KR20060069667A - Method for cell transmission in exchange system of asynchronous transmission mode - Google Patents

Abstract

The present invention provides a cell transmission method in an asynchronous transmission system switching system, comprising: a first step of determining whether a cell transmission command is received from an operator through an EMS in an asynchronous transmission system switching system; A second step of determining whether a connection in the asynchronous transmission mode switching system is a valid connection if the command is a cell transmission command; A third step of adjusting a cell transmission rate by calculating a cell transmission rate if the connection is a valid connection; A fourth step of determining whether there is a transmission stop command after the third step; A fifth step of transmitting a cell and then returning to the fourth step if there is no transmission stop command in the fourth step; If there is a transmission stop command in the fourth step, and comprises a sixth step of reporting the cell transmission result, the cell transmission using the software in the asynchronous transmission switching system without using an external instrument in actual operation You will be able to simulate any asynchronous transfer connection in progress.

Description

Method for cell transmission in exchange system of asynchronous transmission mode

1 is a block diagram of a general asynchronous transfer mode switching system,

2 is a flowchart illustrating a cell transmission method using a test connection in a control unit in a conventional asynchronous transmission method switching system.

3 is a flowchart illustrating a cell transmission method using an IPC connection in a control unit in a conventional asynchronous transmission system switching system,

4 is a flowchart illustrating a cell transmission method in an asynchronous transmission system switching system according to the present invention;

Figure 5 is a block diagram showing a connection configuration for the test of the asynchronous transmission system switching system to which the present invention is applied,

Figure 6 is a block diagram showing a connection configuration for the IPC of the asynchronous transmission system switching system to which the present invention is applied,

7 is a block diagram showing a connection configuration for switching cells of the asynchronous transmission system switching system to which the present invention is applied;

8 is a development diagram illustrating a cell switching operation of an asynchronous transmission system switching system to which the present invention is applied.

Explanation of symbols on the main parts of the drawings

10: EMS 20: control unit

21: MSPFA 22: SCPFA

23, 32, 42: AMCFA 30, 40: matching part

31, 41: LINE I / F 50: Switch unit (TCSFA)

60: clock distribution unit (CGDFA)

The present invention relates to a cell transmission method in an asynchronous transmission method switching system. In particular, in the asynchronous transmission system switching system, the cell transmission is performed using its own software without using an external measuring instrument. The present invention relates to a cell transmission method in an asynchronous transmission switching system that is suitable for the following.

In general, Asynchronous Transfer Mode (ATM) is a broadband integrated services digital network (B-ISDN) in 1988 by the International Telecommunications Union (TTU). It is a transmission and exchange technology that is the core of B-ISDN.

Therefore, this method divides all the information into fixed length blocks called ATM cells and transmits them sequentially. The ATM cell has 53 bytes, of which the header is 5 bytes and the information field is 48 bytes. This fixed-length data string becomes a unit of multiple exchange. The header contains a Virtual Channel Identifier (VCI), a Virtual Path Identifier (VPI) to identify the connection to which the cell belongs, and a Cell Priority (Cell Loss) indicating whether the cell should be discarded during congestion. Priority (CLP), cell information identification (Payload Type, PT) to distinguish network control information, and header error control (Header Error Control (HEC)). The feature of ATM multiplexing is that the multiplexing efficiency is higher than time division by statistical multiplexing, and the transmission band allocated to individual communication can be freely set. The characteristic of ATM exchange is that since routine information is stored in a header, each ATM exchange can independently relay and exchange cells, and the exchange process can be realized by hardware (chip), thereby increasing the exchange speed. The ATM switching network consists of two levels of networks, the virtual path (VP) and the virtual channel (VC). As described above, ATM is a technology capable of processing a variety of information at high speed by inheriting high transmission efficiency of packet switching and correcting a decrease in switching delay line usage efficiency, which is a disadvantage of circuit switching.

