JPH0759005B2 - Subscriber line automatic test system in ISDN exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to ISDN (Integrated Services Digital Network).
kv) The present invention relates to a maintenance test system for exchanges, and particularly to a subscriber line automatic test system.

[Conventional technology]

Conventionally, this type of subscriber line automatic test system has never been applied to ISDN exchanges. Therefore, regarding the operation when the conventional subscriber line automatic test system of this kind is applied to the ISDN exchange, the system shown in FIG. 2 is used to join. In FIG. 2, 1 is a subscriber terminal, 2 is a subscriber circuit, 3 is a test lead-in link, 4 is a subscriber line automatic test device, 5 is a time division switch, 6 is a central control device, and 21 is a test article. It is a contact point.

When the maintenance person inputs a subscriber line automatic test command to the exchange through an input / output terminal such as a typewriter, the exchange uses the subscriber line designated by the command for the test drop link
To the subscriber line automatic test device 4 via. Upon receiving the activation from the central control unit 6 of the exchange, the subscriber line automatic test apparatus 4 performs insulation resistance measurement, capacity measurement, etc., compares the measurement results with a preset reference value, and Report whether it is above or below the standard value.

[Problems to be solved by the invention]

As described above, in the conventional subscriber line automatic test system, when the subscriber line is physically drawn into the subscriber line automatic test device 4 through the test lead-in link 3 to perform physical measurement, If all the channels on the user interface are not empty, the test cannot be carried out, and even if it can be carried out, the digital subscriber interface device and the network terminal (not shown) are out of synchronization. There is also a drawback that the subscriber line automatic test device 4 must be set as a separate piece from the exchange main body.

[Means for solving problems]

In order to eliminate such drawbacks, the present invention provides a digital subscriber interface device which is an ISDN user network interface arranged in an ISDN exchange with a pattern generator, a pattern comparator, and a channel controller. A network terminal connected to the ISDN exchange through an ISDN line which is a subscriber line is provided with a signal extracting device and a signal inserting device.

[Action]

According to the present invention, when a test command for a subscriber line is input and a designated time based on this test command is reached, the digital subscriber interface device sends a test signal from the pattern generator through the idle channel of the designated subscriber line. At the same time as transmitting to the network terminal, the network terminal extracts this test signal by the signal extraction device, inserts the extracted test signal into the original channel by the signal insertion device and returns it to the digital subscriber interface device, and the digital subscriber interface. The pattern comparison device of the device compares the returned test signal with the test signal sent from the pattern generation device to determine the normality of the subscriber line. As a result, the subscriber line can be tested by each line test means provided in the digital subscriber interface device and the network terminal.

〔Example〕

An embodiment of a subscriber line automatic test system in an ISDN exchange according to the present invention is shown in FIG. In FIG.
7 is an ISDN terminal, 8 is a network terminal, 9 is a digital subscriber unit,
Reference numeral 10 is a digital subscriber device control device, 11 is an ISDN network user interface line, 12 is a transfer control device, and 13 is an input / output device such as a typewriter. In FIG. 1, the same or corresponding parts as those in FIG. 2 are designated by the same reference numerals.

The network terminal 8 is an ISDN-S interface (hereinafter SINTF).
81 and digital subscriber interface (hereinafter referred to as "DL
It is composed of an IC) 82, a control device (hereinafter "CTL") 83, a signal extraction device (hereinafter "DRP") 84 which is a line test means, and a signal insertion device (hereinafter "IST") 85.

The digital subscriber unit 9 includes a digital subscriber interface (hereinafter referred to as “DLIC”) 91, a D channel signal controller (hereinafter referred to as “DCH”) 92, a digital subscriber line switch (hereinafter referred to as “LSW”) 93, and an LCP. An interface (hereinafter referred to as "LCPI") 94, a control device (hereinafter referred to as "CTL") 95, a pattern generator (hereinafter referred to as "PG") 96 that is a line test means, and a pattern comparison device (hereinafter referred to as "PC") 97 Consists of.

