JPH0482340A - Terminal test equipment for isdn - Google Patents

Abstract

PURPOSE:To easily measure an information channel of a terminal equipment by utilizing a communication condition negotiated through a protocol while processing the protocol stipulated by the CCITT recommendations Q,900 series so as to set a measurement condition to a measurement section. CONSTITUTION:A changeover circuit 4 of a test equipment 10 connects a channel designated by a protocol control section 2 among information channels separated by a transmission reception circuit 1 to a measurement section 4. In the case of communication between a terminal equipment 11 and the test equipment 10 through the use of an information channel on a user-network interface 21, a virtual terminal section 3 sends the communication condition and a communication start timing signal to a measurement control section 6. Upon the receipt of the communication condition, the measurement control section 6 converts the condition into the measurement condition and sends the result to a measurement section 5, and upon the receipt of the communication start timing signal, the measurement control section 6 converts it into a measurement start timing signal and sends the result to the measurement section 5 to start the measurement of the information channel. After the receipt of the result of measurement from the measurement control section 6, the virtual terminal equipment section 3 sends an interrupt message to the protocol control section 2 to execute the interrupt restoration procedure to the terminal equipment 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] This invention is based on CCITT Recommendation I. 430 or 1°43
I that connects to the user-network interface specified in 1.
This is a test device for SDN terminals (hereinafter simply referred to as terminals) to check whether information is correctly transmitted through the terminal's information channel.

"Prior Art" Next, the connection between the network and the terminal will be explained with reference to FIG.

In FIG. 3, 11 and 12 are terminals, 21 and 22 are user/network interfaces, 31 and 32 are network termination devices, 33 and 34 are subscriber lines, and 35 is an exchange.

30 surrounded by a dotted line in FIG. 3 is called 15DNI.

In FIG. 3, terminals 11 and 12 are connected to user/network interfaces 21 and 22, network termination devices 31 and 32, and subscriber lines 33 and 3.
4 is a state diagram connected to the exchange 35 via the switch 35.

The user/network interfaces 21 and 22 have one D channel and multiple information channels, and the types of information channels include 64k depending on the information transfer rate per channel.
B channel at b/s and H at 384k b/s.

channel and 1536k b/s Hl, Chao,
There is a 1920 kb/s H1 channel.

The D channel is called a signal channel and is used to transfer control information for connecting and disconnecting information channels.

Between the terminal 11 and the exchange 35, and between the terminal 12 and the exchange 35, there is a protocol on the D channel according to the CCITT Recommendation Q, 900 series, whereby an information channel is connected between the terminals 11 and 12.

In other words, when the terminal 11 attempts to connect the information channel with the terminal 12, the terminal 11 sends the message to the exchange 35,
According to the protocol on the D channel, a call setup message containing the destination address of the user/network interface 22 to which the terminal 12 is connected and the communication conditions on the information channel is transmitted, and the message is sent from the exchange 35 to the user/network interface 21. receive permission to use information channels. Switchboard 3
5 transfers the communication conditions on the information channel received from the terminal 21 to the terminal 22 in a call setup message, and
Waits for a response from 2 asking whether to accept the communication. Terminal 2
2 returns a response message to the exchange 35 if communication is possible under the received communication conditions. When the exchange 35 receives the response message from the terminal 22, it transfers it to the terminal 21. By receiving the response message from the exchange 35, the terminal 21 knows that the information channel to the terminal 22 has been connected, and can start communication.

Next, a conventional configuration for testing whether the information channel of a terminal operates correctly will be explained with reference to FIG. Figure 4 shows CCITT Recommendation I, 430 or I. The transmitter/receiver circuit 1 that communicates with the user/network interface 21 specified in 431, and the protocol control unit 2 that processes protocols in accordance with the CCITT Recommendation Q and 900 series specifications, transmits information to the terminal. When the terminal performs an incoming call operation and the terminal performs an outgoing operation, the virtual terminal unit 3 acts as the other party and processes the call, and in order to perform measurement from a plurality of information channels, an information channel is selected and connected to an interface 51 with a measuring device. It is composed of a switching circuit 4 that allows

Next, the connection between the terminal and the measuring device in the conventional configuration will be explained with reference to FIG. To test the information channel of the terminal in FIG. 5, the tester 40 sends a call to the terminal 11, causing the terminal to perform an incoming call operation, and when the terminal 11 makes an outgoing call, the terminal becomes the other party. The information channel of the terminal 11 is connected to the measuring device 60, and measurement is performed under conditions that match the communication conditions specified by the protocol on the D channel. What should be noted here is that when operating the measuring device 60, the measuring device must be set after knowing in advance under what conditions the terminal will communicate.

Setting up the measuring device is relatively easy if the terminal has only a single function, such as a telephone function, but if the terminal is a terminal adapter that can communicate under multiple communication conditions, it is difficult to set up the measuring device. Settings become complicated.

