, and the router and LAN switch board 220 programs a program from the OAM board. The packet data transmitted / received through the data and network interface 240 to the Internet network is transmitted / received to the multifunction switching module 230.

The multi-function switching module 230 is connected to the SLT extension board 260 matched with the general SLT subscriber and the IP extension board 270 matched with the IP extension subscriber to connect subscriber data to the TDM switch and It is connected to the PSTN interface 250 that converts the IP packet and interfaces with the PSTN network, and performs various functions for performing VoIP and data services.

As shown in FIG. 4, the multifunction switching module 230 includes a bus control unit 310, a control unit 320, a TDM switch unit 330, a DTMF receiver 340, an IP packet converter 350, and a redundancy control unit ( 360, the Ethernet interface unit 370, and the clock generator 380.

The bus controller 310 is an inter processor controller (IPC) of the system, and controls the arbitration and bus bandwidth of the bus right, and controls the CPU and the local board of the controller 320 in the exchange module. It is responsible for sending messages to the processor.

The control unit 320 controls the entire switching module, receives data for call processing from each functional element, and transmits call processing data to perform a corresponding function.

The TDM switch unit 330 transmits and receives PCM data to system highways RXHW and TXHW, switches local calls in nodes, and transmits system tones to the DTMF receiver 340.

The DTMF receiver 340 recognizes the DTMF dial pressed by the subscriber, which is connected to the control unit through the address and data bus and is transmitted from the TDM switch 330, and notifies the control unit 320.

The IP packet converter 350 is used in the case of a global call communicating with another node, and converts the 32 2 Mbps serial PCM data switched from the TDM switch 330 into IP packet data, and then the Ethernet interface unit 370. To send. The Ethernet interface unit 370 transmits the packet type voice and the message transmitted from the IP packet converter 350 to the router and the LAN switch board 330 through 10/100 base tee or Gigabit Ethernet. Receive the message.

The redundancy control unit 360 transmits the redundant data to the standby module as a redundancy signal, and the clock generator 380 supplies a clock required in the module and supports synchronization with an external clock.

The multifunction switching module 230 will be described in detail with reference to FIG. 5 as follows.

First, the controller 320 may include a central processing unit (CPU) 321, a DRAM 322, an SRAM 323, a booting ROM 324, and an address decoder ( 325, the central processing unit 321 is booted by the initial boot ROM 324, and the actual application program is downloaded from the hard disk (HDD) 201 shown in FIG. 3. That is, the application program stored in the hard disk 201 illustrated in FIG. 3 passes through the OAM board 210 and the Ethernet interface unit inside the multifunction switching module 230 via the high speed router and the LAN switch board 220 through Ethernet. 370 is received. When the received program data is converted into data in a packet form by the IP packet converter 250 and transmitted to the central processing unit 320, the central processing unit 321 downloads the data to the program area of the DRAM 322. Thereafter, the program is operated by the program of the DRAM 322.

In such an Internet telephone exchange 200, when a general subscriber picks up the handset for a call, the corresponding subscriber board 260 recognizes an off hook and transmits it to the multifunction switching module 230 through a message path. Will ask for a bus license.

At this time, the bus controller 310 sends a permission signal if the bus is not currently in use. Here, the bus controller 310 guarantees the minimum bandwidth divided by the number of boards (N) accommodated on the bus so that all lower boards can use the bus evenly, and other boards are using the bus. If not, allow the desired board to use the full bandwidth of the bus.

The bus control unit 310 includes an X-bus control unit 311, a packet RAM 312, an M-bus control unit 313, and a plurality of buffers 314 and 315. It has a bit data bus. The X-bus control unit 311 controls the X-bus composed of four control signals, and the M-bus control unit 313 is responsible for managing the local board through the M-bus.

When the X-bus controller 311 makes the packet data received from the X-bus to the buffer 315 into a packet and stores the packet data in the packet RAM 312, the central processing unit 321 stores the data stored in the packet RAM 312. After reading and analyzing, the TDM switch unit 330 transmits the dial tone from the tone source in the internal memory to the subscriber through the timeslots of the reception highways RXHW 0 to 31 of the subscriber.