Thus, asynchronous transmission switching system is a communication technology that is expected to become the core of the broadband integrated information network (B-ISDN) that will be introduced in the 21st century. ISDN, which is currently put into practical use, is centered on 64kbps circuit switching service and 16kbps packet switching service. Fiber optics are laid out to subscribers (for example, homes) and offer a transmission capacity of about 150 Mbps or 600 Mbps, which aims to integrate high-speed file transfers and video transfers as well as telephone and low-speed data. Based on such high-speed transmission, the asynchronous transmission method (ATM) adopts the advantages of packet switching and circuit switching technology and integrates both services. ATM divides the information to be delivered into short fixed-length ATM cells and sends them sequentially with a header at the beginning.The ATM switch uses the header to send the cells to the receiver at high speed. do. Multiplexed images on the transmission line are similar to packet-switched communication but are processed at high speed. Therefore, services realized by conventional circuit switching such as voice communication and video communication are also integrated.

1 is a block diagram of a general asynchronous transfer switching system.

Here, reference numeral 10 is an EMS (Element Management System), 20 is a control unit, 21 is a System Management & Control Front board Assembly (MSPFA), 22 is a System Signaling Control Front board Assembly (SCPA), 23 is AMCFA (ATM) Management Control Front board Assembly).

In addition, reference numerals 30 and 40 are a plurality of matching parts, 31 and 41 are line interfaces (LINE I / F) in the matching part, 50 is a switching part (Cell Switching Front board Assembly (TCSFA)), 60 Is a clock distribution front board assembly (CGDFA).

2 is a flowchart illustrating a cell transmission method using a test connection in a control unit in a conventional asynchronous transmission system switching system.

As shown in the figure, if the control unit 20 of the asynchronous transmission system switching system receives a command from the operator via the EMS (10) (ST1) (ST2) and determine whether the command; If the command is a cell transfer command, loopback is set to the destination line interface (I / F), a test connection is made to the line interface, and the count is determined up to four times (CNT = 0, CNT <4). Step ST3 to ST5; Transmitting cells if the count does not reach up to four times, and determining whether the number of transmitting cells and the number of receiving cells are the same when the count reaches four times (ST6) (ST7); Reporting a test NOK (Not Ok) when the number of transmitting cells and the number of receiving cells are not the same (ST8); If the number of transmitting cells and the number of receiving cells are the same, step ST9 of reporting a test OK is performed.

3 is a flowchart illustrating a cell transmission method using an IPC connection in a control unit in a conventional asynchronous transmission system switching system.

As shown in the figure, if the control unit 20 of the asynchronous transmission system switching system receives a command from the operator through the EMS (10) (ST11) (ST12) and determine whether the command; Determining whether the command is a valid Inter Processor Communication (IPC) connection if the command is a cell transmission command (ST13); Determining if the count is performed up to the number of inputs (CNT = 0, CNT <number of inputs), if the connection is valid IPC (ST14); If the count does not reach the input number of times, transmitting a cell; if the count reaches the input number, determining whether the number of transmitting cells and the number of receiving cells are the same (ST15); Reporting a test NOK (Not Ok) when the number of transmitting cells and the number of receiving cells are not the same (ST17); If the number of transmitting cells and the number of receiving cells are the same, step ST18 of reporting a test OK is performed.

The operation of the prior art configured as described above will be described in detail with reference to the accompanying drawings.

First, in the cell transmission method using the conventional software, the operator commands the cell transmission to the MSPFA 21 of the control unit 20 by using the EMS 10, and the MSPFA 21 sets up a test connection and sets the cell. Sending / receiving cells after sending / receiving and ping, which is console command of MSPFA (21) and AMCFA (23), to send / receive cells through IPC connection with each other and report the result to console. There are two ways and the procedure is as follows.

Referring to Figure 2 describes the cell transmission / reception operation in the control unit 20 as follows.

The operator inputs a cell transfer command to the MSPFA 21 of the control unit 20.

The MSPFA 21 then requests local loopback of the line interface card of the destination.

The AMCFA 23 then executes a local loopback of the line interface card at the destination.

The MSPFA 21 then requests a test connection to the line interface card of the destination.

The AMCFA 23 then performs a test connection setup.

The MSPFA 21 then performs cell transmission and loopback cell reception.

