JPH04127635A - Loop monitor system - Google Patents

Abstract

PURPOSE:To use an optimum transmission line even when a fault takes place in a transmission line and to monitor a station to be monitored by sending other switching pattern in a table means sequentially to a changeover control means as a changeover control signal when an acknowledge signal from a desired monitored station is not received within a prescribed time. CONSTITUTION:A branch section of each loop line is provided with a changeover means 1 and a changeover control means 2 controlling the changeover of the changeover means 1 corresponding to an applied changeover control signal. Moreover, a monitor station is provided with a table means 3 storing plural kinds of changeover patterns of the changeover means 1 so as to send a signal to the desired monitor station while avoiding a transmission line fault point assumed on the transmission line. In this case, when the acknowledge signal from the desired monitored station is not received within a prescribed time, other changeover pattern in the table means 3 is sequentially sent to the changeover control means as a changeover control signal. Thus, even when a fault takes place in the transmission line, the monitored station is monitored by using an optimum transmission line.

Description

Detailed Description of the Invention [Summary] For example, a loop used when a monitoring station monitors a monitored station using a composite loop network formed by combining a plurality of loop lines configured by monitored stations. Regarding the line monitoring method, the purpose of the system is to connect the monitored stations in a ring with transmission lines, so that even if a failure occurs in the transmission line, the monitored stations can be monitored using the optimal transmission line. A monitoring station is connected to one loop line of a composite loop network formed by combining a plurality of loop lines via a switching device, and the monitoring station switches the one loop line in response to the switching state of the switching device. In a loop line monitoring system that sends a signal clockwise or counterclockwise to a loop line, receives a response signal from the monitored station, and monitors the status of the monitored station, the branch section of each loop line a switching means;
The switching control means that controls the switching operation of the switching means in response to the applied switching control signal is sent to the monitoring station to send a signal to the desired monitored station while avoiding the assumed transmission path fault point on the transmission path. Table means storing a plurality of types of switching patterns of the switching means are respectively provided so that the switching pattern can be transmitted, and the monitoring station sends the switching pattern read from the table means to the switching control means as a switching control signal, and responds accordingly. However, if a response signal from the desired monitored station is not received within a predetermined time, another switching pattern in the table means is sequentially transmitted as a switching control signal. The configuration is configured so that the information is sent to the switching control means as follows.

[Industrial Application Field] The present invention relates to a loop used when a monitoring station monitors a monitored station using, for example, a composite loop network formed by combining a plurality of loops configured by monitored stations. This relates to line monitoring methods.

In recent years, when configuring lines, they are often configured in a loop type that allows monitoring even if a failure occurs in the transmission line. but,
When a signal is sent to a loop line, the signal comes back and causes interference, so it was necessary to block the signal coming back.

Therefore, if a signal is not transmitted due to a transmission path failure, stations beyond the point where the failure occurs cannot be monitored.

Therefore, even if a failure occurs in the transmission path, it is necessary to be able to monitor the monitored station using the optimal transmission path.

[Conventional technology]

FIG. 7 shows an example of the conventional loop monitoring system, and FIG. 8 shows an explanatory diagram of the problem.

Here, station A is a monitoring station, and stations a to e indicate monitored stations.

First, in the conventional loop monitoring system, as shown in Fig. 7(a), a transfer type switch (hereinafter abbreviated as S-) is installed between stations a and e of a loop line composed of stations a to e. ) 13 and connect station A to this SW 13.

Now, when station A monitors station C, station A sends a polling signal to station C via stations a and b, and station C sends its own status data as a polling response signal via station b. Return to station A. As a result, station A can know the status of station b and can monitor it.

Now, if a failure occurs in the transmission path between stations B and C as shown in Figure 7 (c), the polling signal from station A will not reach station C, so even after a predetermined period of time has elapsed. , station A cannot receive the polling response signal from station C.

Therefore, as shown in Figure 7 (C), station A switches SW 13 to the opposite side, sends a polling signal to station C via stations e and d, and collects data from station C. , monitors station C.

Here, for a line composed of a combination of two loop lines as shown in Figure 8, stations C and d are not connected as shown by the dotted line, but are used as one loop line as shown by the solid line. do.

Therefore, for example, if the line is disconnected between stations b and C and between stations d and 1 (x mark in the diagram), the route of 8 groups - station e - station d - station C = station f... Since the line is not configured, station C,
It becomes impossible to monitor stations 1g, h, and i.

[Problems to be Solved by the Invention] As described above, since the line is composed of only one loop, monitoring is impossible due to the failure state of the transmission line. There is a problem that there are monitored stations.

