JPS59211372A - Network controller - Google Patents

Abstract

PURPOSE:To attain ease of confirmation of operation by providing a circuit supervising a selecting signal to an output side of a selecting signal transmission section. CONSTITUTION:A network controller 8 comprises a selecting signal transmission section 2 connected to a telephone line 1, an interface section 5 to which a signal line 4 from an external communication control section 3 is connected, a selecting signal supervising circuit 6 connected to the output side of the selecting signal transmission section 2 and a control section 7. The control section 7 controls the selecting signal transmission section 2 by telephone number information transmitted via the interface section 5 from the communication control section 3 and transmits a selecting signal to the telephone line 1. The supervising circuit 6 monitors the selecting signal and transmits it to the control section 7. The control section 7 confirms whether or not the monitored number is identical to the telephone number command to the selection signal transmission section 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a network control device, and more particularly to an automatic transmission type network control device for telephone lines.

Conventionally, in a telephone circuit network control device, a selection signal is sent from a selection signal sending unit to a p telephone line based on telephone number information received by appropriate means from a communication control device connected to the device. However, since it is not possible to confirm whether or not the correct selection signal is being sent, it is difficult to determine which part of the communication system is at fault during normal operation.

The present invention solves the above drawbacks by adding a selection signal monitoring circuit, and provides a network control device that can be expected to operate reliably.

According to the present invention, there is obtained a network control device characterized in that it includes a switch selection signal monitoring circuit for monitoring the selection signal on the output side of the number information from the communication control device. will be explained with reference to the drawings.

FIG. 1 shows a block diagram of a first embodiment of the present invention. Referring to FIG. an interface unit 5 to which a signal line 4 from an external communication control unit 3 of the network control device 8 is connected;
The selection signal monitoring group IRT 6 is connected to the output side of the selection signal transmitting section 2, and a control section 7 that controls them.

Next, the operation will be explained. Based on the telephone number information transmitted from the communication control unit 3 via the interface unit 5,
The control section 71d controls the selection signal sending section 2 and sends out a selection signal to the telephone line l. The monitoring circuit 6 monitors the selection signal sent to the telephone line 1 and transmits it to the control section 7.

The control section 7 checks whether the received number is the same as the telephone number instructed to the selection signal sending section 2. f] If these data do not match for some reason, it is determined that there is an abnormality in the device. For this reason, it can be confirmed that the telephone number received from the communication control section 3 is being operated as expected.

FIG. 2 shows a block diagram of a second embodiment of the invention. In this embodiment, the output of the selection signal monitoring circuit 6 is controlled by the control s7.
Instead, it is input to the display section 9. For this reason, the selection signal output from the selection signal sending section 2 is displayed on the display section 9, making the operating state clear.

As explained above, the present invention has the advantage of being able to reliably confirm all operations in a network control device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, and FIG. 2 is a block diagram of a second embodiment of the present invention. 1... To telephone line, 2... Selection signal sending section, 3... Communication control device, 4... Signal line, 5...・Interface section, 6...
Selection signal monitoring circuit, 7...control section, 8...
. . . Network control device, 9 . . . Display unit. Agent Patent Attorney Fu Uchihara

Claims (1)

[Claims] A network control device having a selection signal sending section that sends a selection signal to a dirty communication line based on number information from a communication control device, including a selection signal monitoring circuit that monitors the selection signal on the output side of the selection signal sending section. A network control device characterized by: