JPS6022870B2 - Line reservation method for button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button telephone that accommodates an external line such as a central office line from a telephone office and a plurality of button telephones (hereinafter referred to as telephones), and performs exchange connection between the external line and the telephone or between the telephones. It is related to the device.

The conventional button telephone device consists of a main device mainly consisting of a relay circuit, a telephone with a mechanical lock button connected to the main device through a large number of indoor wiring, and a telephone with a mechanical lock button. This is a device that selects a connection between telephones or a central office line according to the operation, and makes and receives calls via the central office line via the main device, or makes calls between 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 phone increases, which increases the number of installations and makes maintenance and inspection difficult.
Since the main device is composed of a relay, it is large in size and has poor reliability. In particular, it is extremely difficult to implement call regulation and central office line reservation services when making calls via central office lines. was occurring.

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional art, and includes a line unit that performs a connection operation with an external line;
A plurality of terminal units each connected to a telephone via a pair of voice lines and a data line, and transmitting and receiving data signals to and from the telephone via a data line, and a voice line and a line unit connected to each terminal unit. A button telephone consisting of an exchange connection circuit that performs exchange connection with an external line housed in the telephone, and a main control unit equipped with a processor that controls each predetermined unit and exchange connection circuit according to information from the line unit and terminal unit. In the device, the main control unit selects the corresponding external line by the telephone based on the information that the external line selection button of the telephone has been operated, assuming that the telephone is in an off-hook state and the external line corresponding to the external line selection button is not busy. reservation information is stored in the memory, and when off-hook information is given from the telephone within a certain period of time, the exchange connection circuit is controlled to establish an exchange connection between the voice line of the telephone and the corresponding external line. , and when off-hook information is not given within a certain period of time, the reservation information in the memory is erased, making it possible to reserve an external line such as a central office line before making a call, making it extremely convenient to reserve a line in a button telephone device. It provides a method.

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

Figure 1 is a block diagram of the entire system, in which central office lines SL and ~SL from the telephone office as external lines are individually connected to central office line units SLU and ~SLUM as line units, and only voice signals are separated. Moreover, each terminal unit T
EU, ~TEUn in parallel and terminal unit TE
Exchange connections with a plurality of telephones MFT, -MFTn are made via cross points in U, -TEUn.

In addition, link circuits L, ~Lp are provided between the terminal units TEU, ~TEUn, and exchange connections between the telephones M'T, ~MyenTn are also possible via the aforementioned cross points. There is.

Note that the terminal units TEU, ~TEUn and the telephone MFT
, ~M circle Tn, each has a pair of voice lines VL~VL.
Each is connected by a 4-wire line with data lines DL to DLn, and voice signals and FS signals (frequency At the same time, data signals are transmitted and received via the voice line VL, ~
Power is supplied to telephones MFT, -M'Tn from terminal units TEU, -TEUn via neutral points provided in line transformers between VL and data lines DL to DL.

In addition, main control unit MCU, station line unit SLU
, ~SLUM and the terminal units TEU, ~TEUn are equipped with a processor such as a microprocessor, and the processor of the terminal units TEU, ~TEUn decodes and holds the transmission information etc. from the telephone M'T, ~MFTn. At the same time, the main control unit MCU decodes and holds the incoming call information etc. given from the main control unit MCU, and sends out the incoming information etc. to the telephones MFT, ~MFTn according to instructions from the unit MCU, and sends outgoing information etc. to the main control unit MCU. The main control unit MCU checks the outgoing information etc. from the terminal units TEU, ~TEUn and the incoming information etc. from the central office line units SLU, ~SLUM, and also checks the outgoing call regulation unit OAD. After checking the setting information, the command information based on this is sent to the station line unit SLU, ~SLUM and the terminal unit TEU, ~
It sends it to TEUn and controls the exchange operation of the entire system. On the other hand, the telephones MFT, to MFTn are equipped with the required number of non-locking button switches and indicator lights, as well as a dial for making a call to a central office line, a telephone circuit, a buzzer or bell for notifying an incoming call, and a processor and It has a MODEM (Modulator/Demodulator), and the processor decodes the information generated by button switch operations and the dial information by dial operations, controls the MODEM, and sends it out as a data signal, while the terminal unit TEU
, ~TEUn receives a data signal from a MODEM provided in its own MODEM, and a processor decodes the received signal to turn on an indicator light, ring a buzzer or a bell, etc.

