JPS5919656B2 - Communication control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on DCE (Data Circuit Terminal).
The present invention relates to a communication control device with a built-in at-ing equipment simulator.

As is well known, the digital data exchange network (DDX network) of Nippon Telegraph and Telephone Public Corporation is open to some users.

Figure 1 shows an example of the configuration of a data exchange system using this DDX network, in which a central processing unit (CPU) 1 is connected to a DDX network 4 via a communication control unit 2 and a DCE 3.
A data terminal device (
DTE)T, 8 is connected. D
CE3, 5, and CE06 are communication control devices or interface devices that control signal conversion between the data terminal device and the DDX network. By the way, let's conduct a network connection operation test of the communication control device in the system configuration shown in Figure 1.
In this case, there was a problem that a connection test could not be performed without actually using the DDX network, and the line usage fees during that time could not be ignored.

In addition, since the communication control device itself cannot perform a network connection test, there is a problem in that when a fault occurs, it takes time to identify whether the fault is a network fault or a fault in the communication control device. The present invention has been made in view of the above circumstances, and is
By incorporating a CE simulator, it is possible to perform a DDX interface connection test on the communication control device itself without going through the DDX network. Hereinafter, the content of the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 2 is a block diagram of an embodiment of a communication control device according to the present invention.

In the figure, a communication control device 02 is connected to a central processing unit via a channel interface control section 11, and to communication lines L1, L2, etc. via a line control section 15, a line connection terminal 16, etc. DTE command control unit 12
It performs communication control between the central processing unit and the communication line under the control of the central processing unit. The present invention is characterized in that a DCE simulator control section 13 and a line mode storage register 14 are added to this communication control device. Here, the communication lines Ll and L2 indicate a part of the line group connected to the communication control device 2, and are usually connected to the line control unit 1.
The desired line is connected to the DTE command control section 12 under the control of the DTE command control section 5.

The DTE command control unit 12 starts a calling sequence, an incoming call sequence, and a disconnection sequence for the corresponding DCE 3 via the line control unit 15 and the selected line according to a command from the central processing unit, and It has a function to report completion to the central processing unit when these sequences are completed. DCE simulator control section 1
3 simulates a DDX network, and apparently the first
This corresponds to DCE3 in the figure. That is, the DCE simulator control section 13 is activated by a command from the central processing unit 1, and receives a call issued from the DTE command control section 12.
Upon receiving the incoming call and disconnection request, the DTE command control unit 12
It has a function to return a predetermined response to each request. The line mode storage register 14 is a register that receives and stores the mode of each line commanded from the central processing unit via the DTE command control section 12 or the DCE simulator control section 13. That is, the line mode storage register 14 indicates for each line connected to the communication control device 2 whether the line should be connected to the DTE command control unit 12 and controlled, or whether it should be connected to the DCE simulator control unit 13. It stores information that identifies what should be controlled. The line control unit 15 connects the line connected to the communication control device 2 to the DTE command control unit 12 or the DCE simulator control unit 13 according to the contents of the line mode storage register 14, and usually connects the specified line. Connect to the DTE command control unit 12 and
The path from command control unit 12 to communication line to DCE 3 is completed. Now, when testing the line connection operation, the central processing unit connects the communication line L1 connected to the line connection terminal 16 to the DT
Communication line L2 connected to the line connection terminal 17 to the E line
communication control device 2 to designate it as the DCE simulator line.
give commands to

The mode of each line instructed by the central processing unit is stored in the line mode storage register 14. Line control section 1
5 determines the output of the line mode storage register 14,
The communication line L1 is placed under the control of the DTE command control section 12, and the communication line L2 is placed under the control of the DCE simulator control section 13. Furthermore, the line connection terminals 16 and 17 are connected by a cable 18 in a loop. As a result, a path from DTE command control unit 12 to line control unit 15 to terminal 16 to cable 18 to terminal 17 to line control unit 15 to DCE simulator control unit 13 is established, and the DCE simulator control unit 13 is connected to the DCE simulator control unit 13 as shown in FIG. Assuming that this is the DCE3, we will now begin testing the operation of the DDX interface using the communication control device itself. Next, the line connection operation shown in FIG. 2 will be explained using the case of the calling sequence shown in FIG. 3 as an example.

First, the DTE command control section 12 issues a calling signal a, which is sent out from the line connection terminal 16 via the line control section 15. The calling signal a sent from the terminal 16 is received at the line connection terminal 17 via the cable 18 and transmitted to the DCE simulator control unit 13 via the line control unit 15. The DCE simulator control unit 13 receives the above calling signal a.
When it receives this, it outputs a selection signal sending enable signal b, which is also transmitted to the DTE command control unit 12 through the reverse path to that described above. When the DTE command control unit 12 receives the selection signal sending enable signal b, it changes the selection signal c to DC as before.
It is transmitted to the E-simulator control section 13. As a result, DC
The E-simulator control section 13 transmits the connection completion/communication enable signal d to the DTE command control section 12, and the calling sequence ends. That is, by the above procedure, the calling sequence operation can be confirmed within the same communication control device. Similarly, the operation of the incoming call sequence and the disconnection sequence can be checked within the same communication control device as the Kaede by the function of the DCE simulator control unit 13.

Furthermore, although the communication line L2 is used in the DCE mode here, it can be used as a normal DTE line if the line L2 is designated as the DTE mode. As explained above,
According to the present invention, since network connection operation tests can be performed using the communication control device itself without using the DDX network, line usage is reduced accordingly, and when a failure occurs, it is possible to determine whether it is a network failure or a failure of the communication control device. An effect useful as a cutting function can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a data exchange system using a DDX network, FIG. 2 is a diagram showing an embodiment of the communication control device of the present invention, and FIG. 3 is for explaining the operation of FIG. 2. This is a diagram. 1... Central processing unit, 2... Communication control device, 3, 5
, 6...DDX network interface device, 4...D
DX network, 7, 8...terminal device, 11...channel
Interface control unit, 12...DTE command control unit, 13...DCE simulator control unit, 14...
Line mode storage register, 15... line control unit, 16
, 17... Line connection terminal, 18... Loop cable.

Claims (1)

[Claims] 1 Connected to a digital data exchange network (DDX network) via a circuit terminating equipment (DCE), and equipped with a main control unit for exchanging a calling sequence, an incoming call sequence, a disconnection sequence, etc. with the DCE. A communication control device comprising a built-in simulator (DCE simulator) that simulates the DCE separately from the main control section, and a line of the communication control device to which the DCE is connected between the main control section and the DCE simulator. A communication control device, which is connected in a loop through a connection terminal, and performs operation tests such as a call origination sequence, a call reception sequence, or a disconnection sequence, while apparently regarding the DCE simulator as a DCE.