The ISDN terminal 7 is connected to the network terminal 8 by SINTF81, and the network terminal 8 is connected to the digital subscriber unit 9 by the ISDN user network interface of CCITT-I430. The digital subscriber unit 9 is connected to the digital subscriber unit controller 10, and the digital subscriber unit controller 10 is connected to the time division switch 5.

When the maintenance person inputs a subscriber line automatic test command to the exchange from the input / output device 13 such as a typewriter, the exchange sends a line test start command to the digital subscriber unit 9 of the line designated at the time designated by the command. . The digital subscriber unit 9 which has received the line test activation command checks whether or not there is an empty channel on the ISDN user network interface. If there is no empty channel, a report indicating that all lines are being used is sent to the central control of the exchange. Perform on device 6. Empty channel is 1
If so, the control device for the digital subscriber device 9
95 notifies the network terminal 8 of the blockage of the empty channel and the start of the line test. And the digital subscriber device 9
The test pattern generated by the PG 96 is sent to the network terminal 8 via the DLIC 91.

The network terminal 8 extracts the channel under test DRP84, inserts the content of the extracted channel under test into the original channel by the IST85, that is, performs so-called folding, and returns the test pattern to the digital subscriber unit 9 again. The digital subscriber unit 9 compares the returned test pattern with the sending test pattern by the PC 97, judges the normalization of the subscriber line under test, and reports the judgment result to the central control unit 6 of the exchange, The network terminal 8 is notified of the blockage release.

The central controller 6 of the exchange outputs the test report obtained from the digital subscriber unit 9 to the input / output unit 13 and informs the maintenance person of the result.

In the present embodiment, an example of the pattern loop-back matching test is shown as an example, but a test such as an error rate measurement is also possible as a transmission quality test. Further, although the line test means has been described separately from the DLIC 82,91, it can be realized as a part of the function of the DLIC 82,91.

〔The invention's effect〕

As described above, the present invention is applicable to ISDN exchange
By providing line test means to the digital subscriber interface device of the user network interface and the network terminal,
It is possible to perform a test even if all the channels on the DN user interface are not empty, do not get out of sync during the test, and easily obtain an automatic subscriber line test system that does not require additional hardware for the test. There is an effect that can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an embodiment of a subscriber line automatic test system in an ISDN switch according to the present invention, and FIG. 2 is a system diagram showing a conventional subscriber line automatic test system. is there. 5 …… Time division switch, 6 …… Central control unit, 7 …… IS
DN terminal, 8 ... Network terminal, 9 ... Digital subscriber device, 10
...... Digital subscriber unit control unit, 11 ...... ISDN network user interface line, 12 ...... Transfer control unit, 13 ...... Input / output unit, 81 ...... SINTF, 82,91 ...... DLIC, 83,95 CTL ,
84 …… DRP, 85 …… IST, 92 …… DCH, 93 …… LSW, 94 ……
LCPI, 96 ... PG, 97 ... PC.

Claims (1)

[Claims] 1. A digital subscriber interface device, which is an ISDN user network interface and is provided in an ISDN exchange,
A pattern generation device, a pattern comparison device, and a channel control device are provided, and a signal extraction device and a signal are provided to a network terminal which is the ISDN user network interface and is connected to the ISDN exchange through an ISDN line which is a subscriber line. When the test command of the subscriber line is input and the command time based on this test command is reached, the digital subscriber interface device sends the test signal from the pattern generator through the idle channel of the specified subscriber line. At the same time as transmitting to the network terminal, the network terminal extracts the test signal by the signal extracting device, inserts the extracted test signal into the channel by the signal inserting device and returns it to the digital subscriber interface device, and the digital subscriber interface device. In the pattern comparison device of this, the returned test signal and the pattern generator For matching comparison between the test signal,
A subscriber line automatic test system in an ISDN exchange characterized by judging the normality of the subscriber line.