An object of the present invention is to enable a monitored station to be monitored using an optimal transmission path even if a failure occurs in the transmission path.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 1 is a switching means at the branch part of each loop line, 2 is a switching control means that controls the switching operation of the switching means in response to the applied switching control signal, and 3 is a switching means on the transmission path. The switching means has multiple types of switching patterns, so that the signal can be transmitted to the desired monitored station while avoiding the transmission path failure point.
This is a stored table means.

Then, the monitoring station sends the switching pattern read from the table means to the switching control means as a switching control signal, switches the switching state of the corresponding switching means, and sends out a signal, but from the desired monitored station. If the response signal is not received within a predetermined time, another switching pattern in the table means is sequentially sent to the switching control means as a switching control signal.

[Function] The present invention is effective at branching portions of each loop line (the total number of input and output lines is 3).
The above part) is provided with a switching control means that controls the switching operation of the switching means in response to the switching control signal applied to the switching means, and the monitoring station is provided with a switching control means that controls the switching operation of the switching means in response to the switching control signal applied to the switching means, and the monitoring station is provided with a switching control means that controls the switching operation of the switching means in response to a switching control signal that is applied to the switching means. A table means storing a plurality of types of switching patterns of the switching means is provided on a birch which can transmit signals to a desired monitored station.

When the monitoring station sends, for example, a polling signal to a desired monitored station, the monitoring station uses, for example, the first switching pattern among the switching patterns stored in the table means as a switching control signal to the switching control means. to switch the switching means.

As a result, when a polling response signal is returned from a desired monitored station, polling of the next monitored station is started.

However, if the polling response signal is not received even after a predetermined period of time has elapsed, the second switching pattern is sent to the switching means as a switching control signal. If the polling response signal cannot be received even with this switching pattern, the switching pattern is changed in order from the third switching pattern and sent as a switching control signal to the branch section of the loop line.

That is, the monitoring station uses the table means to control the switching operation of the switching means, so that transmission path failure points can be avoided and the monitored station can be monitored on the optimal transmission path.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an example of a block diagram of the switching control section in FIG. 2, FIG. 4 is an explanatory diagram of the table in FIG. 2, and FIG. FIG. 6 is an explanatory diagram of the operation of the switching section in FIG. 2, respectively.

Here, the switch 11 is a component of the switching means 1, the switching control section 21 is a component of the switching control means 2, and the table 3 is a component of the table means 3. Also, the same reference numerals indicate the same objects throughout the figures. The operation of FIGS. 2 to 6 will be explained below.

First, Fig. 2 is a line constructed by connecting the dotted lines in Fig. 8 and combining two loop lines, but a switch (hereinafter referred to as a (abbreviated as ) 11.12 and the switch control unit 21, and a table 31 is provided in the A station.

Note that the switch control unit of the 0th station is not shown.

Also, SW 11.12 has (01) and (
10), (11), or (10) in 13,
(01) is added to each, and the total is 11.12 (
Any one of states 01), (10), and (11) becomes a closed state, and 5-13 becomes (10).

It is assumed that one of the states (01) becomes a closed state.

FIG. 3 is a more specific block diagram of the switch and switching control unit in the d station, and the operation thereof will be explained.

The input signal from the e direction is branched by the hybrid 111, and a part is added to the serial/parallel converter (hereinafter abbreviated as S/P) 119 to be converted into a parallel signal and sent to the control section of the d station (not shown). sent to.

The remaining portion is distributed by the distributor 112. SW,, combiner 1
15 and is sent in the C direction. Conversely, the input signal from the C direction is sent to the distributor 116.5W21 combiner 113. It passes through the hybrid 111 and is sent in the C direction.

That is, the connection state of SW 11 in FIG. 2 is that (10) is in the closed state, and (Of) and (11) are in the open state.

On the other hand, in order to receive the switching control signal from station A,
Input signals from the C direction and i direction are sent to distributors 116 and 112.
．． After being distributed in step 118, it is added to the switching control section 21 via the combiner 114.

In the switching control unit 21, the input signal is converted into a parallel signal by the S/P converter 211, and then stored in the RAM 214. C.P.
U212 checks whether the stored signal is a switching control command according to the program in ROM 213, and if it is a switching control command, decodes the switching pattern.

If the switching pattern can be deciphered, driver 215216
, 217 to send corresponding switching control signals to the S1+ sh, , SW2 to switch each S- so as to achieve a specified switching pattern.

FIG. 4(C) shows the sections of stations to be monitored. As shown in the figure, SW 13. Outside 11. During SW 12, the respective sections are named "section 1", "section 2", "section 3" and "section 4".

FIG. 4(a) shows a pattern of switch states for monitoring the above section. For example, in section 4, as shown in Figure 4(b), the switch state pattern is 4.
There are four patterns (double lined portions) shown in FIG. 4(b)-■ to FIG. 4(b)-■. Note that (00) in the figure is a no-operation code, indicating that the state of the switch is not changed.

