JPH047876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to telephone equipment, and more specifically, to prevention of failures due to duplication of telephone numbers that occur when a telephone equipment is delivered or when a terminal telephone is added.

Conventional devices of this type, such as button telephone devices, are installed with an extension telephone number set in advance at the time of delivery, or when installed on each desk or in each room, the extension telephone number is set. In this case, if a duplicate phone number was accidentally set after setup, the duplicate phone would simply become unusable and no message would be displayed, so I was wondering if the cause was due to duplicate phone numbers or something else. It was difficult to determine whether it became unusable due to this. As a result, there have been cases in which failures have been reported during the delivery or after installation of the device, and problems have arisen in which good products may be returned as defective.

(Objective of the Invention) In order to solve these drawbacks, the present invention makes it easy to identify duplicate telephones by flashing their lamps, displaying the telephone number on the display, and emitting sound from the speaker. To provide a telephone device that can prevent failures during delivery and reduce defects during delivery.

(Structure of the Invention) To achieve this object, the telephone device of the present invention has a main device and a plurality of terminal telephones interconnected by a connection line, and a telephone number is set for each of the plurality of terminal telephones. The telephone number corresponding to the setting state of the switch is preset,
Frame synchronization is established between the main device and the plurality of terminal telephones, and data of each terminal telephone with the telephone number determined to correspond to each time slot of each frame is allocated and transmitted, and data is transmitted to each terminal telephone. is configured to receive and detect the data of the time slot corresponding to the set telephone number, and check data among the data transmitted from each terminal device to the main device and the data registered in advance in the main device. The configuration is configured so that it is determined to be normal by comparing it with the fixed data that exists.
When the device is turned on or when the device is in operation and one of the plurality of terminal telephones is connected to the main device by the connection line, the normal condition is detected in any of the time slots. If the data to be determined is not detected, it is determined that the same telephone number is duplicated in multiple terminal telephones among the plurality of terminal telephones, and the corresponding telephone number is handled accordingly. The terminal telephone is configured to display the telephone number in a visible or audible manner.

The present invention will be explained in detail below.

(Example) Normally, telephone number settings are often carried out by a construction worker at the installation site based on a user's request. In this case, the person in charge of construction must set the telephone number for each telephone by operating a digital switch or the like provided in the telephone.

FIG. 1 is a block configuration diagram showing an embodiment of the present invention, in which No. 1 TEL is a telephone set to telephone number "1", and No. 2 TEL is a telephone set to telephone number "1" by mistake. , No.3TEL is a phone set to phone number "3", No.4TEL is a phone set to phone number "4", No.5TEL is a phone set to phone number "4" by mistake, and ME is a phone set to phone number "4". It is the main device.

Figure 2 shows the main device ME and telephones No.1TEL to No.N.
This shows the format of signal transmission between TEL and TEL. Following the synchronous data CD, a signal arrangement is adopted in which data is exchanged with each of the telephones No. 1 TEL to No. N TEL. Telephone No.
1TEL~No.N Data transmitted via the data line L between the TEL and the main device ME is sent from the data transmitting/receiving circuit ME-A to the telephone No. 1 under the control of the microcomputer ME-B of the main device ME. .1～No.N
Control data MD to TEL's data transmitting/receiving circuits 1A-NA and telephone No. 1 to No.N From data transmitting/receiving circuits 1A to NA to main device ME's data transmitting/receiving circuit ME under the control of TEL's microcomputers 1B to NB. - Consists of control data TD to A, and transmission check data MC at the end of each control data.
Alternatively, TC is added, and by examining the transmission check data and control data, it is possible to determine whether the transmitted data is normal.

