KR20050052897A - Swiching system and method capable of supporting convergence service through interworking various network - Google Patents

Abstract

The present invention relates to a switching system and a method for providing an integrated service through interworking with various networks.

According to the present invention, when a call connection request is received from a subscriber station in a service area, the switch module includes a single board configured to connect a call path by switching an interface to an IP network, an AT network or a PST network according to the type of the requested call. It is provided.

Accordingly, the present invention provides a switching system for providing a call connection service to a plurality of subscribers, wherein the switching system embedded in the corresponding switching system, which is composed of several boards, is configured as a single board, and the subscriber call connection request in the service area is provided. By switching the interface according to the type of the requested call, it provides a call path interworking with the IP network, ATM network or PSTN network, thereby providing the subscribers of the switching system with an integrated service through interworking with various networks, as well as a switching system. This reduces the size of the exchange system, thereby reducing the volume and manufacturing cost of the exchange system.

Description

Switching system and method for providing integrated service through interworking with various networks {SWICHING SYSTEM AND METHOD CAPABLE OF SUPPORTING CONVERGENCE SERVICE THROUGH INTERWORKING VARIOUS NETWORK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching system, and more particularly to a switching system that provides a connection service to a plurality of subscribers by a single board. Switching system and method capable of providing integrated service through interworking with various networks which provide call paths interworking with IP network, ATM network or PSTN network by switching the interface according to the type of the requested call for subscriber call connection request It is about.

In general, the exchange system has an exchange function, a relay function, and a subscriber function, and is installed in an office, a factory, a school, a hospital, a government office, or a hotel by an individual or a corporation, and uses a circuit switching method to connect a predetermined line with a trunk line and an extension. Alternatively, by assigning between stations, a fast and accurate communication service is provided between terminals in the service area.

In particular, the switching system embedded in the switching system based on Asynchronous Transfer Mode (ATM) / IP (Internet Protocol), as shown in Fig. 1, includes a control unit 10, a memory unit 11, a clock generator ( 12), the tone generating unit 13, the subscriber control unit 14, the message processing unit 15, the switching unit 16, the DTMF (Dual Tone Multi-Frequency) receiving unit 17, and the subscriber board 18.

Here, the controller 10 is responsible for overall control related to call processing, the memory unit 11 stores various application programs and data for driving the system, and the clock generator 12 stores a system clock used in the system. It serves to supply and synchronize, the tone generator 13 generates various tones used in the system, the subscriber control unit 14 serves to control each subscriber board 18 connected to the system.

In addition, the message processing unit 15 processes and transmits various messages related to the call, the switching unit 16 connects the call paths according to the subscriber's request, and the DTMF receiving unit 17 is the subscriber board 18. Recognizes DTMF tones received through.

Hereinafter, an operation process of the prior art configured as described above will be described.

When the subscriber off-hooks his terminal for the call, the subscriber board 18 managing the subscriber and the subscriber controller 14 controlling the subscriber detect the off hook state and send the message to the message processor 15. The message processor 15 generates a message for call processing and finally reports it to the controller 10.

Then, the controller 10 outputs a control message through the message processor 15 to prepare for the call, and controls the tone generator 13 to transmit the tone to the subscriber.

Then, when the subscriber presses the desired telephone number, the control unit 10 receives the DTMF tone corresponding to the telephone number through the DTMF receiving unit 17 and recognizes the other party's telephone number, and accordingly, through the switching unit 16. Connect the call channel with the subscriber you want.

In this case, the conventional switching system as described above is classified into a large-capacity or small-capacity switching system according to the number of subscribers that can be processed. In the case of a large-capacity switching system, each of the units 10 to 17 includes a plurality of boards. The module or one board is mounted to perform a switching function. In the case of a small capacity exchange system, each unit 10 to 17 is mounted to one board to perform a switching function.

