JPH04259139A - Isdn packet communication test control system and isdn packet communication matching performance test equipment - Google Patents

Abstract

PURPOSE:To select an ISDN call control test or a packet communication matching test of a terminal equipment automatically and to test the selected test with respect to the test control system for the terminal equipment implementing packet communication through an ISDN B-channel CONSTITUTION:The above system is provided with an ISDN call control test control means 2 controlling a confirmation test of a call control operation of a tested terminal equipment 1, an ISDN call control test execution means 3 executing the confirmation test of the call control operation of the tested terminal equipment under the control of the means 2, a packet communication test control means 4 controlling the communication matching test of a packet communication terminal equipment, a packet communication test execution means 5 executing the communication matching test of B-channel packet communication to the tested terminal equipment 1 under the control of the means 4, and a test changeover means 6 which selects the control to the packet communication test control means 4 when the ISDN call control test control means 2 confirms the normality of the setup operation of the tested terminal equipment 1 and selects the control to the ISDN call control test control means 2 when the packet communication test control means 4 finishes the communication matching test.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test control system and a communication consistency tester for a terminal that performs packet communication using an ISDN B channel.

[0002] In recent years, packet communications using ISDN (Integrated Services Digital Network) are becoming popular. IS
There are two types of packet communication using DN, one using B channel and the other using D channel, but packet communication using B channel (hereinafter referred to as B channel packet communication) ensures consistency of interconnection with existing data networks. In order to achieve this, communication is performed using the same frame structure and the same procedure (protocol).

[0003] On the other hand, for a terminal connected to the S/T point of the ISDN subscriber interface and performing packet communication, it is important to check whether the terminal is performing state transitions specified by technical standards in each state of packet communication. A communication integrity test is conducted to verify that the

FIG. 4 is a conceptual diagram of connections when performing a test. The protocol tester 32 in FIG.
An NT (Network Terminal) connected to an ISDN exchange (not shown) via an SDN subscriber line.
The terminal under test (TE) 31 is tested in a manner simulating ISDN at the location of the terminal (on, network terminal equipment).

[0005] As described above, ISDN B-channel packet communication applies the packet communication procedure in the existing data network (for example, the X.25 procedure), so the protocol tester 32 that tests communication Packet communication protocol testers for data networks can be applied as is, but in the case of terminals using ISDN, the terminal under test 31 is
It is necessary to confirm that the call control of N, that is, the call control for setting a state in which B channel packet communication is possible and the call control for terminating a state in which B channel packet communication is possible, is normal.

[0006] However, a test that combines ISDN call control confirmation and packet communication communication integrity testing has not been conducted in the past, and when testing the communication integrity of packet communication on the ISDN B channel, After confirming the normality of the call setting operation in the ISDN call control of the terminal under test, a communication integrity test was performed, and after the test was completed, it was necessary to confirm the normality of the call release operation again.

[0007] Therefore, there is a need for a test control system and a test device that can test the communication integrity of packet communications of terminals that perform packet communications on the ISDN B channel.

[0008]

2. Description of the Related Art FIG. 5 is a diagram illustrating a test method according to the prior art, and FIG. 25 is a test sequence diagram of the No. 25 communication integrity test. FIG.

Packet terminals used in existing data networks, such as X. In order to test the communication integrity of the X.25 packet terminal, X.25 protocol tester can be connected directly. 25
A procedure test can be started, but when testing a terminal that performs ISDN B channel packet communication using the conventional technology, it is necessary to perform the test using the procedure shown in FIG.

That is, first, connect the ISDN call control tester 42 to the terminal under test 41 as shown in FIG. Check. If the call setup is normal, the ISDN call control tester 42 will be activated as shown in Figure 5 (2).
niX. X.25 protocol tester 43 is connected. The communication consistency of the terminal under test 41 is tested using the X.25 protocol tester 43. When the communication integrity test is completed, as shown in FIG. 5(3), the ISDN call control tester 42 is used again to check whether the call control of the terminal under test 41 to release the B channel packet communication enabled state is normal. Check whether

FIG. 6 shows the existing data network or X. 25 protocol tester 43
．． 25 shows a sequence of 25 communication integrity tests. In the figure, i to u are symbols indicating each signal. Also, DCE
and DTE mean terminal control equipment and data terminal when used in existing data networks, respectively in ISDN.
Corresponds to E and NT. In the case of testing, TE is the terminal under test and NT is the protocol tester, but in the following, T
This will be explained using the symbols E and NT.