If you turn on the power to the main unit ME with telephones No. 1, 2, 3, 4, and 5 TEL connected, the main unit ME will turn on according to the format shown in Figure 2.
Data transmission is started between the ME and each telephone No. 1, 2, 3, 4, and 5 TEL. However, the phone
Since No. 1 and No. 2 TEL are set to the same number "1", telephone No. 1 and No. 2 TEL are set to the same number "1".
Data transmission is performed in a time slot of 1 TEL. This is because telephone No. 1 TEL and telephone No. 2 TEL are set to the number "1", so the microcomputer CPU 15 of the telephone is configured to detect the time slot data of telephone No. 1 TEL.
This is because -1 and 15-2 operate. Telephone No.
With 1TEL, when you perform some kind of operation, such as lifting up, information is generated to the main device ME, and the telephone
This information is set in the control data TD sent from No. 1 TEL to the main device ME, and transmission check data TC is created and transmitted to the main device ME. However, since the time slot of telephone No. 2 TEL with the incorrect number setting is also the same as that of telephone No. 1 TEL, telephone No.
The control data TD and transmission check data TC created in the 2nd TEL are simultaneously transmitted to the main device ME in the time slot of the No. 1 TEL. Here, in the time slot of No. 2 TEL, the telephone No. is sent from the main device ME.
Control data MD to 2TEL is sent, but control data TD and check data TC from telephone No. 2TEL are not transmitted. Therefore, the telephone
The data of No.1 TEL and the data of telephone No.2 TEL are
It is mixed in the time slot of No.1 TEL, and the main device
Looking at the data that has arrived at the ME, both the control data TD and the transmission check data TC are abnormal data at the time slot of No. 1 TEL, and as a result of the data check in the microcomputer ME-B, a transmission error occurs. In addition, the control data TD and check data TC of the time slot of No. 2 TEL are the main device.
Since the data is not transmitted to the ME, the microcomputer ME-B of the main device ME cannot determine that the data in the time slot of No. 2 TEL is normal, resulting in a transmission error. If an error occurs in the data in the main device ME, the telephone number where the error occurred, ie "1" in this case, will be displayed on the LCD display 1 of the telephone No. 1, 2 where the number is duplicated.
At the same time as sending the data as shown in C and 2C, send retransmission request data using the time slot of telephone No. 1 TEL, requesting that the same data be sent until the erroneous part is repaired and the transmission error disappears. . Even if telephone numbers 1 and 2 are unusable, if data from the main device ME can be received normally, this data will be processed.
Display the phone number "1" where the error occurred on the LCD display. Also, in response to a retransmission request, the same data as the previous time is transmitted to the main device ME. Therefore,
LCD display 1 of telephone No.1TEL and No.2TEL
"1" is displayed in C and 2C, and it can be determined that the failure has occurred due to duplication of telephone numbers. Also, in the time slot of telephone No. 2 TEL, control data MD is sent to display telephone number "2" as a result of a transmission error determined as described above, but in this case, telephone No.
Since 2TEL is set to "1", there is no telephone that detects reception of the control data MD that displays "2". If a telephone number is displayed on the LCD display and no other telephone has the same number displayed, this telephone is considered to be at fault. Therefore, if you check two telephones with the same number and find that there is an error in the number setting of No. 2 TEL, operate the telephone number switch of No. 2 TEL and change the telephone number from "1" to "2".
By resetting the settings to , the phone No.1TEL and No.
2TEL can be formed to work properly.

Additionally, if you set telephone No. 5TEL to number "4" and connect while the device is operating, that information will be sent to the main device ME and telephone No. 4TEL and No. 5TEL will become unusable, but the LCD display "4" is displayed in 4C and 5C, and it can be determined that the problem is caused by the duplication of phone numbers 4 and 5.
By resetting the number of telephone No. 5TEL from "4" to "5", it will work normally.

FIG. 3 is a block diagram of a key telephone system showing a specific embodiment of the present invention, and shows a multi-drop wiring type key telephone device.

