KR970002789B1 - Method and apparatus for testing type / data transmission function of broadband communication terminal card - Google Patents

Abstract

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Description

Type 1 data transmission function test method and apparatus for broadband communication terminal card

1 is a block diagram showing the hierarchical processing of data applied to the present invention.

2 is an apparatus block diagram for testing a data transmission function of a broadband communication terminal card according to the present invention.

3 is a control flowchart of a type 1 data transmission function test according to the present invention.

4 is a cell structure diagram of type 1 data applied to the present invention.

* Explanation of symbols for the main parts of the drawings

5: first memory 100: broadband communication terminal card

200: transmission function inspection unit 210: second memory

220: Romans 230: Ram

300: display unit.

The present invention relates to the field of data transmission in an asynchronous transfer mode (hereinafter referred to as `` ATM '') suitable for implementing a broadband integrated serviced digital network (BISDN), in particular an ATM method. An improved method and apparatus for testing a Type 1 data transmission function of a broadband communication terminal card located within a subscriber terminal of a system.

In general, broadband integrated telecommunication networks can be further developed from the well-known concept of integrated telecommunication networks (ISDN), and can provide various broadband services by using high-speed transmission, switching, signal processing, computer, software, and device technologies. It is the next generation network of international standard which means next generation digital network. This broadband integrated telecommunication network combines communication and distribution services, and satisfies both narrowband and broadband services simultaneously by providing circuit mode and packet mode services in common.

The ATM method suitable for the implementation of such broadband comprehensive information communication is a standard for a packet exchange technology using a fixed length packet, and is suitable for processing a variety of high-speed information by simple packet processing. In other words, this method has the advantages of circuit switched and packet switched over synchronous transmission that transmits subscriber's information using a channel with fixed bandwidth. It became.

Compared to the synchronous transmission method, the ATM method has similarities in terms of transmitting information in a digital format and supporting multiple channels in a transmission flow. However, an important difference is the way in which information channels are allocated and recognized. That is, in the synchronous transmission method, information to be transmitted is allocated through a fixed channel, and recognition thereof is performed according to a relative position of a frame pattern. Therefore, this method is inefficient in terms of bandwidth consumption because channels of the band are continuously allocated even when there is no information to transmit. Meanwhile, in the ATM scheme, a channel is allocated only when information to be transmitted is generated. Therefore, an unallocated channel can be used to transmit information of another subscriber, thereby achieving efficient channel management. In addition, the information channel recognition of the ATM scheme is implemented by a virtual path and a virtual channel identifier (hereinafter referred to as `` VPl & VCI '') located in the header of each cell. The recommended cell format for the I series of the International Telegraph and Telephone Advisory Committee (`` CCITT '') has a 53-byte structure that includes a 5-byte header and 48 bytes of information. The channel recognition of the ATM method facilitates multiplexing, demultiplexing, and exchange of digital information, thereby lowering the cost of broadband network elements, and having flexibility in bandwidth distribution.

On the other hand, a communication system or switch using the ATM method as described above is connected to a plurality of subscriber stations to communicate the corresponding information and provide various services. Here, communication of such information and provision of service are possible because the terminal of each subscriber has a broadband communication terminal card having a plurality of processing modules as shown in FIG.

Referring to FIG. 1, in order for a terminal card in a subscriber station to transmit and receive text data between subscribers in a broadband integrated information communication network, an ATM layer processing module 10, an ATM layer processing module 20, and physical It can be seen that the hierarchical processing module 30. Therefore, in the case of transmission, the data is read from the memory in which the subscriber's transmission data is stored and then sent to the counterpart terminal through the ALL layer processing module 10, the ATM layer processing module 20, and the physical layer processing module 30. The reverse, in the case of reception and in the case of reception. At this time, the target data mainly processed for transmission and reception are text data, and are classified into type 1, type 3/4, and type 5 according to the cell structure of the data. Here, the part to be solved in the present invention is the normal presence test for the transmission function of the terminal card.

As described above, it can be seen that the broadband communication terminal card is a very important device for processing the text data of subscribers in several layers to achieve broadband communication. In the related art, only a method of transmitting an ATM exchange has been conceptually disclosed. There is no known technique for separately testing the transmitting function of a subscriber's terminal card. In any case, checking the transmission function at the time of manufacture of the broadband communication terminal card in large quantities will provide a great advantage in the smooth performance of the broadband communication. There must be a test apparatus and method for functioning.

Accordingly, an object of the present invention is to provide a method for testing the data transmission function of a broadband communication terminal card.

Another object of the present invention is to provide an apparatus capable of simply checking whether there is an abnormality in a transmission function of a communication terminal card that transmits type 1 information by an ATM method.

It is still another object of the present invention to provide a method and apparatus capable of checking a transmission operation of a subscriber device transmitting 47 bytes of data as 53 bytes of data under an asynchronous delivery mode.

According to the method of the present invention for achieving the above objects, receiving the upper layer subscriber data stored in the first memory, processing the upper layer subscriber data in an asynchronous delivery mode adaptive layer, and the asynchronous delivery mode Processing the data processed by the adaptive layer into an asynchronous transfer mode layer, storing the data in a second memory, storing transmission data provided from a communication terminal card in a volatile memory, data stored in the second memory, and Reading the transmission data stored in the volatile memory, comparing the read data with a predetermined bit unit, and if the read data do not coincide with each other in the comparing step, error position information and error indication data are read. Outputting for display. Therefore, when the terminal card has an error in the transmission function, the user or the inspector can easily recognize the location information and the error indication data of the error.

In addition, the apparatus for testing a data transmission function of a broadband communication terminal card according to the present invention is connected to the card, and includes a first memory for storing upper layer subscriber data, and for processing the subscriber data in an asynchronous delivery mode adaptation layer. Means, means for processing data processed in the asynchronous delivery mode adaptation layer into an asynchronous delivery mode layer, means for storing data processed in the asynchronous delivery mode layer in a second memory, and from the broadband communication terminal card Means for storing the provided transmission data in an internal volatile memory, means for reading the data stored in the second memory and the transmission data stored in the volatile memory and comparing each other in predetermined bit units with each other; The location of the error if the read data do not match each other by comparison Transmission function checking means having means for outputting to display the error and error indication data, said second memory for storing data processed in said asynchronous transfer mode adaptation layer connected to said transmission function checking means, and said transmission. And a display means connected to the function checking means for receiving the position information and the error indication data of the error and displaying them externally.

According to the method and apparatus of the present invention as described above, when the broadband communication terminal card normally performs a transmission function as described in FIG. 1, error location information and error indication data do not appear on the display means. On the contrary, when the card has an abnormal transmission of data, such information and data are displayed so that the user or inspector can easily recognize the state of the card by viewing the location information and error indication data of the error. Thus, the objects of the present invention described above can be sufficiently achieved.

Hereinafter, a test apparatus and a method thereof for a broadband communication terminal card according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, detailed items on the type of such apparatus and the like are described in detail to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be sufficiently implemented by the above-described technical spirit of the present invention without these detailed items. In addition, features and functions of well-known circuit elements are not described in detail in order not to obscure the present invention, and the same terminology is used in English initials or Korean language for convenience of explanation and understanding.

First, in order to be able to know whether the broadband terminal card subjected to the transmission function test for the text processing data in the present invention performs the above-described hierarchical processing without error, a second diagram is shown. That is, referring to FIG. 2, which is an apparatus block diagram for testing the data transmission function of the broadband communication terminal card according to the present invention, the broadband communication terminal card 100 receives 47 bytes of subscriber data from the first memory 5; Received via the line 11, and performs the hierarchical processing as shown in FIG.

The transmission function inspection unit 200 has a non-volatile memory ROM 220 and a volatile memory RAM 230, and is connected to the line 12 and the line 13 of the first memory 5. The second memory 210 inputs and outputs 53 bytes of data under the control of the transmission function inspection unit 200 through the line 14.

The display unit 300 is connected to the inspection unit 200 through a line 15 to display a message output from the inspection unit 200.

Here, the software stored in the ROM 220 is shown as a flowchart in FIG. In addition, the RAM 230 is provided with a work area for comparing the data, and data having a cell structure as shown in FIG. 4 is stored and output.

In the following, a description of the transmission function test of the present invention will be described with reference to FIG. 3, and FIGS. 2 and 4 will be cited whenever necessary for clear understanding and explanation of the implementation of the invention.

Referring to FIG. 3, when the test function starts, the transmission function check unit 200 receives the subscriber data of 47 bytes from the first memory 5 in step 302. Herein, the 47-byte data corresponds to an information area in the cell structure of FIG. 4 and is SAR-PDU (Segmentation And Ressembly-Protocol Data Unit) payload data. That is, the subscriber data stored in the first memory 5 in step 302 is data corresponding to a higher layer in the protocol reference model (PRM) in the broadband integrated information communication network. By performing operation 303, the inspection unit 200 processes the 47-byte subscriber data into an asynchronous delivery mode adaptation layer lower than the upper layer to generate 48-byte data.

Referring to FIG. 4, a 48-byte SAR-PDU is generated by performing step 303, which is performed by adding 1 byte of the SAR-PDU header to 47 bytes of the SAR-PDU payload, which is the subscriber data. It is obtained by. Here, the 1-byte SAR-PDU header is composed of 1 bit SN and 1 bit SNP as shown in FIG. In addition, the 4-bit SN is composed of CSI 1 bit and SC 3 bits, and the SNP is composed of CRC 3 bits and EP 1 bit. Among the English abbreviations used, SN is Sequence Number, SNP is Sequence Number Protection, CSI is Convergence Sublayer Indication, and SC is Sequence Count. In addition, CRC is Cyclic Redundancy Check and EP is Even Parity.

In step 303, the 48-byte data generated as described above is processed into an asynchronous delivery mode layer to generate 53-byte data. That is, 53 bytes of data are generated by adding 4 bytes of ATM cell header and 1 byte of header error control (HEC) to the 48 data. Here, the header of 5 bytes will be described with reference to FIG. As recommended in I.361 of CCITT, the header is used to identify cells belonging to the same virtual channel among ATM cells present in the flow of data information. As shown in FIG. 4, the header includes Generic Flow Control (GFC), Virtual Path Idicatifier (VPI), Virtual Channel Identifier (VCI), and Payload Type (VCI). PT: Payload Type), Cell Loss Priority (CLP), and Header Error Control (HEC). Within the header, GFC is allocated 4 bits for pure flow control of the signal. In addition, the VPI provides a path recognition method for finding a group of virtual channels transmitted through the same physical medium and is allocated 8 bits. The VCl provides a method for recognizing a virtual channel and is allocated 16 bits. The PT indicates the type of payload and is used to indicate whether the cell includes user information or network information, and 3 bits are allocated. The CLP is used to indicate priority for loss of a cell and is allocated about 1 bit. The HEC is used to control the error of the header, and one byte is allocated to correct an error for the entire cell information by a predetermined method.

Therefore, the inspection unit 200 performs steps 302, 303, and 304 in order to generate 53 bytes of data, and stores the same in the second memory 210 through the line 14 of FIG. 2 in step 305. do. In addition, in operation 306, the inspection unit 200 stores 53 bytes of data transmitted from the broadband communication terminal card 100 through the line 13 of FIG. 2 in the RAM 230, which is a volatile memory. Here, the reason why the broadband communication terminal card 100 can output 53 bytes of transmission is because the same processing as that of steps 302, 303, and 304 in FIG. 3 is performed through an internal transmission function module. However, in the present invention, since the card 100 is for testing whether or not the card 100 outputs an error of 53 bytes or normal 53 bytes or not 53 bytes, the card 100 need not be limited to 53 bytes.

In operation 307, the data stored in the second memory 2010 and the transmitted 53-byte data stored in the RAM 230 are read by the inspection unit 200. The read data are compared with each other in predetermined bit units in step 308. Here, the predetermined bit unit is one bit or one byte unit. In step 309, the inspection unit 200 determines whether two data match each other, and if it does not match, proceeds to step 310, and if it matches, returns to step 308 and compares the next data. Operation 310 refers to the step of outputting the position information of the error and the error indication data to be displayed on the display 300. In step 311, it is checked whether the comparison of all read data is complete, and if not, step 308 is performed. Therefore, the user or the inspector can easily identify the presence or absence of a transmission function error of the broadband communication terminal card through the display unit 300 of FIG.

As described above, according to the present invention, since the type 1 data transmission function of the broadband communication terminal card can be easily tested, the convenience and operation convenience of the test can be expected. It can be effective.

In the above description, the present invention has been described and limited by way of example with reference to the drawings, but it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit of the present invention. . For example, even if it is not 53 bytes of data, it can be tested by modifying the program, and an error may be indicated by an alarm.

Claims (6)

CLAIMS 1. A method for testing a data transmission function of a broadband communication terminal card, the method comprising: receiving upper layer subscriber data stored in a first memory; Processing the upper layer subscriber data into an asynchronous delivery mode adaptation layer; Processing the data processed by the asynchronous delivery mode adaptation layer into an asynchronous delivery mode layer and storing the data in a second memory; Storing transmission data provided from the broadband communication terminal card in a volatile memory; Reading the data stored in the second memory and the transmission data stored in the volatile memory, comparing the read data with a predetermined bit unit, and if the read data do not coincide with each other in the comparing step, And outputting the error location information and the error indication data to display the error information. The method of claim 1, wherein the subscriber data corresponds to type 1. The method of claim 1, wherein the predetermined bit unit is one bit or eight bits. An apparatus for testing a data transmission function of a broadband communication terminal card, comprising: a first memory connected with the card and configured to store higher layer subscriber data; Means for processing said subscriber data in an asynchronous delivery mode adaptation layer, means for processing data processed in said asynchronous delivery mode adaptation layer in an asynchronous delivery mode layer, and data processed in said asynchronous delivery mode layer in a second manner; Means for storing in the memory, means for storing the transmission data provided from the broadband communication terminal card in an internal volatile memory, data stored in the second memory and transmission data stored in the volatile memory, and being read. Transmission function checking means having means for comparing each other bit by bit and means for outputting to display position information and error indication data of an error when the read data does not coincide with each other by comparison of the comparing means; The second memory coupled to the transmission function checking means to store data processed by the asynchronous transfer mode adaptation layer; And at least display means connected to said transmission function checking means for receiving said position information and error indication data of said error and displaying them externally. The apparatus of claim 4, wherein the volatile memory is a RAM memory. 5. The apparatus of claim 4, wherein the predetermined bit unit is one bit or eight bits.