From the initial state, NT sets i's SABM (Set
Asynchronous Balanced Mo
X.de, link setting activation signal). 25 layer 2 link settings, and the TE sends the UA (Unnu) of j.
An acknowledgment (acknowledgment) is returned and the link setting is completed.

[0013] When the link setting is completed, a logical communication path is set and tested at the packet level by layer 3. First, k's SI (Restart Indi
cation, restart instruction) and SF of m (Re
RESTART, that is, initialization is performed by start confirmation (restart confirmation), and then n's CN (Incoming Call)
and o's CA (Call Accepted)
The packet link for the incoming call is set up.

[0014] This starts a communication integrity test, which is carried out in such a way that the NT sends p packets and the TE returns a q response. p and q are repeated multiple times, including a test in which the NT intentionally sends an irregular packet and the TE's response to it is checked.

[0015] When the test with p and q is completed, C of r
I (Clear Indication, cutting instruction)
and s CF (Clear Confirmation
, disconnection confirmation), the packet link is released, and then the layer 2 link is released using t's DISC (Disconnect, disconnection signal) and u's UA (acknowledgement), and the test ends.

When performing the test shown in FIG. 6 using the ISDN B channel, it is necessary to confirm the normality of call control before and after the sequence shown in FIG. 6, as described above. That is, in the conventional technology, when testing the communication integrity of ISDN B channel packet communication, it is necessary to test call control and communication integrity for each test item using two testers as shown in Figure 5. There is.

[0017]

[Problem to be solved by the invention] In the prior art,
When performing a communication integrity test of packet communication using the ISDN B channel, it is necessary to check the normality of ISDN call control separately before and after the communication integrity test of packet communication, which makes the test complicated. I had a problem.

An object of the present invention is to make it possible to automatically switch between an ISDN call control test and a packet communication integrity test of a terminal.

[0019]

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is a terminal under test, which connects to the S/T point of the ISDN subscriber interface and performs packet communication using the B channel; 2 stores ISDN call control procedures; ISDN call control test control means 3 controls a confirmation test of the call control operation of the terminal under test 1 under the control of the ISDN call control test control means 2; 4 is a packet communication test control means for storing a test procedure for a terminal performing packet communication and controlling a communication integrity test of the terminal under test 1; 5 is a packet communication test control means 4;
This is a packet communication test execution means that executes a communication consistency test of packet communication using the B channel on the terminal under test 1 under the control of .

Further, when receiving a report confirming the normality of the call setting operation in the call control of the terminal under test 1 from the ISDN call control test control means 2, 6 controls the ISDN call control for the terminal under test 1. The test control means 2 switches to the packet communication test control means 4, and when the communication integrity test completion report is received from the packet communication test control means 4, the control is switched from the packet communication test control means 4 to the packet communication test control means 4.
This is test switching means for switching to SDN call control test control means 2.

Further, 7 is an ISDN packet communication consistency test comprising the ISDN call control test control means 2, ISDN call control test execution means 3, packet communication test control means 4, packet communication test execution means 5, and test switching means 6. It is a vessel.

[0022]

[Operation] In FIG. 1, the terminal 1 connected to the S/T point of the ISDN subscriber interface and performing packet communication using the B channel will be described as a terminal to be tested. Note that the functions of the ISDN packet communication test control method and the functions of the ISDN packet communication consistency tester are the same, so they will be explained together.

ISDN call control test control means 2 is an ISDN
The ISDN call control test execution means 3 stores call control procedures and instructs the ISDN call control test execution means 3 about necessary test items when starting a test of the terminal under test 1. ISDN call control test execution means 3 is I
In response to instructions from the SDN call control test execution means 3, for example, ISDN B channel call setting processing is performed for the terminal under test 1, and it is confirmed whether the response from the terminal under test 1 is correct. When it is confirmed that the series of call setting operations have been carried out normally, this is reported to the ISDN call control test control means 2.

In response to this, the ISDN call control test control means 2 notifies the test switching means 6 that the confirmation of the call setting operation in call control has been completed. The test switching means 6 thereby switches control over the terminal under test 1 from the ISDN call control test control means 2 to the packet communication test control means 4.

