KR19980040993A - Virtual Channel Formation Device of ATM Switch - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Virtual Channel Formation Device of ATM Switch

2. The technical problem to be solved by the invention

The LIM board of the conventional ATM switch uses a header portion of an ATM 쎌 to form a virtual channel, wherein the central processing unit forms a virtual channel by updating a table in an address translation controller to form a new virtual channel. This is to reduce the rim board burden caused by.

3. Summary of Solution to Invention

Finding the starting position of the cell from the data stream obtained from the processor, extracting the cell header information, and delivering the cell header information to the address translation controller, and transmitting the data with the new header and routing tag obtained from the address translation controller to the switching module. A network termination controller for removing routing tags of data transmitted from the module; An address translation control unit for analyzing the cell header information obtained from the network termination control unit and adding a new header and a routing tag to feed back to the network termination control unit; It analyzes the routing tag added on the header of ATM 쎌 obtained from the network termination controller and transmits the modified setup signal to the call processing module, and transmits the internal packet transmitted from the call processing module to the central processing unit through the network termination controller. A switching module configured to; A call processing module which feeds new VPI / VCI information and routing tag information to the payload part of ATM 'according to the internal data table according to the modified setup signal obtained from the switching module and feeds back to the switching module as an internal packet; And a central processing unit for updating a table in the address translation control unit with internal packets obtained through the switching module and the network termination control unit.

4. Important uses of the invention

It is applied to an ATM exchange that delivers information by forming a virtual channel.

Description

Virtual Channel Formation Device of ATM Switch

In general, the ISDN ATM exchanger integrates the existing line mode digital and packet mode communication schemes, and transfers information after forming a virtual channel by loading an information signal on an ATM.

In this case, the header portion of the ATM 쎌 is used to form a virtual channel. An existing limb (LIM) board for forming such a virtual channel is illustrated in FIG.

As shown, the line driver 10 receives the data of the video terminal adapter or analog terminal adapter input through the UTP-3 cable and transmits the transmission data to the video terminal adapter or the analog terminal adapter through the UTP-3 cable. Wow; The data transmission / reception unit 20 converts the dual data obtained from the line driver 10 into single data, extracts a clock from the input data, converts the transmission single data into dual data, and transfers the data to the line driver 10. Wow; A post processing unit (30) for converting serial data obtained from the data transmission / reception unit (20) into coding and parallel data so as to be processed later, and converting parallel transmission data into serial data and transmitting the serial data to the data transmission / reception unit (20); From the data stream obtained from the word processor 30, the start position of the word is found, cell header information is extracted and transmitted to the address translation control unit 60, and a new header and routing tag obtained from the address translation control unit 60 are added. A network termination controller 50 which transmits the data to the switching module 70 and removes the routing tag of the data transmitted from the switching module 70; An interface unit 40 interposed between the network termination controller 50 and the microprocessor 30 to interface data with each other; An address translation controller 60 for analyzing the cell header information obtained from the network termination controller 50 and adding new headers and routing tags to feed back to the network termination controller 50; A central processing unit (80) for initializing the control registers of the network termination control unit (50) and the address translation control unit (60) and updating the table of the address translation control unit (60); A ROM (90) for storing a program for initializing the control registers in the network termination controller (50) and the address translation controller (60); The RAM 100 is configured to store data for updating the address translation control unit 60.

Referring to the operation of the rim (LIM) board of the conventional ATM switch configured as described above is as follows.

First, the UTP-3 cable is connected to the V-TA or A-TV on the subscriber side, and when the power is supplied to the line interface module (LIM), the central processing unit 80 stores the network termination controller 50 stored in the ROM 90. ) And the network termination control unit 50 and the address translation control unit 60 by a program for initializing the control register of the address translation control unit 60.

When receiving data in such a state, when the V transmitted from the V-TA or the A-TA is transmitted to the line driver 10 through the UTP-3 table, the line driver 10 receives the data transmission and reception unit ( 20) to pass.

