JPS6041917B2 - Call restriction method for button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for making and receiving calls in a button telephone device that accommodates a central office line from a central office and a plurality of key telephones (hereinafter referred to as telephones), and that performs exchange connections between the central office line, telephones, and each other. It concerns the regulatory method.

The conventional button telephone device consists of a main device mainly consisting of a relay circuit, and a telephone having a mechanical lock button connected to the main device through a large number of indoor wires. Accordingly, the connection between telephones or the central office line is selected, and calls can be made and received via the central office line via the main device, or calls can be made between the telephones by receiving power for communication from the main device. ,
In most cases, the main device had only the function of connecting to the central office line and the function of supplying power for telephone calls, and did not have complete switching functions.

Therefore, the number of wires for each telephone increases, which increases the number of installations and makes maintenance and inspection difficult.
Since the main device consists of a relay, it is large and has poor reliability.In particular, it is not easy to restrict incoming and outgoing calls to a specific telephone; However, the drawback was that it was difficult to set and change settings.

The present invention aims to eliminate all of the above-mentioned drawbacks of the conventional art at once.The present invention has an object of solving the above-mentioned drawbacks of the conventional art at once. A plurality of terminal units that transmit and receive data signals to and from telephones via lines, an exchange connection circuit that performs exchange connections between voice lines connected to each terminal unit and external lines housed in the line unit, and a line unit. and a main control unit equipped with a processor that controls each predetermined unit and exchange connection circuit according to information from the terminal unit,
It corresponds to the external line and corresponds to each of the line buses and telephones that send output to the main control unit, and the telephone can be specified from the main control unit. A call restriction unit is provided in which a series circuit of a diode and a manual setting switch corresponding to each button telephone is inserted at each intersection with the telephone busbar to which a signal is given, and the main control unit specifies the telephone busbar and then outputs the telephone designation signal. Based on the output of the line bus according to the ON/OFF state of the manual setting switch according to the connection status setting between the external line and the button 5 telephone, the external line corresponding to the line bus for the telephone corresponding to the specified telephone bus This invention provides a call restriction method for a button telephone device, in which the main control unit determines whether to restrict calls by line and controls the connection of an external line to the telephone, making it extremely easy to set and change call restrictions. .

Figure 1 is a block diagram of the entire system, in which central office lines SLl to SLm from the telephone office as external lines are individually connected to central office line units SLUl to SLUm as line units, and only voice signals are separated. is applied in parallel to each terminal unit TEUl to TEUn, and the terminal unit T
Exchange connections are made with a plurality of telephones MFTl-MFTn via crosspoints within EUl-TEUn. In addition, the terminal units TEUl to TEUn
Link circuits L1 to Lp are provided between them, and the telephones MFTl to MFTn are connected to each other via the aforementioned cross points.
Mutual exchange connections are also possible. Note that the terminal units TEUl to TEUn and the telephones MF'T1 to MFTn
are connected to each other by a four-wire system consisting of a pair of voice lines V[4 to VLn and data lines DLl to DLn, respectively, terminal units 'VEUl to TEUn and telephones MFTl to Tn. Audio signals and data signals in the form of FS signals (frequency shift signals) are transmitted and received via line transformers installed at Power is supplied from the terminal units TEUl to TEUn to the telephones IVF'T1 to MFTn through a neutral point provided in the terminal unit.

In addition, main control unit MCU1 station line unit SLU
l~SLUm and terminal units TEU, ~TEUn are equipped with a processor such as a microprocessor, and the processors of terminal units 'IEUl~TEUn decode and hold the transmission information etc. from the telephones MFTl~MF'Tn. , decodes and holds the incoming call information etc. given from the main control unit MCU, and transmits the incoming call information etc. to the telephones MFTl to MFT according to instructions from the main control unit MCU.
At the same time, transmission information etc. are sent to the main control unit MCU.
The main control unit MCU checks the outgoing information etc. from the terminal units TEUl to TEUn and the incoming information etc. from the office line units SLUl to SLUm, and also checks the setting information of the outgoing/incoming call regulation unit 0AD. After checking the command information based on these, the command information is sent to the station line units SLUl to SLUm and the terminal unit TEU.
1 to TEUn, and controls the exchange operation of the entire system. On the other hand, the telephones MFTl to R8'Tn are equipped with the required number of non-locking button switches and indicator lights, and are equipped with a dial for making a call to the central office line, as well as a telephone circuit and a buzzer or bell for notifying an incoming call. Furthermore,
It has a processor and a MODEM (modulator/demodulator), and the processor decodes the information generated by button switch operations and the dial information by dial operations, and then outputs MODEM.
While controlling EM and sending it out as a data signal, MODE is also provided in terminal units TEUl~'VE, Un.
Receive the data signal from M by its own MODEM,
A processor decodes the received output and lights up an indicator light, rings a buzzer or bell, etc.