In addition, the TDM switch unit 330 includes a TDM switch 331 and a buffer 332. When the subscriber presses a DTMF digit, the TDM switch unit 330 converts a cell into a PCM and transmits a transmission highway of the subscriber (TXHW 0 to 31). The time slot is converted to a transmission rate of 4Mbps and transmitted to the DTMF receiver 340.

The TDM switch 331 has a capacity capable of switching predetermined (1000) PCM time slots (32 highways) having a transmission rate of 64 kbps, and is responsible for call switching in a node.

The DTMF receiver 340 is connected to the control unit 320 by an address and data bus, and is composed of a digital signal processor (DSP) 341, a digital signal processor controller 342, and a plurality of program RAMs 343 and 344. The digital signal processor 341 operates by a program stored in the program ROM 343, and the central processing unit 321 initially downloads the DSP program stored in the boot ROM 324 to the program ROMs 343 and 344. Will load.

The digital signal processor 341 recognizes the digit by a digital filter of its own program and reports the value to the central processing unit 321 through the digital signal processor controller 342. The digital signal processor controller 342 receives the clock from the clock generator 380 to generate various clocks required for the digital signal processor 341 and allows the central processing unit 321 to download the DSP program into the program RAM. give.

In addition, the IP packet converter 350 converts the PCM data input from the TDM switch 331 into an IP packet and transmits the IP packet to the high speed router and the LAN switch board 220 through the Ethernet interface unit 370. Here, the Ethernet interface unit 370 includes a Gigabit Ethernet controller 371 and an RJ 45 372 to communicate with the router, the LAN switch, and the board 220 at high speed.

The redundancy control unit 360 controls redundancy in an active / standby mode between two switching module boards. The redundancy control unit 360 includes a redundancy and input / output unit 361 and a packet DRAM (DRAM) 362. If an active board fails, the board that was operating in standby detects it and allows it to operate in active mode.

The clock generator 380 supplies a clock required for the switching module and includes a clock logic 383 having an internal digital PLL, an oscillator (VCXO) 381, and an SRAM 382 for synchronizing with an external clock. It is composed.

As such, by performing a voice call and data transmission together using a multifunctional switching module in the Internet telephone exchange, there is no need to mount several boards as in the past.

As described above, according to the Internet telephone exchange having a multi-function switching module according to the present invention, a multi-function integrating several function boards in charge of various functions into a single switching module for voice call and data transmission in the existing exchange. In providing a switching module.

In addition, the voice call board and data transmission board are separated for voice call and data transmission, thereby simplifying functions, and having an advantage in price competitiveness.

Claims (5)

In the internet telephone exchange, OAM board for maintenance and management; A router and a LAN switch board for packet data transmission / reception over an Internet network; TDM switching and IP subscriber data between the PSTN interface, which interfaces with the PSTN network to perform VoIP and voice data services, the SLT extension boards for matching general subscriber line terminal (SLT) subscribers, and the IP extension boards that are connected to IP extension subscribers. And a multifunctional switching module for converting packets and delivering packet data to a router and a LAN switch board. The method of claim 1, The multi-function switching module includes a bus controller for controlling bus bandwidth and usage rights, a controller for controlling the entire switching module and controlling each unit for receiving and transmitting data for call processing, and for switching PCM time slots in a node. A TDM switch that has capacity and within-node call switching and transmits system tones, a DTMF receiver that recognizes the subscriber's DTMF dial from the TDM switch, and an IP to convert serial PCM data from the TDM switch into IP packet data. Packet converter, redundancy control unit for operation in redundancy mode, Ethernet interface for transmitting IP packet data transmitted from IP packet converter to router and LAN switch board, and clock required inside module Includes a clock generator that supplies a clock and generates a clock for synchronization with an external clock Internet telephone exchange of a multi-function switch module, characterized in that the. The method of claim 2, The control unit receives an operation program from an external hard disk, stores the program in an internal RAM, operates the program, and downloads a DSP program of a DTMF receiver to a corresponding memory. The method of claim 2, The bus control unit determines whether to permit a bus license request from a subscriber board, and divides the bus bandwidth by the number of lower boards and guarantees the minimum value. The method of claim 2, The bus control unit functions as an IPC, and the X-bus control unit for controlling the X-bus composed of a plurality of control signals, the M-bus control unit for controlling the M-bus for managing the local board, and receiving packet data An internet telephone exchange having a multifunction switching module comprising a packet RAM for storing.