JPH02278956A - Monitoring system utilizing public line network - Google Patents

Abstract

PURPOSE:To surely detect a data fault or the detection of the disconnection of public line by using a monitoring section and a processing section in the memory state and communication state to monitor and confirm the presence of the fault data and the communication state from a terminal equipment side. CONSTITUTION:A data sent from a terminal equipment is stored in a memory section 13 and a data stored corresponding to a polling from a branching device 16 is sent from a host communication processing section 15 to a host CPU 17. In this case, a monitoring section and processing section 20 for the memory state and the communication state monitor the fault data from the terminal equipment side and the presence of the execution of the normal communication. Moreover, the control section 14 and a transmission reception data processing section 10 have a function communicating with other buffer device and and when the function is enabled of communication, it is discriminated that the line is normal. Thus, in the presence of a fault data, it is detected and the disconnection of the public line is detected.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a monitoring system using a public line network.
In particular, it relates to detection of disconnection of the public line on the center equipment side.

(Prior Art) Conventionally, as technologies in this field, there have been the following, for example.

FIG. 2 is a block diagram of a communication system using such a conventional public line network.

As shown in this figure, this communication system consists of public line 1
, a network control unit (NCU) to which this public line is connected2.
16Hz detection section 3, changeover switch 4, relay contact 5,
6, transformer 7, amplifiers 8, 9, transmitting/receiving data processing section l
O, relay drive section LL relay 12, memory section 13, control section 14, upper communication processing section 15゜18, branching device 16,
It is composed of the upper CPU 17.

(Intelligence Problem to be Solved by the Invention) However, in the above-mentioned communication system using the conventional public line network, it is difficult to detect a disconnection of the public line.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and to provide a monitoring system using a public line network that can easily detect a disconnection of a public line systematically.

(Means for solving !m1ll) According to the present invention, in order to achieve the above object, a monitoring system using a public line network includes a network control device for multiple lines and is installed on the terminal side. a means for communicating with a device that has been connected, a means for storing data sent from the terminal side through the communication, a means for periodically importing the stored data, and the presence or absence of failure data from the terminal side and the communication status. and a means for calling and communicating with other lines of the network control device at certain fixed time intervals.

(Operation) According to the present invention, the monitoring unit/processing unit (20) monitors the memory status and communication status of data transmitted from the terminal side, and checks whether there is any communication failure data from the terminal side. Data failure or disconnection of the public line is detected by checking whether or not this is occurring.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a monitoring system using a public line network, showing an embodiment of the present invention.

First, the monitoring system using the public line network of the present invention is
The conventional system shown in FIG. 2 is further configured to include a memory status and communication status monitoring/processing unit 20.

In addition, since the numbers attached to each component in FIG. 1 are the same as those of the conventional one, the explanation thereof will be omitted.

The operation of the monitoring system using this public line network will be explained below.

In this system, a network control 21 device (automatic NCU) 2 that can communicate with multiple public lines 1 is provided to communicate with devices installed on the terminal side. Data transmitted from the terminal side is stored in the memory section 13.

Furthermore, in response to polling from the branching device 16, the H-product data is transmitted from the higher-level communication processing section 15 to the higher-level CPU 17. Here, the upper communication processing section 15 and the control section 14
requests the telephone number of the destination to be called from the host CPU'17, and the control section 14 and relay drive section 11 make a call to the telephone number obtained therefrom.

In this case, in the present invention, the memory status and communication status monitoring unit/processing unit 20 monitors whether there is any failure data from the terminal side and whether normal communication is being performed.

Further, the control section 14 and the transmission/reception data processing section 10 have a function of communicating with other buffer devices, and if communication is possible with these devices, it is determined that the line is normal.

Based on this determination, the control unit 14, higher-level communication processing unit 15, and higher-level C-J'U 17 can transmit a message to that effect.

As described above, in the present invention, the memory status and communication status monitoring unit/processing unit 20 checks whether there is fault data from the terminal side, and detects the fault data if there is fault data from the terminal side. can do.

Furthermore, by checking whether normal communication is occurring, it is possible to detect a disconnection of the public line.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, the presence or absence of failure data from the terminal side and the communication status are monitored and confirmed by the memory status and communication status monitoring unit/processing unit. By doing so, it is possible to accurately detect a data failure or a disconnection of a public line.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a monitoring system using a public line network showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional communication system using a public line network. ■...Public line, 2...Network control unit (NCU), 3
...16Hz detection section, 4...Selector switch, 5, 6
°゛°Relay contact, 7...Transformer, 8.9...
Amplifier, 10... Transmission/reception data processing section, 11... Relay drive section, 12... Relay, 13... Memory section,
14...Control unit, 15.18...Upper communication processing unit,
16...Branch device, 17...Upper CPU, 20...
- Monitoring unit and processing unit for memory status and communication status. Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Scope of Claims] (a) means for communicating with a device installed on the terminal side having a network control device for multiple lines; and (b) storing data sent from the terminal side through the communication. (c) means for periodically importing the accumulated data; (d) means for monitoring the presence or absence of fault data from the terminal side and the communication status; (e) means for monitoring the communication status at certain regular intervals; What is claimed is: 1. A monitoring system using a public line network, characterized by comprising means for calling and communicating with a control device on another line.