JPH09200335A - Digital continuity testing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the number of lines to be simultaneously tested without increasing the cost of test equipment and to effectively utilize time slot resources. SOLUTION: A testing device 6 is connected through a time dividing highway for transmitting/receiving a digital pattern for test to a line concentrating/ distributing switch (LCSW) 5. In a transmission mode, a fixed multiframe pattern for test is sent from the testing device 6 corresponding to the instruction of a test controller 6. The LCSW 5 distributes the fixed multiframe pattern for test to respective lines to be tested. Corresponding to the instruction of the test controller 6, returning at an office line terminal terminating device (OCU) 4 and acustomer station line terminating device (DSU) 2 is controlled. In a reception part mode, the highway multiplexing of returned pattern for test is performed for each line group by the LCSW 5, further, a multiframe bit is added to a prescribed time slot, and the pattern is made into multiframe and sent out to the testing device 6. The multiframe pattern is demultiplexed into data for each line by the testing device 6, the data demultiplexed for each line are checked as the tested result, and the discriminated result is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suitable digital continuity test system, and more particularly, to a switching station side used for maintenance and operation of a switching system, which is carried out when the switching system is built, when a line is added, and when a periodic test is conducted. The present invention relates to a digital continuity test method for performing a digital continuity test between an intra-office line terminating device (hereinafter, referred to as OCU for a part thereof) and a home line terminating device (hereinafter, referred to as DSU for a part of parts).

[0002]

2. Description of the Related Art A digital continuity test system of this kind is disclosed in, for example, Japanese Patent Laid-Open No. 5-268297. The digital continuity test method disclosed in this publication is
When there is a test instruction from the test terminal, the line under test is pulled into the test device by the control of the control device, the loop of the line termination device is set, the test pattern is sent from the test device, and the folded data is checked. Is to do.

[0003]

SUMMARY OF THE INVENTION Including the above example,
In the JURAI digital continuity test method, the test pattern transmitting section and the receiving section of the test equipment and the test line of the highway time slot resource have a one-to-one correspondence with each other, and a test line that can be tested at one time The reality is that the number is several lines. Therefore, for example, when a test for thousands of lines is performed, there is a problem that it takes a lot of time.

Further, as a measure against the above-mentioned problem, when the number of equipments on the test equipment side is increased and dealt with, the equipment on the test side per test line and the time slot resource between the concentrator / distribution switch are integrated. Therefore, there is a problem in that the cost of the test equipment and the time slot resource between the test equipment and the concentrator / distribution switch are consumed in proportion to the number of facilities.

An object of the present invention is to provide a digital continuity test system capable of increasing the number of lines that can be tested at one time and effectively utilizing time slot resources without increasing the cost of test equipment.

[0006]

According to the present invention, a line between a concentrating / distribution switch and an intra-station line terminating device included in a switching system, and a line between a concentrating / distribution switch and a home line terminating device. In the digital continuity test method for performing the digital continuity test, the concentrator / distribution switch is connected to the test device via a time division highway for transmitting / receiving the test digital pattern, and in the transmission mode, the test device is instructed by the instruction of the test control device. Sends the fixed multi-frame pattern for test from the line, distributes the fixed multi-frame pattern for test to each line under test by the concentrator / distribution switch, and returns it at the intra-site line terminating device and the home line terminating device according to the instruction from the test controller. In control mode, in the receiver mode, the folded test pattern is concentrated / concentrated.
Highway multiplexing is performed for each line group by a distribution switch, multi-frame bits are added to predetermined time slots, multi-frames are created and sent to the test equipment, and the multi-frame pattern is sent to the test equipment by the test equipment. A digital continuity test method is obtained in which the data separated for each line is checked as a test result and the determination result is output.

The test fixed multi-frame pattern in the transmission mode may have a test pattern in a predetermined time slot.

A maintenance center terminal may be connected to the test control device via a data transfer network so that a continuity test instruction and a test result are transmitted and received through the data transfer network.

Further, the test apparatus is provided with a memory capable of shifting and writing each of the data as the test result separated for each of the lines so as to leave a history of a predetermined plurality of times, and to the memory. The continuity test result may be determined depending on whether or not the written test result data corresponds to the test fixed multi-frame pattern.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital continuity test system according to the present invention will be described below with reference to the drawings.

In the present invention, a multi-frame structure is constructed in the time division highway for transmitting / receiving the test digital pattern.

FIG. 1 is a block diagram showing the configuration of a digital continuity test system (system) according to an embodiment of the present invention. In FIG. 1, the subscriber terminal 1 has a DSU 2 (DS
U # 0 to DSU # 119), and DSU2
Through the subscriber line 3 to the OCU 4 (OCU # 0 to OCU #
119). In addition, OCU4 is
It is housed in the distribution switch 5 (LCSW5). Here, between DSU2-LCSW5 and OCU4-LCS
The line between W5 is the system subject to the digital continuity test. Further, a test device 6 is connected to the LCSW 5,
The test device 6 is controlled by the control device 7. The control device 7
It is connected to the maintenance center terminal 9 via the data transfer network 8. The test apparatus 6 includes a pattern generator and a reception pattern check memory, as will be described later.

FIG. 2A is a diagram showing a transmission image from the test apparatus 6 in the transmission mode described later.
(B) is a diagram showing a reception pattern at a reference point.
FIG. 3A is a diagram showing a reception image to the test apparatus 6 in the reception mode described later, and FIG. 3B is a diagram showing a reception pattern at the reference point. FIG. 4 is a diagram showing the contents of a reception pattern check memory, which will be described later, of the test apparatus 6.

