JPH04269092A - Home telephone exchange system - Google Patents

Abstract

PURPOSE:To arbitrarily set a telephone set to execute a line wire calling at the time of service interuption. CONSTITUTION:A service interuption ditection circuit 34 which detects service interuption is provided. Latching relays are used as all relays Ry. The memory incorporated in a control circuit 11 stores an extension L1 which is needed to be connected with a line wire L0 at the time of service interuption. The content of the memory can be changed by a dial input of a telephone set C. The control circuit 11 drives the relay Ry to connect a corresponding extension L2 with the line wire L1 at the time of service interuption.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home telephone exchange system that allows outside and internal calls to be made using commercially available telephones.

0002

BACKGROUND OF THE INVENTION This type of home telephone switching system includes a telephone exchange connected to an outside line, which is a public telephone line, and an extension line serving as a telephone line and a control line serving as a signal transmission line to the telephone exchange. It consists of a plurality of telephone outlets to which commercially available telephones can be detachably connected, and the above-mentioned telephone exchange switches and forms communication paths between outside lines and internal lines, or between extension lines, and the telephones connected to the telephone outlets can be used to make external calls and make internal calls. There is one that allows you to make phone calls. In addition, in this type of home telephone exchange system, the door intercom is connected to the telephone exchange through a telephone line, and the telephone can also be used to make door intercom calls.

0003

[Problem to be Solved by the Invention] By the way, in this type of conventional home telephone exchange system in which up to three telephones are connected, there is a problem when the telephone is disconnected from outside calls during a power outage. In order to prevent outside calls from being interrupted even in the event of a power outage, all extension lines are always connected to outside lines in the event of a power outage.

However, this is not a problem in the case of a home telephone switching system that connects up to three telephones;
In a home telephone exchange system that allows connection of three or more telephones, three or more telephones will be connected to an outside line during a power outage, which poses the problem of not meeting terminal equipment technical standards. In order to prevent this, some telephones are designed to allow outside calls to be made during a power outage using telephones whose number does not meet the technical standards for terminal equipment.

However, in this case, there is a problem in that outside calls can only be made using a predetermined telephone, and in order to be able to make outside calls using the desired telephone even during a power outage, it is necessary to change the wiring. Ta. The present invention has been made in view of the above-mentioned points, and its purpose is to provide a home telephone exchange system that can arbitrarily set a telephone capable of making calls during a power outage without changing the wiring. be.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a power outage detecting means for detecting a power outage, an extension that continues an outside call state in the event of a power outage, and a system that can freely rewrite the stored contents. The apparatus includes a storage means, and a connection means for connecting the extension line stored in the storage means to an outside line in the event of a power outage.

[0007] Furthermore, if a rewriting means is provided that allows the contents of the storage means to be freely rewritten by inputting a dial signal from a telephone, and it is possible to change the telephone with which calls can be made during a power outage by inputting a dial, then It is easy to change the phone that can be used for making calls.

[0008]

[Operation] By configuring the present invention as described above,
When a power outage occurs, the extension stored in the storage means can be connected to an outside line so that the desired telephone can be used for calls even during a power outage, and the contents of the storage means can be arbitrarily rewritten. This makes it possible to easily change the telephone that can be used for calls during a power outage without changing the wiring.

[0009]

Embodiment FIGS. 1 and 2 show an embodiment of the invention. As shown in FIG. 2, the home telephone switching system of this embodiment has the following features:
A telephone exchange A connected to an outside line L0, which is a public telephone line, via a disconnector G and a protector H, and this telephone exchange A.
A plurality of telephone outlets B are connected to each other by an extension line L1 as a telephone line and a control line L2 as a signal transmission line, and a commercially available telephone C is detachably connected to the telephone exchange A. L1 or extension L
1. By switching and forming communication paths between two telephones, telephone C connected to telephone outlet B can be used to make outside calls and internal calls. In this home telephone exchange system, the doorphone D is connected to the telephone exchange A through the telephone line L3, and the telephone C can be used to make doorphone calls. In addition, in the case of this embodiment, for example, 4DK to 6DK
Even in a house like this, if a telephone outlet B is installed in each room by advance wiring, up to six telephones C can be connected.

Each telephone outlet B is provided with a modular jack (not shown), through which a general commercially available telephone C can be detachably connected. Also, this telephone outlet B is connected to the control line L2.
A speaker for reproducing notification signals such as extension ringing or doorbell ringing sent via the control line L2 and a display signal, which is a voltage signal sent via the control line L2, are used to distinguish between the display signal, which is a voltage signal sent via the control line L2, It is equipped with a light-emitting display section that displays an outside line call, etc., and these speakers and light-emitting display perform notification and display operations.

Hereinafter, the configuration of the telephone exchange A of the home telephone exchange system having the above-mentioned basic configuration will be briefly explained along with its operation. In telephone exchange A, as shown in Fig. 1, relay Ry is connected for each extension L1 to which telephone outlet B is connected.
, and the contact r of this relay Ry connects the internal line L1 and the external line L
0 and supplies a communication current from the communication current supply circuit 4 for an extension call or a doorphone call in a state where the extension line L1 is disconnected from the outside line L0. Note that the contact r of the relay Ry is normally switched to the side that separates the extension line L1 from the outside line L0, and is switched to the side of the outside line L0 when an outside line is received.

[0012] Now, if an incoming outside line is detected by the incoming call detection circuit 5, the control circuit 11 composed of the CPU causes the DC connection circuit 3 to perform DC connection and capture the line. By ringing a built-in bell provided in telephone C, a ringing operation is performed when an outside line call is received. However, in a home telephone exchange system equipped with six telephones C as in the case of this embodiment, all telephones C are connected to the outside line L0 according to technical standards, and the built-in bell is activated in response to an incoming call signal from the central office. There's no way I can make it sound. Therefore,
A pseudo-incoming signal generation circuit 20 is provided which generates a pseudo-incoming signal identical to the above-mentioned incoming signal, and the pseudo-incoming signal generation circuit 2
0 to the extension L1 to which each telephone C is connected, and the built-in bell rings. When the handset of telephone C is picked up in response to this outside call,
The control circuit 11 controls the operation so that the telephone C can make an outside call. Here, the hook/DP detection circuit 2 (however, DP is a dial pulse) detects that the handset of telephone C is picked up in response to the above-mentioned outside call. When it is detected that the handset is picked up and the telephone set C is off-hook, the control circuit 11 drives the corresponding relay Ry to switch its contact r, thereby connecting the extension line L1 to the outside line L0. This allows you to make outside calls. It should be noted that the DC connection circuit 3 releases the DC connection state when the extension L1 to which the telephone C is connected is connected to the outside line L0. The hook/DP detection circuit 2 also has a function of detecting a dial signal based on a DP signal input from the telephone C.

When making an outside call from telephone C, the user picks up the handset and performs a dial operation. In the following explanation, the case where the telephone line contract is a dial pulse line will be explained. The off-hook state of the telephone C is detected by the hook/DP detection circuit 2, and at this time the control circuit 1
1 drives the pseudo dial tone generation circuit 21 to generate a pseudo dial tone similar to the dial tone (two tone (400 Hz)) sent from the telephone office, and sends this pseudo dial tone off-hook through the analog switch network 10. The message is sent to extension L1 to which telephone C is connected. However, the analog switch shown by the square in Fig. 1 can also be used to set the sending path of the pseudo dial tone,
Although related to the switching of other communication paths and signal paths, the explanation of the operation of these analog switches will be omitted in the following explanation. Further, the pseudo beep from the pseudo beep generating circuit 21 is outputted through a filter circuit 23 that transmits a 400 Hz signal. Then, the transmission of the pseudo dial tone is stopped when the hook/DP detection circuit 2 detects the first dial signal.

