JPH04185036A - Transmission test method for isdn terminal equipment - Google Patents

Abstract

PURPOSE:To simplify transmission test work by oppositely connecting two ISDN terminal equipment, and performing a transmission test by connecting prescribed information channels with each other. CONSTITUTION:When the transmission test of ISDN facsimile equipment is performed, two ISDN facsimile equipment FXA, FXB are oppositely connected by using a cross cable CX. When a mutual data transmittable state for the equipment FXA and FXB is set, the equipment FXB sends a prescribed signal INFO1, and the equipment FXA, when receiving the signal, issues a response of signal INFO2. Thence, the equipment FXB sends a signal INFO3, and the equipment FXA, when receiving the signal, sends a signal INFO4, thereby, the layer 1 of a D-channel is started up. In such a way, when the layer 1 of the D-channel is established, the equipment FXA, FXB form a communication path by using, for example, a B1-channel, and execute a transmission procedure on an information channel, and transmit test data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission testing method for an ISDN terminal device that uses ISDN as a transmission path.

[Prior Art] Generally, when testing the operation of ISDN terminal equipment that uses ISDN as a transmission path, two ISDN terminal equipment are either actually connected to the ISDN, or they are interconnected using an ISDN pseudo switch. , when one ISDN terminal device calls another ISDN terminal device and an information channel is established, the transmission procedure on the information channel is executed,
It is used to transmit test data, etc.

[Problems to be Solved by the Invention] However, such conventional methods have the following disadvantages.

In other words, as mentioned above, in order to test the operation of ISDN terminal equipment, it is necessary to connect directly to ISDN or use an ISDN pseudo switch, which is costly and complicated. It had become.

To resolve this inconvenience, for example,
It is sufficient to equip a DN terminal device with an rsDN pseudo exchange function, but the ISDN switching function is very complicated, and therefore, an ISDN terminal device equipped with such a function has a complicated configuration and is expensive. This causes an inconvenience.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmission testing method for an ISDN terminal device that is low cost and has good workability.

[Means for Solving the Problems] The present invention includes a transmission means having a layer 1 signal control function equivalent to a network terminal device, and connects two ISDN terminal devices oppositely through a signal line that can mutually transmit signals. Then, one of the oppositely connected ISDN terminal devices is activated in network termination device mode, the layer 1 protocol is activated from the other ISDN terminal device, and when layer 1 is established between the oppositely connected ISDN terminals, the predetermined information is transmitted. Connect channels to each other,
The test data is transmitted by executing the transmission procedure on the information channel.

[Operation] Therefore, since the equipment functions added to perform the test are minimized, the cost of the equipment can be kept down. Further, since there is no need to use a special exchange or ISDN pseudo exchange, testing work can be easily performed.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an ISDN facsimile apparatus according to one embodiment of the present invention.

In the figure, a control unit 1 performs control processing for each part of this ISDN facsimile device, high-layer group 4 facsimile function processing, transmission test processing, etc. It stores a control processing program to be executed and various data required when executing the processing program, and constitutes a work area of the control section 1.

The parameter memory 3 is for storing various information specific to this ISDN facsimile device and information such as images of test patterns to be transmitted during transmission tests.
The clock circuit 4 is for obtaining the current time.

The scanner 5 is for reading a document image at a predetermined resolution, the plotter 6 is for recording and outputting an image at a predetermined resolution, and the operation display section 7 is for operating this facsimile device. It consists of various operation keys and various displays.

The encoding/decoding unit 8 encodes and compresses the image signal, and decodes the encoded and compressed image information into the original image signal, and the image storage device 9 encodes and compresses the encoded and compressed image information. This is for storing a large amount of image information in a different state.

The ISDN interface circuit 10 is for physically connecting to the ISDN, and is for layer 1 signal control section 11.
is equipped with an ISDN layer 1 signal processing function and a function of integrating/separating a D channel (signal channel) signal and two B channel (information channel) signals.

The layer 1 signal control unit 11 also has a layer 1 signal control function of an ISDN network terminal (NT).

The D channel transmission control unit 12 uses the D channel to
It is for performing transmission control processing such as call control processing performed with SDN, and the B channel transmission control unit 13.14 performs layer 2 of Group 4 facsimile transmission control processing using the B channel (information channel) of ISDN. ．． 3
．． 4. This is for performing the transmission control processing of No. 5.

These control section 1, system memory 2, parameter memory 3, clock circuit 4, scanner 5, plotter 6, operation display section 7, encoding/decoding section 8, image storage device 9, D channel transmission control section 12, and , B channel transmission control section 13
．． 14 is connected to a system bus 15, and data exchange between these elements is mainly performed via this system bus 15.

With the above configuration, when performing a transmission test on the I SDN facsimile machine shown in Figure 1, two I
Connect SDN facsimile devices FXA and FXB face-to-face using cross cable CX.

As shown in Fig. 3, this cross cable CX
3. Connector CNI for connecting to DN facsimile device FXA. 4. 5. 4 of the connector CN2 for connecting the 6th pin to the ISDN facsimile device FXB. 3. 6. It is connected to pin 5.

As a result, the positive polarity transmission data TD (+) of the ISDN facsimile device FXA becomes the positive polarity reception data RD (+) of the ISDN facsimile device 1iFXB.
The negative polarity transmission data TD (-) of the ISDN facsimile device FXA is received as the negative polarity reception data RD (-) of the ISDN facsimile device FXB.
), and the positive polarity transmission data TD (+) of the SDN facsimile machine FXB is received as
The positive polarity reception data of the DN facsimile device FXA is received as RD (+), and the negative polarity transmission data TD (-) of the ISDN facsimile device FXB is received as IS
It is received as negative polarity reception data RD (-) of the DN facsimile device FXA.