And report to the operator through the EMS (10).

In addition, the operation for cell transmission between the MSPFA 21 and the AMCFA 23 will be described with reference to FIG. 3.

In the console window of the MSPFA 21 or the AMCFA 23, a cell transmission command is input using a cell transmission command, ping.

Then, the number of cells inputted through the IPC connection to the MSPFA or AMCFA of the destination is transmitted.

The MSPFA or AMCFA of the destination receiving the cell retransmits the determined cell.

It then receives the cell and reports the result to the console.

However, this conventional technology has the following problems.

That is, in the case of the former as shown in FIG. 2, the cell can be transmitted / received only for the test connection, and the cell cannot be transmitted / received to the station connected to the line interface card because the local line-back card of the destination must be looped back. There was a problem that the cell transmission line is disconnected during use.

In addition, in the former case, there is a problem that the operator has to continuously give a command in order to perform continuous transmission, and there is a problem that the transmission amount and speed cannot be adjusted.

In addition, in the latter case as shown in FIG. 3, there is a problem in that a cell can be transmitted / received only by using an IPC connection and a transmission rate cannot be adjusted.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to perform cell transmission using its own software without using an external instrument in an asynchronous transmission system. The present invention provides a cell transmission method in an asynchronous transmission switching system that can simulate an asynchronous transmission connection.

In order to achieve the above object, a cell transmission method in an asynchronous transmission system switching system according to an embodiment of the present invention,

A first step of determining whether a command is a cell transmission when the command is received from an operator through an EMS in an asynchronous transmission system switching system; A second step of determining whether a connection in the asynchronous transmission mode switching system is a valid connection if the command is a cell transmission command; A third step of adjusting a cell transmission rate by calculating a cell transmission rate if the connection is a valid connection; A fourth step of determining whether there is a transmission stop command after the third step; A fifth step of transmitting a cell and then returning to the fourth step if there is no transmission stop command in the fourth step; In the fourth step, if there is a transmission stop command, the sixth step of reporting a cell transmission result is performed.

Hereinafter, an embodiment according to the present invention, a technical concept of a cell transmission method in an asynchronous transmission system switching system will be described with reference to the accompanying drawings.

4 is a flowchart illustrating a cell transmission method in an asynchronous transmission system switching system according to the present invention.

As shown therein, the first step (ST21) (ST22) for determining whether the command is a cell transmission when receiving a command from the operator through the EMS (10) in the asynchronous transmission system switching system; A second step (ST23) for determining whether the connection in the asynchronous transmission mode switching system is a valid connection if the command is a cell transmission command; A third step (ST24) of adjusting a cell transmission rate by calculating a cell transmission rate if the connection is a valid connection; A fourth step ST25 for determining whether there is a transmission stop command after the third step; A fifth step (ST26) of transmitting a cell and then returning to the fourth step if there is no transmission stop command in the fourth step; If there is a transmission stop command in the fourth step, a sixth step ST27 for reporting a cell transmission result is performed.

In the second step, it is characterized by analyzing the operator command received through the EMS (10) to analyze the type of connection, find out the connection and determine whether it is a valid connection.

In the second step, the connection type is a test connection state in which the control unit 20 and the line interfaces 31 and 41 of the matching unit 30 and 40 in the asynchronous transmission system switching system are connected. do.

In the second step, the connection type is characterized in that the connection state for the IPC in which the control unit 20 and the matching unit 30, 40 in the asynchronous transmission method switching system using the switch unit 50 is connected. .

In the second step, the connection type is a cell switching connection state connecting between line interfaces 31 and 41 in the matching unit 30 and 40 in the asynchronous transmission mode switching system.

The third step may further include, if the connection is a valid connection, calculating a reporting period so as to adjust a cell transmission amount.

In the third step, the periodic period is calculated by generating and managing a reporting task such that periodic reporting is performed when calculating the reporting period.

In the fifth step, the cell is transmitted by analyzing and managing the priority (CLP) and information fields of the cell.

