JPH04124961A - Private exchange - Google Patents

Abstract

PURPOSE:To prevent talking continued from the time when it is in service interruption from being cut off in the middle of it immediately after the service interruption is released by providing a means to monitor the talking condition of a telephone for service interruption immediately after the service interruption is released in a main device and automatic-controlling a means to switch an outer line and an extension based on the monitored result. CONSTITUTION:When a power source monitoring part 129 detects release immediately after service interruption is released, a power source for relay driving is supplied to a relay driving part 12B through a signal line 131. A talking condition monitoring part 107 notifies to the CPU of a control part 117 that it is in talking. Thus, a RC relay is held in a condition in the service interruption. When the talking is finished after that, the RC relay is driven by a signal from the talking condition monitoring part 107 and respective points of contact are connected to a broken line side.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a private branch exchange, in particular, a private branch exchange that accommodates an outside line and an extension line, and further accommodates a power outage communication device on the extension side, so that calls can be made using the power outage communication device in the event of a power outage. This relates to private branch exchanges that can be used.

[Prior Art] FIG. 4 shows the configuration of a private branch exchange using a conventional power outage telephone.

In FIG. 4, reference numeral 400 is an outside line, 401 is an outside line switching relay, and 404 is a switching device.

406 is an extension switching relay, 408 is an extension power outage telephone, and relays 401 and 406 are configured to allow the line 402 to be used as a detour in the event of a power outage.

That is, when power is being normally supplied to the switching device 404 from a commercial power supply or the like, the outside line 400 is connected to the switching device 400 via the broken line of the outside line switching relay 401 and the line 4°3.
Connected to 4.

Furthermore, if a call is made on the path leading to the extension power outage telephone 408 via the line 405, the broken line side of the extension switching relay 406, and the line 407, and the power supply to the switching device 404 is lost due to a power outage, etc., the external line is automatically switched. Relay 401 and extension switching relay 406 are restored, and outside line 400 is directly connected to extension power outage telephone 408 via line 402.

Further, when the power supply to the switching device 404 is restored, the outside line switching relay 401 and the extension line switching relay 406 are automatically activated so that the call can be made through the normal route as described above.

Note that a configuration in which a manual changeover switch is provided in place of the outside line switching relay 401 and the extension line switching relay 406 is also known.

[Problems to be Solved by the Invention] However, in the above conventional example, when the extension power outage telephone 408 begins to be used during a power outage and the power outage is restored during a call,
When the outside line and extension line switching means are automatic means such as relays, there is a drawback that the call route is unconditionally cut off, resulting in the call being cut off midway.

On the other hand, when the outside line and extension line switching means is a manual means such as a switch, there is a drawback that the operation is cumbersome, such as erroneously operating the switch or forgetting to change it, and is not easy to use.

An object of the present invention is to solve the above problems and provide a private branch exchange that can automatically and reliably perform line backup and restoration processing in the event of a power outage without requiring troublesome operations.

[Means for Solving the Problems] According to the present invention, in a private branch exchange that accommodates an outside line and an extension line, and further accommodates a communication device for power outage on the extension side, and allows calls to be made using the communication device for power outage during a power outage, means for changing the connection to the power outage line using the power outage communication device according to the power supply status of the exchange; means for monitoring the communication status on the power outage line; If the communication using the power outage line is continuing, the switch to the power outage line is maintained until the end of the communication, and if the communication using the power outage line is continuing when the power is restored, the power outage line is switched to the power outage line until the end of the communication. We adopted the means-terakamase-ji configuration, which maintains the switching to the main line side, and has a control means to switch to the main line side after the communication ends.

[Operation] According to the above configuration, it is possible to maintain the communication that has been continued during the power outage immediately after the power outage is restored, and it is also possible to automatically restore the normal state when the communication ends.

[Examples] The present invention will be described in detail below based on examples shown in the drawings.

First Embodiment <Device Configuration> In FIG. 1, numeral 100 is the main device of the private branch exchange, 101 is the network connected to the outside 11102.1o3,
Reference numeral 104 denotes an outside line switching unit, which has relay contacts for rcO and rcl, and is controlled by a relay drive unit 128 (7).
02, 103 (Ll, L2) to the call status monitoring unit 107 via the line 105.106, or the line 108.1
09 to the outside line interface 110.

An outside line interface 110 is connected to a call path switch 112 via a call path 111.
Lines 113 and 114 from 7 are connected to an extension interface 119 and a power outage telephone 125.

Reference numeral 117 denotes a control unit, which is configured using a microprocessor, etc., and controls all of the private branch exchange equipment 100, and connects the outside line interface 1l via the control bus 115.
O1 extension interface 119 and call path switch 1
12 and further connected to relay drive unit 1 via 130.
28 and receives information from the power supply monitoring section 129 via 128.

