JPH01231546A - Alarm display system - Google Patents

Abstract

PURPOSE:To eliminate the difference among display methods of an alarm display element in a system by blinking this display element with a code error alarm and then turning on the same alarm display element continuously with an optical input break alarm respectively. CONSTITUTION:A normal optical input level is gradually reduced and a MINERR alarm signal which is transmitted at occurrence of a small number of code errors is produced at a time point t1. Then an alarm display element 14 blinks in a cycle T2 via the ON/OFF actions of a driving switching element 6c for display of the MINERR alarm. When the optical input level is reduced less, the element 14 blinks in a cycle T1 at a time point t2 via the ON/OFF actions of a driving switching element 6b for display the MAJERR alarm which is transmitted with a large number of code errors. When an optical input break alarm signal is produced when the optical input is broken at a time point t3. Thus the element 14 is always turned on with conduction of a switching element 6a for display of the optical input break alarm. Thus it is possible to eliminate the difference among display methods in a system and to simplify the decision of faults.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alarm display method for displaying a code error alarm and an optical input cutoff alarm of an optical receiver in an optical transmission system using a display element.

[Conventional technology]

FIG. 3 is a circuit diagram showing a conventional alarm display system. In the figure, 1 is an input terminal to which an optical input disconnection alarm signal is input;
2 is an input terminal to which a MAJERR alarm signal sent out when there are many code errors is input; 3 is an input terminal to which a MINERR alarm signal sent out when there are few code errors;
4a and 4b are inverters, 5a to 5C are AND gates, 6a to 6C are driving switching elements such as transistors, 7 is an optical input disconnection alarm display element such as a light emitting diode that displays an optical input disconnection alarm, and 8 is a MAJERR alarm. The operation of the alarm display system having the above configuration will be described with respect to the MAJERR@-report display element such as a light emitting diode for displaying the MINERR alarm display element and the forecast display element 9 such as a light emitting diode for displaying the MINERR alarm. First, when the optical input level is gradually lowered from the normal use level, the MINERR9 report signal is first generated. Therefore, an "H" level MINERR alarm signal is input to the input terminal 3. Therefore, all three input terminals of the anti-game) 5C are at the rHJ level, so its output becomes the "H" level, and the driving switching element 6C becomes conductive. Due to the conduction of this driving switching element 6C, M
The INERR alarm display element 9 lights up and displays the MINERR@ alarm. Next, when the optical input level is further lowered, M
AJERRV alert signal is generated. Therefore, input terminal 2
The MAJERR alarm number at the rHJ level is input.

Therefore, the two input terminals of the AND gate 5b are both at the rJ level, so the output thereof is at the "H" level, and the driving switching element 6b becomes conductive. Due to the conduction of this driving switching element 6b, MA J
The ERR alarm display element 8 lights up to display the MJA ERR alarm. Next, when the optical input is disconnected, an optical input disconnection alarm signal is generated. Therefore, input terminal 1 has rHJ
level optical input sound interruption - alarm signal is input. therefore,
Since both input terminals of the controller 5a are at the "H" level, its output is not at the rHJ level, and the driving switching element 6a becomes conductive. Due to the conduction of the driving switching element 6a, the optical input disconnection alarm display element 7 lights up to display an optical input disconnection alarm. As mentioned above, M
When an AJ alarm occurs, the MINERR notification is prohibited,
Furthermore, the code error alarm is prohibited when an optical input interruption alarm occurs, and is displayed using a total of three alarm display elements such as light emitting diodes.

[Problem to be solved by the invention]

In the conventional alarm display method described above, the code error alarm is closely related to the optical input level in the optical transmission system, so
When displaying with alarm display elements such as individual light emitting diodes, the display method is not necessarily unified, and it is sometimes difficult to judge from the standpoint of maintenance. For example, if the optical input level is gradually lowered from the level normally used, the MIN
ERR alarm occurs. Next, when the light entry camper is lowered, the MAJERR9 report is generated, but at this time, the MI
NERR% reporting may or may not be prohibited.

If the light level is further lowered, a light input cutoff alarm will occur.

In this case, generally the MINERR9 report and MAJERR
Both percentage reports are prohibited, but there may be rare cases where they are not prohibited. As described above, the display method of the alarm display element differs depending on the system, and there is a drawback that it is difficult to judge the alarm in terms of maintenance.

[Failure to solve the problem]

The alarm display method according to the present invention displays a code error alarm by reducing the number of dots on the double-signal display element, and when an optical input disconnection alarm, displays the same double-signal display element by continuously lighting it up. This eliminates differences in the display methods of alarm display elements depending on the system.