FIG. 2 is a block diagram of the station line units SLUl to SLUm, in which a signal detection circuit DET using a diode bridge circuit, a photocoupler, etc. detects a calling signal, and provides this as incoming call information to the processor CPUs. At the same time, the relay HS is operated under the control of the processor CPUs, and when its contact Hs is turned on, a loop circuit is formed via the primary winding of the line transformer LTs.At the same time, the relay HS is operated under the control of the processor CPUs. According to the operation and recovery of the relay HS, the contact Hs is turned on and off, and a dial pulse is also sent out.

FIG. 3 is a block diagram of the terminal units πU1 to TEUn, in which the voice line VL from the telephone MF'T is connected to the central office line units SLU1 to SLUm via a line transformer LTv and a cross point CP as a switching connection circuit. The cross point CP is connected to the main control unit M
It is turned on in response to control from the CU, thereby establishing a predetermined exchange connection.

Further, the data circuit DL from the telephone MFT is connected to the MODEM-MDM via a line transformer LTd, and is controlled by the processor CPUs.
While the MDM sends data signals as FS signals using audio frequencies, the FS signals from the telephone MF'T are sent as MOD
After demodulating the EM-MDM into a data signal, the processor C
It is intended to be given to PUt.

Figure 4, station line unit SL by main control unit MCU
Ul~SLUm and terminal units TEUl~TEUn
Exchange of information with the same unit TEUl~TEUn
This is a time chart showing the information exchange operation between the telephones MFTl to MFTn, and first, each unit SLUl to S
If there is no incoming/outgoing information on the LUm and TEUl to TEUn sides, even if the main control unit MCU sends out a polling signal to start checking, the polling signals will be sent to each in turn as no information is retained. Units SLUl~SLUm. ．． The check is completed by only transmitting data to TEUl to TEUn, and at the end of the check, the main control unit MCU gives a command to start sending out Gate 7 U '2 to the terminal units TEUl to TEUn. TEUl-TEUn simultaneously send data signals to telephones RvlF'T1-MFTn.

When this data signal transmission is completed, the telephone MFT
Data signals are sent from l to MFTn sides all at once,
If there is any information, that information is held in the terminal units TEU1-TEUn. Telephone MFT
l～r! Data signal transmission from 4F'Tn is ゜'MF
When it is terminated by 'T transmission end', the main control unit MC
U performs ``start check'' again, but if there is an ``incoming call'' from the station line SLl after the previous check, this incoming information is given from the station line unit SLUl, so it is immediately sent to the terminal units TEUl to TEUn. The incoming call information is sent sequentially to each unit TEU1~
Retained in TEUn.

Next, the station line unit SLU2 is checked, and if there is no information, the station line unit SLUm is sequentially checked, and then the terminal unit πU1 is checked. This is the phone MF'T in the previous check period.
By sending a data signal from 1, the terminal unit TEU1
Therefore, if this information is "station line transmission", information to that effect is given to each station line unit SLUl to SLUm and held, and each terminal unit TE
This information is also given to Ul~J pressure Un, and the terminal unit TE
A response confirming the outgoing call is held for Ul to TEUn, and a command to display that the telephone MFTl is busy is held for the terminal unit TEU2.

In addition, if telephone MFT2 has been making an "extension call" since the last check, this information is given only to each terminal unit TEU1 to TEUn, and telephone MFT2 also displays a busy message. The command to do so is retained.