By the way, in this type of home telephone switching system, call processing such as internal calls is performed by inputting a specific dial signal from telephone C, so even if a dial operation is performed on telephone C, an outside call cannot be made. This is not always the case, and may involve call processing such as making an extension call. Therefore, the control circuit 11 that receives the dial signal starts an outside call operation only when the number of digits of the dial signal exceeds the number of digits of the dial signal allocated for call processing. This outside call is from DP.
This is done by driving the sending circuit 6 and sending a DP signal to the outside line L0. When the other party answers in response to this outside line call, the outside line
Since the polarity of 0 is reversed, this polarity reversal is detected by the polarity reversal detection circuit 16, and then the contact r is switched to connect the outside line L0 to the extension L1 to which the telephone C that made the outside call is connected. Allows for outside calls.

[0015] Here, when making an outside line call as described above, the called party may be busy on a call. Therefore, this home telephone exchange system is equipped with an outside line dial tone detection circuit 8 that detects a dial tone transmitted through the outside line L0, such as a busy tone, and detects a busy tone by this outside line dial tone detection circuit 8. If detected, the control circuit 11 operates the signal tone generation circuit 22 to generate a busy tone (busy tone), and sends this busy tone to the telephone C that made the outside line call.

When making an extension call, a dial signal is input using telephone C in the same manner as in the case of making an outside call. The control circuit 11 determines that this is an extension call from the number of digits in the dial signal, and at this time drives the voice signal generation circuit 22 to connect the phone to the telephone outlet via the control line L2 corresponding to the telephone C of the called party. A call signal is sent to telephone outlet B, and the extension ring tone is sounded from the speaker of telephone outlet B. Then, the hook/DP detection circuit 2 detects that the telephone C on the called side responds and is off-hook, and the control circuit 11 controls the analog switch network 10 to connect the extension L1 corresponding to the telephone C on the calling side. A connection is made to the extension L1 corresponding to the telephone C of the called party, thereby making it possible to make an extension call. Note that when an outside line call or an extension call is being made as described above, the control circuit 11 controls the light-emitting display section of the telephone outlet B with the display control circuit 18 to indicate various types of calls such as an extension call or an outside call. Display. Further, the circuit indicated by the broken line frame A in FIG. 1 is provided in common for each extension line L1 and control line L2. The phototriac FT in the circuit within this broken line frame A is for controlling the sending of a pseudo-incoming call signal, and the amplifier circuit 29 is for amplifying the audio signal sent to the telephone outlet B.

By the way, the above-mentioned extension call is made to a specific telephone C, but if the telephone C to be called is unspecified, it is possible to make a simultaneous call. In this case, the dial signal corresponding to the simultaneous ringing is transmitted to telephone C.
, an extension ring will sound from each telephone outlet B all at once, and if any telephone C goes off-hook in response to this ringing, the control circuit 11 will switch that telephone C off-hook.
In response to the detection output of the hook/DP detection circuit 2 corresponding to the telephone C, the extension L1 corresponding to the telephone C is connected to the extension L1 corresponding to the telephone C of the calling party, thereby enabling an extension call.

Furthermore, this home telephone exchange system is equipped with a hold tone sending circuit 9 which allows a hold operation to be performed and sends out a hold melody tone. In addition, if the telephone line contract is a push-button line, push-button telephone C
Except that the PB receiver 12 detects a dial signal based on a PB (push button) signal from the PB dialer 7 and sends the dial signal to the outside line L0 while the line is closed by the DC connection circuit 3. , operates in the same way as for dial-pulse lines. Note that this DP/PB switching is performed by the setting section 26.

Next, the case where there is a doorbell call will be explained. In the case of this embodiment, two door phones D can be connected, and the door phone monitoring control circuit 14 detects that the push button of the door phone D is pressed, and upon receiving this detection output, the control circuit 11 is the audio signal generation circuit 22
A calling signal corresponding to the doorphone call is sent from the telephone outlet B to each telephone outlet B, and the doorphone ringing tone is sounded at the telephone outlet B. When the handset of one of the telephones C is picked up in response to this doorphone call, the control circuit 11 connects the call line L3 of the doorphone D that made the call and the telephone C that responded.
The extension line L1 of the telephone is connected by switching the analog switch network 10 to enable doorphone calls. Note that the doorphone call is performed via the doorphone call circuit 15. In addition, the door phone D' shown in Fig. 2, which is equipped with a monitor camera that photographs and monitors visitors from indoors, can be connected as the door phone D. In this case, the visitor can be confirmed using the monitor TV unit I installed indoors. can.