1 and 2 are office lines, l ₁ and l ₂ are communication lines, l ₃ is data line,
3a and 3b are station line state detection circuits 3 composed of photocouplers; 3a is a light emitting side equipped with light emitting elements _PC1 to _PC4 ; and 3b is a light receiving side equipped with light receiving elements _PC1 ' to _PC4 '. , the light-emitting element PC ₁ and the light-receiving element PC ₁ ' are each paired, and the same is true for the others.
t ₁ to _{t 3} are main device ME side terminals, t ₁ ′ to _{t 3} ′ are button telephone TEL side terminals, 4 is main computer CPU, 5 is read-only memory ROM, 6 is random access memory RAM, K ₁ , K ₂ is a hold trunk switching relay, k ₁ and k ₂ are its contacts, R ₁ and R ₂ are the office line, and extension selection relays are r ₁ and r ₂ are their contacts, 7 and 8 are hold trunks, and 9 and 10 are extensions. Call current supply circuit, 11
12 is a data transmission circuit that is connected to the main computer (CPU) 4 via a data bus and transmits data between the telephone side and a data line _L3 on the telephone side.
Phone power supply circuit that supplies power through the BL
is a data line, Cl is a control line, dl is a common bus including address bus and data bus, 13-1,1
3-2 is a data transmission circuit on the telephone side, 14-1,
14-2 is the telephone power supply circuit 10 of the main device ME.
The power transmitted from the data transmission circuit 13-1,
15-1 and 15-2 are sub-computers, and 18-1 and 18-2 are multiple power supply separation circuits for selecting lines and various functions. A function selection switch KEY containing a push button switch, P ₁ and P ₂ are path selection relays, p ₁ and p ₂ are their contacts, and Q ₁ and Q ₂ are used to select a communication path or disconnect the communication path to enter a confidential state. 19-1, 19-2 are switch switches, 20-1, 20-2 are communication circuits, 21-1,
21-2 is the display section, Cl ₁ and Cl ₂ are the control lines,
dl ₁ and dl ₂ are common buses including an address bus and a data bus.

Next, the operation will be explained.

Various information from each button telephone No.1TEL to No.nTEL, that is, on-hook and off-hook information,
The function information etc. obtained by operating the various function selection switches 18-1 to 18-n are transferred to the data line as digital data based on a predetermined format shown in FIG.
l ₃ to the main device ME. Main device ME
In addition to these data, various information generated within the main device ME, including incoming call information from the central office line,
The main computer (CPU) 4 is configured to grasp the status of the entire system, including various functional information such as service class setting information and long-term call alarm information, and to control each part. Between the main computer 4 of the main device ME and the data transmission circuit 11, and the sub-computer 1 of each button telephone No. 1 to No.nTEL
5-1 to 15-n and data transmission circuits 13-1 to 1
Data lines bl and bl ₁ to _{bl o} for transmitting various data and control lines cl and cl ₁ to cl _o for transmitting control signals are arranged between 3 and n. ) 5 and random access memory RAM 6 each button phone number 1
~ Various control data is exchanged with No.nTEL.

First, in the case of a central office line call, for example, key telephone number.
When 1TEL raises the handset to make a call to the central office line, the hook switch HK 19-1 operates and the off-hook information is taken into the subcomputer (CPU) 15-1. These data are transferred to data transmission circuit 1
3-1, the data is input to the data transmission circuit 11 of the main device ME via the data line _l3 , and is transmitted to the main computer (CPU) 4. Next, when the function selection switch KEY 18-1 corresponding to the No. 1 central office line is pressed, the key selection information is similarly taken into the subcomputer (CPU) 15-1 of the key telephone No. 1 TEL.
The main computer (CPU) 4 accepts this information and relays the call path selection to the button telephone No. 1 TEL.
P ₁ transmits data to operate secret relay Q ₁ . As a result, the secondary computer (CPU) 1
5-1 operates the communication path selection relay P ₁ and connects its contact p ₁ to the state shown (terminal t ₁ ' side) to the vacant communication path L ₁ side, and operates the confidential communication relay Q ₁ to select the Connect contact q ₁ as shown in the dotted line (terminal t ₁ ' side).

In addition, the main computer (CPU) 4 of the main device ME
is a hold trunk switching relay due to off-hook information.
_K1 is operated to connect and hold the contact _k1 in the solid line state as shown, and the key selection information connects the contact _r1 of the central line/extension line selection relay _R1 to the solid line state as shown in the figure.

Therefore, the call circuit 20 of key telephone No. 1TEL
-1 is connected to No. 1 office line 1 via communication path l ₁ , contact r ₁ , contact k ₁ , and office line state detection circuit 3a. Next, the telephone number of the other party is dialed, and if the other party answers, the telephone call circuit 20-1 performs a telephone call to the central office. When the key telephone No. 1 TEL is turned on due to the end of the call, the switch (HK) 19-1 is restored, the off-hook information is transmitted, and each part is reset.

FIG. 6a is a flowchart showing the operation in the case of a central office line call.