As described above, when the occurrence of information is confirmed, the main control unit MCU sends and receives the necessary information each time, and
The other terminal units TEUl to TEUn are checked, and by ゜゜TEU sending start゛, each terminal unit TEUl to TEUn is made to send out data signals indicating each information, and data signals from the telephones MFTl to MF'Tn are sent. Sending is performed again.

As a result, each of the telephones MFTl to MFTn displays an incoming call from the central office line SLl, and at the same time, the telephones MF'Tl and MF'T2 display that they are in a calling state. , other telephone MFTl~
At MFTn, it is displayed that telephones MF'Tl and MFL are in a busy state.

Note that information such as dialing, call termination, etc. from each of the telephones MFTl to MFTn is similarly given to each terminal unit TEUl to TEUn by sending data signals. Therefore, information is exchanged between the main control unit MCU, the office line units SLUl to SLUm, and the terminal units TEUl to T.
Everything was done with EUn, and the phone M
Transferred to FTl~MFTn, telephone MFTl~MFT
Since the information is sent from n at the same time, the central office line S[
The total time required is much shorter than checking the information for each of the telephones MF'T1 to MF'Tn and transmitting and receiving the information each time.

That is, the office line SL has 4 lines, the telephone MFT has 12 lines, and each processor CPU has 4 bits.
When the clock pulse frequency is set to 7, the instruction execution speed is approximately 300 steps/1 msec.
Even if information is generated and information is exchanged accordingly, the time required for each station line unit SLU or terminal unit TEU is about 1 msec, and the time from ``start of check'' to ``start of TEU transmission'' is approximately 1 msec. Maximum travel time is 16m
sec, and data transmission. Transmission speed of 80Bi
t/Sec, and assuming that one word of the data signal is composed of 11 bits, it takes approximately 14 msec from "゜TEU transmission start'' to the end of data signal transmission to the telephone MFT. Therefore, the time required for data signal transmission in the opposite direction is the same, so the maximum time required from "゜check start'' to the next ゛check start'' is about 40 to 50111 SeC,
This makes it possible to feel no delay in the operation of the telephone MFT.

FIG. 5 is a flowchart showing the operating status of the main control unit MCU for executing the above-mentioned information exchange and various controls. Built-in RAM (RandOm
Control processing is executed while data is being accumulated in (AccessMemOry). First, after ゜゜Initial state setting゛, the central office line unit 1゜゛Selects the SLU and checks and analyzes the information of the central office line. Sequentially select terminal unit '4TEU to send a command based on the station line information, and if the answer is YES that the information processing from the information processing from all SLUs has been completed, select the terminal unit '4 TEU one after another and send the MFT information. When the analysis is ``YES'' indicating that processing is required, the call control unit 0A determines whether it is a central office line call or an extension call call.
Based on the setting information of D, if “゜Central line call request”,
After performing (station line reservation) described later, station lines SLl~S
Depending on whether the Lm is busy or not, it is determined whether the request is accepted, and if it is YES, ゜゜The corresponding SLU/
After selecting the TEU and sending out an operation command, and also performing ``timer processing'' to be described later, the cross point CP is controlled to ``close the communication path'' to establish an exchange connection.

Also, if it is an “extension call request”, link circuit level ~ L
It is determined whether the request is accepted depending on whether or not all calls are in progress, and if the answer is YES, the relevant TEU is selected, the operation command is sent out, the timer processing is performed, and the relevant call is accepted. Close the road.

When the above call state ends, the call is terminated, the corresponding TEU is selected and a recovery command is sent, the corresponding SLU is selected and a recovery command is sent, and the corresponding communication channel is The exchange connection state is restored by opening the switch.

However, if the ゜゜ request is accepted but the answer is NO, 6
Selects the TEU and sends a request rejection command indicating that a new call on the ``local office line'' or ``extension line'' is not possible due to one of the lines being busy.

When these processes are completed, it is determined that the information processing from all TEUs has been completed, the timer detection process described below is performed, and a command to start transmitting and receiving information with the MFT is sent to all TEUs. and the above-mentioned terminal units TEUl~TE
Data signals are sent and received between Un and the telephones MFTl to MF'Tn, and if it is YES that all TEUs have completed sending and receiving information with the MFT, one cycle between "check start" in FIG. ends.In addition, (station line reservation)
The central office line SL is reserved by pressing the central office line selection button on the telephone MFT before the telephone MFT goes off-hook, and in principle any one of central central lines SLi to SLm S is not busy. It is assumed that there is, and this (
5 seconds after pressing the central office line selection button
If the telephone MFT is not taken off-hook within a certain period of time, the off-hook is automatically released.

