JPH0230236B2 - BOTANDENWASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a button telephone device comprising a main device having a switching function and a plurality of telephones with button switches.

Such button telephone devices are used for interconnection within relatively small premises, and the main device rectifies the commercial AC power and uses it as a local power source, as well as supplying power to each telephone. It is now being supplied as a Therefore, in the event of an AC power outage, all functions of the device are lost, and even if the main device is connected to the central office line from the central office, and a call is in progress, the call will be disconnected due to a power outage. In addition, in the event of a power outage, each telephone cannot make or receive calls via the local office line.

The present invention has the purpose of fundamentally solving such drawbacks of the conventional art, and provides at least one pair of voice lines (one of L _T1 to L _T8 ) and a pair of signal lines between the main device and each telephone. connected by line L _S. The main unit KSU is equipped with a first switching circuit (relay RT, R ₀₁
contacts rt, r ₀₁ ), and a second switching circuit that disconnects the switch unit from the second telephone line and disconnects the signal line from the signal transmitting/receiving section and connects it directly to the second telephone line (contacts of relay RS, R ₀₂ ). rs, r ₀₂ ), and the button telephone is equipped with a function that disconnects the control unit from the signal line in the event of a power outage, and connects the telephone line to either the voice line or the signal line according to the operation of one of the two telephone line capture switches. It is equipped with third switching circuits lk1, lk2, and t to be connected. Further, in the event of a power outage, an extremely effective button telephone device is provided in which one of the voice line and the signal line is used to connect the telephone line to the office line.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

Figure 1 is a block diagram of the entire configuration, and the main device
Between KSU and each of the multiple telephones TEL ₁ to TEL ₈ ,
A pair of voice lines L _T1 to L _T8 provided for each telephone TEL ₁ to TEL ₈ are connected to a common pair of signal lines L _S and a pair of power lines L _P , and in this example, the total
A 20-core connection cable is applicable.

The main unit KSU also has a switch unit.
A SWU is provided by which each telephone TEL ₁
- Exchange connections between TEL ₈ are made via the trunk unit TKU which supplies communication current, and exchange connections with central office lines SL ₁ and SL ₂ from the central office via line units SLU ₁ and SLU ₂ . The power supply unit PSU supplies direct current power to these devices by rectifying the alternating current power supply AC, while the control unit CTU, which consists of memory, processor, transmitter/receiver, etc., controls the operation of each part. It has become regulated.

Note that each of the audio lines L _T1 to L _T8 only transmits audio signals, and the signal line L _S only transmits control signals in the form of encoded signals of various control information. This means that each phone
As described later, _TEL1 to _TEL8 are also provided with a control section similar to the control unit CTU, and encoded signals are transmitted and received between them.

In addition, the line units SLU ₁ and SLU ₂ are composed of an incoming call detection section, a dial pulse sending section, etc., and detect a ringing signal that arrives when an incoming call is received, give this information to the control unit CTU, and send it to the control unit CTU. Dialing and line hold operations are performed based on the control from the CTU, and the relays installed inside these and the contacts rt of the relay RT, which operates when AC power is applied under the control of the control unit CTU, are used. Then connect each audio line L _T1 to L _T8 to the switch unit SWU,
The signal line L _S is connected to the control unit CTU by the contact rs of the relay RS. Also,
Relays RT and RS connect each audio line L _T1 to
L _T8 and signal line L _S are connected to office lines SL ₁ and SL ₂ .

However, the control unit CTU is designed to maintain operation for approximately 200 to 500 msec even if the AC power supply AC fails due to the large capacitance capacitor C _n , and the control unit CTU is configured to maintain operation for approximately 200 to 500 msec due to the large capacitance capacitor C n, which is supplied from the power supply unit PSU. The ripple component LP before smoothing is controlled by the control unit CTU.
monitors the AC waveform, and if the AC waveform disappears for about 2 cycles or more, it is determined that a power outage has occurred, and relays RT and RS are restored according to the timing described later, and
The switching circuit relays in the line units SLU ₁ and SLU ₂ are restored, and a coded signal indicating a power outage is transmitted to each telephone TEL ₁ to _{TEL 8} via the signal line _LS .

