JPH0438045A - Loopback test system - Google Patents

Abstract

PURPOSE:To confirm the normality of the composite terminal equipment and the ISDN network in real time by providing a loopback test function to a terminal adaptor connecting to the integrated services digital network not having a packet handler. CONSTITUTION:Upon the receipt of a test data, an LB test data transmission reception means 15 of an opposite terminal adaptor 1 identifies it that the LB information is added to the test data and returns the received test data via an ISDN subscriber line 3. The LB test data transmission reception means 15 of a sender side terminal adaptor 1 receives the returned test data and outputs the received test data to a composite terminal equipment 2 via an LB test execution control means 14. The composite terminal equipment 2 collates the data applied as the test data with the returned test data and whether or not the data transmission reception is normal in the opposite composite terminal equipment and the ISDN network is immediately recognized depending whether the data are coincident.

Description

[Detailed Description of the Invention] [Summary] Regarding a loop bank test method in a digital integrated service network that does not have a packet handler, a loopback test function is provided for a terminal adapter connected to a digital integrated service network that does not have a packet handler. A terminal adapter that has a communication processing section and is connected to an ISDN exchange without a packet handler via a composite terminal at one end and a 1SDN subscriber line at the other end, a loopback function setting means for providing a loop bank test function to the communication processing unit of the terminal adapter under the control of a terminal; and starting execution of a loopback test with the other composite terminal via the ISDN exchange under the control of the composite terminal. At this time, the presence or absence of the loopback test function setting is inputted from the loopback function setting means, and the presence or absence of the loopback test function is mutually confirmed with the partner multifunction terminal via the call setting processing section of the communication processing section. loopback test execution control means for controlling execution of a loopback test within the terminal adapter under control of the compound terminal; and within a communication processing section under the control of the loopback test execution control means. Sending test data with information indicating that loopback is necessary to the partner multifunction terminal, and transmitting the test data via the loopback test execution control means when the test data is returned from the partner multifunction terminal. and a loopback test data transmitting/receiving means for transmitting the test data to the composite terminal and returning the test data to the partner composite terminal when the test data is received from the partner composite terminal.

[Industrial application field]

The present invention relates to a loopback test method in a digital integrated service network that does not have a packet handler.

Digital comprehensive service #14 (hereinafter referred to as I) in recent years
In connection with the spread of the SDN network (hereinafter referred to as the SDN network), the CCITT (International Telegraph and Telephone Consultative Committee)
Recommendations are being made to define communication procedures for connecting to Nm.

In the case of a so-called composite terminal that has both a telephone function and a data communication function, for example, one of the above-mentioned CCITT recommendations, ■120
Connecting to a digital exchange with ISDN functions (hereinafter referred to as ISDN exchange) via a digital subscriber line (hereinafter referred to as ISDN subscriber line) using communication procedures and utilizing the functions of the ISDN network. is possible. In this case, the complex terminal is a conventional modem (
(1) Connect to the rsDN subscriber line via a terminal adapter containing a built-in (120) communication processing unit that performs communication processing using the (1)120 communication procedure instead of (1) MODEM.

When transmitting and receiving data to and from a partner compound terminal connected via such a compound terminal/month 5 DNI, it is natural that the transmitted data must reach the destination compound terminal accurately, but in order to do so, There is a need for a service that can confirm in real time that the transmitted data has been accurately sent to the destination multifunction terminal.

On the other hand, the ISDN includes a packet handler (hereinafter referred to as P) to enable packet communication via ISDNm.
There are networks with PH (abbreviated as H) and networks without PH, but in ISDN networks with PH, data in units of frames sent from a composite terminal is looped back by the other composite terminal, and the data is returned to the transmitting composite terminal. lr! to confirm whether the data was sent correctly or not. It has a loopback test function that can be tested. However, ISDNli without PH
It was not possible to perform a loopback test on the compound terminal connected to i even if a terminal adapter with a v120 communication processing section was used.

For this reason, ■1 for ISDN1ii which does not have a PH.
There is a need to be able to perform loopback testing using communication capabilities, such as the 20 communication facility.

[Conventional technology]

FIG. 5 is a connection diagram of the prior art.

Figure 5 shows ■12 between the compound terminal 22a and the compound terminal 22b.
0 communication function is shown, and the composite terminals 22a and 22b are connected to ISDN via terminal adapters 21a and 21b, respectively.
Connected to subscriber lines 23a and 23b, ISDN exchange 2
Communication is carried out via 4. In this case, the 120 communication function is provided in the terminal adapters 21a and 2Lb as V120 communication processing units 25a and 25b, respectively, to control communication processing.

In the above, if the ISDN exchange 24 in FIG. 5 has a PH, the ISDN
In packet communication using the network communication channel (B channel), data can be looped back by the ISDN switch 24.
By performing a loopback test from 2a or 22b, it is possible to check the total normality of the composite terminal and the ISDN network in real time.

