JPS643385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test method for a line control device having a network control function for connecting to a line-switched network and controlling connection and disconnection functions of the line-switched network.

FIG. 1 shows an example of the configuration of a data communication system using a line-switched network. According to this figure, the center side is composed of a processing device 1, a line control device 2, and a line termination device 3, and the terminal side is composed of a processing device 1, a line control device 2, and a line termination device 3. It consists of a line termination device 3 and a terminal device 6 (or system 7), each of which is interconnected to an exchange 4 via a line 5. When performing data communication with the above configuration
An example of the operation of the line control device in the X21 interface will be outlined with reference to FIG.

In the figure, 10 is the T line (transmission line), 11 is the C line (control line), 12 is the R line (reception line), and 13 is the I line.
line indicator line), 14 is a selection signal sending enable signal,
15 is a selection signal, 16 is a call signal, 17 is an ID signal, 18 is transmission data, 19 is a recovery request, 20 is a disconnection instruction, and 21 is a circuit switched network.

First, when connecting by calling, processing device 1
A selection signal transmission command is issued to the line control device 2. The line control device 2 controls the T line 1 according to the command.
It controls the 0 and C lines 11 to make a call, and monitors the selection signal transmission enable signal 14 on the R line 12 that is responded to from the exchange network. Upon receiving the signal 14, the selection signal 1
Send 5. Then, the other party is called by the selection signal 15. Thereafter, the ID signal 17 of the terminal device to be connected is sent from the network to the R line 12, and communication is enabled by turning on the I line 13. From then on, data transmission and reception with the connected terminal becomes possible. Further, when connecting due to an incoming call, the processing device 1 normally issues an incoming call acceptance command to the line control device 2. During the command, the line control device 2 monitors the call signal 16 from the network. When receiving the signal 16, it controls the C line 11 to respond. Thereafter, the ID signal 17 of the terminal device that is the calling party is sent from the network to the R line, and communication is enabled by turning on the I line 13, so that data can be sent and received from now on. After data transmission and reception are completed, a disconnection command is issued from the processing device 1 to the line control device 2. The line control device 2 controls the T line 10 and the C line 11 in accordance with the command and issues a restoration request 19. In response to the recovery request 19, a disconnection instruction 20 is notified to the other party's terminal. Then, mutual recovery confirmation is obtained and the disconnection control is completed.

The above is an outline of the operation of the line control device 2 in the line switching network, including the network control function.

Here, a self-test of the line control device 2 equipped with the network control function will be explained.

In order to test the network control function, circuit switching network connection and disconnection functions are required. One possible test method would be to first install a circuit-switched network. However, this method is not economically advantageous, and even if it is installed, connecting and testing untested equipment will increase the number of testing steps.

The next method would be to use some kind of test equipment that has the function of connecting and disconnecting a circuit switched network.

However, this method also has problems, such as the development and installation of testing equipment, which makes it uneconomical.

Therefore, an object of the present invention is to enable an operation test of the entire line control device including a test of the network control function without installing a special test machine. A line control device connected to a circuit switching network and equipped with a network control means for exchanging predetermined signals with the circuit switching network to control connection and disconnection functions of the circuit switching network. network connection means that connects one of the plurality of housed line control circuits back to another line control circuit and simulates the exchange of the predetermined signals on the line switching network side according to a command from a processing device; The network control means and the network connection means are made to correspond to each other via the loop-connected line control circuit, and the predetermined signals are exchanged. The present invention will be explained below with reference to the drawings.

FIG. 3 is a block diagram showing a test method for a line control device according to an embodiment of the present invention, in which 1 is a processing device, 2 is a line control device, 30 is a network control function unit, and 31 is a data transmission/reception control unit. 32 is a network connection section, 33 is a network connection section command line, 34 and 34' are line control circuits, and 35 is a return signal line.

In FIG. 3, the functions added according to the present invention are a network connection section 32 and a network connection section command line 33.

Figure 4 shows the connection of signal lines when one line control circuit according to the present invention is looped back to the other line control circuit, and can operate no matter which side becomes the pseudo side of the line switching network. . The operation of FIG. 3 is as follows.