Other functions provided by the home telephone switching system will be explained below. In this home telephone exchange system, an emergency push button J or an alarm unit K can be connected, and when the emergency push button J is pressed or an alarm signal is input from the alarm unit K, it is detected by the alarm signal detection circuit 24. In the event that The alarm can be sent to the door phone D, and the door phone D can issue an alarm outdoors. In this embodiment, the alarm is issued from only one door phone D, but the alarm may be issued from both door phones D.

[0021] Furthermore, each of the electric locks N provided on the entrance door where the doorbell D is installed can be connected, and during a doorphone call, the electric lock N can be unlocked from the telephone C that is making the call. When the dial signal is input, the relay R can be driven to unlock each electric lock N. In this way, the home telephone exchange system of this embodiment can be used not only in ordinary houses but also in condominiums and the like.

Furthermore, in the case of this embodiment, a specific extension (
In the following explanation, each extension from a to f in sequence from the top in FIG.
It will be explained as follows. In this embodiment, a facsimile can be connected to this specific extension (which is referred to as extension f). When connecting a facsimile in this manner, a setting is made in the setting section 26 to indicate that the facsimile is connected to extension f (for example, by turning on a switch).

When a facsimile is connected and an incoming call is received while at home, the control circuit 11 gives priority to telephone C to perform the ringing operation, and when the incoming call is for a facsimile, the extensions a to e that received the incoming call are A specific dial signal is input from telephone C (same operation as for the extension call described above), and the call status is transferred to the facsimile of extension f. As mentioned above, when the user is at home, in order to give priority to incoming calls from telephone C by corresponding to extension circuits a to e, first, when an outside line is received, a pseudo ringing signal is not sent to extension f to which the facsimile is connected. .

More specifically, if a facsimile is connected to extension f and a call is received while you are at home,
The control circuit 11 first sends a pseudo incoming call signal to the telephones C corresponding to extensions a to e. As a result, the built-in bell of each telephone C rings to notify that there is an incoming outside call. In response to this call, one of the telephones C is taken off-hook, and if the incoming call corresponds to a facsimile, the user can tell from the ringtone that the call is for a facsimile. Therefore, if the call is for a facsimile, a dial signal corresponding to the extension f to which the facsimile is connected is input. Control circuit 1 receiving this dial signal
1 generates a pseudo paging signal from the pseudo paging signal generation circuit 20 and sends it to extension f to cause the facsimile to automatically respond;
This makes it possible to receive data by facsimile.

Note that when a facsimile is not connected to extension f, the settings of the setting section 26 are canceled, and the control circuit 11 sends pseudo incoming signals to each extension a to f, and transfers the call to the facsimile. function does not work. In other words, extension f can also be used as an extension to which telephone C is connected, like the other extensions a to e. In the above case, the operation was performed when the user was at home, but an answering switch P is provided in consideration of the case where a facsimile call is received when the user is out. The operation state of the absence set switch P is detected by the switch operation detection circuit 27. That is, the switch operation detection circuit 27 applies a voltage to the absentee set switch P, and detects the operating state from the voltage change when the absentee set switch P is operated. When the operation state of the answering switch P is detected, the detection output is sent to the control circuit 11.

When an outside call is received while the answering switch P is set to the out-of-home state, the control circuit 11
is the pseudo incoming signal generation circuit 2 for all extensions a to f.
A pseudo incoming call signal is sent from 0, thereby causing the facsimile to respond automatically. By the way, NTT provides a silent call termination service in its facsimile communication network, and some users wish to receive this service. Therefore, in the case of this embodiment, when the above service is received, the 1
A ring signal detection circuit 28 is provided for detecting a 300 Hz facsimile ring signal. In other words, when a facsimile ringing signal is detected, the pseudo incoming signal detection circuit 20 sends a pseudo incoming signal only to the extension f to which the facsimile is connected, thereby eliminating the need for the user to perform a forwarding operation when he or she is at home. The facsimile can automatically receive calls.