The data transmission / reception unit 20 takes the received double data and converts it into single data, extracts a clock from the input data, and transmits the clock together with the single data processed by the power processor 30.

In this case, a clock of 19.44MHa is applied to the data transmission / reception unit 20 to adjust the speed of 1.944Mbps.

The processor 30 encodes the received data obtained from the data transceiver 20 by the 5B / 4B coding method that codes 5 bits into 4 bits, thereby lowering the data rate to 15.552 Mbps. The data is converted into data and transmitted to the interface unit 40 at 1.944Mbps * 8.

Then, since the input / output pins between the processor 30 and the network termination controller 50 are different from each other, the interface unit 40 appropriately transfers the input data to the network termination controller 50 at the rear end so that data transfer is smoothly performed between the two units. give.

The network termination control section 50 then finds the start of the char from the data stream using the header error check (HEC) byte in the char header and performs a single bit correction of the header.

The adjusted data is temporarily stored in an internal buffer capable of storing ten cells, and the four-byte header except for the HEC byte is extracted and transmitted to the address translation control unit 60.

The address translation control unit 60 interprets the input ATM # header information at high speed and adds a new header and a routing tag.

That is, the virtual path identification number and the virtual channel identification number in the ATM header are changed, and a routing tag having a size of 3 bytes is added to feed back the data input to the network termination controller 50.

Then, the network termination controller 50 transmits the new header to be fed back to the switching module 70 including the new header and the 3-byte routing tag, and the switching module 70 switches it to another subscriber. .

The switched data is transferred to the network termination controller 50 again, the routing tag is removed, and the transfer data is transferred to the power processor 30 through the interface unit 40 described above.

쎌 processing unit 30 operates in the inverse of the receiving operation, encodes 8-bit parallel data by 4B / 5B coding technique to increase the data rate to 19.4 Mbps, converts into serial data, and returns to data transmission / reception unit 20. To pass.

Then, the data transceiver 20 transmits the input data to the line driver 10, and the line driver 10 transmits the transmitted data to the subscriber to receive the transmission.

However, the LIM board of such a conventional ATM switch uses a header portion of an ATM 쎌 to form a virtual channel, wherein the central processing unit updates the table in the address translation controller to form a new virtual channel. There was a problem that the role of the rim board is increased because it forms.

In particular, when designing a large-capacity switch, there is a problem in that the burden of a rim is further increased because address translation in the address translation controller for forming the virtual channel must be performed in each rim.

Therefore, the present invention has been proposed to solve the above problems of the prior art,

An object of the present invention is to generate an internal packet in a call processing module (CPM) and to update an address translation controller (ATC) table in a LIM board. The present invention provides a virtual channel forming apparatus of an ATM exchanger that reduces the burden of the lim and increases the efficiency of management by forming the virtual channel by converting the portions.

Technical means for achieving the object of the present invention,

Finding the starting position of the cell from the data stream obtained from the processor, extracting the cell header information, and delivering the cell header information to the address translation controller, and transmitting the data with the new header and routing tag obtained from the address translation controller to the switching module. A network termination controller for removing routing tags of data transmitted from the module;

An address translation controller for analyzing cell header information obtained from the network termination controller and adding new headers and routing tags to the network termination controller;

Analyzes the routing tag added on the header of ATM 쎌 obtained from the network termination controller, transmits the modified setup signal to the call processing module, and sends the internal packet transmitted from the call processing module to the central processing unit through the network termination controller. A switching module for transmitting;

According to the modified setup signal obtained from the switching module, a new virtual path identification number (VPI), a virtual channel identification signal (VCI), and routing tag information are loaded on the payload portion of the ATM according to an internal data table, and the packet is stored as an internal packet. A call processing module for feeding back to the switching module;

And a central processing unit for updating a table in the address translation control section with an internal packet obtained through the switching module and the network termination control section.

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

1 is a block diagram of a rim (LIM) board of a conventional ATM switch;

Figure 2 is a block diagram of a virtual channel forming apparatus of the ATM switch according to the present invention.

