JPH0137054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic line monitoring system for automatically monitoring a communication line connecting a central station and a peripheral station when the same data is sent from the central station and the peripheral station.

Conventionally, this type of line monitoring system manually transmits a test signal from the central station, and when the test signal is decoded by the peripheral station, the result is sent to the central station and a normal display is displayed on the monitoring device at the central station. transmitting a test signal from the transmitters of the central station and peripheral stations at predetermined time intervals, and receiving this test signal by the test receivers located at the central station and peripheral stations. At the time, peripheral stations sent this information to the central station, and the central station's monitoring equipment displayed it centrally. However, manual testing has the drawbacks of placing a burden on the supervisor who monitors the monitoring equipment at the central station and lengthening the monitoring time, and even in the case of automatic monitoring, this display does not indicate the normal state. As a result, this display item on the monitoring device is always occupied, resulting in a disadvantage that monitoring efficiency deteriorates.

Therefore, an object of the present invention is to provide a line monitoring system in which a determination function is added to peripheral stations and a display signal is sent to the central station only in the case of an abnormality, thereby facilitating monitoring at the central station. .

According to the present invention, before transmitting a test signal, a test start signal is sent through a signal line to a plurality of transmitting devices in the central station and peripheral stations, and a line test receiver provided in the transmitting device performs a test. Declare the start of. Next, a test signal is emitted, and when the test signal is successfully received by the test receiver, the signal is not sent to the central station monitoring device, and only when the test signal cannot be received within a certain period of time after the test start declaration. , the line abnormality will be displayed to the monitoring device. For this reason,
The line test receiver of each transmitting device is provided with a judgment function. The present invention enables automatic monitoring of communication lines including transmitter output.

In the line monitoring system according to the present invention, a test start signal is transmitted from the encoding device at predetermined time intervals, and at the same time, a test start signal is transmitted to the wireless paging device.
Sends a trigger signal to transmit an arbitrarily set test signal. The radio paging device that receives the trigger signal sends out a test signal, stores it in the memory of the encoding device, converts it into a digital code like normal transmission data, and sends it out via a communication line to multiple transmitting devices. It is emitted as a radio wave. If the line test receiver installed in each transmitting device receives the transmitted radio wave within a certain time after receiving the test start signal via the line and decodes the test signal, it is considered normal. If it cannot be received, it is determined that there is an abnormality, and
Lines are automatically monitored by displaying abnormal signals on a monitoring device installed at the central office.

Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention. The drawings are diagrams showing one embodiment of the present invention, and will be explained using a pager transmission system as an example. In the figure, central station 1 and two peripheral stations 2
and a wired circuit 3 connecting these. Inside the central office 1 is a radio paging device 11 that receives the pager identification number sent from the toll exchange, performs number verification, etc., and generates a test signal, and converts the pager identification signal from the radio paging device 11 into a digital code. In addition, in the present invention, there is an encoding device 12 that generates a test start signal that is sent out prior to the test signal, and a transmission of a pager identification signal, a test start signal, a test signal, etc. sent from the encoding device 12. Line connection device 1 that distributes data to the transmitting devices 4 of the central station 1 and peripheral stations 2
3, a monitoring device 14 that displays circuit monitoring signals sent back from each transmitting device, and the aforementioned transmitting device 4.

To explain the transmitting device 4, first, the transmitted data sent from the line connection device 13 is sent to the transmitter 42 via a phase compensator 41 so that the phases of the transmitted data from the central station 1 and peripheral stations 2 are equal. from there via the antenna 43.
A line test receiver 44 is also provided, which detects a test start signal and a test signal to determine whether the line is functioning normally, and sends the results to the central station.
sent to the monitoring device.

Next, we will explain the operation. The encoding device 12 transmits a test start signal at 10 minute intervals and distributes it to each transmitting device 4 via the line connection device 13. Furthermore, at the same time as the test start signal is sent, the trigger signal 10 is sent from the encoding device 12 to the radio paging device 11. When the radio paging device 11 receives the trigger signal 10, it transmits a preset test signal (for example, 1111), digitizes it in the encoding device 12, and transmits it from the transmitter 4 via the line connection device 13 in the same way as a normal identification number. At the same time, it is transmitted to the peripheral station 2 via the wired line 31. Also in the peripheral station 2, the transmitted data is sent to the phase compensation device 41 of the transmitting device 4.
and is transmitted from the transmitting antenna 43 via the transmitter 42. The transmitted outgoing data, if it is general pager call data, is received by the receiver of the pager and decoded by the receiver given a number matching the identification number.

By the way, the peripheral station 2 is usually an unmanned station. Therefore, in order for the central station 1 to monitor whether or not the transmitter 42 installed in the peripheral station 2 is transmitting data normally, the encoding device 12 of the central station 1 has a test start function as described above. It has a signal generation function.
The radio paging device 11 also has a test signal generation function. Furthermore, a monitoring device 14 is provided. The test start signal generated by the encoding device 12 and the test signal generated by the radio paging device 11 are predetermined specific numbers of the identification number given to the pager receiver. The signal is transmitted at predetermined time intervals (e.g. once every 10 minutes).
times). In the peripheral station 2, as in the case of the transmission data, the transmission data sent from the central station 1 is branched, the line test receiver 44 decodes and decodes the test start signal, and declares the start of the test.
When the test start is declared, the built-in timer of the line test receiver 44 starts operating, receives the transmitted radio wave, and checks whether the decoded test signal is present within a certain period of time (for example, 2 minutes). If the test signal cannot be received within a certain period of time, an abnormality indication is sent to the monitoring device 14 in the central office 1 via one of the two wired lines 32. Also, line test receiver 44
The other one is sent to the monitoring device by manually dialing a specific number from a regular telephone at any time, receiving the transmitted radio wave at the line test receiver 44, and decoding the test signal. If it is decoded, a normal display is sent to the monitoring device 14 of the central station 1. As described above, the central office 1 can monitor whether the communication line including the transmitter 4 is operating normally. Also, the transmitter 4 in the central station 1 has the same configuration as the peripheral station 2, and can monitor this line.

As explained in detail above, in the case of automatic monitoring performed at a specific cycle in the present invention, a signal is sent to the monitoring device only when there is an abnormality in the line.
Monitoring is much more efficient than before.

[Brief explanation of drawings]

The drawing is a block diagram showing one embodiment of the present invention. In the figure, 1... Central station, 2... Peripheral station,
3, 31, 32... wired line, 4... transmitting device,
10...Trigger signal, 11...Radio paging device, 1
2...Encoding device, 13...Line connection device, 14
... Monitoring device, 41 ... Phase compensator, 42 ... Transmitter, 43 ... Transmission antenna, 44 ... Line test receiver.

Claims (1)

[Claims] 1 A line monitoring method in which transmission data is sent from a central station to a plurality of peripheral stations through a first communication circuit, and the transmission data is wirelessly transmitted from the plurality of peripheral stations, wherein the central station receives a test start signal. The peripheral station includes a generating means, a test signal generating means, and a monitoring means, and the peripheral station is activated by the test start signal sent via the first communication line to generate a signal from among the wirelessly transmitted data. comprising a detection means for detecting the test signal, and when the detection means fails to detect the test signal sent from the central station via the first communication line within a predetermined time after activation; A line monitoring system characterized in that an abnormality detection signal is sent to monitoring means of the central station via a second communication line different from the first communication line.