FIG. 2 is a front view showing the arrangement of operation button switches in each of the telephones TEL ₁ to _{TEL 8} , including buttons LK ₁ , LK ₂ for capturing the office lines SL ₁ and SL ₂ using a lock type; Also, a non-clock type hold button HL, a speaker button SP for amplifying the received voice, extension buttons BK ₁ to BK ₈ for selecting each telephone TEL ₁ to TEL ₈ , and a light emitting lamp that lights up in response to these operations. Indicator lights such as diodes
PL _L1 , PL _L2 , PL _SP , PL _B1 to PL _B8 are provided, and a dial button DPB is also provided.

However, extension buttons BK ₁ to BK ₈ and indicator lights
Since the corresponding self in PL _B1 to PL _B8 is unnecessary, a blank cap or the like is inserted.

FIG. 3 is a block diagram showing the main parts of the telephones TEL ₁ to TEL _8. Line terminals S ₁ and S ₂ are connected to the signal line L _S , and line terminals T ₁ and T ₂ are connected to the voice line L _T1 to TEL 8. Connected to L _T8 . When AC power is applied, relay T is connected to the position shown by the dotted line in the figure, and in the event of a power outage, it is restored to the position shown by the solid line. LK ₁ and LK ₂ are switches for station line acquisition, and when either one is turned on, the other is restored. Relay R is an extension button
It is activated by operating BK ₁ to BK ₈ , which connects the line terminals T ₁ and T ₂ and the telephone circuit.
Connect with TC.

On the other hand, line terminals P ₁ and P ₂ connected to the power line L _P
The power supplied from the PS is stabilized by the power supply part PS and is then given to the control part CT, and the line terminals S ₁ and S ₂ are connected to the control part CT, which consists of a memory, a processor, and a transmitting/receiving circuit. The control unit CT receives the encoded signal from the main unit KSU, decodes it, performs control according to the control information of the main unit KSU, and also controls each switch lk ₁ , which corresponds to the operation of the button group. Encoded signals according to the turning on of lk ₂ , hl, sp, bk ₁ to _{bk 8} are transmitted to the signal line L _S , or control corresponding to the operation of the button group is performed.

Note that, like the main unit KSU, the control unit CT uses a large capacitor C _t to connect the line terminals S ₁ and S ₂ .
Approximately 200 to 500 msec even if power supply from
The main unit is designed to maintain operation during this period.
Upon receiving a coded signal indicating a power outage from KSU,
The relay T is designed to be restored at a timing that will be described later.

When the power is turned on, the station line capture switch LK ₁ is turned on, and the telephone circuit TC is connected to the line terminals T ₁ and T ₂ , and at the same time, the control unit CT connects the switch LK to the line terminals S ₁ and S ₂ via the relay contact t. Sends data indicating that ₁ has been manipulated. On the other hand, when the central office line capture switch LK ₂ is operated, contact lk ₂ of that switch turns on, and the telephone circuit TC is switched on.
It is connected to the line terminals T ₁ and T ₂ through the contacts lk ₁ and lK ₂ of LK ₁ and LK ₂ and the contact t of the relay T, and is connected to the line terminals S ₁ and S through the contact t from the control unit CT. ₂ , sends out data indicating that switch LK ₂ has been operated.

When any of the extension buttons BK ₁ to BK ₈ is operated, the control unit CT operates the relay R. For this reason,
Relay contact r is turned on, telephone circuit TC is connected to line terminals T ₁ and T ₂ , and a signal indicating which extension button has been operated is sent from control unit CT to line terminals S 1 and S 2 via contact t. will be sent to.

Next, the operation during a power outage will be explained. At this time, relays T and R are at the positions indicated by solid lines. Therefore, when the central office line capture switch LK ₁ is operated, the telephone circuit TC is connected to the line terminal T _{1 , via the contact lk 1 .}
When the central line capture switch _{LK 2} is operated, the telephone circuit TC is connected to the line terminals S ₁ and S ₂ through the contacts lk1 and lk2 of the switch.

Therefore, when the telephone circuit TC is energized, the central line capture switch LK ₁ , LK _{2 and} the extension button BK ₁ ~
No matter which one of BK ₈ is operated, the line terminals T ₁ , T ₂ ,
In other words, it is connected to a telephone line. However, during a power outage, when the central office line capture switch LK ₁ is operated, the telephone circuit TC is connected to the telephone line via the line terminals T ₁ and T ₂ , and when the central office line capture switch LK ₂ is operated, the telephone circuit TC is connected to the telephone line via the line terminals T 1 and T 2. It is connected to the signal line via terminals S ₁ and S ₂ .