This allows ISDN facsimile equipment FXA and ISD
N facsimile devices FXB are physically connected, and thereby ISDN facsimile devices FXA and ISDN facsimile devices FXB are in a state where they can mutually transmit data.

When the preparations for the transmission test are completed in this way, the operator inputs a command to execute the transmission test with the ISDN facsimile device FXA set to the network terminal equipment side, and then
Input a command to execute a transmission test in terminal mode to the facsimile device FXB.

As a result, as shown in FIG.
Upon receiving I, the ISDN facsimile device FXA:
Similar to the ISDN network termination device, the predetermined signal INFO2
respond.

I SDN facsimile device FXB uses signal INFO2
When receiving, next, it sends out a predetermined signal INFO3,
When the ISDN facsimile device FXA receives the signal INFO3, it sends out a predetermined signal INFO4, thereby activating layer 1 of the D channel.

In this way, ISDN facsimile installation ff1FXA
When D channel layer 1 is established between ISDN facsimile device FXB and ISDN facsimile device FXA,
and ISDN facsimile device FXB each connect a predetermined information channel, for example, a B1 channel, and form a communication path using this B1 channel.

After this, a predetermined transmission procedure is performed using the B1 channel, and the ISDN facsimile equipment fiFXB converts the test pattern image into image information, and the image information is transferred to the ISD
Send to N facsimile device FXA.

When the ISDN facsimile apparatus FXA receives the image information, it decodes the received image information and records and outputs the resulting image signal from the plotter 6.

When the image information transmission for the transmission test is finished, the ISDN
The facsimile device FXA sends out a predetermined signal INFOO as a D channel signal to terminate the connection with the ISDN facsimile device ff1FXB, and ends the transmission test operation.

I SDN facsimile machine FXB uses the signal INFOO
When receiving , it sends out the signal INFOO and ends the transmission test operation.

In this way, in this embodiment, the transmission test of the ISDN facsimile machine FXB is performed by directly connecting the SDN facsimile machine FXA and the ISDN facsimile machine FXB, making the transmission test work very simple.

Further, in this case, since the layer 1 signal control unit 11 is only provided with the layer 1 control function of the network termination device, an increase in device cost can be suppressed as much as possible, and the transmission test function can be realized at low cost.

Figure 5 shows the I
An example of the operation of the SDN facsimile device is shown.

First, when a signal INFOI sent from an ISDN facsimile device in terminal mode is received (process 101), a signal INFO2 is sent (process 102), and a signal INFO3 is received.
When receiving (processing 103), the signal INFO4 is sent out (processing 104), and the B1 channel, which is the information channel for testing, is connected (processing 105).

Then, using this B1 channel, a predetermined group 4 facsimile transmission pre-transmission procedure in the incoming call mode is performed (processing 1
06), the test image information is received and the received image is recorded and output (process 107).

When the received image is completed, a predetermined group 4 post-facsimile transmission procedure is performed (process 108), and the B1 channel is released (process 109). Then, in order to complete the transmission test with the opposite ISDN facsimile device, the signal IN
When the FOO is sent (process 110) and the signal INFOO is received (process 111), the series of transmission test operations is completed.

Figure 6 shows the I
An example of the operation of the SDN facsimile device is shown.

First, the process of sending the signal INFOL to the other party's ISDN facsimile device set as the network termination device (201)
, In contrast, when receiving the signal INFO2 from the partner device (process 202), the process 2 sends the signal INFO3.
03), upon receiving the signal INFO4 (processing 204),
Connect the B1 channel, which is the information channel for testing (
Processing 205).

Then, using this B1 channel, predetermined group 4 facsimile transmission pre-transmission procedures in call mode are performed (processing 2
06), the image information of the test pattern image is transmitted as test image information (process 207).

When the received images are completed, the predetermined group 4
A post-transmission procedure is performed (process 208), and the B1 channel is released (process 209). Then, when the signal INFOO is received from the partner device (process 210), the signal IN
Processing to transmit FOO 211) Ends a series of transmission test operations.

Incidentally, in the embodiments described above, the present invention is applied to an ISDN facsimile device that uses ISDN as a transmission line, but the present invention can be similarly applied to other ISDN terminal devices.

In addition, the cross cable used in the above example is
Of the 8-pin signal ends of the basic ISDN interface, only the transmitting and receiving input ends are interconnected, but the power feeding end and the load end can also be interconnected.

[Effects of the Invention] As described above, according to the present invention, the device functions added to perform a transmission test are minimized, so the device cost can be suppressed.

Furthermore, since there is no need to use a special switch or ISDN pseudo switch, the test work can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an ISDN facsimile device according to an embodiment of the present invention, FIG. 2 is a schematic diagram illustrating a connection mode during a transmission test, FIG. 3 is a circuit diagram showing an example of a cross cable, and FIG. Figure 4 is a timing chart showing an example of the transmission procedure during a transmission test, Figure 5 is a flowchart illustrating the operation during a transmission test of a terminal set on the network termination equipment side, and Figure 6 is a timing chart showing an example of the transmission procedure during a transmission test. 3 is a flowchart illustrating an example of an operation during a transmission test of a terminal.

Claims (1)

[Claims] In a transmission test method for ISDN terminal equipment that uses ISDN as a transmission path, two ISDN terminal equipment are connected by a signal line that is equipped with a transmission means equipped with a layer 1 signal control function equivalent to that of a network termination equipment and that can mutually transmit signals. Connect oppositely,
Start one of the oppositely connected ISDN terminal devices in network termination device mode, and then
ISDN characterized in that when a protocol is activated and layer 1 is established between oppositely connected ISDN terminals, predetermined information channels are interconnected, transmission procedures on the information channels are executed, and test data is transmitted. Transmission test method for terminal equipment.