The packet communication test control means 4 stores test procedures for terminals that perform packet communication, and when control is transferred as described above, instructs the packet communication test execution means 5 to execute a communication consistency test. The packet communication test execution means 5 thereby sends various signals to the terminal under test 1 to test the communication integrity of the packet communication, and confirms whether the responses from the terminal under test 1 to each are correct or not. Upon completion of the series of tests, the packet communication test execution means 5 reports the completion of the test to the packet communication test control means 4.

When the packet communication test control means 4 receives the completion report of the communication consistency test, it reports this to the test switching means 6. In response to this, the test switching means 6 switches control over the terminal under test 1 to the ISDN call control test control means 2 again, and the ISDN call control test control means 2 instructs the ISDN call control test execution means 3 to switch the control over the terminal under test 1 to the ISDN call control test control means 2. test the call release processing of call control. The ISDN call control test execution means 3 sends a call release processing signal to the terminal under test 1, checks whether the terminal under test 1 returns a correct response, and confirms the normality of the series of call release processing. If so, it is reported to the ISDN call control test control means 2 and the test is completed.

As described above, in the present invention, ISDN
Since the call control test and the packet communication integrity test are automatically switched and performed consecutively, the test can be performed efficiently.

[0028]

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a test sequence diagram of the embodiment of the present invention. Figure 2 is claim 1
This is an embodiment that realizes the principle of , and also serves as an embodiment of the ISDN packet communication consistency tester (hereinafter simply referred to as the tester) 7 of claim 2. Note that in FIGS. 2 and 3, the packet communication procedure is X. An example of 25 procedures is shown.

In the figure, 10 is a tester, 11 is an ISD to be tested.
N terminal (TE), 12 is ISDN call control test control unit, 1
3 is an ISDN call control test execution unit, and 14 is an X. 25 test control section, 15 X. 25 test execution unit, 16 test switching control unit, 17 tester basic unit, 18 OS (operating system), 19 test common control unit, 20 protocol control unit, 21 response determination unit, 22 timer unit , 23
is X. 25 a message transmitter, 24 an X. 25 a message receiving unit, 25 an ISDN call control unit, 16 an ISDN message transmitting unit, 27 an ISDN message receiving unit, 2
8 is the display, 29 is the keyboard, 30 is the test target
．． 25 terminals (DTE).

As for the overall operation, the tester basic section 17 of the tester 10 controls the selection of test items, continuous operation, etc., and the ISDN call control test execution section 13 or the X. 25 test execution unit 15 performs message control, transmission and reception processing, and judgment of response signals for each test item. Further, in the test device basic section 17, the test common control section 17 controls the entire test in cooperation with the OS 18, and information necessary for executing the test is inputted and outputted to a keyboard 29 and a display 28 operated by the tester.

The tester 10 in FIG. 2 is an X
．． This example shows a configuration in which it is possible to test 25 terminals. Tested X. When testing X.25 terminal 30 (hereinafter abbreviated as terminal 30), directly test X. The communication integrity of the 25 procedures is tested, but the ISDN terminal under test 11
(hereinafter abbreviated as terminal 11) In order to clarify the difference from the test for terminal 30, the test for terminal 30 will be explained first.

When starting the test of the terminal 30, the test common control section 19
administered the test, and X. 25 causes the test control unit 14 to start controlling the test. X. When the X.25 test control section 14 instructs the protocol control section 20 about test items, test order, etc., the protocol control section 20 generates messages and manages time while executing the X.25 test control section 14. 25 sends a message frame to the terminal 30 via the message sending unit 23.

The response from the terminal 30 is X. The X.25 message is sent to the response determining section 21 via the message receiving section 24, and it is determined whether or not it is the specified response. 25 Test control section 1
4 will be reported. The contents of the message and response during this period are basically the same as those shown in FIG. During this period, the timer section monitors the time from the message transmission from the protocol control section 20 to the reception of the response signal from the response determination section 21 to detect any abnormalities in the response time during the test. Inform.

Next, a test of a terminal that performs packet communication using the ISDN B channel will be explained. In the case of an ISDN terminal test, the ISDN terminal is
The call control test control section 12 is activated, and the ISDN call control test control section 12 instructs the ISDN call control section 25 to execute the test. ISDN call control unit 25 generates messages and manages time, and transmits call setup messages in call control to ISDN.
The message is transmitted via the DN message transmitter 26 to the terminal 11 connected to the S/T point (not shown) of the ISDN subscriber interface.