Therefore, in the conventional technology as described above, when the switching system embedded in the switching system that provides the call connection service to a plurality of subscribers is a large capacity, the switching function is performed by several boards, thereby increasing the volume and manufacturing cost. There was an increasing problem, and in the case of a small capacity, there was a problem in that expansion to a large capacity was not easy due to limitations in its own configuration.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and in a switching system for providing a call connection service to a plurality of subscribers, a single switching system embedded in the corresponding switching system composed of several boards is provided. The purpose of the present invention is to provide a system and method for providing a call path interworking with an IP network, an ATM network, or a PSTN network by switching an interface according to the type of the requested call for a subscriber call connection request in a service area. have.

In order to achieve the above object, the present invention, when a call connection request is received from a subscriber station in a service area, switches an interface to an IP network, an AT network or a PST network according to the type of the requested call to connect a call path. It characterized in that it comprises a switch module consisting of a single board.

In addition, when the call connection request is generated, analyzing the received dial tone to determine the type of the requested call; If the requested call is an extension call in a service area, connecting a call path through TDM switching; If not, it characterized in that it comprises the step of connecting the call path by switching the interface according to whether the call is connected to the AT network, IP network or PST network.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a configuration of a switching system capable of providing an integrated service through interworking with various networks of the present invention. As shown in FIG. 2, a time division multiplex (TDM) switch unit 100 and an asynchronous transfer mode are shown. ) Cell converter 101, memory 102, clock generator 103, dual tone multi-frequency (DTMF) receiver 104, controller 105, bus controller 106, utopia (UTOPIA, Universal) Test & Operation Physical layer Interface for ATM (ATM) interface unit 107, Segmentation And Reassymbly (SAR) 108, LAN (Local Area Network) interface unit 109, ATM / IP conversion unit 110, Eco agent Reject 111, E1 / T1 interface 112, ATM / E1T1 converter 113.

And, as shown in Figure 4, the operation of the present invention, when the call connection request occurs by analyzing the received dial tone to confirm the type of the requested call (S40, S41); When the requested call is an extension call in the service area, connecting the call paths through TDM switching (S42 and S43); If not, it configures the steps (S44 to S49) by switching the interface according to whether the call is connected to the ATM network, IP network or PSTN network.

When the call connection request is received from the subscriber station in the service area, the switching system of the present invention switches the interface to the IP network, the AT network or the PST network according to the type of the requested call. The function block is composed of a switch module composed of one board, and is embedded in a private branch exchange (PBX) system and a general switching system, and the interface is switched according to the type of call requested by the subscriber in the service area to make a call. By connecting the network, it is possible to interwork with the IP network, ATM network or PSTN (Public Switched Telephone Network) network to provide an integrated service with each network.

In the switching system of the present invention consisting of a switch module composed of one board, the TDM switch unit 100 switches an extension call generated at a subscriber station in a service area of the switching system and receives voice PCM (Pulse Code Modulation) from the subscriber station. It receives data and transmits tones generated in the system.

In addition, the ATM cell converter 101 includes first-in-first-out (FIFO), PCM converter, cell converter, memory, various buffers, etc., and receives voice PCM data received through the TDM switch unit 100. And converts the converted ATM voice cell into vice versa, and transmits the converted ATM voice cell to the utopia interface unit 107.

The memory unit 102 stores various programs and data for system operation, and the clock generator 103 supplies a clock required for driving the system and synchronizes with an external clock. The DTMF receiver 104 ) Recognizes the DTMF digit received from the subscriber and reports it to the controller 105.

In addition, the control unit 105 not only takes charge of overall control related to call processing, but also confirms the type of call currently requested according to the report of the DTMF receiving unit 104, and accordingly, the IP network, the ATM network, or the PSTN network. Switch the interface to connect the call through the interface.

In addition, the bus controller 106 is an inter-processor controller (IPC) of a system composed of an X-bus and an M-bus, and controls and transmits information of the system through parallel and serial communication between the controller 105 and a processor of a lower board. The Utopia interface unit 107 is composed of a SONET framer and a transceiver, and the ATM voice cell received from the ATM cell converter 101 or the SAR 108. Alternatively, the ATM data cell is transmitted to the ATM cell switching block of the switching system through the 155 Mbps Unchielded Twisted Pair (UTP) 5 link, or vice versa.

