JP4521131B2 - Exchange system and exchange - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a button telephone device and a private branch exchange (PBX (Private Branch Exchange)), and more particularly, to improve a message waiting signal transmitted from a switch to a standard telephone set in a guest room such as a hotel. .
[0002]
[Prior art]
The key telephone apparatus functioning as an exchange system has been made highly intelligent by software control using a CPU (processor), and various services can be provided in addition to the original exchange operation. One of the service functions is a message function that can transmit a message to a standard telephone accommodated as an extension.
Generally, a button telephone apparatus having a message function is configured as follows. FIG. 6 is a system block diagram showing the schematic functional configuration, in which 1 (1a, 1b, 1c, 1d) is a standard telephone with a message lamp, and 2 is a key telephone main device as an exchange. The key telephone main device 2 is connected to a standard telephone interface unit 21 (hereinafter referred to as a standard telephone IF) for transmitting and receiving voice signals and control signals to and from the standard telephone 1 and the public line network 5. An office line interface unit 22 (hereinafter referred to as an office line IF) and a time switch 23 for time-division multiplexing audio signals are provided. A single standard telephone IF21 can control transmission / reception of various signals to / from a plurality of standard telephones 1 and is usually routed over several hundred meters in a building or site using a cable that bundles multiple lines. Are transmitted by the relay terminal block 3 and connected to the standard telephones 1a, 1b, 1c and 1d.
[0003]
In the key telephone apparatus as the exchange system, when the user of the standard telephone 1 is absent, a message can be left in a voice mail apparatus (not shown) connected to the key telephone main apparatus 2, but the message is stored. In this case, a message waiting signal is transmitted from the key telephone main device 2 to the standard telephone 1, and the message lamp of the standard telephone 1 is blinked to notify the user that there is a message. The message waiting signal is a pulse signal that message waiting signal transmission detection circuit 211 under the control of CPU212 built into standard telephone IF21 is generated is driven, the message lamp standard telephone 1 receives the pulse signal Flashes. FIG. 4 shows the message waiting signal transmission circuit 211 in more detail. That is, by using the mechanical relay 87, the voltage between the L1-L2 terminals of the standard telephone 1 is changed by switching the negative potential (about -100V) and the ground potential by the power source 88 at a constant cycle (about 1 Hz), and the message The lamp 11 was made to blink.
[0004]
[Problems to be solved by the invention]
However, as described above, when the message waiting signal is generated using the mechanical relay 87, the chattering is performed at the voltage change points H, I, J, K, L, M, and N as shown in FIG. This causes electromagnetic induction to adjacent other lines bundled with cables, and as a result, there is a problem that the line 92 during a call is heard as noise as shown in FIG.
Accordingly, the present invention provides an exchange system and an exchange that can solve the above-described problems and can reduce adverse effects on other lines by a control signal for a standard telephone generated by the exchange such as the message waiting signal. Objective.
[0005]
[Means for Solving the Problems]
The exchange according to the present invention is connected to a standard telephone with a built-in lamp, performs an exchange process for the standard telephone, and turns on the lamp when there is a message to be transmitted to the user of the standard telephone. An exchange for supplying a drive signal, wherein a plurality of semiconductor switches respectively connected to electrodes having different potentials are switched on and off at a predetermined cycle to thereby switch the electrode having the lower potential among the plurality of semiconductor switches. Pulse signal generating means for generating a pulse signal in which a high time when the connected semiconductor switch is off is shorter than a low time when the semiconductor switch connected to the electrode having the lower potential is on; and Transmitting means for transmitting the pulse signal generated by the pulse signal generating means to the standard telephone as the lighting drive signal; Lamp and said semiconductor switch is connected to the connection line connected comprises a hook detection means for detecting the on-hook or off-hook of the standard telephone when the pulse signal is low time. Therefore, in the exchange according to the present invention, since the pulse signal is generated by switching the semiconductor switch on and off to drive the lamp of the standard telephone, the chattering generated at the voltage change point of the pulse signal can be reduced. . In addition, since the switching timing of the semiconductor switch is controlled, there is no practical problem that the hook cannot be detected.