[Problems to be Solved by the Invention] In the conventional configuration as shown in Fig. 4, it is necessary to know the communication conditions of the information channel in advance and then set the measurement conditions of the measuring instrument. There is a problem in that the more types of communication conditions there are, the more complicated it becomes to set measurement conditions.

The present invention processes the protocols specified in CCITT Recommendation Q, 900 series, sets measurement conditions for the measurement unit using communication conditions negotiated through the protocol, and facilitates the information channel of the terminal. The purpose is to measure.

[Means for Solving the Problem] In order to achieve this object, the present invention uses CCITT
Kansei I. 430 or I. A tester connected as the network side of the interface 21 defined in C.431,
CITT Recommendation I. 430 or I.

・Control framing, assembly and separation of D channels and information channels in accordance with the provisions of CCITT Recommendation I
．． 430 or I. 431, the transmitter/receiver circuit 1 that communicates with the network interface 21, and the CC
The protocol controller 2 processes the protocol in accordance with the specifications of ITT Recommendation Q, 900 series, and controls the connection and disconnection of information channels. A terminal section 3 serves as the other party when an outgoing operation is made, and a switching circuit takes out a designated channel from the protocol control section 2 among the information channels separated by the sending/receiving circuit 1. , the measuring section 5 receives the output of the switching circuit 4 (input)j, and receives the measurement conditions and the communication start timing signal from the terminal section 3, and transmits the measurement conditions and the measurement start timing signal to the measuring section 5. and a measurement control section 6 that transmits the measurement results of the measurement section 5 to the virtual terminal section 3.

Next, the connection between the tester and the terminal according to the present invention will be explained with reference to FIG.

10 in Figure 2 is a tester, and the others are terminals 1 in Figure 3.
1. It is the same as the user/network interface 21.

The tester 10 is connected to the user/network interface 21 in the same way as the network termination device 31 of FIG.

Next, a configuration diagram of an embodiment of the tester 10 will be explained with reference to FIG. 5 in FIG. 1 is a measurement section 5. 6 is a measurement control section,
Other details are the same as in Figure 4.

The transmitter/receiver circuit 1 is constructed according to CCITT recommendations so as to be able to communicate with the user/network interface 21.

430 or I. This is a part that controls framing, D channel, information channel assembly and separation, etc. in accordance with the provisions of 431.

The protocol control unit 2 complies with C, CI TT Recommendation Q.

This is a part that processes protocols according to the 900 series regulations. Furthermore, the protocol control unit 2 has a function of controlling a switching circuit 4 that switches information channels.

The virtual terminal unit 3 performs processing to cause the terminal to be tested to perform an incoming call operation by making a call to the terminal to be tested, and to become the other party when the terminal to be tested makes an outgoing call operation. It also has a function of transmitting information channel communication conditions and a measurement start timing signal to the measurement control unit 6.

The switching circuit 4 also has the function of connecting the channel designated by the protocol control section 2 to the measurement section 4 among the information channels separated by the transmission/reception circuit 1.The measurement section 5 receives and receives from the measurement control section 6. It has a function of transmitting the measurement results back to the measurement control unit 6 after measuring the information channel according to the measurement conditions and measurement start timing signal.

The measurement control unit 6 converts the communication conditions of the information channel received from the virtual terminal unit 3 into measurement conditions for setting the measurement unit and sends it to the measurement unit 5, and after receiving the communication start timing signal from the virtual terminal unit 3. , has a function of transmitting a measurement start timing signal to the measuring section 5.

Next, the connection between a tester and a terminal according to another embodiment of the present invention will be explained with reference to FIG.

The tester 7o is connected to the user/network interface 21 in the same way as the tester 10 in FIG.

The measuring device 60 has the same function as the measuring section 5 in FIG.

The controller 80 has the same functions as the measurement control section 6 in FIG.
0, the measuring device 60 via the measurement control interface 53
connected to.

Therefore, the tester 70, measurement interface 51, virtual terminal interface 52, measurement control interface 53, measuring instrument 60, and controller 80 in FIG.
Together, it has the same functions as the tester 10 shown in FIG.

FIG. 6 is a block diagram of an embodiment of the tester 70 according to FIG. The tester 70 includes the measuring section 5 from the tester 10 in FIG.
This corresponds to the configuration obtained by removing the measurement control unit 6 and adding a measurement interface 51 and a virtual terminal interface 52.

[Effect] Next, the operation of FIG. 1 will be explained.

In CCITT Recommendation Q, 900 series, when a terminal starts communication, it sends the communication conditions for using an information channel to the network in a call setup message, and the network sends the communication conditions to the terminal when it starts communication. It is specified that the message is sent to the terminal in a call setup message, and between the terminal that made the call and the terminal that accepted the call, and in other words, the communication between the terminal 11 to be tested and the virtual terminal section 3. When communication conditions are agreed upon, communication can occur through the information channel.