Furthermore, the home telephone exchange system is equipped with a communication device U having the same calling function as the door phone D, and is used for communication between rooms. That is, the communication device U is installed in a washroom, a toilet, a garage, etc., a monitoring control circuit 31 and a communication circuit 32 are provided for the communication device U, and communication between rooms is established in the same manner as in the case of the doorbell D. This is what we do.

In this embodiment, simultaneous broadcasting can be performed from the communication device U and the telephone outlet B, and whether or not to select this simultaneous broadcasting function is set by the setting section 26. Now, if the simultaneous broadcast function is selected, even if the handset of telephone C is not picked up within 30 seconds after the simultaneous ringing tone is sounded from the communication device U and telephone outlet B, the telephone outlet A communication call can be made between B and the communication device U. However, in this case, when the handset of any telephone C is picked up, the extensions corresponding to that telephone C and the telephone C of the calling party are connected, and an extension call state is established.

If the above-mentioned simultaneous broadcasting function is not selected, the above-mentioned simultaneous broadcasting cannot be performed, but in this case, when a dial signal corresponding to simultaneous broadcasting is input, simultaneous calling will be performed to call each extension. It can be used as a function, and when any telephone C answers, it becomes an extension call state. In such a home telephone switching system that allows outside line calls, internal calls, door phone calls, and indoor calls, it is conceivable that the call states may conflict with each other. Therefore, in this home telephone exchange system, priority is set in the order of outside line calls, door phone calls/indoor calls, and internal calls. In addition,
For doorbell calls and indoor communications, priority is given to later arrivals. In addition, if it is multi-functional as described above, the control circuit 11
Since there is a shortage of input/output ports, two input/output port expansion units 30 are used in the telephone exchange A shown in FIG.

By the way, recently, commercially available telephones C
Cordless phones are becoming popular. Therefore, it is conceivable to use this cordless phone in the above-mentioned home telephone exchange system. However, when a cordless phone is used as telephone C in the home telephone exchange system described above, the quick call reception function of this cordless phone (a function that allows you to make calls by simply lifting the cordless part of the cordless phone) cannot be used for internal calls and doorbell calls. . In other words, the quick call function does not work unless an incoming call signal is received, so if an alarm sounds after a few seconds have passed after lifting the cordless part, you must press the button for an external call or an internal call to make an internal call. In the case of a cordless phone, there is a problem in that, like the normal telephone C, it is impossible to make an extension call without having to perform any operations.

Therefore, in this embodiment, whether or not a cordless phone is connected as the telephone C is set in the setting section 26. When a cordless phone is used, after sending an extension call or a doorbell call (a "ping pong" or "pup pup" sound) using the telephone outlet B to each extension, the pseudo ring tone generation circuit 20 is used for each extension L1. Sends out a pseudo incoming signal. However, the transmission time is set to 30 seconds. In this way, even if a cordless phone is used as telephone C, you can make extension calls and doorbell calls by simply lifting the cordless part and without performing any operations.In other words, you can make use of the quick call function of the cordless phone to make extension calls and doorbell calls. . However, if a facsimile is connected to extension f, it is necessary to not send the pseudo incoming signal to extension f to which this facsimile is connected, so that the facsimile does not automatically respond with this pseudo incoming signal. There is. Further, if all telephones C are not cordless phones, no pseudo incoming call signal is sent.

By the way, if both a cordless phone and a normal phone are used as the telephone C, the built-in bell of the normal telephone C will ring unnecessarily and duplicate calls will be made. Therefore, if the setting section 26 is configured so that the extension to which the cordless phone is connected can be specified and set using, for example, a dip switch, and a pseudo incoming signal is sent only to the extension to which the cordless phone is connected, the extension from telephone outlet B can be set. This is preferable because it is possible to prevent the built-in bell of telephone C from ringing unnecessarily after a call or a doorbell call.