Explanation of symbols on the main parts of the drawings

30; Pretreatment section 50; Network termination control

60; Address translation control unit 80; Central Processing Unit

110; Call processing module 111; Adaptation Layer Controller

2 is a block diagram of a virtual channel forming apparatus of an ATM switch system according to the present invention.

As shown. A line driver 10 which receives data of a video terminal adapter or an analog terminal adapter input through a UTP-3 cable and transmits transmission data to the video terminal adapter or an analog terminal adapter through the UTP-3 cable; The data transmission / reception unit 20 converts the dual data obtained from the line driver 10 into single data, extracts a clock from the input data, converts the transmission single data into dual data, and transfers the data to the line driver 10. Wow; A data processing unit (30) for converting serial data obtained from the data transmission / reception unit (20) into coding and parallel data so as to be processed at a later stage, and converting parallel transmission data into serial data and transmitting the serial data to the data transmission / reception unit (20); From the data stream obtained from the word processor 30, the start position of the word is found, cell header information is extracted and transmitted to the address translation controller 60, and a new header and routing tag obtained from the address translation controller 60 are added. A network termination controller 50 which transmits the data to the switching module 70 and removes the routing tag of the data transmitted from the switching module 70; An address translation control unit 60 for analyzing the cell header information obtained from the network termination control unit 60 and adding new headers and routing tags to feed back to the network termination control unit 50; The network termination controller 50 analyzes the routing tag added on the header of ATM 쎌 obtained from the network termination controller 50, transmits the modified setup signal to the call processing module, and transmits the internal packet transmitted from the call processing module. Switching module 70 for transmitting to the central processing unit 80 through; The new VPI / VCI information and the routing tag information are loaded into the payload portion of the ATM according to the internal data table according to the modified setup signal obtained from the switching module 70 to feed back to the switching module 70 as an internal packet. Call processing module 110; A central processing unit (80) for updating a table in the address translation control unit (60) with an internal packet obtained through the switching module (70) and the network termination control unit (50); An interface unit 40 interposed between the microprocessor 30 and the network termination controller 50 to interface data with each other; A ROM (90) for storing a program for initializing the control registers in the network termination controller (50) and the address translation controller (60); The RAM 100 is configured to store data for updating the address translation control unit 60.

In the above, the call processing module 110 transmits the modified rating tag obtained from the switching module 111 to the microprocessor 115 and the data stored in the SAR memory 112 under the control of the microprocessor 115. Based on the table, new adaptation layer controller 111, which feeds new VPI / VCI information and routing tag information to the payload part of ATM 'and feeds back to the switching module 70 as an internal packet, and the system memory 113, An input / output unit 114 for data input / output with a device and a microprocessor 115 for controlling the adaptation layer controller 111 to generate an internal packet.

Referring to the operation of the virtual channel forming apparatus of the ATM switch according to the present invention configured as described above are as follows.

First, in order for traffic to be transmitted and received, a setup signal must be generated at each terminal adapter to form a call path.

Therefore, when a setup signal is generated at each terminal adapter to form a call, this is a line driver 10, a data transceiver 20, a processor 30, an interface 40, and a network termination controller 50 in the rim board. Are sequentially input to the address translation control unit 60.

The address translation control unit 60 then interprets the input ATM # header information at high speed and adds a new header and routing tag.

That is, the virtual path identification number and the virtual channel identification number in the ATM header are changed, and a routing tag having a size of 3 bytes is added to feed back the data input to the network termination controller 50.

Then, the network termination controller 50 transmits the packet including the new header to be fed back and the 3-byte routing tag to the switching module 70, and the switching module 70 adds the routing tag added on the ATM header. See and transmits the modified setup signal to the call processing module (110).

The call processing module 110 receives the modified setup signal from the adaptation layer controller 111 and transmits the modified setup signal to the microprocessor 115.

That is, the adaptation layer controller 111 converts the ATM transmitted from the switching module 70 to the general processor and transmits the converted ATM to the microprocessor 115, and converts the general ATM into the ATM and feeds it to the switching module 70. It plays a role of whitening.