In addition, the SAR 108 converts the ATM data cell received from the utopia interface unit 107 into a message for control and information transmission of the system and transmits the message to the control unit 105, and the ATM cell is converted into an ATM cell converter. It serves to deliver to 101.

In addition, the echo canceling unit 111 removes an echo generated during a call between the IP network and the PSTN network, and the ATM / IP converting unit 110 receives the ATM cell converting unit 101 or the SAR 108. The converted ATM voice cell or ATM data cell is converted into an IP packet and transmitted to the IP network through the LAN interface unit 109, where the LAN interface unit 109 supports Ethernet 10 / 100BT.

The ATM / E1T1 converter 113 converts an ATM voice cell or an ATM data cell received from the ATM converter 101 or the SAR 108 into an E1 or T1 frame in a TDM format and converts the E1 / T1 interface into an E1 / T1 frame. 112) to the PSTN network.

On the other hand, Figure 3 shows an example of configuring a private exchange system by applying the switching system of the present invention to the exchange system, the first exchange system 200 located in the head office and the second exchange system 300 located in a branch away from the head office a predetermined distance ) Is connected to the IP network 400, the PSTN network 500, or the ATM network 600, and the respective networks 400 to 600 according to the type of call requested by the subscriber in the service area of the corresponding switching system 200 and 300). In conjunction with, the call path is connected.

In this case, the switching systems 260 and 360 embedded in the exchange system 200 and 300 are configured as one board to enable interworking with each of the networks 400 to 600.

First, for the operation of the present invention, the control unit 105 in the switching system 260 and 360 downloads various application programs from the storage means 210 and 310 in each exchange system 200 and 300 and stores them in the memory unit 102. The program is transmitted to the LAN interface unit 109, 230, 330 through the OAM (Operation & Administration Maintenance) board (220, 320) and then converted into an ATM cell in the ATM / IP conversion unit 110 is transferred to the control unit 105 through the SAR (108) Then, it is finally stored in the memory unit 102 and executed.

Next, when the 'general subscriber 1' connected to the switching system 260 lifts the handset to request a call connection (S40), the extension board 270 connected to the corresponding 'general subscriber 1' is off-hook. The bus controller 106 requests a bus license to the bus controller 106 in the switching system 260. Accordingly, when the bus is not currently in use, the bus controller 106 sends a bus permission signal to the corresponding station board 270. Will be used to perform the subsequent call connection procedure.

Here, the bus control unit 106 ensures this minimum value by making the minimum value obtained by dividing the number of boards currently accommodated by the bus transmission bandwidth by the total bandwidth so that all lower extension boards can use the bus evenly. If no other boards are in use, the board that wants to use the bus controls the limited bandwidth on the bus to use the maximum available bandwidth.

Then, when the 'Normal subscriber 1' attempts to connect to the call in earnest by pressing the DTMF digit, the TDM switch unit 100 converts the TXHW time slot of the subscriber to a transmission rate of 4 Mbps and converts the received DTMF digit into the DTMF. The DTMF receiver 104 recognizes the received DTMF digit and reports it to the controller 105.

Then, the controller 105 analyzes the received and reported dial tone to confirm the type of the requested call (S41).

If the requested call is an extension call of 'general subscriber 2' or 'IP extension subscriber 1' located in the service area of the corresponding first switching system 200 (S42), the controller 105 includes a TDM switch unit. TDM switching through the 100 connects the call path with the corresponding 'general subscriber 2' or 'IP extension subscriber 1' (S43).

In addition, if the requested call is to talk to the general subscriber 3 or 4 or the IP extension subscriber 2 of the second switching system 300 in addition to the service area of the corresponding switching system 200, the controller 105. ) Is connected to the IP network 400, PSTN network 500 or ATM network 600 in accordance with the type of the requested call to connect the call path.

