JPH0112458Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an incoming call display circuit in a telephone exchange device, such as a key telephone device, for an outside line communication path that is set from the time when power supply is stopped until the time when power supply is resumed, such as during a power outage or power off. . For example, in a key telephone device, even when power to the main device (connection control device) is stopped, it is possible to identify an incoming call from an outside line (mostly a central office line, hereinafter referred to as central office line). You need to be able to respond. In conventional key telephone devices, the central office line is usually directly connected to a lock-type line selection switch provided on the telephone, and the line selection switch functions as a call path switch, and also functions as a power-off switch. Thus, through the contacts of the restored relay, incoming calls to the de-energized central office line are sent to a separate incoming call display means (usually referred to as an additional bell) from the incoming call display means inside the telephone, for each central office line. Therefore, even if an incoming call occurs on the central office line during a power outage, the incoming call can be answered. However, in recent years, microcomputers have been increasingly introduced into key telephone devices, and processors have made it possible to diversify control. A non-lock type switch with a one-make configuration is used as the line selection switch of the telephone, a call path switch is provided in the main device, and the corresponding cross point of the call path switch is closed under the control of the processor based on commands from the switch. Key telephone devices that connect telephones and central office lines have begun to be manufactured. In such pushbutton telephone devices, as a method for connecting to the central office line when power is not supplied, such as during a power outage, a battery is used to supply power when power is not supplied, and power is supplied from the battery to the processor of the main unit to energize it. Some methods have been adopted, such as maintaining the exchange function of the main device even during a power outage, and using relays to connect each office line directly to a specific telephone when the power is restored by restoring the relay. In the former method, various display controls are generally not performed in consideration of battery consumption, and there is a drawback in that the incoming call is not displayed on the telephone, and in the latter method, direct communication is not performed when power is restored. Since the communication path of the telephone is switched via the main device, it is difficult to maintain communication, and none of the above methods can provide a fully satisfactory result. The present invention provides an "incoming call display circuit" that can solve these conventional problems. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a button telephone device as an example of implementing the present invention, and FIG. 2 is a circuit diagram of a telephone according to an embodiment of the present invention. In Figure 1, ME is the main device, TEL ₁ ~ TEL _n
is a button telephone (hereinafter referred to as the telephone), CO ₁ ~
CO _o is the central office line, and in the main device ME, COT ₁
~COT _o is the office line rank, 1 is the communication path switch (hereinafter referred to as switch), and X ₁₁ ~X _on is switch 1.
cross point, 2 is the processor, 3 is the central line
Incoming call detection circuit that detects incoming calls to CO ₁ to CO _o , 4
When the incoming call detection circuit 3 detects an incoming call, the processor 2 controls the incoming call display control to identify which of the telephones TEL ₁ to TEL _n should receive the call, and sends an incoming call display signal to the identified telephone. circuit,
5 is an energization monitoring circuit that detects cessation of energization; 6 is a power supply circuit that obtains power (DC) to be supplied to each circuit of the main device ME from a commercial power supply (usually 100 V AC);
P is a telephone line. In addition, in FIG. 2, 101 is a telephone network;
102 is an amplifier, 103 is a telephone TEL (TEL ₁ ~
TEL _n ) (Normally, the operating power is the main unit ME
is supplied from the control line via a control line (not shown). ), SP is the speaker,
T is an energization monitoring relay that always operates when energized and recovers when energized, t is the contact of relay T, HS
is a switch, PD is a light emitting diode, C is a capacitor, D is a diode, R is a resistor, and P is a communication line. Before explaining the embodiments of the present invention, it is first necessary to explain the parts and operations related to the present invention regarding the button telephone device that implements the present invention.
The explanation will be given below with reference to FIG. Power is supplied to the main device ME from the power supply circuit 6,
For example, when the main device ME receives an incoming call on the central office line CO ₁ while the main unit ME is busy, the incoming call is detected by the incoming call detection circuit 3 via the central office line trunk COT ₁ , and the processor 2 detects the incoming call on the central office line CO ₁ . Read what's hot. Then, based on the read information, the processor 2 selects a telephone (telephone) that displays the incoming call to the central office line _CO1 .
(one or more of TEL ₁ to TEL _n ), and the incoming call display control circuit 4 closes the route to the identified telephones, for example, telephones TEL ₁ and _{TEL 2} . ₂ through the telephone line P. For example, when the telephone TEL ₂ responds to an incoming call on the central office line CO ₁ using a circuit not shown, the processor 2 detects the response from the telephone TEL ₂ and controls the corresponding cross point X ₁₂ of the switch 1 to be closed. This establishes a connection between the office line CO ₁ and the telephone TEL ₂ , making it possible to make a call. Further, when the power supply to the main device ME is interrupted due to, for example, a power outage, the power supply monitoring circuit 5 detects the interruption of the power supply and sends the detection information to the processor 2. Each circuit of the main device ME continues to be able to operate for a while due to discharge from the power supply circuit 6 and the smoothing capacitor connected to the power supply line of each circuit, and as a result, the processor 2 Performs the following controls. That is, when the processor 2 reads the detection information, it interrupts the processing that is currently in progress and performs the following control using so-called interrupt control.
First, when power is interrupted, e.g.
TEL ₁ and central office line CO ₂ , and telephone TEL ₃ and central office line
Assuming a call is in progress with CO ₄ , processor 2 will keep these connections intact (i.e.
Restoration control of switch 1 cross points X ₂₁ and X ₄₃ is not performed), other station lines CO ₁ , CO ₃ ,
CO ₅ to CO _o send information instructing switch 1 to operate the crosspoint in order to connect to any of the available telephones TEL ₂ , TEL ₄ , TEL ₅ to TEL _n according to predetermined rules. . On Switch 1, close the corresponding crosspoint and connect the station line that is not in use.
Connect any telephone to all of CO ₁ , CO ₃ , CO ₅ to CO _o . The cross points that remain closed or newly closed due to the above operation continue to remain closed due to their latching characteristics even while the current supply is stopped. From then on, incoming signals from the office lines CO ₁ to _{CO o} are sent to the main equipment.
The relevant station line CO ₁ ~ without being controlled by the ME
Sent directly to the phone connected to the CO _o . In the above operation, the central office lines CO ₁ to CO _o and the telephone
The connection with TEL ₁ to TEL _n according to a predetermined rule is performed, for example, as follows. That is, the central office lines and telephones that are not currently connected are connected to each other in order of correspondence starting from the lowest number. In the above example, the office line CO ₁ and the telephone TEL ₂ , the office line CO ₃ and the telephone TEL ₄ , the office line CO ₅ and the telephone TEL ₅ , ... the office line CO _o
and telephone TEL _o (however, m>n. Also, the central office line
It is assumed that there is no call in progress between CO ₆ and CO _o . ) to be connected respectively, the cross points X ₁₂ , X ₃₄ , X ₅₅ ... corresponding to each combination are connected.
X _oo is controlled to close. As is clear from this control, the correspondence between the connected central office line and the telephone set varies depending on the number of ongoing central office line calls when the power is cut off. Therefore, it is necessary to display an incoming call on the telephones TEL ₁ -TEL n, not for the office lines CO 1 -CO _o , but for the telephones TEL ₁ -TEL _n , when the power supply is stopped. Next, FIG. 2 shows a telephone that is an embodiment of the present invention.
The TEL incoming call display circuit will be explained. There are two types of incoming call display means for the telephone TEL. One is an incoming call display means using the amplifier 102 and speaker SP, and the other is a light emitting diode PD.
This is an incoming call display means. The above two incoming call display means are the energization monitoring circuit 103.
selectively by contact t of relay T in
Connected to TEL telephone line P. That is, when electricity is applied (operating power is supplied from the main device ME to the telephone TEL via a data line not shown), the relay T is operating and its contact t is switched in the direction shown by the dotted line. , the input side of the amplifier 102 is connected to the contact t and the switch HS (telephone TEL).
is in the direction shown in the figure when it is empty, and switches to the opposite direction when it is in use. ) is connected to one line of the communication line P on the side from which the incoming call display signal is sent from the main device ME, and the main device ME
In this operation, an incoming call display signal sent from the incoming call display control circuit 4 of the main device ME is input to the amplifier 102 via the switch HS and the contact t, and an incoming call is indicated by the speaker SP. In addition, when electricity stops, such as during a power outage, the relay T is restored and its contact point t returns to the direction shown by the solid line, so the light emitting diode PD is connected to the next path.