In the above configuration, the explanation will be divided into the operation when a power outage is detected, the call operation during the power outage, the operation immediately after the power is restored, and the operation when the call ends. Please refer to FIGS. 2 and 3 for the configuration.

<Operation when a power outage is detected> When a power outage occurs due to a problem with the power source for supplying power to the private branch exchange device 100, such as a commercial power source such as a boat or an emergency power source such as a battery, a signal 131 is sent from the power source monitoring unit 129. When the relay drive section 128 detects the occurrence of a power outage, the contacts rcO and rcl of the external line switching section 104 are switched to line 1
Drive to connect to 05 and 106 sides.

Therefore, when these operations are completed, the network 101 (
The outside line 102.103) is the rcO of the outside line switching unit 104.
and rcl contacts and lines 105 and 106 to the call status monitoring unit 107, and the power outage telephone 125 is connected to the call status monitoring unit 107.

<Call operation during power outage> Here, FIG. 2 shows the configuration of the call status monitoring section 107.

In FIG. 2, reference numeral 200 is a photocoupler having bidirectional light emitting elements, each of which has a line 106.
and 114. The line 105 is directly connected to the line 113.

The collector of the transistor on the light receiving side of the photocoupler 200 is connected to a +5V power supply via a resistor R201, and the emitter is connected to ground.

In the above configuration, when a communication current flows from the line 106 to the line 114 or from the line 114 to the line 106, the light emitting element of the photocoupler 200 emits light, the light receiving transistor turns on, and the signal line 1
32 from +5V to Ov.

On the other hand, when the communication current stops flowing, the light-receiving side transistor of the photocoupler 200 is turned off and the signal line 132 is changed from OV to +.
Change it to 5V.

After answering an incoming call from the outside line 102 or 103 or making a call from the power outage telephone 125, the call current passes from the outside line 102 to the line 105, the call status monitoring unit 107, the line 113, the DC circuit of the power outage telephone 125, and then to the line 114. ,
The signal passes through the light emitting element of the photocoupler 200 of the call status monitoring unit 107 and flows along the path of the line 106 and the outside line 103.

At this time, the light emitting element of the photocoupler 200 emits light, and its light receiving transistor turns on, but due to the power outage, +5V
Since power is not supplied to the terminal, no electrical signal appears on the signal line 132. In this state, the telephone conversation continues even after a power outage.

<Operations Immediately After Power Restoration> When the problem with the power supply for supplying power to the private branch exchange device 100 is resolved, the power outage is restored, and the power is turned on, a restoration signal is sent from the power monitoring unit 129 to the control unit via the signal line 128. 117, and the signal line 13 to the relay drive unit 128.
1 respectively.

Here, FIG. 3 shows the configuration of the control section 117 and the relay drive section.

In the control unit 117, a bus control unit 300 controls a bus connected to the control bus 115, and is connected to a CPU 301 including a microprocessor or the like.

If a three-state circuit is used for the terminal that outputs the signal 130 to the relay drive unit 128, the CPU 301 will be in a high impedance state in the reset state, and at that time the signal line 130 can be fixed at Ov by the resistor 302.

A signal line 128 from the power monitoring unit state 129 is also connected to the CPU 301 .

In the relay drive unit 128, reference numeral 305 is an RC relay, and its contacts rco and rcl are connected to the outside line switching unit 104.
It is in.

A diode (Di) 307 and a diode (D2) 308 are for protection of the back electromotive force of the relay.

Reference numeral 309 is a transistor (Tr2), and during a power outage, electricity is not supplied from the power supply monitoring unit 129 via the signal line 131, so the RC relay 305 is not driven.
The contacts are connected as shown by solid lines in FIG.

Next, immediately after the power outage is restored, when the power supply monitoring section 129 detects the restoration, the relay driving section 128
The controller 11 starts supplying power for driving the relay to the controller 11.
The restoration is reported to the CPU 301 of No. 7 via the signal line 128. Upon restoration, +5V power is supplied to each part, so the electric circuits start operating.

In general, a power-on reset signal is supplied to each part for about several tens of microseconds immediately after the +5V power supply rises in order to correct the state of the entire device. As a result, the CPU 301 is also reset. At that time, as mentioned above, the signal line 103 is
RC during the transition period of +5V power supply rise.
It is possible to prevent the relay 305 from operating in an unstable manner.

When the reset is released, the CPU 301 immediately outputs OV to the signal line 130 to keep the RC relay 305 in a power out state by turning off the transistor Tr2 so that it is not driven.