Note that the four contacts t of the relay T and the contacts lk ₁ and lk ₂ of the station line capture switches LK ₁ and LK ₂ constitute a third switching circuit.

FIG. 4 is a circuit diagram of the main parts of the main unit KSU, and when energized, the contacts of each relay are at the positions indicated by dotted lines. The line units SLU ₁ and SLU ₂ are connected to the office lines SL ₁ and SL ₂ via line terminals L ₁ to _{L 4} , and respond to outgoing or future incoming calls to the office lines SL ₁ and SL ₂ . Contacts a ₁ and a ₂ of relays A ₁ and A ₂ to restore the line block the line terminals L ₁ to _{L 4} .
LET ₁ and LET ₂ are connected to close the DC loop, and relays A ₁ and A ₂ repeat operation and recovery according to dial pulse sending control.
Dial pulses are sent out through contacts a ₁ and a ₂ .

However, while the dial pulse is being sent, the relay
Since B ₁ and B ₂ also operate, the blocking wire rings LET ₁ and LET ₂ are short-circuited by contacts b ₁ and b ₂ , and at the same time,
Resistors R ₁ , R ₂ and capacitor C ₁ for spark quenching,
C ₂ is connected between line terminals L ₁ to _{L 4} .

Note that the resistors R ₃ and R ₄ are for providing impedance equivalent to a bell to the line terminals L ₁ to _{L 4} when the relay connections a ₁ and a ₂ are operated.

Also, from both ends of the blocking wire rings LET ₁ and LET ₂ ,
Only the audio signal is extracted by capacitors _C3 to _C6 and sent to the switch unit via line transformers L _T1 and L _T2 .
It is provided to the SWU, and is normally provided by contacts r ₀₁ and r ₀₂ that correspond to the operation of relays R ₀₁ and R ₀₂ .
While a DC loop and a speech circuit are configured, in the event of a power outage, relays A ₁ , A ₂ , R ₀₁ , and R ₀₂ are restored, and line terminals L ₁ and L ₂ are extended to the voice lines L _T1 to L _T8 . At the same time, the line terminals L ₃ and L ₄ are extended to the signal line L _S side.

On the other hand, the audio lines L _T1 to L _T8 and the switch unit
A relay contact rt is inserted between the _SWU and a relay contact rs is inserted between the signal line L _T1 ～
L _T8 is connected directly to the office line SL ₁ , the signal line L _S is connected directly to the office line SL ₂ , and the switch lk ₁ or lk ₂ shown in FIG.
By turning on, each telephone TEL ₁ to _{TEL 8} becomes the central office line.
Connected to SL ₁ and SL ₂ .

Figure 5 shows relays A ₁ , A ₂ , R ₀₁ , R ₀₂ , RT,
This is a timing chart of the situation in which RS and T operate and restore in response to the occurrence of a power outage and recovery, and each relay A ₁ ,
After A ₂ , R ₀₁ , R ₀₂ , RT, RS, and T are in operation, turn on switches lk ₁ or lk ₂ of telephones TEL ₁ to TEL ₈ , and then perform off-hook _FH. Control unit depending on on
The CT sends a coded signal indicating a call to the central office line SL ₁ or SL ₂ , which is sent to the control unit of the main unit KSU.
CTU receives, decodes and sends to relay A ₁ or A ₂
At the same time, in order to control the switch unit SWU, a connection is made to the office line SL ₁ or SL ₂ via the switch unit SWU, and it becomes possible to make calls from the telephone that has performed off-hook FH, and the signal line L _S Dial pulses are sent out in response to the transmission and reception of encoded signals by
TK ₁ is performed.

If a power outage occurs in the AC power supply during this call,
As mentioned above, the control unit CTU detects this and
First, after restoring relays RT, RS and T and disconnecting telephone circuit TC from switch unit SWU and control unit CTU, relays R ₀₁ and R ₀₂
and restore the station lines SL ₁ and SL ₂ to the voice lines L _T1 to L _T8 ,
Connect to signal line L _S.

Therefore, until relays R ₀₁ and R ₀₂ are restored, even if call TK ₁ is interrupted, the circuit that does not go through switch unit SWU is immediately completed, and call TK ₂ using the call current from the local exchange is completed. Since it is carried out, there is no particular problem.

In addition, when a power outage recovers, the control unit CTU will resume operation, and the relay will first
After activating R ₀₁ and R ₀₂ , relays RT and RS are activated and a coded signal indicating recovery from a power failure is transmitted, so relay T is also activated, and after a short call interruption time, switch unit SWU is activated again.
A call TK ₁ is made via .