Next, the operation of the switching section will be explained with reference to FIG.
As shown in figure (a), SW 11 is (01), SW 1
2 is in the state (10) and SW 13 is in the state (01).

Here, station A sets SW 13 to (10), and in order to configure the line in the direction of station a → station b → station C, set 5W12 to (01) and sh 11 to (11). Assume that the switching control signal=1 is sent (see FIG. 5(b)). Therefore, the switching control section of station C recognizes this signal and
12 to the state (01).

After that, the A station goes again in the direction of a station → b station → C station → d station.
The switching control signal -1 is sent out (see FIG. 5(C)). Therefore, the switching control section of station d recognizes this signal and
1 to state (11) (see Figure 5(d))
.

In this way, the line configuration shown in FIG. 4(b) is realized using the S- pattern shown in FIG. 4(a), and the monitored station is monitored.

Now, the operation of FIG. 2 will be explained with reference to FIG. 6. The state of the SW is as shown in FIG. 6(a), and
There is a transmission path failure between stations 0 and 1.
Suppose that station A monitors station g.

At this time, station g is in "section 4", so as shown in Fig. 4(a)
Possible line configurations include the patterns ■ to ■ shown in the figure.

First, as shown in Figure 6(b), station A sends out a polling signal, for example, to station g, but because the line between stations b and C is disconnected, the polling signal is not sent to station g. The polling response signal is not received and the polling response signal is not returned.

Therefore, station A switches 5-13 to (Ol) according to the pattern shown in FIG. 4(a)-■, and then stations 8-e→
A switching control signal for switching 5-11 to (01) is sent to station d, and 5-11 is switched to the (01) state (see FIG. 6(C)). When switching of SW 11 is completed, station A sends a polling signal to station g, but due to a transmission line failure between stations i and h, the polling signal does not reach station g, and the polling response signal is not sent. is not returned (see Figure 6(d)).

So, according to Figure 4 (a)-■, set 5-13 (01)
, a switching control signal to switch SW 11 to (10) -
Send 2, Sen13 (01), 5w1l (10
) (see No. 611ffi (e)). After that, the A station sends the switching control signal -2 again, and 5-1
2 to (11) (see Figure 6).

Then, when the switching of the baskets is completed, the polling signal from the A station is sent out again to the g station (see Figure 6 ((a)). In this case, the polling signal from the A station reaches the g station,
Since the polling response signal can be received from the g station, the g station can be monitored.

In other words, when a monitoring station monitors a monitored station using a composite loop network formed by combining loop lines configured by monitored stations, even if a failure occurs in the transmission path,
The monitored station can be monitored using the optimal transmission path.

(Effects of the Invention) As described in detail above, according to the present invention, even if a failure occurs in the transmission path, the monitored station can be monitored using the optimal transmission path.

[Brief explanation of drawings]

Part 1 is a principle block diagram of the present invention, Figure 2 is a configuration diagram of an embodiment of the present invention, Figure 3 is an example of a block diagram of the switching control section in Figure 2, and Part 4 is a block diagram of the principle of the present invention.
The figure is an explanatory diagram of the double in Fig. 2, Fig. 5 is an explanatory diagram of the operation of the switching section in Fig. 2, Fig. 6 is an explanatory diagram of the operation of Fig. 2, and Fig. 7 is an example of the conventional loop monitoring method. Figure 8 shows an explanatory diagram of the problem. In the figure, 1 is a switching means, 2 is a switching control means, and 3 is a table means. Unexploded B11/) Scrap, Physical Block Diagram 1 Figure Wed/Fri 6p/7 Implementation 1'? 4jL entry-Figure % 2 (Toshu Nei, 1 Hinoki Sp Shudo) ゛a Mick 5q in the 2nd yb in the direction of Figure C
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Claims (1)

[Claims] One loop line of a composite loop network formed by combining a plurality of loop lines formed by connecting monitored stations (a, b, d, f, h) in a ring through transmission lines. A monitoring station (A) is connected to the switching device (SW), and the monitoring station operates clockwise or counterclockwise with respect to the one loop line in accordance with the switching state of the switching device. In a loop line monitoring method in which the state of the monitored station is monitored by transmitting a signal and receiving a response signal from the monitored station, a switching means (1) is provided at a branch part of each loop line, The switching control means (2), which controls the switching operation of the switching means in response to the switching control signal, is connected to the monitoring station to send a signal to the desired monitored station while avoiding the assumed transmission path fault point on the transmission path. A table means (3) stores a plurality of switching patterns of the switching means so as to transmit
), and the monitoring station sends the switching pattern read from the table means to the switching control means as a switching control signal, switches the switching state of the corresponding switching means, and sends out a signal, A loop line monitor characterized in that if a response signal from a monitored station is not received within a predetermined time, other switching patterns in the table means are sequentially sent as switching control signals to the switching control means. method.