On the other hand, to explain the case of incoming calls on the central office line, for example, when there is an incoming call on the No. 1 central office line and an incoming signal arrives, PC ₁ on the light emitting side 3a of the central office line incoming detection circuit 3,
PC ₂ emits light, PC ₁ ′ and PC ₂ ′ on the light receiving side 3b receive the light, and the received light output is sent to the main computer (CPU) 4.
The main computer (CPU) 4 detects that there is an incoming call on the No. 1 office line, and sends the incoming office line information to each button telephone No. 1 TEL to No. n TEL via the data line _L3 . Transmit. Each button telephone number.
For 1TEL~No.nTEL, subcomputer CPU15-
1 to 15-n output corresponding data based on the incoming call information on the central office line, and a ringing means (not shown) is controlled to emit a ring tone, and a display means corresponding to the No. 1 central office line is displayed on the display means. Part 21-
1 to display an incoming call on the central office line, for example, by flashing.

If key telephone No. 1 TEL responds, raise the handset and press the function selection switch (KEY).
Press 18-1 to switch the hook switch (HK) 19.
-1 transmits the activated off-hook information and key selection information to the main computer (CPU) 4. As a result, the main computer (CPU) 4 transmits this information to the acceptance button telephone No. 1 TEL so as to operate the communication path selection relay P ₁ and the privacy relay Q ₁ . As a result, the secondary computer (CPU) 15
−1 operates the communication path selection relay P ₁ and its contact p ₁
is connected to the state shown in the figure (terminal t ₁ side), and the secret relay Q ₁ is operated to connect its contact q ₁ as shown by the dotted line (terminal t ₁ ' side). In addition, the main computer (CPU) 4 is a hold trunk switching relay in the main device.
_K1 is operated to connect the contact _k1 to the solid line state as shown in the figure, and the contact _r1 of the office line/extension line selection relay _R1 is kept in the solid line state as shown in the figure, so that the communication circuit 20-1
is inserted into the communication path _l1 , resulting in a response state. As a result, the light emission (blinking) corresponding to the incoming signal interval of 6 Hz of the light emitting element PC ₁ inserted in the No. 1 station line changes to a lighting state, and the information is transferred from the main computer (CPU) 4 to the sub computer. (CPU) 15-1 is also taken in, and the display section (not shown) corresponding to the No. 1 station line changes from a blinking state to a lighting state. At the same time, the station line ringtone from the speaker means (not shown) also stops ringing.

If you want to transfer the central office line to another key telephone after answering the call, or if you want the other party to temporarily wait, press the hold function switch (not shown) among the function selection switches. The information is taken into the main computer (CPU) 4, and the hold trunk switching relay _K1 is activated to switch to the hold trunk 7 side, so the No. 1 station line can be placed on hold, and a hold tone (not shown) is sent. The circuit sends a melody or the like indicating that it is on hold to the other party.

Further, when the aforementioned hold function switch of the function selection switch KEY of key telephone No. 1TEL is pressed again, the hold operation is canceled and the telephone returns to the original central office line path state.

For internal calls, for example, key phone number.
To explain the case in which TEL 1 calls key telephone No. 2 and makes a mutual call, first, when TEL 1 raises the handset, the telephone switch (HK) 19-1 operates and goes off-hook in the same way as when calling from a central office line. Information is also transmitted to the main computer 4 to bring the contact _k1 into the illustrated state. Next, when the function selection switch (KEY) 18-1 corresponding to extension No. 1 is pressed, the key information is transferred to the subcomputer (CPU) 15.
-1, and sets the contact p ₁ to the state shown in the figure (terminal t ₁ ' side) to select communication path l ₁ (corresponding to No. 1 office line), and sets the contact q ₁ to the dotted line state (terminal t ₁ ' side). ). The key selection information is transmitted to the main computer (CPU) 4 and operates the office line/extension selection relay _R1 .
Switch the contact _r1 like a contact. As a result, the extension current supply circuit 9 is connected to the communication path _l1 . Continue to use key telephone number, which is the extension calling party.
1TEL dials the extension number of the called party's button telephone No. 2TEL and calls it by a calling means (not shown), and displays a call display on the display 21-2. In order to respond to this, the number corresponding to the call display is displayed. .1 extension function selection switch (KEY) 18-
When you press 2 to off-hook, the key selection information connects contact p ₂ to the solid line state (terminal t ₁ ″ side) as shown in the figure, and contact q ₂ also switches to the dotted line side (terminal t ₁ ″ side), so the call line l ₁ , the communication circuits 20-1 and 20 between the two parties
-2 allows for inter-extension calls.

