JPS6135740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to data highway disconnection detection, failure station detection, and line reorganization monitoring control.

In the conventional data highway monitoring system, when a certain station breaks down, the following line reorganization is performed. As shown in FIG. 1, in the general data highway system, a backup transmission line is installed, and when the station 105 fails, the monitoring station 100 issues an instruction to the stations 102 and 104 to turn back the transmission line. , the station 105 was disconnected. FIG. 4 shows this state.

By the way, the conventional system has the disadvantage that when the station 105 is restored, the monitoring station 100 cannot know this because the transmission line is not connected to the station 105.

Therefore, it was necessary for a person to issue instructions from the console of the monitoring station. Alternatively, it is necessary to configure the line using software at regular intervals and check for recovery.
It had the drawback of being extremely complicated.

The present invention has been made in view of the above circumstances, and attempts to eliminate the drawbacks of the above-mentioned conventional examples by having an adjacent station detect the recovery status of a failed station and notifying the monitoring station of this. It is.

The details of the present invention will be explained below with reference to FIG. 2 showing an example of the configuration of the station. 200 is a repeater, 201 is a station control section, 202, 2
03 is each device used in the data highway.

FIG. 3 shows the inside of the repeater in more detail, with reference numerals 300 and 301 indicating the sending section, and 302 and 30
3 is a receiving section, 304 and 305 are circuits that detect frames from the received signal, 306 is a section that switches lines based on instructions from the monitoring station and detects the reception status of the repeater, and 307 is a section that detects the reception status of the repeater. A memory that stores the status and status of each device within the station.

Next, to explain the operation of the system of the present invention, it is assumed that one station has failed and transitioned from a normal data highway state as shown in FIG. 1 to a disconnected state. As shown in Figure 4,
Assume that station 405 is out of order.

A monitoring station 400 issues a return command to the station 402 control unit, a signal relay command to the station 405, and outputs a similar command to the station 404 control unit.

As shown in FIG.
04 transmits relay data to station 405. If station 405 is out of order, station 402 outputs 500, 404
The output 501 of the station 405 is cut off, but if the station 405 is restored, the input signals 500, 5
01 is relayed at station 405, 502,
Stations 402 and 404 can be input as 503. When the line at station 405 is in a loopback state, the line returns to route 502 from route 500. The same applies to 501 and 503. If station 405 is through, it will go from 500 to 503, and from 501 to 502.
become. At stations 402 and 404 adjacent to the restored station 405, the received signal from 405 can be detected via a receiving section. Frame synchronization can also be detected. The state changes of these repeaters can be readily seen by comparing them with the contents of memory 307 in FIG. Stations 402 and 404 catch this state change.
The control unit transmits status information to the monitoring station 400. Station 400 can know that 405 has been restored.

As is clear from the above description, in the present invention, unlike the conventional system, the monitoring station causes stations adjacent to the failed station to monitor the failed station, so that no human operation is required. Furthermore, since changes in the status of the repeater are detected and notified to the monitoring station, the hardware is simple, and in particular, there is an advantage that complicated software operations are not required.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram of a data highway in a normal state, Fig. 2 is a block diagram of a station in the present invention, Fig. 3 is an internal block diagram of a repeater in the present invention, and Fig. 4 is a diagram of a data highway in a normal state. FIG. 5 is a wiring diagram showing the line state of the data highway when one of the stations breaks down. 200... Repeater, 201... Station control unit, 300, 301... Sending unit, 302, 3
03... Receiving section, 304, 305... Frame synchronization detection circuit, 306... Repeater reception state detection section,
307...Memory.

Claims (1)

[Claims] 1. In a data highway system in which a plurality of stations are connected to a loop-shaped duplex transmission line, relay data is transmitted from a station adjacent to the failed station to the failed station, and the adjacent station transmits relay data from the failed station to the failed station. A data highway monitoring method, characterized in that the recovery state of the failed station is detected based on the response content of the above, and the monitoring station is notified of the detection result.