JP2001024667A - Line communication test control system of atm line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a line communication test control system and an ATM line terminal capable of easily segmenting the location of a line fault. SOLUTION: In this ATM line terminal 30 for terminating a line to be connected with a data physical line 20 and a repeating line 40, a function for setting loop back on a communication test line, a test pattern generating function to generate a test pattern in which a transmitted counter value is described and to transmit it on the test line, and a test pattern check function to check the test pattern received from the test line by comparing the transmitted counter value of the received test pattern with a received counter value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line communication test control system for testing line quality in an ATM line termination device accommodating a data line, and to test the line quality from a housed maintenance terminal device. The present invention relates to an ATM line termination device capable of performing the above.

[0002]

2. Description of the Related Art Conventionally, in an ATM line terminating device for accommodating a data line (particularly a device for terminating a data protocol), a bit error or the like is measured in measuring a line bit error or the like to measure the line quality. The line test was performed by connecting the tester to a terminal device connected to the line. In such a system, the occurrence of a line failure is tested from a terminal device separated from the ATM line termination device. Therefore, in the test, loopbacks must be individually generated at a test location, and the line failure portion is isolated. It takes time.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it possible to perform a line test without connecting a test device to the outside and to easily isolate a line fault site. A line communication test control method that enables a line test by remote control because there is no need to physically connect test equipment, and an ATM line termination device used in this method. The purpose is to provide.

[0004]

SUMMARY OF THE INVENTION The present invention has a function of generating a fixed pattern for communication test data in an ATM line termination device. In a test mode, a logical loop is provided from a maintenance terminal device to a predetermined location on the communication test line. Set the back, send the cell with the fixed transmission pattern and the transmission counter value to the communication test line, receive the cell returned by looping back, and detect whether or not the data matches. Perform quality tests and isolate faulty parts.

According to a first aspect of the present invention, there is provided an ATM line communication test control system comprising an ATM line termination device accommodating a data line and a maintenance terminal device accommodated in the ATM line termination device. AT
A loopback is formed at a predetermined position of the M line or the data line, and the test data transmitted from the ATM line termination device is loaded with a transmission counter value and transmitted to the line.

According to a second aspect of the present invention, in the line communication test control system of the first aspect, the ATM line termination device is provided with a function of comparing a transmission counter value mounted on test data with a reception count value.

According to a third aspect of the present invention, in the line communication test control system of the second aspect, a normal reception counter and an error counter are provided in the ATM line termination device to measure the quality of the line.

According to a fourth aspect of the present invention, there is provided a test pattern generation function for generating a test pattern in the ATM line termination device and transmitting the test pattern on the test line, and a test pattern check function for checking the test pattern received from the test line. Was.

According to a fifth aspect of the present invention, in the ATM line terminating device of the fourth aspect, there is provided a function of setting a loopback at an arbitrary position on a test line.

According to a fifth aspect of the present invention, in the ATM line terminating device of the fourth or fifth aspect, the test pattern generation function has a function of writing a transmission count value in the test pattern.

According to a sixth aspect of the present invention, in the ATM line terminating device of the fourth or fifth aspect, the test pattern check function compares the value of the reception counter with the value of the transmission counter of the received test pattern. Has functions.

According to a seventh aspect of the present invention, in the ATM line termination device of the fourth or fifth aspect, the test pattern check function has a function of detecting that the test pattern is a test pattern mounted on the test pattern.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a circuit communication test control system according to the present invention. The configuration of an ATM network accommodating a data line to which the line communication test control method of the present invention is applied will be described with reference to FIG.

An ATM network accommodating a data line includes a data terminal device 10 for data communication and a data terminal device 81 of the opposite device 80 connected to a data physical line 20.
ATM line terminating device 30, physical line 40, ATM
It is configured to be connected via a network consisting of a switch 50, a trunk 65, and a relay line 70.

The ATM line termination device 30 includes an ATM device data line accommodation package 32, an inter-package communication switch unit 31, a relay line package 33, and a bus 34.
, A main storage device 35, a central control device 36 of the ATM line termination device, and an I / O interface 37. Further, the ATM line termination device 30 has I / O
The maintenance terminal device 50 is connected via the O interface 37.

The data terminal device 10 is a device for performing data communication supporting the frame relay protocol / HDLC / BSC and the like.
It is connected to the TM device data line accommodation package 32.