In addition, in the case of an "extension call request," the circuit will be restored if there is no response within a predetermined time such as 30 seconds even if the other party is called.In order to regulate these times, the processor A timer is configured in CPUm and (
A timer for a predetermined time starts depending on the request for an extension call.
In the "select the relevant SLU/TEU and send the operation command" and "select the relevant TEU and send the action command" timer process, each timer is stopped.

Therefore, “Whether information processing from all TEUs has been completed?2
In the ``6 timer detection process'' 5, which follows 1, it is checked that these timers have not timed up, and on this premise, the process moves to the next step.

FIG. 6 is a flowchart showing the operations of the station line units SLU1 to SLUm, which are executed by the processors CPUs according to instructions stored in their ROMs.

First, after "initial state setting", "detection, processing and storage of the station line state" is performed, and "YES" is selected from the MCU.
In addition to becoming S, sending information to ゜゜MCU is Y.
If it is an ES, it will "send the stored station line information to the MCU" and "input the input completion signal from the MCU, but Y"
If it becomes ES, information transmission ends.

Also, if it is NO to send information to the MCU, input an operation command from the MCU, and when this is completed, send an input completion signal to the MCU, and then
It executes operation commands from U to close the loop to the station line SL, send out dial pulses, etc.

FIG. 7 is a flowchart showing the operation of the terminal units TEUl to TEUn, which the processor CpUt executes in accordance with instructions stored in its own ROM.

First, after "initial state setting", if "Selected from MCU" is NO, it is determined whether there is a command to start transmitting/receiving information with ゜'MF'T, and if this is YES, "゜MFT
Then, it receives and processes the information from the MFT, and if the content is YES based on the judgment that it is necessary to send it to the MCU, it sends the MFT information to the MCU. After remembering it as “゜MCU-
Sends an information transmission completion signal with SMFT.

Also, if “゜Selected from MCU” is YES,
'6 Determine '5 whether to send MFT information to the MCU', and if YES, select the content stored in the above-mentioned 6 'Storage as MFT information to be sent to the MCU'. The information is sent to the MCU by "send", and when the "input completion signal from the MCU is inputted" becomes YES, the information sending ends.

On the other hand, it is NO to send ゜゜MFT information to MCU.
In this case, the command is input from the MCU, and upon completion of the command, the command input completion signal is sent to the MCU, and after the input command is processed, it is sent as information to the MFT. The memory status information is stored and retained until the above-mentioned ``Send the memory status information to the MFT''.

FIG. 8 is a circuit diagram showing details of the outgoing/receiving restriction unit 0AD in FIG. The bus lines Y1 to Y4 and 7Y11 to Yl as
4 is provided for outgoing call restriction and incoming call restriction, and due to the intersecting relationship with these, telephones MFT1 to N4 are provided.
Bus lines x1 to Xn as telephone bus lines corresponding to F'Tn
are provided, and at the intersections of bus lines Y1 to Y4 and Yll to Yl4 and x1 to Xn, diodes D and manual setting switches (hereinafter referred to as switches) DSOl to DSOn and D
A series circuit with SAl to DSArl is inserted. In addition, +5V is applied to the bus lines Y1 to Y4 and Yll to Yl4 via the resistor R and kept at "゜H゛" (high level).
, BFa, while the buses x1 to X
n is connected to the main control unit MCU via the decoder DEC.
The telephone designation signal from is A.

The output of the decoder DEC for any of the bus lines x1 to Therefore, the switches DSO1-DSOnNDSA1-DSA corresponding to each of the telephones MFT1-MFTn
If rl are all off, the bus lines Y1 to Y4, Y are always
ll to Yl4 are "H", and the buffer amplifier BFO or BFa is operated by the check signal CSLO or CS-L given from the main control unit MCU in response to the checking of the outgoing call restriction and the check of the incoming call restriction, and the signal of ゜゜H゛ is output. is sent to the main control unit MCU as one of the outputs B3 to B3. However, if the switch DSOl-1 is turned on according to the setting of the outgoing connection status between the office line SLl and the telephone MFTl, the bus line X1 becomes " When the voltage becomes L, the bus line X1 passes through the diode D and the switch DSOl-1.
The bus line Y1 becomes ゜``L'' due to ``゜L'', and output B.