Meanwhile, the microprocessor 115 checks this to control the adaptation layer controller 111, and the adaptation layer controller 111 uses a new virtual path identification number [VPI] using the data table stored in the SAR memory 112. ], The virtual channel identification signal [VCI], and routing tag information are loaded on the Payload portion of ATM 'to feed back to the switching module 70 described above.

The ATM generated at this time is called an internal packet, and the internal packet is retransmitted to the onboard board, where the VCI value of the header is set to 0 * 00, 0 * 00, 0 * 00, 0. By changing the value to * 80, it can be made into a user defined value.

The reason for making the user determinant in the above is to allow this packet to be extracted by the network termination controller 50 of the rim LIM.

Therefore, the network termination control unit 50 extracts the internal packet transmitted through the switching module 70 and stores it in the RAM 100, and the central processing unit 80 is internal to the RAM 100 as described above. When the packet is stored, when the DREQ pin of the address translation control unit 60 becomes high, the table in the address translation control unit 60 is updated based on the stored data.

When the table in the address translation control unit 60 is updated, new VPI / VCI can be received when traffic comes in.

On the other hand, the call processing module 110 generates an internal packet even when a release signal is received from each terminal adapter, and this internal packet also operates in the address translation control unit 60 as described above when the setup signal arrives. Free the table.

As described above, according to the present invention, since the call processing module (CPM) collectively has a virtual path identification number (VPI), a virtual channel identification signal (VCI), and a routing tag table, the burden on the rim (LIM) is reduced. There is an effect that can increase the effectiveness of the management compared to the lims (LIM) individually.

The present invention relates to the virtual channel formation of an ATM exchange for an ISDN, and more particularly, to generate an internal packet from a call processing module (CPM) and to generate an address translation controller (ATC) in a rim board. Controller) A virtual channel forming apparatus of an ATM switch which reduces the burden of LIM and increases the efficiency of management by converting the header portion of the bank by a method of updating a table. .

Claims (3)

In the ATM switch which transfers data after forming a virtual channel by carrying an information signal on the ATM 쎌, From the data stream of the input X, find the starting position of X, extract the cell header information, and transfer it to the address translation control unit 60, and the new header and routing tag data obtained from the address translation control unit 60 are added to the switching module. A network termination controller 50 for transmitting to the 70 and extracting and storing the internal packet transmitted from the switching module 70 in the RAM 100; An address translation controller 60 for analyzing the cell header information obtained from the network termination controller 50 and adding new headers and routing tags to feed back to the network termination controller 50; It analyzes the routing tag added on the header of ATM 쎌 obtained from the network termination controller 50, transmits the modified setup signal to the call processing module 110, and transmits the internal packet transmitted from the call processing module 110. A switching module 70 for transmitting to the network termination controller 50; The new virtual path identification number (VPI), the virtual channel identification signal (VCI), and the routing tag information are loaded on the payload part of the ATM according to the internal data table according to the modified setup signal obtained by the switching module 70. A call processing module (110) for feeding back to the switching module (70) as a packet; And a central processing unit (80) for updating a table in the address translation control unit (60) with internal packets stored in the RAM (100). The method of claim 1, wherein the call processing module 110, The modified routing tag obtained from the switching module 111 is transmitted to the microprocessor 115 and a new virtual path identification number (VPI) is based on the data table stored in the SAR memory 112 under the control of the microprocessor 115. ), An adaptation layer controller 111 for feeding back virtual channel identification signal (VCI) and routing tag information to the payload portion of ATM 'to feed back to the switching module 70 as an internal packet, system memory 113, And a microprocessor (115) for controlling an adaptation layer controller (111) to generate an internal packet. The method of claim 1 or 2, wherein the call processing module 110, Virtual channel forming apparatus of the ATM switch, characterized in that to generate an internal packet to release the table in the address translation control unit 60, even when a release signal (Release Signal) in each terminal adapter.