Next, the operation of the present digital continuity test system will be described with reference to FIGS. When carrying out the digital continuity test, first, a test instruction is transmitted from the maintenance center terminal 9 to the control device 7 via the data transfer network 8. When the control device 7 receives the test instruction from the maintenance center terminal 9, the control device 7 controls the LCSW 5 to pull in the line under test and connects it to the test device 6. In addition, depending on the control information embedded in the time slot, OCU4 or DS
Set U2 turn back.

In the transmission mode, the test apparatus 6 operates as shown in FIG.
The test fixed multi-frame pattern shown in FIG. In the present embodiment, in the test fixed multi-frame pattern, the time slot TS1 shows the test pattern, and the time slot TS1 is “FF”. 8
Frame and time slot TS1 is "00" 8
It is data in which frames and frames are alternately repeated. LCSW5
Distributes the test pattern of the time slot TS1 to each line under test for the fixed multi-frame pattern for test from the test apparatus 6 (the same data is distributed to each line). The test pattern is OCU4 or D
It is returned at the return point of SU2.

In the reception mode, as shown in FIG. 3A, the LCSW 5 first performs highway multiplexing for each line group consisting of 15 lines (lines # 0 to # 14, lines # 15 to # 29, etc.). Further, as shown in FIG. 3B, the multiframe numbers “01” to “0” are assigned to the time slot TS0.
8'is added, 8 multiframes are formed, and the multiframe data is sent to the test apparatus 6. In the test apparatus 6, after receiving the multi-frame data shown in FIG.
The time slot TS is separated by the separation unit (FIG. 3A).
Based on the multi-frame numbers '01' to '08' of 0, it is first separated for each line group described above, and then is separated into received data of each line by the time slot numbers (1-15). Then, the separated reception data is shifted and written in the reception pattern check memory shown in FIG. 4 provided in the test apparatus 6 so as to leave a history of the past four times. The test apparatus 6 sets the data of the past four times to “FF, 0” each time when writing to the reception pattern check memory.
The continuity test result is determined by checking whether it is 0, FF, 00 'or '00, FF, 00, FF'.

The determination result of the test device 6 is read by the control device 7 and returned to the maintenance center terminal 9 via the data communication network 8. Then, if there is a poor continuity, a predetermined measure is taken.

[0018]

According to the digital continuity test method of the present invention, the concentrator / distribution switch is connected to the test device via the time division highway for transmitting / receiving the test digital pattern, and in the transmission mode, it is instructed by the test control device. Send the fixed multi-frame pattern for test from the test equipment,
The test fixed multi-frame pattern is distributed to each line under test by the concentrator / distributor switch, and the loopback at the intra-site line terminating device and the home line terminating device is controlled by the instruction of the test control device. The test pattern is highway-multiplexed for each line group by the concentrator / distributor switch. Furthermore, multiframe bits are added to predetermined time slots, multiframe conversion is performed, and the test pattern is sent to the test device. Is separated into data for each line,
Since the data separated for each line is checked as a test result and the determination result is output, the number of lines that can be tested can be increased by one test instruction without increasing the number of equipment on the test device side. In addition, by constructing the multi-frame structure, it is possible to efficiently use the time slot resource between the test apparatus and the concentrator / distribution switch without consuming a great amount.

[Brief description of drawings]

FIG. 1 is a block diagram showing a digital continuity test method according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the digital continuity test method shown in FIG. 1, (a) is a diagram showing a transmission image from the test apparatus in the transmission mode, and (b) is a diagram at a reference point. It is a figure which shows a reception pattern.

3A and 3B are diagrams for explaining the operation of the digital continuity test method shown in FIG. 1, in which FIG. 3A is a diagram showing a reception image to a test apparatus in a reception mode, and FIG. It is a figure which shows a reception pattern.

FIG. 4 is a diagram showing the contents of a reception pattern check memory of the test apparatus in the digital continuity test system shown in FIG.

[Explanation of symbols]

 1 subscriber terminal 2 home line terminating device (DSU) 3 subscriber line 4 intra-station line terminating device (OCU) 5 assembly line / distribution switch (LCSW) 6 test device 7 control device 8 data transfer network 9 maintenance center terminal

Claims (4)

[Claims] 1. A line between a concentrator / distribution switch included in an exchange system and an intra-station line terminating device, and a concentrator / distributor.
In a digital continuity test method for performing a digital continuity test on a line between a distribution switch and a home line terminating device, the concentrator / distribution switch is connected to a test device via a time division highway for transmitting and receiving a test digital pattern, In the transmission mode, the test equipment sends out the test fixed multi-frame pattern according to the instruction of the test controller, and the concentrator / distribution switch distributes the test fixed multi-frame pattern to each measured line. Controls loopback at the line terminator and in-home line terminator. In the receiver mode, the folded test pattern is highway-multiplexed for each line group by the concentrator / distributor switch. Bits are added, and multi-frame processing is performed to test equipment. A digital continuity test method characterized in that the multi-frame pattern is separated into data for each line by a test device, and the data separated for each line is checked as a test result and a judgment result is output. . 2. The digital continuity test method according to claim 1, wherein the test fixed multi-frame pattern in the transmission mode has a test pattern in a predetermined time slot thereof. 3. A maintenance center terminal is connected to the test control device via a data transfer network, and a continuity test instruction and a test result are transmitted / received via the data transfer network. Digital continuity test method. 4. The test apparatus is provided with a memory capable of shifting and writing each of the data as the test result separated for each of the lines so as to leave a history of a predetermined plurality of times, and to the memory. 4. The digital continuity test method according to claim 1, wherein the continuity test result is determined depending on whether the written test result data corresponds to the test fixed multi-frame pattern.