However, if the ISDN exchange 24 does not have a PH, data communication is carried out end-to-end between compound terminals in conventional services that use the 120 communication function, so the loop within the compound terminal Loopback tests cannot be performed unless the backing function is provided.

In order to provide the above-mentioned loopback function to the compound terminal,
It is necessary to perform this within the scope of the functions that are entrusted to the user in the CCITT recommendations, but at present, the CCITT
There is no provision regarding loopback in the CITT recommendations, so it is not being implemented.

For this reason, in the prior art, when data is transmitted from the multifunction terminal 22a in FIG. It was not possible to judge whether the transmission was good or bad, and the only way to do so was to mutually acknowledge the transmission and reception status over the phone after the communication was completed.

[Problem B to be solved by the invention] In the conventional technology, when connected to an ISDN network that does not have a PH, it is not possible to perform a loopback test, and the quality of transmission and reception is checked by telephone etc. after the end of communication. I had to.

An object of the present invention is to provide a loopback test function to a terminal adapter connected to a digital integrated service network that does not have a packet handler.

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, 1 has a communication processing unit 11, and one end is a composite terminal 2,
2 is a terminal adapter whose other end is connected to an ISDN exchange 4 without a PH (packet handler) via an ISDN subscriber line 3; 2 is a composite terminal with multiple functions such as a telephone call function and a data communication function; 3 4 is an ISDN subscriber line accommodated in an ISDN exchange, and 4 is an IS without PH.
DN exchanges 11 to 16 are provided in the terminal adapter 1, 11 is a communication processing unit, and 12 is a communication processing unit 11 of the terminal adapter 1 under the control of the composite terminal 2 to provide a loopback test function. A loopback function setting means 13 configures a loopback test function setting from the loopback function setting means 12 when starting execution of a loopback test with a partner multifunction terminal via the ISDN exchange 4 under the control of the multifunction terminal 2. Loopback function confirmation means 14 inputs the presence or absence of the loopback test function and mutually confirms the presence or absence of the loopback test function with the partner multifunction terminal via the call setting processing section 16 of the communication processing section 11; Loopback test execution control means 15 controls the execution of a loopback test within the terminal adapter 1;
4, in the communication processing unit 11, test data with information indicating that loopback is required is transmitted to the partner multifunction terminal, and when the test data is returned from the partner multifunction terminal, the test data is transmitted to the communication processing unit 11. A loopback test data transmitting/receiving means that sends data to the multifunction terminal 2 via the loopback test execution control means 14, and returns the test data to the other multifunction terminal when the test data is received from the other multifunction terminal. be.

[For production]

In FIG. 1, compound terminal 2 is terminal adapter 1.
However, when adding a loopback function to the communication processing unit 11, the multifunction terminal 2 connects to the ISDN exchange 4 which does not have a PH. It sends an instruction to add the LB function to the device. When the LB function setting means 12 inputs the instruction, it stores it as information for adding the LB function.

Next, in order for the compound terminal 2 to perform data communication with the partner compound terminal (not shown), the LB
We will explain when to execute the test.

First, the compound terminal 2 controls the LB function confirmation means 13 to mutually confirm the presence or absence of the LB function with the partner compound terminal.

The LB function confirmation means 13 confirms from the LB function setting means 12 that the LB function has been set in the own multifunction terminal 2, and uses the call setting processing section 160 function of the communication processing section 11 to connect the other multifunction terminal and the user. Information is exchanged, and the presence or absence of the LB function of the other party's multifunction terminal is confirmed. As a result, if it is confirmed that the other party's multifunction terminal has the LB function, the LB
The function i recognition means 13 stores this.

Next, the compound terminal 2 controls the LB test execution means 14 to execute the LB test. First, information indicating that it is necessary to loop back the data transmitted from the compound terminal 2 to the partner compound terminal via the LB test execution means 14 to the LB test data transmitting/receiving means 15 in the communication processing section 11 is sent. (hereinafter referred to as LB information) and test data. At this time, the LB test execution control means 14 accesses the LB function setting means 12 and the LB function confirmation means 13, confirms that both the own compound terminal 2 and the partner compound terminal have the LB function, and the LB test data transmitting/receiving means Let 15 know.

The LB test data transmitting/receiving means 15 adds the LB information and transmits the test data to the partner composite terminal according to a predetermined procedure. Although the destination compound terminal is also connected via the same terminal adapter (not shown) as the terminal adapter 1 in FIG. 1, the terminal adapter 1 in FIG. 1 will be described below as the destination terminal adapter.

When the LB test data transmitting/receiving means 15 of the partner terminal adapter 1 receives the test data via the ISDN subscriber line 3, it identifies that the LB information is added to the test data, and loops the received data. After confirming that it is necessary to back up, the received test data is sent back via the ISDN subscriber line 3.