When the terminal 11 responds to this, a response signal is sent to the ISDN call control section 25, and the ISDN call control section 2
In step 5, the correctness of the response is checked. If all responses are normal and signal transmission/reception is completed, this means that B channel packet communication is possible, so the ISDN call control unit 25 reports this to the ISDN call control test control unit 12. do. ISDN call control test control section 12
This confirms that the call setting in the call control has been completed normally, and notifies the test switching control section 16 of this fact. Based on this notification, the test switching control unit 16 performs X. 25, the control is switched to the test control section 14.

[0036] As a result, X. The X.25 test control unit 14 starts up and sends the X.25 test control unit 14 to the terminal 11. A communication consistency test of packet communication using the 25 procedure is started. X. 25 Test control section 1
4 performs message generation and time management in the protocol control unit 20 as in the case of the terminal 30, but in the case of the terminal 11, X. The message is sent to the ISDN message transmitter 26 instead of to the No. 25 message transmitter 23.

The message is sent to the terminal 11, and when the terminal 11 returns a response, this response signal is sent to the response determining section 21 via the ISDN message receiving section 27, and it is determined whether the response is correct or not. The judgment result is X. 25 Test control section 14
However, once a series of communication integrity tests are completed and normality is confirmed, X. 25 The test control section 14 notifies the test switching control section 16 of the end of the test.

Based on this notification, the test switching control section 16 reverts control over the terminal 11 to the ISDN call control test control section 12.
Then, the ISDN call control test control unit 12 starts a call release test in call control. This call release test is
The call control signal is executed by the DN call control unit 25, but the call control signal is
Sent from the SDN message transmitter 26 to the terminal 11,
The response from the terminal 11 is sent to the ISDN call control section 25 via the ISDN message receiving section 27.

The correctness of the responses is checked in the ISDN call control section 25, and if the series of responses is normal, the ISDN call control section 25 reports to the ISDN call control test control section 12, indicating that the test has ended normally. This is confirmed. The test results are sent to the test common control unit 19 and the OS as necessary.
It is displayed on the display 28 via 18. Note that through the above operations, the timer section 22 performs X. 25 Test Execution Department 1
5, the time of the ISDN call control section 25 is monitored, and if there is an abnormality, the tester basic section 14 is notified.

FIG. 3 shows the ISDN call control test execution unit 13 and X. 3 is a diagram illustrating a sequence of signal exchange performed between the X.25 test execution unit 15 and the terminal 11. Hereinafter, FIG. 3 will be described based on FIG. 2. Note that a to z are symbols indicating each step.

First, a call control test is performed by the ISDN call control test execution unit 13, and FIG. 3 shows an example of testing the call control in a state where an incoming call is received from the ISDN B channel to the terminal 11. Note that all call control signals are sent and received through the ISDN D channel.

First, the ISDN call control section 25 of the tester 10
UISETUP (U
nnumber Information SETU
P, call setup request) is sent to the terminal 11, which indicates that an incoming call has been made to the terminal 11 from the B channel. On the other hand, terminal 11 uses ID RE of b.
ID by Q (ID Request, ID request)
The ISDN call control unit 25 requests the assignment of the ID of c.
ASS (ID Assign, ID assignment) is returned to complete the ID setting. Next, from terminal 11, SA of d
BME (SABMExtended) and the e UA from the tester 10 perform link setting for layer 2 of the D channel.

Next, when a call is made at the terminal 11, a calling signal is sent to the ISDN call control unit 2 by the ALERT of f.
5, and when the terminal 11 enters the response state, CONN (Connect) of g is subsequently sent as a response signal. Upon receiving this CONN, the ISDN call control unit 25 determines that the terminal 11 has performed normal call control, and changes the CONN of h.
NACK (CONNAck.) notifies reception confirmation of the response signal and reports to the ISDN call control test control unit 12 that the call control test has been completed.

When the ISDN call control test control section 12 notifies the test switching control section 16 of this, the control is performed as described above.
．． 25 test control section 14. X. The X.25 test control section 14 instructs the protocol control section 20 to perform the X.25 test control section 14. A communication integrity test of packet communication is performed using the 25 procedure.
The sequence of this test is the same as that shown in FIG. 6, and the details are abbreviated as i to u in FIG.