[Effect]

This invention eliminates differences in display methods depending on the system.
Determination of failure can be simplified.

〔Example〕

The first part is a block diagram showing an embodiment of the axis report display method according to the present invention. In the figure, 10 is shown in Figure 2 (
11 is a flip-flop; 12 is an AND of the pulse signal output from this pulse signal generator 10 and the output signal of this flip-flop 11; Take the first,
AND gates 13a to 1 that output a pulse signal 12a with a period T2 (however, T2<TI) shown in FIG. 2(d)
3C is an AND gate, and 14 is a notification display element such as a light emitting diode.

Next, regarding the operation of the report display method with the above configuration, p.
This will be explained with reference to Figures 2(a) to 2(f). First, when the optical input level is gradually lowered from the normal use level, the MINERR alarm signal is generated at time t. Therefore, the ``H'' level MINERR alarm signal shown in FIG. 2(c) is input to the input terminal 3. Therefore, all three input terminals of the ant gate 5C are at the rHJ level9, and its output is at the "H" level. Then, the first input terminal of the anime game) 13C becomes rHJ level, and the pulse signal 12a with period T2 shown in FIG. 2(d) is input to the second input terminal, so this pulse The signal 12a outputs. Therefore, the jsA active switching element 6c is driven on and off at a period T. As a result of this on/off operation of the driving switching element 6c, the alarm display element 14 decreases the number of dots at the cycle T2, and displays the MINERR alarm. Next, by further lowering the optical input level,
The MAJERRw notification signal is generated at time t. Therefore, the MAJERRIil-miscellaneous signal at the rHJ level shown in FIG. 2(I) is input to the input terminal 2. This results in
Since the two input terminals of the AND gate 5b are all at the rHJ level, its output becomes rJ and a bell. and,
The first input terminal of the AND gate 13b becomes "H" level, and the second input terminal has the period T shown in FIG.
Since the pulse signal 10a is input, this pulse signal 10a is output from its output terminal. Therefore, the driving switching element 6b is turned on and off with a period T.
Due to the ON/OFF operation of the driving switching element 6b, the alarm display element 14 blinks at a period T, indicating that MAJER is activated.
Display R alarm. Note that at this time, the alarm display element 14
0 blinking The number of blinking times is twice that of the above MINERR alarm. Next, when the optical input is cut off at time t, an optical input cutoff alarm signal is generated.

Therefore, an "H" level input disconnection alarm signal shown in FIG. 2(a) is input to the input terminal 1. Therefore, both input terminals of AND gate 5H are at rHJ level, so its output is at rHJ level.

Since all the two input terminals of the computer game 13a receive rHJ level signals, the output is rHJ.
level, and the driving switching element 6a becomes conductive. Due to the conduction of the switching element 6a, the alarm display element 14 is constantly lit to display a light input disconnection alarm.

As described above, when the optical input level is continuously lowered from the level normally used until the optical input is cut off, the vc@ display element 14 lights up at the pulse interval shown in FIG. 2(f). Note that since each alarm input signal does not become intermittent even near the alarm generation threshold, it is assumed that the alarm input signals are input as shown in FIGS. 2(a) to 2(C). Further, in the above embodiment, the blinking interval of the alarm display element such as a light emitting diode when a code error alarm occurs is divided into two types: the MINERR alarm and the MAJERR alarm, but the invention is not limited to this.
Of course, the blinking interval may be changed more finely depending on the amount of code errors that occur.

〔Effect of the invention〕

As explained in detail above, according to the alarm display method according to the present invention, there is no difference in the display method depending on the system, and the judgment of a fault is not only simplified, but also an alarm display such as a light emitting diode for display Since the number of elements can be reduced from three to one, there are effects such as the ability to reduce the mounting space for components.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the alarm display system according to the present invention, and FIGS. 2(a) to 2(f) are diagrams showing waveforms of various parts to explain the operation of FIG. 1. , FIG. 3 is a block diagram showing a conventional alarm display system. 1 to 3...e input terminal, 4a and 4b...Φ inverter, 5a to 5C1+11...and gate, 6a to
6C...Drive switching element, 10000. Pulse signal generator, 11.・0. flip flop, 12
．． 13a-13C...and gate, 14-...
Alarm display element.

Claims (1)

[Claims] In an optical receiving section of a digital optical transmission system, an alarm comprising means for displaying a code error alarm by blinking a display element, and means for displaying an optical input disconnection alarm by continuously lighting the display element. Display method.