The data line accommodating package 32 has a function as a CLAD device for performing termination of a data protocol procedure and cell assembly / cell disassembly processing. Further, the data line accommodating package 32 has a failure information collecting function for testing a state of data transfer between the data physical line 20 and a line network via the inter-package switch unit 31.

The path of the data physical line 20 connected to the data line accommodation package 32 is connected to the relay line package 33 via the inter-package communication switch unit 31.

The trunk line package 33 includes a physical line 40
Is connected to the data terminal device 81 via the relay network. Further, the relay line package 33 has a function of testing the state of data transfer between the physical line 40 or the inter-package switch unit 31 or the line network.

Central control unit 3 of ATM line termination unit 30
6 is connected to a main storage device 35, an I / O interface 37, and an inter-package communication switch unit 31 via a bus 34.

The maintenance terminal device 50 communicates with the ATM line termination device 30 via the I / O interface 37 to download the configuration information of the ATM line termination device, check the state of the ATM line termination device, check the state of the ATM line termination device,
It collects line fault information and starts commands such as issuing commands to ATM line terminators.

The configuration of the data line package and the operation in the test mode will be described with reference to FIG. 2 showing the block configuration of the data line accommodation package 32. The data line accommodation package 32 is configured as a CLAD device having a data receiving function 321, a microprocessor 322, a cell assembling function 323, a cell disassembling function 324, and a data sending function 325. Further, the data line accommodating package 32 has a function of generating a test pattern, which is test data, on the communication test line and a function of detecting a line communication state using the received test pattern when executing the line communication test. Have.

The data receiving function 321 receives data from the data terminal device 10 via the data physical line 20 and outputs the data to the microprocessor 322.

The microprocessor 322 has a function of terminating the procedure of data received from the data physical line 20. Further, the microprocessor 322 has a function of converting data received from the cell disassembly function 324 into a data procedure format.

The microprocessor 322 terminates the procedure of the data received from the data physical line 20 and outputs it to the cell assembling function 323. The microprocessor 32
2 converts the format of the cell received from the physical line 40 into a data procedure and outputs it to the data transmission function 325.

Further, in the test mode, the microprocessor 322 has a function of generating a test pattern TP and transmitting it to the data physical line 20 or the inter-package switch unit 31, a transmission count function of counting the transmitted test pattern TP, Test pattern TP received from data physical line 20 or inter-package switch unit 31
And a test pattern check function for checking whether the received count value matches the transmitted count value.

In the normal communication mode, the data line accommodation package 32 notifies the microprocessor 322 of data received from the data terminal device 10 via the data physical line 20 to the microprocessor 322 via the data reception function 321.

The microprocessor 322 controls the data procedure of the received data (frame relay, HDLC, BSC
), And assembles the received data into cells via the cell assembling function 323 and transmits the cells to the inter-package switch unit 31.

Contrary to the above, the data transmitted to the data terminal device 10 is disassembled from the inter-package switch unit 31 via the cell disassembly function 324 and notified to the microprocessor 322, and after being converted into the data procedure format, The data terminal device 10 via the data transmission function 325
Sent to

Referring to FIG. 3, a description will be given of a mode of setting a loop in the line communication test control system of the ATM line terminal according to the present invention. FIG. 3 shows a simplified version of the system shown in FIG. The loop indicated by the broken line is a physical loop set using the connector. On the other hand, a loop indicated by a solid line is a logical loop that is logically set in the device from the maintenance terminal device 50.

The inter-package switch unit 31, the data line accommodation package 32, and the trunk line package 33 of the transmission-side ATM line termination device, the inter-package switch unit 821 and the data line package 8 of the reception-side ATM line termination device
A logical loop is set in the receiving side of the relay line package 823 in accordance with a command from the maintenance terminal device 50. A physical loop is set on the side of the trunk line 40 of the trunk line packages 33 and 823 and on the side of the data terminal device 81 of the trunk line package 823 by connecting a loop connector in a test.

Prior to the description of the test mode for collecting fault information, the configuration of the test pattern TP will be described with reference to FIG.
2 will be described as an example. The ATM protocol is used between the data line accommodation package 32 and the line network side, and a fixed test pattern and a transmission counter value are mounted.

In the data format in the case of the frame relay protocol, the upper 2 bytes are composed of header fields such as addresses (address = 6 / CR = 1 / EA = 1 / address = 4 / FECN = 1 / BECN = 1 / DE = 1). / EA
= 1), the lower two bytes are defined as a frame check sequence (FCS) field. Further, a variable length user information field is defined between the header field and the FCS field.