[Table] is connected between both lines of the communication line P, and the main device
For example, when an incoming call is received on station line CO ₃ due to ME operation, cross point X ₃₄ of switch 1 closes and
An incoming signal flows directly through the above path of the telephone TEL ₄ connected to CO ₃ , and the light emitting diode PD of the telephone TEL ₄ blinks in synchronization with the incoming signal to indicate an incoming call. In this way, an incoming call from the office lines CO ₁ -CO _o is displayed on the telephone set connected to the office lines CO ₁ -CO _o when the power supply is stopped. As mentioned above, the central line CO ₁ ~ _{CO o}
The correspondence between the telephones TEL ₁ to TEL _n (n of them) differs depending on the situation when the power is turned off.
Although it is not possible to determine from which station line the call is coming from,
This is not an inconvenience when making a phone call. In addition, in the above embodiment, the incoming call display when electricity is stopped is a visible display using a light emitting diode PD.
This can be an audible display, or both display methods can easily be used together. As explained above in detail, according to the present invention, for example, in a button telephone device that directly connects each office line to one of the extension telephones when the power is cut off, which telephone receives an incoming call during the power cut. It has the remarkable effect of being able to reliably identify the presence of heat. Although the present invention has been described with reference to a button telephone device as an embodiment of the present invention, the present invention can also be implemented in an extension telephone of a private branch exchange.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a button telephone device as an example of implementing the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention. Main symbols, ME……Main equipment, TEL ₁ ~ _{TEL n}
(TEL)...Telephone, CO ₁ ~ CO _o ...Outside line (office line), 1...Call route switch, 2...Processor,
3... Incoming call detection circuit, 4... Incoming call display control circuit,
5,103...Power monitoring circuit, 102...Amplifier, SP...Speaker, T...Relay, PD...Light emitting diode.

Claims (1)

[Scope of utility model registration request] The main unit is controlled by a processor and is configured to connect at least an outside line and a telephone set by a switch means having a latching characteristic, and when power to the main unit is stopped, the switch means is operated under the control of the processor to connect the above-mentioned In a telephone exchange, in which an outside line is connected to one of the above-mentioned telephone sets, and the latching characteristic of the above-mentioned switching means is such that the connection is maintained even during de-energization,
The above-mentioned telephone has a first incoming call display means that displays an incoming call under control from the main device when an outside line is received, and a second incoming call display means that directly displays an incoming call based on an incoming call signal from the outside line, and is always operable when the power is on. It has an energization monitoring relay that recovers when the energization stops, and the first
The incoming call display means is connected to one line of the communication line from which the incoming call display signal is sent from the main device via the operating side contact of the energization monitoring relay.
The incoming call display circuit is characterized in that the incoming call display means is connected between both lines of the telephone line via the recovery side contact of the energization monitoring relay.