The above has been an overall explanation of the home telephone exchange system, but the features of this embodiment will be explained below. In the case of this embodiment, in addition to the above configuration, a power outage detection circuit 34 for detecting a power outage is further provided, and all latching relays are used as relays Ry. Here, in the power failure detection circuit 34, the +27V system of the DC power supply circuit 33 causes a voltage drop first, so a power failure is detected from the voltage drop in the +27V system. However, if the relay Ry can be driven when a power outage is detected, a voltage from another voltage system may be detected. In the case of this embodiment, the memory built in the control circuit 11 always stores the external line L when a power outage occurs.
0 is stored, and the contents of this memory can be changed by inputting a dial on telephone C.

For example, if extension c is an extension that can be used for outside calls even in the event of a power outage, the numbers ``0, 0, 3'' and 3
Enter the digit dialing signal. Upon input of this dial signal, the control circuit 11 stores this dial signal. If you want to change the extension further, select “0, 0,
By inputting the dial signal "0", the control circuit 1
The user only needs to clear the extension stored in No. 1 and input a new dial signal corresponding to the desired extension. In addition, if you set an extension that allows outside calls during a power outage, the above-mentioned determination of an extension call and an outside call will be made only if a dial signal of 2 or more digits is not input within a certain period of time. It is determined that the call is an extension call, and if a dial signal of four digits or more is input, it is determined that the call is an outside call.

In this manner, if a power outage is detected by the power outage detection circuit 34 in a state where an extension line is set to enable outside calls during a power outage, this power outage detection circuit 3
4, the control circuit 11 drives the relay Ry to connect the corresponding extension line L1 to the outside line L0 according to the stored contents. Even if telephone exchange A becomes inoperable after a certain period of time, since a latching relay is used as relay Ry, its extension L1 will be replaced by external line L0.
Therefore, by using the outside line call function that telephone C originally has, it is possible to make an outside line call even during a power outage. In this way, by simply inputting a dial signal, it is possible to easily select the telephone C that enables outside calls during a power outage, and it is possible to select the telephone C that enables outside calls in the event of a power outage.
This has the advantage that it is not necessary to change the wiring to change the .

[0036]

Effects of the Invention As described above, the present invention includes a power outage detection means for detecting a power outage, a storage means for storing an extension line that continues an outside call state in the event of a power outage, and is capable of freely rewriting the stored contents; Since it is equipped with a connection means for connecting an extension line stored in the means to an outside line, in the event of a power outage,
By connecting the extension number stored in the storage means to an outside line, the desired telephone can be made available for calls even during a power outage.
Moreover, by being able to arbitrarily rewrite the memory contents of the storage means, it is possible to change the phone that can be used for calls during a power outage.
This can be done easily without changing the wiring.

[0037]Furthermore, if a rewriting means is provided which allows the stored contents of the storage means to be freely rewritten by inputting a dial signal from a telephone set, and it is possible to change the telephone set with which calls can be made during a power outage by dialing, It is easy to change the phone that can be used for making calls.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a telephone exchange according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a system configuration same as the above.

[Explanation of symbols]

A Telephone exchange C Telephone L0　　External line L1 extension 11 Control circuit 34 Power outage detection circuit Ry relay

Claims (2)

[Claims] Claim 1: Consisting of at least a telephone exchange connected to an outside line, which is a public telephone line, and a plurality of commercially available telephones connected to this telephone exchange by extensions, the telephone exchange can connect outside lines and extensions, or between extensions. In a home telephone switching system that switches and forms communication paths to enable external and internal calls using the telephone, a power outage detection means for detecting a power outage and an extension that continues an external call state in the event of a power outage are stored; A home telephone exchange system comprising: a storage means whose stored contents can be freely rewritten; and a connection means for connecting an extension line stored in the storage means to an outside line in the event of a power outage. 2. The home telephone exchange system according to claim 1, further comprising a rewriting means that allows the stored contents of the storage means to be rewritten by inputting a dial signal from a telephone set.