When the call ends, each part is reset by the on-hook information.

Next, the operation when an incoming call is received during an extension call will be described. The operation flow is as shown in FIG. 6b.

For example, as mentioned above, when key telephones No. 1 TEL and No. 2 TEL are communicating between extensions using the communication path L ₁ on the No. 1 office line side, the office line/extension line selection relay R ₁ is activated. The extension call current supply circuit 9 is captured. In button telephones No. 1TEL and No. 2TEL, communication path selection relays P ₁ and P ₂ operate, and their contacts p ₁ and p ₂ are connected to communication path l ₁ .

In such a state, when there is an incoming call on the No. 1 office line and an incoming signal arrives, the light emitting elements PC ₁ and PC ₂ on the light emitting side 3a of the office line incoming detection circuit 3 emit light.
The light emitting elements PC ₁ ′ and PC ₂ ′ on the light receiving side 3b receive light and send the received light output to the main computer (CPU) 4, so the main computer (CPU) 4 detects that there is an incoming call on the No. 1 office line. . The main computer (CPU) 4 accordingly detects an empty communication path, for example, _l2 , activates the corresponding office line/extension line selection relay _R2 , and switches the contact _r2 to the line state. An extension current supply circuit 10 is connected to the communication path _l2 so that power for communication can be supplied. at the same time,
Detection information that there is an incoming call on the No. 1 office line and designation information that the free call path is L ₂ are also transmitted to the key telephones No. 1 TEL and No. 2 TEL via the data line L ₃ . . Push-button telephone number during mutual extension call.
In TEL 1 and TEL No. 2, based on this information, sub-computers (CPUs) 15-1 and 15-2 operate call path selection relays P ₁ and P ₂ , respectively, and change the contacts to the dotted line side (terminals t ₂ ′, t ₂ ″ side).

This allows the button telephone No.1TEL, No.
Although the 2TEL is instantly reconnected to the communication path _l2 , the extension communication is maintained without failure due to the communication current supply from the extension communication current supply circuit 10 of the main device ME.

In addition, when the main computer (CPU) 4 detects that the contacts p ₁ and p ₂ of the key telephones No. 1 TEL and No. 2 TEL are switched and the communication line l ₁ becomes an empty line, the main computer (CPU) 4 switches the central office line/extension line selection relay R. ₁ and its contact r ₁
Return to solid line state. As a result, the No. 1 station line becomes a communication route.
It is connected to the terminals t ₁ ′, t ₁ ″...t ₁ ⁿ of each of the button telephones No. 1 TEL to No. n TEL via l ₁ .

On the other hand, the office line incoming signal is detected by the main computer (CPU) 4 via the office line incoming detection circuit 3, and the detection information is sent to each button telephone number No.1TEL to No.nTEL.
, and is displayed visually and audibly, so any key telephone number other than key telephone number 1 TEL and number 2 TEL that are communicating between extensions via communication path _L2 .
You can respond appropriately to 3TEL to No.nTEL.

In this way, while key telephones No.1TEL to No.nTEL are talking between extensions using the communication path _l1 or _l2 provided corresponding to the accommodation station line No.1 or No.2, When a call arrives on the relevant station line No. 1 or No. 2, the station line No. 1 or No. 2 with an empty value is immediately
Select the call route L ₂ or L ₁ corresponding to It is configured to be used as a switch.

The present invention is not only configured to switch the connection when a call is received from the central office line, but also when another key telephone uses the communication path used for inter-extension calls to make a call to the central office line. In some cases, the communication path is configured so that it can be used as a connection path to connect to the central office line while switching the connection from that communication path to another communication path and maintaining inter-extension communication between the two parties. There is.

Figure 6C shows the switching detection status of the central office line and extension line in RAM.
6 is a flowchart illustrating the operation when registering.

In addition, when the number of communication paths of the present invention is larger than the number of station lines accommodated, in this case, it is possible to use many communication lines for constant internal calls, and it is possible to receive calls from the central office line on any of the communication lines. can be received and can be switched. The present invention is applicable even when the number of station lines accommodated is one.

The number of office lines accommodated is the same when the number of communication routes is the same, and in this case, the normal usage pattern is that the office line and extension line can be used on a one-to-one basis.

If the number of communication routes is less than the number of telephone lines accommodated, in this case, more emphasis is placed on telephone calls on the telephone lines, but inter-extension calls will be limited.