That is, if the requested call is a call connected to the ATM network 600, a message for controlling and transmitting information of the system is converted from the SAR 108 to the ATM data cell, and the voice PCM data is transferred from the ATM cell converter 101 to the ATM. After the voice cell is converted into a voice cell, the converted ATM cell is transmitted to the ATM network 600 through the utopia interface unit 107 and transferred to the second switching system 300 to connect the call paths (S44 and S45).

Then, if the call is connected to the IP network 400, the message or voice PCM data is converted into ATM data or voice cell in the SAR (108) and ATM cell conversion unit 101, respectively, and then ATM / IP conversion unit 110 Is converted into an IP packet and transmitted to the second switching system 300 through the LAN interface unit 109 and the IP network 400, thereby connecting the call paths (S46 and S47).

Similarly, if the call is connected to the PSTN network 500, the ATM cell converted by the SAR 108 and the ATM cell converter 101 is converted into an E1 / T1 frame format through the ATM / E1T1 converter 113. The PSTN network 500 transmits the call paths (S48 and S49).

As described above, the present invention provides a switching system for providing a connection service to a plurality of subscribers by using a single board by switching a built-in switching system included in a plurality of boards into a single board. By providing a call path interworking with an IP network, ATM network or PSTN network by switching the interface according to the type of the requested call for the call connection request, the subscriber of the switching system provides an integrated service through interworking with various networks. Of course, the size of the switching system is reduced, thereby reducing the volume and manufacturing cost of the exchange system.

1 is a block diagram showing the configuration of a switching system embedded in a conventional ATM / IP based switching system.

Figure 2 is a block diagram showing the configuration of a switching system capable of providing integrated services through interworking with the various networks of the present invention.

Figure 3 is a network configuration showing an example of configuring a private exchange system by applying a switching system capable of providing integrated services through interworking with the various networks of the present invention.

4 is a flow chart illustrating an operation process of a switching method capable of providing an integrated service through interworking with various networks of the present invention.

*** Description of the symbols for the main parts of the drawings ***

100: TDM switch unit 101: ATM cell conversion unit

102 memory unit 103 clock generator

104: DTMF receiving unit 105: control unit

106: bus control unit 107: utopia interface unit

108 SAR 109 LAN interface unit

110: ATM / IP conversion unit 111: echo cancellation unit

112: E1 / T1 interface unit 113: ATM / E1T1 conversion unit

Claims (3)

When a call connection request is received from a subscriber station in the service area, the switch module includes a single board configured to connect a call path by switching an interface to IP network, ATM network or PST network according to the requested call type. Switching system capable of providing integrated service through interworking with various networks. 2. The apparatus of claim 1, wherein the switch module comprises: a TDM switch unit for switching an extension call generated from a subscriber station in a service area and receiving voice PCM data from the subscriber station; An AT cell conversion unit for converting the received PCM data into an AT cell, or vice versa; A DMP receiver for recognizing a DFT digit received from the subscriber station; A controller for checking a type of a call currently requested to be connected according to the recognized DMP, and switching an interface to an IP network, an AT network or a PST network to connect a call path; A Utopia interface unit for transmitting and receiving an ATM voice and data cell to the outside under the control of the controller; An AT data cell transmitted / received from the utopia interface unit is converted into a message for control and information transmission of a system and transmitted to the controller, and an AT voice cell is transmitted to the AT cell conversion unit; An ATM / IP converter for converting an AMT voice or data cell received from the AMT cell converter or SL under the control of the controller to an IP packet and transmitting the IP packet to an IP network through a LAN interface; Under the control of the controller, the AMT voice or data cell received from the AT cell conversion unit or SL is converted into a T1 E1 or T1 frame and transmitted to the PTI network through the E1 / T1 interface. Switching system capable of providing integrated services through interworking with a variety of networks, characterized in that the AMT / E1T1 conversion unit. When a call connection request occurs, analyzing the received dial tone to determine the type of the requested call; If the requested call is an extension call in a service area, connecting a call path through TDM switching; If not, providing integrated services through interworking with various networks, comprising the step of connecting the call paths by switching the interface according to whether the call is connected to ATM network, IP network or PST network. Possible switching method.