JPH02271736A - Test system for subscriber line system - Google Patents

Abstract

PURPOSE:To attain the test from a customer station equipment at the time of working by providing a packet signal reflecting device, providing a telephone number and applying automatic reply to a packet exchange data call. CONSTITUTION:At first a telephone number of a packet exchange data signal loopback device 9 is sent from a customer's terminal adaptor 2 at the time of starting test and a packet call is sent. The telephone number is given on a signal line of a subscriber line 7, inputted to a digital subscriber circuit 6 and inputted to a central control unit 11 via a control bus 10. When it is cleared that the received telephone number information is the information of the device 9, the unit 11 sends a packet call incoming request to the device 9 to return the automatic reply signal. Then the circuit 6 and the device 9 are connected together to command the bus closing of a switching network 8. Then the packet switching exchange data signal sent from the subscriber's equipment is loopbacked at the work of the subscriber's equipment to recognize the performance of the subscriber line system and to conduct the test.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a subscriber line system testing method, and in particular to an IS
This article relates to a subscriber line system test method for DN exchanges.

[Conventional technology]

Conventional subscriber line system testing methods select subscriber lines from a test stand on the exchange side and measure analog parameters such as insulation resistance, capacitance, and ground-to-ground type and pressure between the subscriber lines.

These tests made it possible to detect subscriber line disconnections, ground faults, and contact with power lines.

[Problem to be solved by the invention]

The conventional subscriber line system testing method described above selects the subscriber line from a test stand on the exchange side, so there is a problem in that it is not possible to perform tests from the home equipment side during construction of the home equipment. .

Furthermore, since the test items are based on conventional analog transmission systems, there is also the problem that it is difficult to evaluate instantaneous interruptions in subscriber lines, noise intrusion, etc., which are problems especially when transmitting digital signals.

An object of the present invention is to provide a packet-switched data signal return device that has a telephone number and automatically responds to packet-switched data calls.
It is an object of the present invention to provide a subscriber line system test method that allows testing from the home equipment side during construction of the home equipment by being accommodated in an SDN exchange.

[Means to solve the problem]

The subscriber line system test method of the present invention is a subscriber line system test method for a subscriber line system in which a digital subscriber circuit of an 15DN exchange and a network termination device face each other across a subscriber line to be measured. a home terminal adapter connected to the network terminal device and capable of making a packet call; a data terminal connected to the home terminal adapter; and a data terminal connected to the home terminal adapter;
It has a packet-switched data signal return device that is housed in the SDN exchange and has a telephone number and automatically responds to packet-switched data calls, and during subscriber line testing, packet exchange is performed from the home terminal adapter to the packet-switched data signal return device. The device is configured to make a data call, and return a packet-switched data signal sent from the data terminal to the packet-switched data signal-return device to the data terminal side. .

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The data terminal 1 is connected to a network termination device 4 via a home terminal adapter 2 and a home bus 3. The network termination device 4 is
The ISDN exchange 5 protects the layer 1 termination and home equipment from external surge signals and drives the home bus 3.
The digital subscriber circuit 6 and the subscriber line 7 to be measured are sandwiched therebetween. The digital subscriber circuit 6 is connectable via a switching network 8 to a packet-switched data signal return device. Digital subscriber circuit 6
The switching network 8 and the packet switching data signal return device 9 are controlled by a central control unit 11 via a control bus 10. The control bus 10 is also used to transfer the telephone number of the called party from the digital subscriber circuit 6 to the central control unit 11, and to transfer incoming requests and response responses to the packet-switched data signal return device 9.

Next, the operation will be explained.

At the start of the test, the telephone number of the packet switching data signal return device 9 is sent from the home terminal adapter 2 to initiate a packet call. This telephone number is input to the digital subscriber circuit 6 on the signal channel of the subscriber line 7 and then via the control bus 10 to the central control unit 11 . When it is determined that the received telephone number information belongs to the packet-switched data signal return device 9, the central controller 11 sends a packet call termination request to the packet-switched data signal return device 9. When the packet-switched data signal return device 9 returns an automatic response signal, bus closure of the switching network 8 is instructed to connect the digital subscriber circuit 6 and the packet-switched data signal return device 9. All of these instruction response signals are carried out via the control bus 10. Through the above operations, the data signal sent from the data terminal 1 is converted into a packet-switched data signal and the subscriber line 7
and reaches the packet-switched data signal return device 9 via the digital subscriber circuit 6 and the switching network 8. The packet-switched data signal return device 9 returns the received packet-switched data signal as it is, and sends it back to the data terminal 1 via a route opposite to that at the time of reception. At this time, if the tester operating data terminal 1 receives the same character as that sent from data terminal 1, he or she determines that the overall function of the subscriber line system is good and receives the same character. If this fails, subscriber line 7 or digital subscriber circuit 6
I know that there is a problem.

〔Effect of the invention〕

As explained above, the present invention has the following advantages: By accommodating in an ISDN switch a packet-switched data signal return device that has a telephone number and automatically responds to packet-switched data calls,
There is an effect that the performance of the subscriber line system can be known by returning the packet-switched data signal sent from the home equipment side during construction of the home equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Data terminal, 2...Home terminal adapter, 3...Home bus, 4...Network termination device, 5...15DN Exchange machine, 6...
・Digital subscriber circuit, 7...Subscriber line, 8
. . . switching network, 9 . . . packet switching data signal return device, 10 . . . control bus, 11 . Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a subscriber line system test method for a subscriber line system in which the digital subscriber circuit of an ISDN exchange and a network terminating device face each other across the subscriber line to be measured, a packet call can be transmitted when connected to the network terminating device. an in-home terminal adapter, a data terminal connected to the in-home terminal adapter, and a packet-switched data signal return device that is housed in the ISDN exchange and has a telephone number and automatically answers packet-switched data calls, During a line test, the home terminal adapter makes a packet switching data call to the packet switching data signal return device, and after the packet switching data signal return device automatically responds, the packet switching data signal is transmitted from the data terminal. A subscriber line system testing method characterized in that a packet-switched data signal arriving at a return device is returned to the data terminal side.