In addition, each control information at call TK ₁ must be retained even during a power outage, so non-volatile memory such as magnetic memory is used as the memory of the control unit CTU and control unit CT, or dry batteries etc. Control unit CTU for backup
It also needs to be attached to the control unit CT.

In addition, the contacts r ₀₁ , rt of relay R ₀₁ , RT in Fig. 4
constitutes a first switching circuit that bypasses the switch unit and directly connects the voice line and the first telephone line in the event of a power outage, and contacts r ₀₂ and rs of the relays R ₀₂ and RS bypass the switch unit in the event of a power outage. A second switching circuit is configured to disconnect the signal line from the second telephone line, disconnect the signal line from the signal transmitting/receiving unit, and directly connect the signal line to the second telephone line.

Then, connect the relay contacts r ₀₁ and r ₀₂ to the line terminals L ₁ to _{L 4}
Insert immediately after the relays R ₀₁ , R ₀₂ , RT,
Connect RS, T, etc. to the power supply unit PSU and power supply section respectively.
It may be connected to the output side of the PS via a time limit circuit consisting of a capacitor, a resistor, etc., and the operation and recovery may be performed at the same timing as in FIG.

In addition, calls to and from _the office lines SL ₁ and SL ₂ during a power outage can be freely made and answered in the state of call TK _{2 shown} in Figure 5. can.

In addition, to detect incoming calls during a power outage, a separate station line is required.
It is sufficient to use an additional bell connected to SL ₁ and SL ₂ via a bridge, and for dialing during a power outage, the telephone circuit TC
A dial or dialer may be provided inside.

Therefore, even during a power outage, the office line remains
SL ₁ and SL ₂ can be used from each telephone TEL ₁ to _{TEL 8} , and even if a power outage occurs during a call using the office lines SL ₁ and SL ₂ , the call state is maintained, so the device is Reliability is greatly improved.

However, depending on the conditions, in the event of a power outage, the station line SL ₁
Alternatively, SL ₂ may be connected only to one of the audio lines L _T1 to L _T8 and the signal line L _S ,
The number of telephones TEL ₁ to _{TEL 8} and the configuration of each part can be arbitrarily selected according to conditions, and various modifications are possible.

As is clear from the above explanation, according to the present invention, it is possible to use the local office line from each telephone even in the event of an AC power outage, and it is possible to freely make and answer calls, and to automatically make and receive calls. Because of this continuous operation, operational reliability and advantages are greatly improved, and the key telephone device has remarkable effects for various purposes.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, Fig. 1 is a block diagram of the entire configuration, Fig. 2 is a front view showing the arrangement of operation button switches in each telephone, and Fig. 3 shows the main parts of the telephone. FIG. 4 is a block diagram of the main parts of the main device, and FIG. 5 is a timing chart showing the operation and recovery status of each relay. KSU...Main unit, TEL ₁ to TEL ₈ ...Telephone,
L _T1 to L _T8 ...Audio line, L _S ...Signal line, L _P ...Power line, LS ₁ , LS ₂ ...Station line, AC...Alternating current power supply,
PSU...power supply unit, PS...power supply section, CTU...
...Control unit, CT...Control section, a ₁ , a ₂ , r ₀₁ ,
r ₀₂ , rt, rs, t...Relay contact (switching circuit),
C _n , C _t ... Capacitor.

Claims (1)

[Claims] 1. A first and a second telephone line are accommodated, and when electricity is applied, a switch unit is driven in response to line selection information output from a signal transmitting/receiving section connected to the signal line to select the voice line. The main device that performs exchange connection with one of the telephone lines connected to the main device and the main device are connected by at least one pair of signal lines and one pair of voice lines, respectively, and when the power is turned on, the control unit operates a switch for capturing the telephone line. In a button telephone device consisting of a plurality of button telephones that send telephone line capture signals to signal lines in accordance with The main device is equipped with a first switching circuit, a second switching circuit that disconnects the switch unit from the second telephone line in the event of a power outage, and disconnects the signal line from the signal transmitting/receiving section and connects it directly to the second telephone line, and Sometimes the control section is disconnected from the signal line and 2
1. A button telephone device comprising a third switching circuit for connecting a telephone circuit to either a voice line or a signal line in response to the operation of one of two telephone line capturing switches.