Below, connect terminal adapter 1 to the sending terminal.
It will be explained as an adapter. In the terminal adapter 1 on the sending side, the LB test data transmitting/receiving means 15 receives the returned test data, and outputs the received test data to the composite terminal 2 via the LB test execution control means 14. The multifunction terminal 2 compares the data input as test data with the test data sent back, and depending on whether they match or not, it is possible to immediately know whether data transmission and reception between the other multifunction terminal and the TSDNI is normal. .

As described above, it becomes possible to perform a loop puncture test even on a terminal adapter connected to a digital integrated service network that does not have a packet handler.

[Example] Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a block diagram of a test data frame of an embodiment of the present invention, and Fig. 4 is a diagram of test data transmission and reception in an embodiment of the present invention. It is a procedure diagram.

In the figure, objects that are the same as those in Figure 1 are given the same symbols, and the transmitting side components are denoted by a, and the receiving side components are denoted by b, respectively.
la, lb are terminal adapters, 2a, 2b are compound terminals, 3a, 3b are ISDN subscriber lines, 11a, I
lb is V12, which performs communication processing using the VI20 communication procedure.
0 communication processing section, 12a and 12b are LB function setting sections, 13
a, 13b are LB function confirmation processing units, 14a, 14b
15a and 15b are LB test data transmitting/receiving units, and 16a and 16b are call setting processing units.

Moreover, 17a to 19a, 17b to 19b are the above-mentioned L
In the respective parts constituting the B test data transmitting/receiving sections 15a and 15b, 17a and 17b are test data transmission processing sections, 18a and 1
8b is a test data return processing section, and 19a and 19b are test data reception processing sections.

Hereinafter, FIG. 2 will be explained assuming that the LB test is performed from the composite terminal 2a to the composite terminal 2b.

In FIG. 2, the compound terminal 2a is connected to the ISDN exchange 4 which does not have a PH via the terminal adapter 1a. An instruction to add the LB function is sent to the LB function setting section 12a. The L
When the instruction is input, the B function setting section 12a stores it as information for adding the LB function. It is assumed that the LB function is similarly set in the LB function setting section 12b in the terminal adapter 1b.

Next, a case where the compound terminal 2a executes the LB test with the compound terminal 2b will be described.

The compound terminal 2a first controls the LB function confirmation processing section 13a to mutually confirm the presence or absence of the LB function with the partner compound terminal 2b. The LB function confirmation processing unit 13a confirms from the LB function setting unit 12a that the LB function has been set for the own multifunction terminal 2a, and uses the function of the call setting processing unit 16a of the v120 communication processing unit 11 to configure the other multifunction terminal 2a. User information is exchanged with the terminal 2b. The call setting processing unit 16a processes a well-known procedure for controlling line connection via the ISDN exchange, and receives a call setting request signal 5ETUP from the calling side.
The call setup process begins by sending a signal and ends when a C0NN signal indicating that the called party has responded is sent back to the calling party. The 5ETUP signal and C0NN signal in the above are the control channel (
D channel), but by including information indicating the presence or absence of the LB function setting in the user information in the 5ETUP signal and the C0NN signal, it is possible to mutually check whether the partner multifunction terminal has the LB function or not. can be confirmed. Said LB function f! The authentication processing units 13a and 13b store the presence or absence of the LB function of the other party's multifunction terminal, which has been confirmed as described above.

Next, the compound terminal 2a controls the LBB test execution control unit 14a to execute the LB test. First, from the compound terminal 2a,
v120 communication processing unit 1 via the BB test execution control unit 14a
], LB information and test data indicating that it is necessary to loop back the data sent to the partner multifunction terminal to the test data transmission processing unit 17a in the LB test data transmission/reception unit 15a in a. Enter. At this time, LB
The B test execution control section 14a is connected to the LB function setting section 12a and the LB
It accesses the function confirmation processing section 13a, confirms that both the own multifunction terminal 2a and the other multifunction terminal 2b have LBli capability, and notifies the test data transmission processing section 17a. The test data transmission processing unit 17a adds the LB information and transmits the test data to the other party's multifunction terminal according to the communication procedure 120.

The structure of the test data will be explained below using FIG. 3. FIG. 3 (1) shows an example of a frame structure in the well-known HDLC (high-level data link control procedure). In the figure, Fl is a start flag, A is an address field, C is a control field, ■ is a data field,
Fe2 is an error detection information field, and F2 is an end flag. The test data is written in the data field (hereinafter referred to as I frame) mentioned above. Said■
A frame consists of a header part and a data part as shown in FIG. 3(1), and the LB information is set in the H part of the header part.

