JPH03230653A - Operation test method for isdn terminal equipment - Google Patents

Abstract

PURPOSE:To surely check the propriety of a function of a data transmission reception system by sending a data actually from an ISDN terminal equipment to a network, receiving the data at the terminal equipment itself via an ISDN exchange and comparing transmission reception data. CONSTITUTION:A DSU (subscriber side line terminator) 9 connects to an ISDN subscriber line 10 and an S interface section 8 of a terminal equipment connects to a subscriber's bus extracted from the DSU 9. An equipment control section 1 realizes the function of layers 4-7 and realizes an information service in a form desired by the user in cooperation with an operation panel 2, a data input output section 5 and a data storage section 6 or the like. When an ISDN exchange and a terminal equipment are connected, a data sent from the terminal equipment reaches the exchange via one B channel and returns to the terminal equipment via the B channel, then the transmission data and the reception data are compared by the terminal equipment. Thus, the propriety of the function of the data transmission reception system is surely checked.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ISDN terminal device, which is a user terminal of an ISDN (Integrated Services Digital Network) communication system, and particularly to an operation test method for examining its data transmission and reception functions.

The interface between the network and the user in the conventional ISDN communication system complies with the CCI TT Recommendation.
Functions corresponding to layers 1 to 3 of the O8I reference model are standardized. The specific configuration on the user side is ■S
A DSU (premises circuit termination unit) is connected to the subscriber line connected to the DN exchange, a domestic bus is drawn out from this DSU, and up to eight ISDN terminal devices can be connected to this domestic bus in a multi-point wiring configuration. can.

When testing the data transmission and reception operations of ISDN terminal devices, conventionally the operation was examined only within the terminal device's circuit without connecting the terminal device to the network.

Specifically, the communication control unit is controlled by software, and the test is performed by looping the transmit data line and the receive data line within that circuit.The communication control unit is provided with an input/output terminal, and the data is sent to that terminal. A method is known in which a test is performed by connecting a connector that loops a data line and a received data line.

Problem to be Solved by the Invention In both the former method of looping the transmitted and received data within the circuit of the communication control unit, and the latter method of looping the transmitted and received data at the input and output terminals of the communication control unit, the circuit on the network side from the communication control unit , that is, LAP B (1ink acc
ess procedure, balanced
) It was not possible to test the comprehensive data transmission/reception operation including the functions of the control section, S interface section, and D channel network control section, but only a very local test of the communication control section.

This invention was made in view of the conventional problems mentioned above, and its purpose is to test the operation of an ISDN terminal device by making it possible to check the overall functionality of a system that actually transmits and receives data through a network. Our goal is to provide the following.

Means for Solving the Problem Therefore, in this invention, ■ SDN terminal equipment is actually used as an ISD.
It connects to the N subscriber line and executes line connection processing to call the terminal device itself under control of the D channel, connects the terminal device and the ISDN exchange on one of the two B channels, and connects the terminal device on the other B channel. The terminal device is connected to the ISDN exchange through the B channel, data is sent from one B channel, and the data that has passed through the ISDN exchange is received through the other B channel.

Operation When an ISDN exchange and a terminal device are connected by the method of the present invention, data sent from the terminal device reaches the exchange via one B channel, and from there is transmitted to the terminal device via the other B channel. come back. By comparing the transmitted data and the received data at the terminal device, it is possible to check whether the data transmitting/receiving system is functioning correctly.

Embodiment FIG. 4 shows a typical configuration of an ISDN terminal device. A DSU (home line termination unit) 9 is connected to the ISDN subscriber line 10, and an S interface unit 8 of a terminal device is connected to a home bus led out from the DSU 9.

The S interface unit 8 is a circuit unit that has an S interface and a T interface, which are standardized as the ■ series of CCITT recommendations. Separation and multiplexing are performed.

The D channel signal line is layer 2 (LAPD) of the D channel.
) and layer 3 (call control, etc.) functions. The signal lines of the B1 channel and B2 channel are connected to the layer 3 via the LAPB control unit 7 that supports the layer 2 (LAPB) function of the B channel.
It is connected to a communication control unit 4 that supports the following functions.

The device control unit 1 realizes the functions of layers 4 to 7,
It cooperates with the operation panel 2, data input/output unit 5, data storage unit 6, etc. to realize the information service in the form desired by the user.

In the ISDN terminal device having the above configuration, the present invention performs a data transmission/reception operation test using the following method.