Since it is also ゜゜L゛, the main control unit MCU is specifying the telephone MFTl by the telephone designation signal ~~A3, and is also sending out the check signal CSLO, and outputs B. became “L”, so the central line SL
It is determined whether outgoing calls from telephone MFTl to phone MFTl are restricted. The same applies to incoming call regulation; for example, switch DSAl-8 is connected to central office line SL4 and telephone MF'T.
If it is turned on according to the incoming call connection status setting with 1, when the main control unit MCU specifies the telephone MFTl and sends out the check signal CSLA, the output B3 becomes "L". It is determined that the incoming call j from line SL4 cannot be connected to telephone MF'T1.

Note that the above operation is performed by the switches DSO2 to DSOn, D
The same is true even if any of SA2 to DSAn is turned on,
Blocking of outgoing calls or incoming calls by any one of the office lines SL1 to SL4 is performed by controlling the connection to any one of the telephones MFT1 to MFTn.

In addition, the bus lines Y1 to Y4, Yll to Yl4 are not set to ゜“H”, and the direction of the diode D is reversed.
The same applies to the decoder DEC providing ゜゜H゛, and in some cases, the buffer amplifiers BFO, BF
a, the decoder DEC, etc. may be omitted. Further, although the present invention aims to restrict outgoing and incoming calls, it is also possible to restrict only outgoing or incoming calls.

As is clear from the above explanation, according to the present invention, it is possible to individually set outgoing/restricted calls or incoming call restrictions for a combination of either one of the central office lines and one of the telephones by simply operating a switch. Since it is easy to change, great effects can be obtained in key telephone devices of various configurations.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire system, Fig. 2 is a block diagram of the central office line unit, Fig. 3 is a block diagram of the terminal unit, and Fig. 4 is a block diagram of the main control unit. Figure 5 is a flowchart showing the operation of the main control unit to execute the operation of Figure 4, Figure 6 is the operation of the central office line unit. 7 is a flowchart showing the operation of the terminal unit,
FIG. 8 is a circuit diagram of the call regulation unit. MCU・・・・・・Main control unit, SLUl~SLU
m... Office line unit (line unit), TEUl~
TEUn...Terminal unit, MFTl~MFTn
...Telephone (button type telephone), 0A[)...
・・Call regulation unit, SLi to SLm・・Station line (external line), ■L1 to VLn・・Voice circuit, DL
l~DLn...Data line, CPUm, CPU
s, CPUt... Processor, Y1 to Y4, Y
ll~Yl4...Bus line (railway bus line), x1~Xn...
... Bus bar (telephone bus bar), D... Diode, DSOl~DSOn, DSAl~DSArl...
...Switch (manual setting switch).

Claims (1)

[Claims] 1 A line unit that performs a connection operation with an external line, and a plurality of key telephones connected to each other via a pair of voice lines and a data line, and which transmit and receive data signals to and from the key telephone via the data lines. a terminal unit, an exchange connection circuit that performs an exchange connection between the voice line connected to each terminal unit and the external line accommodated in the line unit; In a button telephone device comprising a main control unit having a processor for controlling each of the units and an exchange connection circuit, each of the button telephones and a line bus corresponding to the external line and sending an output to the main control unit are provided. A call regulation unit is provided in which a serial circuit of a diode and a manual setting switch corresponding to each of the key telephones is inserted at each intersection with a telephone busbar to which a telephone designation signal is applied from the main control unit. a control unit sequentially designates the telephone busbars and gives the telephone designation signal;
Based on the output of the track bus in response to on/off of the manual setting switch according to the connection status setting between the external line and the button telephone, the designated telephone bus corresponds to the track bus for the button telephone corresponding to the designated telephone bus. The main control unit determines the regulation of incoming and outgoing calls via an external line,
A call regulation system for a button telephone device, characterized in that connection control of the external line to the button telephone device is performed.