In the fifth step, if there is no transmission stop command in the fourth step, the method further includes checking the receiving cell and then returning to the fourth step.

The fifth step may further include checking an error of a cell returned from a destination by the receiving cell test.

In the fifth step, if there is no transmission stop command in the fourth step, the method further includes returning the cell transmission and reception cells to the fourth step after performing a result report on the inspection.

In the sixth step, the result report is generated by managing and generating fields necessary for reporting a cell transmission result.

The operation of the cell transmission method in the asynchronous transmission system switching system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First of all, the present invention attempts to simulate all asynchronous transmission connections in operation by performing cell transmission using its own software without using an external instrument in an asynchronous transmission system switching system.

Thus, in the present invention, when receiving a command from the operator through the EMS (10) in the asynchronous transmission method switching system, the cell transmission command and when the connection is valid, calculates the transmission rate, calculates the auxiliary period and then checks the cell transmission, receiving cell check, result If a report or the like, and if there is a transmission stop command, and reports the results of cell transmission and reception.

5 is a block diagram showing a connection configuration for a test of the asynchronous transmission system switching system to which the present invention is applied, and FIG. 6 is a block diagram showing a connection configuration for IPC of the asynchronous transmission system switching system to which the present invention is applied. 7 is a block diagram showing a connection configuration for cell switching of an asynchronous transmission system switching system to which the present invention is applied.

Thus, it is composed of a control unit 20, matching unit 30, switch unit 50, clock distribution unit 60.

The control unit 20 is composed of an MSPFA 21 for managing a system, SCPFA 22 for performing call processing, and an AMCFA 23 for managing a line interface card.

In addition, the matching system 30, 40 is composed of a plurality of lines, consisting of a line interface 31 (41) card for performing a line interface and the AMCFA (32) 42 for managing the line interface 31 (41). .

In addition, there is a TCSFA in the switch unit 50 for switching cells.

In addition, the clock distribution unit 60 that distributes the clock to the control unit 20 and the matching unit 30, 40 has a CGDFA.

In addition, the connection of the asynchronous transmission system is divided into PVC (Permanent Virtual Connection) and SVC (Switched Virtual Connection). PVC connection is PtoP (Point-to-Point). And PtoMP (Point-to-MultiPoint).

In addition, the connection of the asynchronous transmission switching system may be divided into a test connection (see FIG. 5), an IPC connection (see FIG. 6), and a cell switching connection (see FIG. 7) according to its purpose.

So, basic command initiation in PtoP or PtoMP connection is done by user selecting the corresponding port and setting the desired connection in EMS (10) state.

The command started through the MSPFA 21 ends with a command to the AMCFA 23, 32, 42 having the corresponding subscriber board.

In addition, the connection-related commands issued by the EMS 10 to the MSPFA 21 can be classified into three types, namely, establishment of a new connection, deletion of a connection, and modification of a parameter for an already issued connection.

The most important part of establishing a connection here is the management of the connection tag. The connection tag is used to physically establish a connection ID (identification) between the AMCFAs 23, 32 and 42.

8 is a development diagram illustrating a cell switching operation of an asynchronous transmission system switching system to which the present invention is applied.

Thus, in the asynchronous transmission mode connection, as shown in FIG. 8, one connection may be divided into ingress and egress based on a switch.

The cell entering the TCSFA 60, which is the switch unit, through the ingress and attaches the switch number and the tag (ST31).

In addition, the cell entering the switch will transfer the cell to the AMCFA on the side of the switch number brought by the cell (ST32).

Cells entering egress through the switch are identified using only tag numbers and converted to the VPI and VCI values of the corresponding ports (ST33).

Since the connection tag is mainly used to be converted on the destination side of the connection, the value of the tag that goes out to the ingress side of the source side of the connection may overlap if only the switch number is different. It only needs to overlap tag values coming into egress on the destination side.

In addition, the tag is assigned to the source and the destination one by one for each connection, and a total of two are assigned. Each tag has a remaining tag value by different source and destination.