FIG. 3(2) shows the configuration of the H portion of the header portion of the T frame. The H part consists of 8 bits (1 octet) as shown in the figure, but bit numbers 4 and 5 are currently not specified in the CCITT recommendation, so
For example, bit number 4 is a bit indicating the LB information,
If the bit is 1, loopback is necessary; if the bit is 0, loopback is not necessary. As described above, the LB information can be set to any value by setting from the composite terminal 2a, but in cases other than LBB testing, it is always set to O, and loopback is not performed.

When the test data having the configuration shown in FIG. 3 is sent from the test data transmission processing unit 17a to the other party's terminal adapter 1b via the v120 communication procedure, The test data is input to the test data return processing section 18b.

The test data return processing unit 18b checks the bit content of the LB information, and if the bit is 1, the received test data is returned as is, but at this time, the LB information bit is returned as 0.

The return data is sent to the terminal adapter 1a on the sending side and received by the test data reception processing section 19a in the LB test data transmission/reception section 15a. The test data reception processing section 19a outputs the received return data to the multifunction terminal 2a via the LB test execution control section L4a. Composite terminal 2
At step a, the returned test data is compared with the sent test data to determine whether or not it was sent and received correctly.

FIG. 4 illustrates the procedure for transmitting and receiving the above test data. FIG. 4(1) shows a case where the LB information bit is turned on, that is, a case where loopback is required, and transmission and reception of test data is shown by thick lines. Figure 4 (1)
In the case of , test data input from compound terminal 1 is received by terminal adapter 2 via terminal adapter l, looped back by the LB test data transmitting/receiving section, and output to compound terminal l via terminal adapter l. . In addition,
During this time, when receiving data, the communication control protocol within the V120 communication processing unit indicates that the data has been received by
An RR multiplication signal is returned to inform the 120 communication processing section.

FIG. 4(2) shows an example in which loopback is not required; in this case, the received data is not sent back (but is output to the compound terminal 2).

In addition, in FIG. 2, the ISDN subscriber lines 3a and 3b are shown as multiple lines for convenience of explanation, but the ISDN subscriber lines 3a and 3b are each shown as multiple lines.
The DN subscriber lines 3a and 3b are a pair of digital lines on both the transmitting and receiving sides, and each has a well-known channel configuration.
That is, it has a 2B+D configuration.

As above, one embodiment of the present invention has been explained with reference to FIGS. 2 to 4, but each of the above figures merely shows one embodiment of the present invention, and the present invention can be understood by using configurations other than these figures. It is also possible to realize this.

In addition, in the above, the returned test data is output to the composite terminal 2a via the LBB test execution control unit 14a, and is compared with the transmitted test data in the composite terminal 2a. It is also easily possible to automatically perform the verification in the unit 14a and output only the verification result to the multifunction terminal 2a. The present invention does not exclude these structural variations.

〔Effect of the invention〕

As explained above, according to the present invention, a terminal connected to ISDNw4 that does not have a packet handler
It is now possible to add a loopback test function to the adapter, and the loopback test function allows the terminal and ISD
Since the normality of Nlil can be confirmed in real time, it greatly contributes to improving the reliability of such data communications.

FIG. 4 is a test data transmission/reception procedure diagram according to an embodiment of the present invention, and FIG. 5 is a connection diagram of the prior art.

In the figure, 1--1--・ 2---1... terminal adapter compound terminal TSDN subscriber line TSDN switch Communication processing unit Loopback function setting means Loopback function confirmation method Loopback test execution control means Loopback test data transmission/reception means It is.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention Test data frame configuration diagram in HDLC Loopback・Loopback when the bit is on ・When the bit is off Test data transmission/reception procedure of the embodiment of the present invention Figure 2] a Sae 1b

Claims (1)

[Claims] It has a communication processing unit (11), one end of which is a composite terminal (2),
The other end receives packets via the ISDN subscriber line (3).
A loopback test function is provided in the terminal adapter (1) connected to the ISDN exchange (4) without a handler to the communication processing unit (11) of the terminal adapter (1) under the control of the composite terminal (2). A loopback function setting means (12) that provides a
), when starting execution of a loopback test with the partner multifunction terminal, the presence or absence of loopback test function setting is input from the loopback function setting means (12), and the call setting process of the communication processing unit (11) is performed. a loopback function confirmation means (13) for mutually confirming the presence or absence of a loopback test function with a partner multifunction terminal via the multifunction terminal (16); and a terminal adapter (1) under the control of the multifunction terminal (2). A loopback test execution control means (14) that controls the execution of a loopback test in the communication processing section (
11), the test data with information indicating that loopback is required is sent to the partner multifunction terminal, and when the test data is returned from the partner multifunction terminal, the test data is used for the loopback test. Loopback test data transmitting/receiving means (15) for transmitting the test data to the multifunction terminal (2) via the execution control means (14) and returning the test data to the other multifunction terminal when the test data is received from the other multifunction terminal. A loopback test method characterized by: