JPS62159541A - Switching system for communication unit - Google Patents

Abstract

PURPOSE:To efficiently use a standby unit by activating switchingly an input of an active unit to the standby unit when an alarm is raised from other active unit even when the changeover of an active unit is locked as the result of repetitive changeover. CONSTITUTION:When a unit input 7-1 is interrupted, since an active unit 5-1 outputs an alarm, an alarm reception circuit 6-1 outputs a signal and a switch control section 2-1 switches a changeover switch 1-1 to the position of the standby unit 9. However, the input is interrupted, then the standby unit 9 raises alarm immediately and an alarm reception circuit 10 sends a signal to a switch control circuit 4. When a control section 3 receives the signal, a control signal is sent to the switch control section 2-1 to turn the changeover switch 1-1 to the position of the active unit 5-1. When the control section 3 judges that all active units are not locked, any active unit is judged that it is reciprocated for a prescribed number of times or over with the standby unit for a prescribed time or not. In this case, the changeover switch 1-1 is fixed to the position of the active unit 5-1.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a system that includes a plurality of active communication equipment units such as a communication multiplexer and one standby communication equipment unit. A communication device unit switching method in which when an alarm is output, the input of the active communication device unit is switched to the standby communication device unit, and when an alarm is output from the standby communication installed unit, it is switched to the original active communication device unit. More specifically, the present invention relates to a switching lock method when switching between the active communication device unit and the standby communication device unit is repeated.

(Prior Art) In the above-mentioned switching system for communication multiplexing equipment, etc., a specific working communication multiplexing equipment unit (hereinafter referred to as a working unit) is used.

) is disconnected, an alarm is output from the active unit, so the standby communication multiplexer unit (
Hereinafter referred to as a spare unit. ), but since the input is disconnected, the spare unit continues to be switched to the original working unit for outputting an alarm, and this switching operation is repeated as long as the input disconnection continues.

Conventionally, in order to prevent this, the switch was controlled so that the input was locked to the current unit when a repetitive operation was performed a predetermined number of times within a predetermined period of time.

Then, when a certain period of time or more elapses from that point, or when a lock reset signal is input, the fixed control switch is released, and the input to the current unit is unlocked.

(Problems to be Solved by the Invention) In conventional control, as described above, when one switch is locked in the relationship between a pair of active units and a standby unit, the entire unit switching system becomes locked. Therefore, even if another active unit requests switching to the standby unit, the currently locked active unit will be unlocked and the second active unit will be unlocked.
The drawback was that it would not switch unless there was a problem.

FIG. 8 is a flowchart of a conventional switching method. The conventional switching operation procedure is as follows.

First, it is determined whether any active unit is locked (21). If it is not locked, it will continue to be monitored. If it is determined that the unit is in the locked state, switching between the active and spare units is prohibited (22). Furthermore, it is determined whether a certain period of time has elapsed since the locked state or whether a lock reset signal has been input. If a certain period of time has not passed and the lock reset signal has not been input, continue monitoring. When a certain period of time has elapsed or a lock reset signal is input, the lock and switching prohibition are canceled (24) and the process returns to the start. Since the entire process is in a locked state from the above-mentioned prohibition of switching between active and spare units to the lock and cancellation of the switching prohibition, it is not possible to switch the input of other active units even though the spare unit is actually in an empty state. I couldn't do it.

SUMMARY OF THE INVENTION The object of the present invention is to overcome the above-mentioned drawbacks, by applying a locking scheme individually over all combinations between working reserve units, the combinations between a pair or several working reserve units can be locked. It is an object of the present invention to provide a communication device unit switching method that further improves the reliability of a communication device system by making it possible to switch the input of another active unit to a standby unit even when the communication device system is in use.

(Means for Solving the Problems) In order to achieve the above object, the communication device unit switching method according to the present invention provides a switching method for communication device units, a plurality of active communication device units, one standby communication device unit, and each of the current communication devices listed in mJ. an alarm receiving circuit for receiving the alarm outputs of the unit and the standby communication device unit, respectively; a switch for switching and connecting the respective inputs to the working communication device unit to the working communication device unit and the standby communication device unit; When the output is received, the corresponding switch is switched to the backup communication device unit, and the alarm reception circuit output of the backup communication device unit is received.
M So, IxEL--+'J L Ill'J-'n
The switch is controlled to be switched to the original working communication equipment unit, and when the repetition of these switching operations satisfies a predetermined condition, the switch is fixed on the working communication equipment unit side, and this It also includes a switch control circuit that controls switching of the corresponding switch to the standby communication device unit when there is an output from another alarm receiving circuit.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a switching system for an active communication device unit according to the present invention. This embodiment shows an example in which communication multiplexing equipment is used as the active and standby units. n active units 5-1 to 5-n are installed, and a spare unit 9 is installed as a backup for these units. Alarm receiving circuits 6-1 to 6-n and lo are connected to the active units 5-1 to S-n and the standby unit 9, respectively. The unit inputs 7-1 to 7-n are connected to the current 22 bits 5 through changeover switches 1-1 to 1-n, respectively.
-1 to S-n.

The switches 1-1 to l-n in the figure are shown switched to the active unit side.

The switch control circuit 4 includes switch control sections 2-1 to 2-n corresponding to the changeover switches l-1 to 1-n and a control section 3. When the switch control units 2-1 to 2-n receive signals from the alarm receiving circuits 6-1 to 6-n, they control the corresponding changeover switches 1-1 to 1-n to switch the unit person cuffs-1 to 7-. Switch n to spare unit 9. In this case, if there is a changeover switch on the spare unit 9 side, the other changeover switches are not changed. Only one changeover switch can be switched only when the spare unit 9 is not in use.

When the control section 3 receives the signal from the alarm receiving circuit 10, it controls the switch control sections 2-1 to 3-n to switch the changeover switch that has been switched to the spare unit side to the original working unit side. The control unit 3 also monitors whether or not a changeover switch has repeated the switching operation a predetermined number of times within a certain period of time, and if it detects this state, it issues a control instruction to the corresponding switch control unit to switch the switch. Lock the switch to the current unit side. Then, when a certain period of time has elapsed from that point or when a lock reset signal is input, a release signal is sent to the corresponding switch control unit to release the lock. If a signal is output from the alarm receiving circuit of another active unit while one changeover switch is locked, the corresponding switch control section can control the changeover of the changeover switch.

FIG. 2 is a flowchart of the switching operation of the first leg.

This will be explained in detail according to this flowchart. For example, when the unit person cuff-1 is disconnected, the active unit S-1 outputs an alarm, so the alarm receiving circuit 6-1 outputs a signal, which causes the switch control section 2-1 to switch the changeover switch l.
-1 to the spare unit 9 side. However, since the input is cut off, the spare unit 9 immediately outputs an alarm, and the alarm receiving circuit 10 sends a signal to the switch control circuit 4.

When the control section 3 receives this signal, it sends a control signal to the switch control section 2-1 to switch the changeover switch l-1 to the active unit 5-1 side.

On the other hand, the control unit 3 determines whether all active units are locked (11). If it is determined that this is not the case, then check whether any of the working units has switched back and forth with the standby unit more than a certain number of times within a certain period of time.
Determine whether or not (12).

In this case, the input is disconnected, so the judgment in step 12 is affirmed, and under the control of the control section 3, the changeover switch l-1 is fixed to the active unit 5-1 side (18
). In this state, it is possible to switch the input of another active unit to the standby unit.

Next, it is determined whether a certain period of time has passed since the lock state was entered, or whether a lock reset signal has been input (14).
), if this is satisfied then tl? The lJ control section 3 controls the release of the mouth section 3 (15).

(Effects of the Invention) As explained above in detail, even if the switching of a certain working unit becomes locked as a result of repeated switching operations, if an alarm is output from another working unit, the present invention Since the input of the active unit is switched to the standby unit, the standby unit can be used efficiently, and the reliability of the entire system can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication device unit switching method according to the present invention, FIG. 2 is a 70-chart for explaining the operation of FIG. 1, and FIG. 3 is a diagram explaining a conventional switching method. It is a flowchart of rounding. 1-1 to 1-n... Active spare unit changeover switch 2-1 to 2-n... Switch control section 3... Control section 4.011- Own switch control circuit 8-1 to 5- n...@-current unit 6-1 to 43-
n・Fist・Alarm receiving circuit 7-1 to 7-n...Unit input 8-1 to B-n---・Control signal 9 @ @ 1111-Spare unit 10...◆・Alarm receiving circuit patented, Applicant NEC Corporation Representative Patent Attorney Jusai Ino 1 Figure 21! ! Figure 3

Claims (1)

[Claims] a plurality of active communication device units, one standby communication device unit, an alarm receiving circuit that receives alarm outputs of each of the active communication device units and the standby communication device unit, and a respective input to the active communication device unit; When receiving the output of the switch connecting the active communication device unit and the backup communication device unit and the alarm reception circuit, the corresponding switch is switched to the backup communication device unit, and the alarm reception circuit output of the backup communication device unit is switched. When a switch is received, the switch that has been switched to the standby communication device unit is switched to the original working communication device unit, and when these switching operations meet a predetermined condition, the switch is switched to the working communication device unit side. 1. A communication device unit switching system comprising a switch control circuit which is fixed and controls switching of a corresponding switch to a standby communication device unit when another alarm receiving circuit outputs in this state.