In the conventional technology, the cell transmission method in the control unit 20 implements the cell transmission / reception function in the management module of the control unit 20 as shown in FIG. Since the reception structure is implemented, the test connection is established from the MSPFA 21 to the line interface card as shown in ST4 of FIG. 2 (see FIG. 5), and there is a limitation in that the cell transmission is possible only for the connection.

In addition, the cell transmission scheme between the MSPFA and AMCFA in the prior art, as shown in ST13 in FIG. 3, confirms that the connection is valid for IPC (see FIG. 6), and has a limitation in that the cell transmission / reception is only possible for the IPC connection. there was.

Therefore, the present invention implements the function in the AMCFA having all the connections (see FIGS. 5 to 7) of the asynchronous transmission system switching system, as shown in ST23 of FIG. The transmission / reception of the cell becomes possible in the test connection of FIG. 5, the IPC connection of FIG. 6, and the cell switching connection of FIG.

As such, the present invention simulates all asynchronous transmission connections in operation by performing cell transmission using its own software without using an external instrument in the asynchronous transmission system.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the asynchronous transmission method switching system according to the present invention, the cell transmission method in the asynchronous transmission method switching system does not use an external measuring instrument and performs cell transmission using its own software. The effect is to simulate the connection.

In addition, the present invention can simulate the operation of all connections of the asynchronous transmission system switching system without disconnection of the cell transmission line during operation, the ability to transmit and receive cells, the function of adjusting the cell transmission rate and amount, Based on the functions that can transmit / receive cells with large stations, it is possible to test the interface card statistics, connection statistics, UPC (User Parameter Control), congestion control, etc. for the asynchronous transmission system exchange system. A (Recommended Standard-232C) connection also has the effect of enabling remote testing.

Claims (12)

A first step of determining whether a command is a cell transmission when the command is received from an operator through an EMS in an asynchronous transmission system switching system; A second step of determining whether a connection in the asynchronous transmission mode switching system is a valid connection if the command is a cell transmission command; A third step of adjusting a cell transmission rate by calculating a cell transmission rate if the connection is a valid connection; A fourth step of determining whether there is a transmission stop command after the third step; A fifth step of transmitting a cell and then returning to the fourth step if there is no transmission stop command in the fourth step; And a sixth step of reporting a cell transmission result, if there is a transmission stop command in the fourth step. The method of claim 1, wherein the second step, And analyzing a type of connection by analyzing an operator command received through the EMS, and finding a corresponding connection to determine whether the connection is a valid connection. The method of claim 2, wherein the connection type in the second step, And a test connection state in which the control unit and the line interface of the matching unit are connected to each other in the asynchronous transmission system switching system. The method of claim 2, wherein the connection type in the second step, And a connection state for the IPC in which the control unit and the matching unit in the asynchronous transmission method switching system are connected using a switch unit. The method of claim 2, wherein the connection type in the second step, And a cell switching connection state connected between line interfaces in a matching unit in the asynchronous transmission system switching system. The method of claim 1, wherein the third step, And if the connection is a valid connection, calculating the reporting period so as to adjust a cell transmission amount. The method of claim 6, wherein the third step, A method of cell transmission in an asynchronous transmission switching system, characterized in that the calculation of the periodic period by generating and managing a reporting task so that periodic reporting is performed when calculating the reporting period. 8. The method of claim 1, wherein the fifth step comprises: A method for cell transmission in an asynchronous transmission switching system, characterized in that for transmitting a cell by analyzing and managing the priority and information fields of the cell. 8. The method of claim 1, wherein the fifth step comprises: And if there is no transmission stop command in the fourth step, checking the receiving cell and then returning to the fourth step. The method of claim 9, wherein the fifth step, And checking the error of the cell returned from the destination by the receiving cell check. 8. The method of claim 1, wherein the fifth step comprises: In the fourth step, if there is no transmission stop command, the method further comprises returning the cell transmission and reception cell to the fourth step after performing a result report on the inspection. Cell transfer method. The method according to any one of claims 1 to 7, wherein the sixth step is A method for cell transmission in an asynchronous transmission switching system, comprising generating and managing fields necessary for reporting a cell transmission result and performing a result report.

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