First, a selection signal reception command is issued from the processing device 1 to an arbitrary line (here, 0 line) of the line control device 2 via the network connection section command line 33. At this time, the line control circuit 34 becomes a pseudo-exchange side. The network connection unit 32 monitors the calling operation from the other party's line control circuit via the line control circuit 34. Next, a selection signal transmission command and an ID signal reception command are transmitted from the processing device 1 to an arbitrary line (in this case, the n line) of the line control device 2 through a chain of commands. The network control function section 30 includes the line control circuit 3
4' to perform the calling operation. At this time, the signal sent from the line control circuit 34' to the signal line 35 is detected by the network connection section 32 via the line control circuit 34 (selection signal receiving side). When the network connection unit 32 detects a call via the signal line 35 and the line control circuit 34, it sends the selection signal sending enable signal 14 to the signal line 35 via the line control circuit 34, and the selection signal 15 is transmitted to the signal line 35 and the line. It waits for it to be sent via the control circuit 34. The network control function unit 30 transmits the selection signal sending enable signal 14 to a signal line 35 and a line control circuit 34'.
The selection signal 15 is transmitted to the signal line 35 via the line control circuit 34'.
When the transmission operation is completed, the selection signal transmission command is completed, a command is chained to the ID signal reception command, and the ID signal 17 from the signal line 35 is monitored via the line control circuit 34'. On the other hand, selection signal 15
is received by the network connection unit 32 via the line control circuit 34 and transferred to the processing device 1. The processing device 1 compares the selection signal sent to the line control device 2 with the selection signal transferred from the line control device 2, and confirms the operation of the line control device 2. Further, an ID signal transmission command is issued to the network connection unit 32 of the line control device 2 via the command line 33. The network connection unit 32 connects the signal line 3 via the line control circuit 34.
Send ID signal 17 to 5, and after transmission is completed, I line 1
Turn on 3 to display that communication is possible and end the command.
On the other hand, the network control function section 30 transfers the ID signal received via the line control circuit 34' to the processing device 1, and when it detects that communication is possible, the ID signal reception command ends.
The processing device 1 compares the ID signal transmitted to the line control device 2 with the ID signal transferred from the line control device 2, and confirms the operation of the line control device 2. Thereafter, a data transmission/reception command is issued from the processing device 1 to the data transmission/reception control unit 31 of the line control device 2, data is transmitted and received between the 0 line and the n line, and the processing device 1 controls the operation of the line control device 2. It is confirmed. Furthermore, detailed tests can be performed by adding the calling signal format or service signal format to the contents of the transmission data in the ID signal transmission command.

Further, in the case of an incoming call, an incoming call acceptance command is issued from the processing device 1 to an arbitrary line (here, line 0) of the line control device 2. Thereafter, a paging signal transmission command and the above-mentioned ID signal transmission command are transmitted from the processing device 1 to an arbitrary line (in this case, n line) of the line control device 2, and the communication between the network control function unit 30 and the network connection unit 32 is transmitted. It is possible to check the operation from the processing device 1 based on the transmitted and received call signal, ID signal, etc.
Furthermore, the operation of the disconnection control function of the network control function section 30 can be checked from the processing device 1 due to the correspondence between the network control function section and the network connection section.
However, detailed explanation will be omitted.

As explained above, according to the present invention, in the self-test of a line control device equipped with a network control function, the connection and disconnection functions of a line switching network can be performed by commands from the host processing device without installing a test machine or the like. By sending and receiving and transferring selection signals, ID signals, etc. in the same way as general data, it is easy to test the operation of the entire line control device, including the line control circuit, network control function section, and data transmission/reception control section. I can do it.

It goes without saying that similar operation tests can be performed on the X20 interface as well.

[Brief explanation of drawings]

Fig. 1 shows an example of the configuration of a data communication system using a line-switched network, Fig. 2 shows an example of the operation of a line control device in an X21 interface, and Fig. 3 shows a test method for a line control device according to an embodiment of the present invention. The block diagram shown in FIG. 4 is a diagram showing connections of signal lines when one line control circuit is looped back to another line control circuit according to the present invention. In FIG. 3, 1 is a processing device, 2 is a line control device, 30 is a network control function section, 31 is a data transmission/reception control section, 32 is a network connection section, 33 is a network connection section command line, and 34 and 34' are lines. In the control circuit, 35 is a folded signal line.

Claims (1)

[Scope of Claims] 1. A line control device that is connected to a line-switched network and includes network control means for exchanging predetermined signals with the line-switched network to control connection and disconnection functions of the line-switched network. , connecting one of the plurality of line control circuits housed in the line control device to another line control circuit, and controlling the exchange of the predetermined signals on the line switching network side according to a command from the processing device. A line characterized in that a simulated network connection means is provided, the network control means and the network connection means are made to correspond to each other via the loop-connected line control circuit, and the predetermined signals are exchanged. Control device test method.