Further, the exchange of the present invention is an exchange that is connected to a standard telephone with a built-in lamp and performs an exchange process on the standard telephone, and includes a first semiconductor switch connected to an electrode having a first potential at one end. A second semiconductor switch having one end connected to the other end of the first semiconductor switch and the other end connected to an electrode having a second potential higher than the first potential ; A low state having a third potential by turning on the first semiconductor switch and turning off the second semiconductor switch at a connection point of the two semiconductor switches, and turning off the first semiconductor switch to and switches the state of the high with a fourth potential by turning on the second semiconductor switch at a predetermined cycle, a high time when said fourth potential, the third potential And control means for outputting a pulse signal shorter than the low time, the pulse signal outputted from said control means, transmitting means for transmitting a lamp incorporated in the standard telephone as a signal for lighting drive, and the lamp Hook detecting means connected to a connection line to which the first semiconductor switch is connected, and detecting an on-hook or an off-hook of the standard telephone at a low time when the first semiconductor switch is turned on.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. Since schematic functional configuration of a key telephone system is the same as FIG. 6, explained is the main part message waiting signal transmission out around the circuit 211 of the present invention. FIG. 1 shows a state in which a message waiting signal transmission circuit 211 and a standard telephone 1 are connected in a key telephone main apparatus as an exchange according to an embodiment of the present invention. A negative potential using photocouplers 71 and 72 is shown. The voltage between the L1 and L2 terminals of the standard telephone 1 is changed by switching the ground potential (about −100 V) at a constant cycle (about 1 Hz), and the message lamp 11 is blinked. That is, the buffer 74 and the inverter 75 are configured to alternately repeat the operation in which one of the photocoupler 71 and the photocoupler 72 is turned off when the other is turned on, and the standard telephone is set between the two photocouplers 71 and 72. Since the 1 L2 terminal is connected, the message lamp 11 can be blinked by changing the voltage between the L1 and L2 terminals of the standard telephone 1. As described above, in the embodiment of the present invention, since the photocouplers 71 and 72 which are semiconductor switches are used instead of the conventional mechanical relay 87, chattering which has occurred mainly due to the mechanical cause is greatly reduced. Therefore, generation of noise due to electromagnetic induction with respect to other lines can be suppressed.
[0007]
Next, a description will be given including a hook detection circuit for detecting on-hook or off-hook of the standard telephone 1. FIG. 2 shows an equivalent circuit obtained by adding a hook detection circuit 79 to the circuit configuration of FIG. The standard telephone 1 is connected to the power supply circuit 85 side of the key telephone main device 2 by a relay 80 in order to receive power supply in a normal state. On the other hand, when a message to be transmitted to the user of the standard telephone set 1 is present, the standard by the control of the CPU212 phone IF21 sends a message waiting signal, but first by switching the relay 80 to turn on output transmission message waiting signal circuit Connected to the 211 side. When the relay 80 is turned on, the circuit configuration is almost equivalent to that in FIG. 1, and the photocouplers 76 and 77 are alternately turned on / off, so that a negative potential (about −100 V) and a ground potential are constant. By switching at a cycle, the voltage between the L1-L2 terminals of the standard telephone 1 is changed. That is, when the photocoupler 76 is on and the photocoupler 77 is off, a negative potential by the power source 78 is applied between the L1 and L2 terminals of the standard telephone 1, and the photocoupler 76 is off and the photocoupler When 77 is on, the ground potential is between the L1 and L2 terminals of the standard telephone 1. A hook detection circuit 79 is connected to one end of the photocoupler 76 on the power supply 78 side via a high impedance R6. However, when the photocoupler 76 is off and the photocoupler 77 is on, the hook detection circuit 79 is released so that the hook of the standard telephone 1 cannot be detected. In order to shorten the state in which such a hook cannot be detected, as shown in FIG. 3, the photocoupler 76 is off and the photocoupler 77 is on (between AB, between CD, and between EF). Of the photocouplers 76 and 77 so that the photocoupler 76 is on and the photocoupler 77 is off (between B-C, D-E, and F-G). If the switching timing is controlled, the problem that the hook cannot be detected does not occur in practice because the cycle of the message waiting signal is about 1 Hz.