FIG. 1 is a diagram showing the line connection processing, which is the main part of the present invention, as a process flow between the SDN exchange, the network control section 3, and the device control section 1, and FIG. The flow of the operation of the network control unit 3 in the above process is shown.

First, when the operator inputs an instruction to perform a data transmission/reception operation test using the operation panel 2, the device control unit 1 first creates test data and temporarily stores it in the data storage unit 6, and also sends the network control unit 3 to its own address. Instruct the person to make a call. Upon receiving this instruction, the network control unit 3 starts operating, establishes a link with the network, and then sends a call setup message that includes the transmission capability and the called number of its own address (assigns "1" as the call number). Send out.

After that, a call setup acceptance message containing a channel identifier is sent from the engineering SDN exchange side (the call number is 1 t).
II) will be received. Based on the channel identifier of this call setup acceptance message, the exchange side specifies which of the B1 channel and the B2 channel the calling party will use. Next, it receives a call setup message (the call number is tt 2 n) including the transfer capability and channel identifier sent from the exchange side. Upon receiving this, the network control section 3 notifies the device control section 1 of this fact (incoming call notification).

The device control unit 1 that received the incoming call notification sends the following information to the network control unit 3.
In response to the call setting message, an instruction is issued to connect the line. Then, the network control unit 3 sends a response message (the call number is "2 rL") to the network. In response to this, the exchange sends a response message (call number 1'') to the terminal device, and further sends a response confirmation message (call number l12#).

With the above procedure, a connection state is established in which the terminal device is connected to the ISDN exchange on one of the two B channels, and the terminal device is connected from the ISDN exchange on the other B channel. In other words, the communication control unit 4 of the terminal device
A transmission/reception loop is formed by a route from the ISDN exchange to the ISDN exchange via the B1 channel, and a route from the ISDN exchange to the communication control unit 4 via the B2 channel.

When the above-mentioned line connection process is completed, the device control unit 1
The test data previously created and stored in the data storage section 6 is passed to the communication system section 4, and an instruction is given to execute a test data transmission/reception test. In response to this, the communication control section 4 transmits the test data using the B1 channel, and transfers the test data via the exchange received from the B2 channel to the device control section 1 (the above operation of the communication control section 4 is performed). (It is organized and shown in the flowchart in Figure 3)
. The device control section 1 compares the received data transferred from the communication control section 4 with the test data (transmission data) stored in the data storage section 6, and stores the result.

After performing the data transmission/reception test as described above, next, line disconnection processing is executed.

The network control unit 3, which received the instruction to disconnect the line from the equipment control unit 1, sends a disconnection message (call number 1") to the network, and then receives an O disconnection message (call number 2") from the exchange side.
II), and when it receives the disconnection message, it notifies the device control unit 1 of this fact. Here, the device control section 1 instructs the network control section 3 to release the line in response to the disconnection message. In response to this, the network control unit 3 sends a release message (call number ``2'') to the network, and then receives a release completion message (call number 2'') from the exchange side. 1
After that, a release message (call number ``1'') is received from the exchange, and in response, a release completion message (call number 111) is sent to the network, and the equipment control unit Notify 1. This means that both the lines on the called and calling sides have been released.

When the above sequence is completed, the device control section 1 displays the stored test results (comparison results of transmitted and received data) on the display on the operation panel 2, and returns to the standby state.

Effects of the Invention As explained in detail above, according to the test method according to the present invention, ■Actually sending data from an SDN terminal device to the network, and receiving the data by the terminal device itself via an ISDN switch. Since it is possible to compare the transmitted and received data, it is possible to test the system related to the actual =9 data transmission and reception as a whole and comprehensively. You can check it out.

[Brief explanation of drawings]

FIG. 1 is a sequence diagram of line connection and release processing, which is the main part of the present invention; FIG. 2 is a flowchart showing the operation procedure of the D channel network control device in line connection and release processing; 4 is a flowchart of data transmission/reception operations by the communication control section after line connection, and FIG. 4 is a block diagram showing a typical configuration of an ISDN terminal device.

Claims (1)

[Claims] Actually connect the ISDN terminal equipment to the ISDN subscriber line,
By controlling the D channel, a line connection process is executed to make a call to the terminal device itself, and one of the two B channels connects the terminal device and the ISDN exchange, and the other B channel connects the terminal device from the ISDN exchange to the terminal. ISDN characterized in that devices are connected, data is sent from one B channel, and the data transmitted via an ISDN exchange is received via the other B channel.
Operation test method for terminal equipment.