Therefore, when the terminal 11 and the tester 10 communicate using the information channel on the user/network interface, the virtual terminal section 3 can transmit the communication conditions of the information channel and the communication start timing signal to the measurement control section 6. can.

When the measurement control unit 6 receives the communication conditions from the virtual terminal unit 3, it converts them into measurement conditions and transmits them to the measurement unit 5, and then:
When a communication start timing signal is received from the virtual terminal section 3, it is converted into a measurement start timing signal and transmitted to the measurement section 5, thereby starting measurement of the information channel.

Next, the operation of ending the measurement will be explained.

There are three ways to end the measurement:

In the first method, the virtual terminal unit 3 gives the measurement control unit 6 a measurement time in advance, and after the measurement time has elapsed, the measurement control unit 6 reads the measurement result from the measurement unit 5 and transfers it to the virtual terminal unit 3.
This is the way to send it to. After receiving the measurement results from the measurement control unit 6, the virtual terminal unit 3 transmits a disconnection message to the protocol control unit 2, and executes a disconnection recovery procedure on the terminal 11 according to the CCITT Recommendation Q, 900 series protocol. .

The second method is to not specify the measurement time from the virtual terminal unit 3,
Or, before the specified measurement time elapses, the virtual terminal unit 3
In this method, a measurement end signal is sent to the measurement control unit 6 from the measurement unit 5, and the measurement result at that time is read from the measurement unit 5. After receiving the measurement results from the measurement control unit 6, the virtual terminal unit 3 transmits a disconnection message to the protocol control unit 2, and
Recommendation Q.

A disconnection recovery procedure according to the 900 series protocol is executed for the terminal 11.

The third method is to not specify the measurement time from the virtual terminal unit 3,
Alternatively, before the specified measurement time elapses, the terminal 11 sends a disconnection message to the tester 10, and a disconnection recovery procedure according to the CCITT Recommendation Q, 900 series protocol is executed for the test 10. The protocol control unit 2 transfers the disconnection message received from the terminal 11 to the virtual terminal unit 3. When the virtual terminal unit 3 receives the disconnection message from the protocol control unit 2, the virtual terminal unit 3 transmits the disconnection message to the measurement control unit 6.
The measurement end signal is sent to the measurement side, and the measurement result read from the measurement unit 5 is sent to the measurement side. # Receive from section 6.

Using any of the above three methods, the virtual terminal section 3 obtains the measurement results and then displays or outputs them to the outside.

This control allows the tester 10 to perform measurements under measurement conditions that match the communication conditions of the information channel of the terminal 11.

[Effects of the Invention] According to this invention, when measuring the information channel of a terminal connected to an ISDN user/network interface, the tester operator can measure the information channel of a terminal connected to an ISDN user/network interface without knowing the communication conditions of the terminal being tested. , measurements can be performed.

[Brief explanation of drawings]

1 is a block diagram of an embodiment of the tester 10 shown in FIG. 2, FIG. 2 is a connection diagram between the tester 10 according to the present invention and a terminal, FIG. 3 is a connection diagram between a network and a terminal, and FIG. 4 is a conventional technique. FIG. 5 is a diagram showing the connection between a tester and a terminal according to the prior art, FIG. 6 is a diagram showing the configuration of another embodiment of the present invention, and FIG. It is a connection diagram of a terminal. 1...Transmission/reception circuit, 2...Protocol control section, 3...Virtual terminal section, 4...Switching circuit, 5...Sub. Chamber, 6...Measurement control section, 10...Testing device, 11/12...
...Terminal, 21/22...User/network interface, 30...15DN network, 31/32...
...Network termination equipment, 33, 34...Subscriber line, 35...Switching equipment, 4o...Test device, 51...Measurement interface , 52...
...Virtual terminal interface, 53...Measurement control interface, 60...Measuring instrument, 7o...
...Testing device, 80...Controller representative Patent attorney Kinji Komata】0 Testing device 9 Testing device

Claims (1)

[Claims] 1. CCITT Recommendation I. 430 or I. A tester that is connected as the network side of the interface (21) specified in CCITT Recommendation I.431. 430 or I. Controls framing, assembly and separation of D channels and information channels in accordance with the provisions of CCITT Recommendation I.431. 430 or I.
User-network interface (21) specified in 431
A transmitter/receiver circuit (1) that communicates with CCITT Recommendation Q. A protocol control unit (2) that processes protocols in accordance with the 900 series regulations and controls the connection and disconnection of information channels; A virtual terminal unit (3) acts as the other party when processing a message, and a switching circuit (3) takes out a designated channel from the protocol control unit (2) among the information channels separated by the transmitting/receiving circuit (1). 4), a measurement unit (5) which receives the output of the switching circuit (4) as input, and a virtual terminal unit (3) that receives measurement conditions and a communication start timing signal and transmits the measurement conditions to the measurement unit (5). and a measurement control section (6) that transmits a measurement start timing signal and transmits the measurement result of the measurement section (5) to the virtual terminal section (3).