The test pattern TP is stored in the user information field as test data, for example, 00H + 11H
+ 22H... + EEH + FFH and a fixed test pattern composed of a transmission counter value.
The transmission counter value is composed of a series of numbers indicating the transmission order of the transmitted frame.

In the test mode for collecting fault information of the network shown in FIG. 2, in the transmission test mode for collecting fault information at the time of data transmission to the network, the microprocessor 322 has a test pattern generation function. The test pattern TP generated by using the cell assembling function 32
At 3, the cell is assembled and transmitted to the inter-package switch unit 31. In this case, the data received from the data terminal device 10 is ignored and is not transmitted to the line network. The transmission counter value in the user information field of the test pattern TP to be transmitted includes a value that is sequentially counted up for each test pattern TP to be transmitted.

The cell on which the test pattern TP returned via the loop provided in the inter-package switch unit 31 is mounted is disassembled by the cell disassembly function 324, and the fixed pattern and the transmission counter value are extracted and received. It checks the fixed test pattern, checks whether the received transmission counter value matches the value of the transmission counter, and notifies the ATM line termination device controlware of the result as needed.
In this case, the received cells received from the network side are ignored,
It is not output from the data transmission function 325 as transmission data.

On the other hand, in the test mode for collecting the fault information of the network shown in FIG. 2, in the reception test mode for collecting the fault information at the time of receiving data from the data physical line side, the microprocessor 322 includes the test pattern. The test pattern TP generated by the generation function is forcibly transmitted to the data physical line 20 via the data transmission function 325 as transmission data. In this case, the received data received from the inter-package switch unit 31 via the cell disassembly function 324 is ignored and is not transmitted to the data physical line 20 side.

The test pattern TP returned by the physical loop provided on the data physical line 20 is checked by the test pattern check function to check the received fixed test pattern and to match the received transmission counter value with the transmission counter value. Is checked, and the result is notified to the ATM line termination equipment controlware as needed. In this case, the data received from the data physical line 20 is not output to the cell assembly function 323 side.

The processing sequence after the failure information collection start command is input will be described with reference to FIG. First,
The maintenance staff instructs the loopback setting target device from the maintenance terminal device 50 to set the loop. For locations where a logical loop can be set, the maintenance terminal 5
A loop is logically set by an instruction from 0. At locations where a logical loop cannot be set, a physical loop is set manually or by an opportunity according to instructions.

When the loop is set at the target location, the maintenance person issues a test start command from the maintenance terminal device 50 to the ATM line termination device control ware (hereinafter referred to as main C / W).

The test start command notified from the maintenance terminal device 50 to the main C / W is notified as a test start request to the data package microcontrolware (hereinafter referred to as “micro C / W”) after checking in the main C / W. .

The micro C / W starts the test when notified of the start of the test, and updates the test result as needed from the main C / W.
Notify W.

The maintenance staff issues a test result display command to the main C
/ W. The test result is notified from the main C / W to the maintenance terminal device 50 and displayed on the output means of the maintenance terminal device 50.

When the predetermined test is completed, the maintenance person notifies the maintenance terminal 50 of a test end command to the surface C / W.

The test end command notified from the maintenance terminal device 50 to the main C / W is checked by the main C / W and then notified to the micro C / W as a test end request. The micro C / W executes a process for stopping the test.

When the test termination processing is completed, a loop release instruction is notified from the maintenance terminal device 50, the loop is released, and the test is terminated.

The contents of results obtained from the micro C / W include “test start date and time”, “test time”, “number of transmitted data”, “number of received data”, “number of normal received data”, “number of abnormal data received”. And so on.

In the test mode, the package micro C /
The transmission control of the W test pattern will be described with reference to the flowchart of FIG. When receiving a test start request from the upper main C / W, the package micro C / W initializes an internal counter (S1).

Next, a test pattern TP carrying fixed test pattern data and a transmission counter value describing the count value (clear value in this case) of the internal counter is transmitted (S2).

Next, the transmission counter value of the internal counter is updated (S3). Thereafter, the process returns to step S2, and repeats control of test data transmission, updating of the internal counter value, and updating of the transmission counter value.

In the test mode, the package micro C /
The reception control of the test pattern of W will be described with reference to the flowchart of FIG. When the test is started, it is checked whether the received data is test fixed test pattern data by referring to the test fixed test pattern data of the received data (S21).

If the received data is other than the fixed test pattern, the value of the error counter provided in the pattern check function is updated (S26).

When the received data is a fixed test pattern, it is checked whether or not the transmission counter value described in the received data matches the value of the reception counter provided in the pattern check function (S22).

When the transmission counter value is normal, the value of the reception counter provided in the pattern check function is updated (S23), and the value of the normal reception counter provided in the pattern check function is updated (S23).

If the transmission counter values do not match, it is recognized that the transmission data is missing, the reception counter value provided for the pattern check function is corrected (S25), and the error count value provided for the pattern check function is updated. (S26).

After steps S24 and S26, step S2
Returning to step 1 corresponds to the reception of the next test data. The transmission counter value, reception counter value, normal reception counter value, and error counter value are notified to the upper main C / W at any time.

As described above, according to the present invention, a loopback can be freely set on a line from a maintenance terminal device accommodated in an ATM terminal line termination device during a line communication test.
Since the quality of the line can be tested, it is possible to easily identify the faulty part by sequentially changing the loopback part and performing the test.

Although the above description has been made with reference to an ATM line termination device, the present invention is not limited to the ATM line termination device but can be applied to a line termination device that supports all data communications.

[0059]

According to the present invention, it is possible to easily measure the line quality, and it is possible to easily measure not only the loop of the terminal of the opposite device of the ATM line termination device but also a plurality of loop points in the device and in the network as shown in FIG. With this, it is possible to utilize it for the separation of the outside of the field. In addition, a test can be easily performed by operating the apparatus remotely.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an ATM network to which a circuit communication test method of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a data line package.

FIG. 3 is a diagram illustrating an example of a loopback point provided in a network.

FIG. 4 is a diagram showing an example of transmission test data (test pattern) at the time of a line communication test.

FIG. 5 is a sequence diagram when a line communication test is performed.

FIG. 6 is a transmission control flowchart for a line test of the data line accommodation package microcontroller.

FIG. 7 is a reception control flowchart for a line test of the data line accommodation package microcontrolware.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Data terminal device 20 Data physical line 31 Inter-package switch part 32 Data line accommodation package 33 Relay line package 34 Bus 35 Main storage device 36 Central control device 37 I / O interface 40 Relay line 50 Maintenance terminal device 80 Opposing device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Michio Endo 94 Nippon Telecom Technology Co., Ltd. (72) Inventor: Toru Watanabe 94 Tochiba, Koriyama-shi, Fukushima Prefecture F-term in Hitachi Co., Ltd. F-term (reference) 5K019 AC09 BA51 BB32 CC14 CC15 CC16 CD08 CD11 5K030 GA12 GA14 HA10 JA08 JA10 KA16 MA03 MB20 MC02 5K035 AA07 BB01 CC06 FF04 GG06 HH03 9A001 BB04 CC06 KK56 LL05

Claims (8)

[Claims] In an ATM line communication test control system comprising an ATM line termination device accommodating a data line and a maintenance terminal device accommodated in the ATM line termination device, an ATM line is controlled by an instruction from the maintenance terminal device. Alternatively, a loopback is formed at a predetermined portion of a data line, and a test counter data transmitted from an ATM line termination device is loaded with a transmission counter value and is transmitted to the line. 2. The line communication test control method according to claim 1, wherein the ATM line termination device is provided with a function of comparing a transmission counter value mounted on test data with a reception count value. 3. The line communication test control method according to claim 2, wherein a normal reception counter and an error counter are provided in the ATM line termination device to measure the line quality. 4. An ATM line termination device having a test pattern generation function of generating a test pattern and transmitting the test pattern on a test line, and a test pattern check function of checking a test pattern received from the test line. 5. The ATM line termination device according to claim 4, further comprising a function of setting a loopback at an arbitrary position on a test line. 6. The ATM line termination device according to claim 4, wherein the test pattern generation function has a function of writing a transmission count value in the test pattern. 7. The ATM according to claim 4, wherein the test pattern check function has a function of comparing a reception counter with a transmission counter value of a received test pattern and a value of the reception counter. Line termination equipment. 8. The ATM line termination device according to claim 4, wherein the test pattern check function has a function of detecting that the test pattern is a test pattern mounted on the test pattern.