JPS63305651A - Loopback test equipment for isdn exchange - Google Patents

Abstract

PURPOSE:To attain a detailed transmission characteristic test according to the command from a terminal equipment by providing a data processing means to a B-channel interface means and processing the received data based on the information received by a D-channel interface means so as to apply loopback. CONSTITUTION:When a subscriber operates an ISDN terminal equipment 1 to select a loopback test, a loopback command and a data processing command are sent from the ISDN terminal equipment 1, a loopback command and a data processing command are sent from the ISDN terminal equipment 1. In receiving the message, a control means 11 applies the command of loopback and data processing to a data processing means 10. The data processing means 10, based on the command, starts loopback while processing the B-channel data. The ISDN terminal equipment sends the test data pattern to a channel B to collate and compare whether or not the data as the data processing command is to be returned thereby conducting the test of the normality of the transmission characteristic of the bus. On changing the processing command of the data from the ISDN terminal equipment 1, since the loopback test equipment processes the data according to the command, the detailed transmission characteristic test is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a loop back test device for testing lines of ISDN exchanges.

[Prior Art] A loop back test device has been known as a maintenance test device for ISDN exchanges, and this test device automatically answers an incoming call and performs a loop back test by simply looping back the received data. I was going.

[Problems to be solved] By the way, in ISDN exchanges, ISDN subscriber times! (
An important issue is the transmission characteristics of the U interface.

However, since conventional loop-back test equipment cannot process received data, it has had the problem of not being able to perform detailed transmission characteristic tests based on commands from the terminal side.

The present invention has been made in view of such problems, and its purpose is to provide a loop back test device for ISDN exchanges that can perform detailed transmission characteristic tests according to instructions from the terminal side. It is about providing.

[Means for Solving Problems] In order to achieve the above object, the present invention provides an ISDN user/network interface means, an LAPD interface means, a B channel interface means, and a data processing means provided in the B channel interface means. Based on the information received by the D channel interface means, the received data is processed and looped back.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an embodiment of the basic access ISDN user-network interface of the present invention.

ISDN terminal 1 connects to network terminal 3 via S interface 2.
It is connected to the. The digital subscriber circuit 5 of the ISDN exchange and the network terminal 3 are connected by a basic access U interface 4.

On the other hand, the loop back test device 7 is also connected to the digital subscriber circuit 5 of the ISDN exchange via the basic access U interface 4.

The loop back test device 7 has basic access U.
Interface means 8 and LAPD connected thereto
Interface means 9 and B channel interface means 10 having data processing means are connected,
The interface means 9 and the data processing means 10 are controlled by a control means 11.

When a subscriber makes a call from the ISDN terminal 1 and dials the telephone number of the loop back test device 7, the telephone number of the loop back test device 7 is displayed as a setup message of the D channel protocol rake 3 of the ISDN network user interface. and transmitted to the ISDN exchange.

When the ISDN exchange sends a set-up message to the loop-back test device 7, the test device 7 transmits the connect message to the interface means 9 via the interface means 8. .8.

The ISDN exchange sends a connect message to the ISDN terminal, creates a path in the network, and connects the ISDN terminal 1.
The path from to the loop back test device 7 is completed.

When the subscriber operates the ISDN terminal 1 and selects a loop back test, a loop back command and a data processing instruction are sent from the ISDN terminal 1 in the user information element of the user information message. Ru. When the loop back test device 7 receives this user information message through the interface means 9 via the interface means 8, the loop back test device 7 receives the user information message from the control means 1 of the loop back test device 7.
1 instructs the data processing means 10 to loop back and process data. Based on this instruction, the data processing means 10 starts loopback while processing the B channel data based on the contents of the data processing instruction. The ISDN terminal can test the normality of the transmission characteristics of the path by sending out a test data pattern to the B channel, checking and comparing whether the data is returned in accordance with the data processing instructions. ISD
If the data processing instruction is changed from the N terminal 1, the loop back test device processes the data according to the instruction, so that a detailed transmission characteristic test can be performed.

[Effects of the Invention] As explained above, the present invention provides an ISDN user/network interface means 4, an LAPD interface means, and a B channel interface means having a data processing means, thereby allowing arbitrary communication from the ISDN terminal side. It becomes possible to perform detailed loop back tests based on data processing instructions, and has the effect of checking the normality of S interface lines, network terminals, interface lines, digital subscriber circuits, and network buses.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating a basic access embodiment of the ISDN user-network interface of the present invention. DESCRIPTION OF SYMBOLS 1...ISDN terminal, 2...S interface, 3...Network terminal, 4...U interface, 5...Digital subscriber circuit, 6...Network, 7...Loop back Test device, 8...U interface 2 part, 9...LAPD interface part, 10...data addition channel interface part, 11...control part.

Claims (1)

[Claims] ISDN user/network interface means and LAP
It has D interface means, B channel interface means, and data processing means provided in the B channel interface means, and processes received data and loops it back based on information received by the D channel interface means. Features of ISDN switch loop back test equipment.