When the communication integrity test is completed normally, the tester 10 sends a DISC of t to the terminal 11 as a signal to disconnect the layer 2 link on the B channel, and the terminal 11
sends back the UA of u as a reception confirmation signal (
(See Figure 6 for details). The reception of the UA of u for the DISC of t means that the packet communication integrity test according to the packet procedure has been successfully completed, so the protocol control unit 2
0 is this 25 report to the test control section 14.

X. When the T.25 test control section 14 notifies the test switching control section 16 of this, control is again switched to the ISDN call control test control section 12, and the call release process in the call control is tested via the ISDN call control section 25.

In the call release process, the tester 11 sends the DISC of v as an instruction to release the B channel packet communicable state.
All subsequent signals are sent and received through the D channel. The terminal 11 that has received the DISC of v returns the REL of w, and in response, the tester 11 returns the RELCOMP of x, thereby releasing call control. Next, the tester 11 sends a DISC of y, and the terminal 11 returns a UA of z, thereby releasing layer 2 of the D channel and completing all tests. The end of the test is reported from the ISDN call control section 25 to the ISDN call control test control section 12, and then necessary processing is performed via the test common control section 19.

As described above, in the present invention, the communication integrity of the call control test performed using the ISDN D channel and the packet communication (based on the X.25 procedure, etc.) performed using the B channel are continuous. Therefore, it is possible to efficiently test the communication integrity of packet communication on the ISDN B channel.

Although the embodiment of the present invention has been described above with reference to FIGS. 2 and 3, FIGS. 2 and 3 are only one embodiment of the present invention, and the configuration and sequence are not limited to those shown in FIGS. 2 and 3. Of course. For example, the configuration of the tester basic section 17 may have various configurations other than that shown in FIG.
Processing assignment of the SDN call control unit 25 or X. It goes without saying that the processing division between the X.25 test control section 14 and the protocol control section 20 is not limited to that shown in FIG. Furthermore, it is clear that the effects of the present invention do not change even if the timer section 22 is provided within the tester basic section 14.

[0050]

[Effects of the Invention] As explained above, according to the present invention,
ISDN call control tests and packet communication communication integrity tests for terminals that perform packet communications using the ISDN B channel are automatically switched, making it possible to perform the tests continuously. The efficiency of testing the communication integrity of B-channel packet communications is significantly improved.

[Brief explanation of the drawing]

[Figure 1] Diagram explaining the principle of the present invention

[Figure 2] Embodiment configuration diagram of the present invention

[Figure 3] Example test sequence diagram of the present invention

[Figure 4]
Test connection conceptual diagram

[Figure 5] Diagram explaining the test method using conventional technology

[Figure 6]
X. 25 Communication integrity test sequence diagram

[Explanation of symbols]

1 Terminal under test 2 ISDN call control test control means 3 ISDN call control test execution means 4 Packet communication test control means 5 Packet communication test execution means 6 Test switching means

Claims (2)

[Claims] [Claim 1] S of ISDN subscriber interface
A test control method for terminals connected to /T point and performing packet communication using the B channel, which stores ISDN call control procedures and controls confirmation tests of call control operations of the terminal under test (1). ISDN call control test control means (2); and ISDN call control test execution means (3) for executing a confirmation test of the call control operation of the terminal under test (1) under the control of the ISDN call control test control means (2). Terminal under test (1) by memorizing the test procedure for a terminal that performs packet communication.
A packet communication test control means (4) for controlling the communication integrity test of the terminal under test (1) under the control of the packet communication test control means (4). When receiving a report confirming the normality of the call setting operation in the call control of the terminal under test (1) from the packet communication test execution means (5) to be executed and the ISDN call control test control means (2), Control over the terminal (1) is performed by the ISDN call control test control means (2) and the packet communication test control means (
4) When a communication integrity test completion report is received from the packet communication test control means (4), control is transferred from the packet communication test control means (4) to the ISDN call control test control means (2). Test switching means (6
) ISDN packet communication test control method characterized by comprising: [Claim 2] ISDN call control test control means (2) and ISDN call control test execution means (3) according to claim 1.
, packet communication test control means (4), packet communication test execution means (5), and test switching means (6),
B at the S/T point of the ISDN subscriber interface
IS for terminals that perform packet communication using channels.
An ISDN packet communication consistency tester characterized in that the test is performed by automatically switching between a DN call control test and a packet communication communication consistency test.