Next, as shown in FIG. 2, when the operation of the call status monitoring unit 107 starts, the +5V power supply is turned on, and if a call is in progress, an Ov double signal is sent to the outside line interface 110 from the signal line 132 as described above.

When the outside line interface 110 receives the Ov double signal,
After the reset is released, the control unit 117 via the control bus 115
C, notifies the PU 301 that the call is in progress.

As a result, the CPU 301 continues to output OV to the signal line 130 and maintains the RC relay 305 in the power outage state. −
In the case of a powerless communication state, a +5V signal is sent from the signal line 132 to the outside line interface 110 as described above.

When the external line interface 110 receives the +5V signal, after the reset is released, the control unit 117
It notifies the CPU 301 of the no-call state.

As a result, the CPU 301 outputs +5V to the signal line 130, turns on the transistor 309, drives the RC relay 305, and connects each contact to the dotted line side shown in FIG.

<Operation at end of call> As mentioned above, the call continued during the power outage is maintained even after the power is restored, and when the call ends, the signal 132 from the call status monitoring unit 107 changes from Ov to +5V. Therefore, when the external line interface section 110 detects this, it notifies the control section 117 via the control bus 115, and the CPU
301 is the RC relay 305 with the signal line 130 set to +5v.
is driven to connect each contact point to the side shown by the broken line in FIG.

According to the above embodiment, the main device is provided with a means for monitoring the call status of the power outage telephone immediately after the power is restored, and the means for switching between an outside line and an extension is automatically controlled based on the monitoring results. Calls that have been continuing during a power outage can be maintained as they are, and calls will no longer be cut off midway, as was the case in the past.

In addition, it detects the termination of a call that has continued during a power outage,
Since the normal state can be restored automatically, there is no need for troublesome manual switching unlike in the past, and an easy-to-use and highly reliable private branch exchange can be provided.

Second Embodiment In the above embodiment, a configuration was shown in which line switching in the event of a power outage is performed on the outside line side, but as shown in Figure 5, a configuration in which line switching in the event of a power outage is performed on the internal line side is also conceivable. .

In FIG. 5, the extension switching unit 1 is connected to the lines 123 and 124 between the extension interface 119 and the power outage telephone 125.
22 are provided.

The relay control circuits of the call status monitoring section 107 and the extension switching section 122 can be constructed in the same manner as those shown in FIGS. 2 and 3.

Regarding control during power outage and power restoration, the only difference is whether line switching is performed on the internal line side or on the external line side, and the call state detection and line switching procedures themselves are performed in the same way as described above.

The configuration shown in FIG. 5 also provides the same effects as those of the embodiments described above.

It goes without saying that in each of the above embodiments, the power outage telephone can be replaced with various communication devices.

[Effects of the Invention] As explained above, according to the present invention, in a private branch exchange that accommodates an outside line and an extension line, further houses a communication device for power outage on the extension side, and allows calls to be made using the communication device for power outage during a power outage. , a means for changing the connection to the power outage line using the power outage communication device according to the power supply state of the private branch exchange; a means for monitoring the communication state on the power outage line; If communication using railway lines is ongoing,
The system employs a configuration that maintains the switching to the power outage line side until the end of the communication, and then controls the switching to the main line side after the end of the communication, so that immediately after the power outage is restored, It is possible to maintain communication that has continued during a power outage, and it is also possible to automatically restore the normal state when the power outage ends, so there is no need for troublesome operations, and line maintenance during a power outage is automatically and reliably maintained. It is possible to provide an excellent private branch exchange that can perform backup and recovery processing.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a horizontal switchboard adopting the present invention, Fig. 2 is a block diagram of a call status monitoring section, Fig. 3 is a block diagram showing main parts of the relay drive section of Fig. 1, and Fig. 4 is a block diagram of a conventional private branch exchange, and FIG. 5 is a blower diagram showing a different embodiment of the private branch exchange. 0...Private branch exchange 4--Outside line switching unit 7...Call status monitoring unit 2--Inner line switching unit 9...Power supply monitoring unit

Claims (1)

[Scope of Claims] 1) In a private branch exchange that accommodates an outside line and an extension line, and further accommodates a communication device for power outage on the extension side, and allows calls to be made using the communication device for power outage in the event of a power outage, depending on the power supply state of the private branch exchange, , a means for replacing the connection to the power outage line using the power outage communication device, a means for monitoring the communication status on the power outage line, and a means for monitoring the communication state using the power outage line when the power outage is restored. In this case, a private branch exchange is provided with a means for controlling the switching to the power outage line side until the communication ends, and controlling the switch to the main line side after the communication ends.