The present invention can also be applied to the above cases.

FIG. 4 shows a specific embodiment of the data transmission circuit 11 and the telephone power supply circuit 12 according to the present invention. The power supply circuit 12 also includes a constant voltage circuit and can be configured extremely easily.

Furthermore, the data to the CPU 4 can be simply a DC level of "high" or "low", making the circuit configuration extremely simple.

FIG. 5 shows a specific embodiment of the extension power supply circuit 9 or 10. Since the base-emitter path of the transistor Tr ₂ and the impedance of the diode D ₁ are made equal, R ₅ The flowing current is D ₂ /R ₅ = I _c , and it is simply the resistance R5.
This is a circuit that can determine the telephone supply current _Ic with a single circuit.

Next, as explained in Figure 1, button telephone No.
A case where 1TEL and No.2TEL are set to the same extension telephone number "1" will be explained.

According to the format shown in FIG. 2, data transmission is started between the main device ME and each of the key telephones No. 1 to No. nTEL, that is, between the data transmission circuits 11 and 13-1 to 13-N. 1TEL and No.
Data transmission for TEL 2 will be performed in the time slot of TEL No. 1. For example, for sending
When No.1TEL performs a hook-up operation, the main device
Information to the ME is generated, and from No.1 TEL the main device ME
This information is set in the control data TD to the main device ME, and transmission check data TC is created and transmitted to the main device ME. Similarly, the control data TD created at No. 2 TEL with the wrong number setting and the check data TC transmitted to "1" are simultaneously transmitted to the main device ME in the time slot of No. 1 TEL, and the main device ME .1TEL and No.2TEL data are mixed in the No.1TEL time slot, so the main computer
Data corresponding to values calculated by the CPU 4 according to a specific algorithm (for example, addition in 4-bit units) from control data determined to correspond to various types of control operations is stored in the ROM 5 as fixed data in advance. This fixed data and the check data TC are compared, and if they are different, it is determined that the data is abnormal, resulting in a transmission error. Also, since the control data TD and check data TC of the time slot of No. 2 TEL are not transmitted to the main device ME, the microcomputer ME-B of the main device ME recognizes that the data of the time slot of No. 2 TEL is normal. It cannot be determined that this is the case, resulting in a transmission error.

When the main computer CPU4 of the main device ME detects such an error, it displays the telephone number "1" in which the error has occurred and the data displayed on the display sections 21-1 and 21-2 of No.1 TEL and No.2 TEL. The data transmission circuit 11 is controlled to transmit the data. The data transmission circuit 11 transmits corresponding data to the data transmission circuit 13-1 based on the command from the main computer CPU4.
At the same time, the retransmission request data is sent to No. 13-2.
Send in 1 TEL time slot. No.1 and
On the No.2 TEL side, this data is transferred to the subcomputer 15.
-1 and 15-2, the command causes the display units 21-1 and 21-2 to display the telephone number "1" based on this data.

In addition, the control data MD is set to display the telephone number "2" as a result of determining that there is a transmission error in the time slot of telephone No. 2 TEL as described above.
is sent, but in this case, telephone number 2 TEL is "1"
Therefore, there is no telephone that detects reception of the control data MD that displays "2".

Therefore, it can be seen that the problem is caused by the duplication of telephone number "1".

The operations of the computer ME-B and the CPU 4 in the error display described in FIGS. 1 and 3 will be explained in more detail with reference to the flowchart in FIG. 7.

When you turn on the power now, each part is reset (step 1), and then the synchronization data CD is transmitted from the main device ME to each telephone No. 1 TEL to No. n TEL (step 2), and synchronization is achieved all at once. . No.nTEL in order from transmission No.1TEL from the main tension device ME
Send data up to. That is, first the phone
No.1TEL, main device ME for telephone No.1TEL
Control data MD and check data MC are sent from the main device ME to telephone No. 2 TEL, and then the control data MD and check data MC from the main device ME to telephone No. 2 TEL are sent to telephone No. ). After that, telephone number 1TEL
The main device ME receives control data TD and check data TC from the telephone side in order from No.nTEL to No.nTEL (Step 4). Next, it is checked whether data has been imported from all phones (step 5), and when completion is confirmed, the data from each phone is stored in the ROM in advance.
The fixed data stored in 5 and telephone number.
The data is compared sequentially starting from 1TEL and checked to see if there are any errors in the transmitted data (Step 6). If there is no error (step 7), the data of the next telephone is checked, but if an error is detected (step 7), the telephone (N) where the error was detected is set to a transmission error. Then, the transmission error is processed (for example, the telephone is disconnected) (step 8), and the completion of the check for each telephone 1 to N is thus confirmed (step 9). Next, as a result of the check, if there is no error in the data for each telephone (step 10), new data for the telephone is created (step 11). If there is an error in the data for each telephone (step 11), data for displaying the error for each telephone is created (step 12). Thereafter, it is checked whether all telephones have completed the process (step 13), and if the process has been completed, the system is configured to move on to the data transmission of the next frame.