[0008]
As described above, according to the embodiment of the present invention, the pulse signal that is the message waiting signal is generated by alternately turning on and off the photocouplers 71 and 72 or 76 and 77 that are the semiconductor switches. Compared to the case where the message waiting signal is generated by turning on and off the mechanical relay 87 as in the prior art, chattering at the voltage change point of the message waiting signal can be greatly reduced. In addition, mechanical switches such as the mechanical relay 87 have a short part life due to friction and the like, and are likely to cause failure. However, since a semiconductor switch is a non-mechanical switch, the life of the part is long and causes failure. Hard to cause. Further, the photocouplers 76 and 77 are turned on / off so that the photocoupler 76 is turned off and the photocoupler 77 is turned on, and the photocoupler 76 is turned on and the photocoupler 77 is turned off. Since the switching timing is controlled, there is no practical problem that the hook cannot be detected. In addition, this invention is not limited to the said structure, You may add a various change in the range which does not deviate from the main point of this invention. For example, in the above-described embodiment of the present invention, the message waiting function has been described. However, the present invention may be applied to a function of blinking a lamp built in the standard telephone 1.
[0009]
In the above-described embodiment of the present invention, the example in which the photocoupler is used as the semiconductor switch has been described. However, in addition to this, a semiconductor switch that can be switched on / off in a non-mechanistic manner similarly to the photocoupler is applied. You may do it.
[0010]
【The invention's effect】
According to the present invention, it is possible to reduce an adverse effect on other lines by a control signal for a standard telephone generated by an exchange.
[Brief description of the drawings]
FIG. 1 is a diagram showing a message signal transmission circuit of an exchange according to an embodiment of the present invention.
2 is a diagram showing an equivalent circuit of the message signal transmission circuit of FIG. 1. FIG.
FIG. 3 is a view showing an output waveform of the message signal transmission circuit of FIG. 1;
FIG. 4 is a diagram showing a message signal transmission circuit of an exchange according to the prior art.
5 is a view showing an output waveform of the message signal transmission circuit of FIG. 4;
FIG. 6 is a diagram showing a schematic functional configuration of a button telephone device.
FIG. 7 is a diagram showing the influence of a message waiting signal (MW signal) on another line.
[Explanation of symbols]
1 (1a, 1b, 1c, 1d) Standard telephone 2 Button telephone main unit 11 Message lamp 21 Standard telephone interface unit 71, 72, 76, 77 Photocoupler 79 Hook detection circuit 211 Message waiting signal transmission circuit 212 CPU

Claims (5)

An exchange that is connected to a standard telephone with a built-in lamp, performs exchange processing for the standard telephone, and supplies a lighting drive signal for lighting the lamp when there is a message to be transmitted to the user of the standard telephone Because
By switching a plurality of semiconductor switches respectively connected to electrodes having different potentials on and off at a predetermined cycle, the semiconductor switch connected to the electrode having the lower potential among the plurality of semiconductor switches is turned off. Pulse signal generating means for generating a pulse signal having a high time shorter than a low time when the semiconductor switch connected to the electrode having the lower potential is on ;
Transmitting means for transmitting the pulse signal generated by the pulse signal generating means to the standard telephone as the lighting drive signal;
Hook detecting means connected to a connection line to which the lamp and the semiconductor switch are connected, and detecting the on-hook or off-hook of the standard telephone when the pulse signal is low time ;
An exchange characterized by comprising. An exchange that is connected to a standard telephone with a built-in lamp and performs an exchange process for the standard telephone.
A first semiconductor switch connected to an electrode having a first potential at one end;
A second semiconductor switch having one end connected to the other end of the first semiconductor switch and the other end connected to an electrode having a second potential higher than the first potential ;
A low state having a third potential by turning on the first semiconductor switch and turning off the second semiconductor switch at a connection point of the first and second semiconductor switches; By switching off the semiconductor switch and turning on the second semiconductor switch, the high state having the fourth potential is switched at a predetermined cycle, and the high time at the fourth potential is changed to the third potential . Control means for outputting a pulse signal shorter than the low time at the time of the potential;
Transmitting means for transmitting the pulse signal output from the control means as a signal for driving a lamp built in the standard telephone; and
Hook detecting means connected to a connection line to which the lamp and the first semiconductor switch are connected, and detecting an on-hook or an off-hook of the standard telephone at a low time when the first semiconductor switch is turned on;
An exchange characterized by comprising.   The control means sets the time for turning on the first semiconductor switch and turning off the second semiconductor switch from the time for turning off the first semiconductor switch and turning on the second semiconductor switch. The exchange according to claim 2, wherein the switch is also longer.   The exchange according to any one of claims 1 to 3, wherein the semiconductor switch is a photocoupler.   An exchange system comprising: the exchange according to any one of claims 1 to 4; and a standard telephone having the lamp built therein.

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