The above description has been made regarding the case where the error display is performed on the LCD display, but it is also possible to perform the error display by lighting or blinking a lamp. It is also possible to display the error by outputting sound from a speaker.

(Effects of the Invention) As explained above, according to the present invention, duplication of telephone numbers can be easily determined, thereby preventing failures during delivery and after installation, and eliminating the need for normal telephones to be treated as defective products. There is an advantage.

[Brief explanation of drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention, FIG. 2 is a format showing an example of signal transmission used in the present invention, FIG. 3 is a block diagram showing a specific embodiment of the present invention, and FIG. 5 and 5 are circuit diagrams showing specific examples of circuits used in the present invention, and FIGS. 6a, b, c, and 7 are flowcharts showing the operation of the present invention. No.1, No.2, No.3, No.4, No.5TEL…Telephone
No.1 to No.5, ME...Main device, 1A, 2A, 3A,
4A, 5A, ME-A...Data transmission/reception circuit, 1
B, 2B, 3B, 4B, 5B, ME-B microcomputer CPU, 1C, 2C, 3C, 4C,
5C...LCD display, ME-C...memory, 1
...No.1 office line, 2...No.2 office line, 3...office line incoming detection circuit, 3a...3 light emitting side, 3b...3 light receiving side, 4...
Main computer, 5...Read-only memory, 6
... Random access memory, 7, 8... Holding trunk, 9, 10... Extension call current supply circuit, 11, 1
3-1, 13-2...Data transmission circuit, 12...Telephone power supply circuit, 14-1, 14-2...Power separation circuit, 15-1, 15-2...Subcomputer, 1
8-1, 18-2...Function selection switch, 19-
1,19-2...Full switch, 20-1,20
-2...Telephone circuit, 21-1, 21-2...Display section,
60, 65... Call route selection relay, 61, 66... Office line/extension line selection relay, 62, 67... Confidential communication relay,
63, 68...Speech circuit network, 70, 71...Button telephone, _l1 , _l2 ...Speech line, _l3 ...Data line, bl...Data line, cl...Control line, _cl1 , _cl2 ...Control line, dl , dl ₁ , dl ₂ ... Common bus, P ₁ ... Call path selection relay, Q ₁ ... Confidential communication relay, K ₁ ... Hold trunk switching relay, R ₁ , R ₂ ... Office line/extension line selection relay,
PC ₁ , PC ₂ , PC ₃ , PC ₄ ...Light emitting element, PC ₁ ′, PC ₂ ′,
PC ₃ ′, PC ₄ ′...Photodetector.

Claims (1)

[Claims] 1 The main device and a plurality of terminal telephones are interconnected by a connection line, and each of the plurality of terminal telephones is preset with a telephone number corresponding to the setting state of a switch for setting the telephone number. Frame synchronization is established between the device and the plurality of terminal telephones, and data of each terminal telephone having the telephone number determined to correspond to each time slot of each frame is assigned and transmitted, and each terminal telephone The device is configured to receive and detect data in a time slot corresponding to a telephone number set in the terminal device, and check data among the data transmitted from each terminal device to the main device and fixed data registered in advance in the main device. The device is configured to compare data and determine that it is normal, and when the device is turned on or while the device is in operation, one of the plurality of terminal telephones is connected to the When connected to a device, if the data determined to be normal is not detected in any of the time slots, the same telephone number is duplicated in multiple terminal telephones among the plurality of terminal telephones. a telephone device configured to determine that the duplicate telephone number has been set, and to display the telephone number by a visible display or an audible display on the terminal telephone corresponding to the duplicate telephone number.