FIG. 2 is a block diagram of the station line units SLU, ~SLUM, in which a signal detection circuit DET using a diode bridge circuit and a photo coupler detects a calling signal, and sends it to the processor CPUs as incoming call information. At the same time, the relay HS is operated under the control of the processor ZCPUs, and when its contact hs is turned on, a loop circuit is formed via the primary winding of the line transformer LTs. Accordingly, the relay HS operates and the contact hs is turned on due to recovery.
It turns off and also sends out diamond pulses.

FIG. 3 is a block diagram of the terminal units TEU, -TEUn, in which the voice line VL from the telephone MFT is connected to the line transformer LTv and the cross point C as an exchange connection circuit.
The cross point CP is connected to the station lines SL, ~SLm or the link circuits L, ~Lp via the station line units SLU, ~SLUM, or the link circuits L, ~Lp through the station line unit SLU, ~SLUM. A predetermined exchange connection is made by . In addition, the data line DL from the telephone MFT is connected to MODEM/MDM via a line transformer LTd.
According to the control of the processor CPUt, the MODEM/MDM sends out data signals as FS signals using audio frequencies, while
The MODEM/MDM demodulates the S signal into a data signal and provides it to the processor CPUt. Fourth
The figure shows the central office line unit SLU by the main control unit MCU.
, ~SLUM and terminal unit TEU. This is a time chart showing the information exchange operation with ~TEUn and the information exchange operation between the same unit TEU, ~TEUn and the telephone MFT, ~M'Tn. First, each unit SLU, ~SLU
If there is no incoming/outgoing information on the M, TEU, to TEUn sides, even if the main control unit MCU "starts checking" by sending out a boring signal, the boring signals will be sent out one after another because none of them hold any information. Each unit S
The check ends only by sending to LU, ~SLUM, TEU, ~TEUn, and at the end of the check, "TEU sending start" is sent to terminal units TEU, ~TEUn.
A command is given from the main control unit MCU, whereby all the terminal units TEU, . . . TE, simultaneously send data signals to the telephones M'T, .

When this data signal transmission is completed, the telephone MFT
,~Data transmission from the MFTn side is done all at once,
If there is any information, that information is held in the terminal units TEU, -TEUn. Telephone MFT
, ~ When the data signal transmission from MFTn ends with "M"T transmission end", the main control unit MCU again "
However, if there is an "incoming call" from the station line SL after the previous check, this incoming information is given from the station line unit SLU, so the incoming call is immediately sent to the terminal units TEU, ~TEUn. Information is sent out sequentially and held in each unit TEU, -TEUn.

Next, the station line unit SLU2 is checked, and if there is no information, the station line unit GLUM is checked sequentially, and then the terminal unit TEU is checked.
If an outgoing call, etc. has been made since the last check, this is the telephone MFT.
Since this information is held in the terminal unit TEU by sending out a data signal from Terminal unit TEU
．． ~ Also give this information to TEUn, and terminal unit TEU
, sends a transmission confirmation response to the terminal unit TEU2.
From then on, a command to display that the telephone MFT is busy is held.

Additionally, if telephone MFT2 has been making an "extension call" since the last check, this information is given only to each terminal unit TEU, ~TEUn, and telephone MFT2
A command to display a busy message is also held in L.

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 TEU, ~TEUn are checked, and each terminal unit T
EU. -TEUn is caused to send out data signals indicating each piece of information, and the telephones MFT and -MFTn are also caused to send out data signals again.

As a result, the telephones MFT, to MFTn display an incoming call from the central office line SL, and at the same time, the telephones M'T, M'L display that they are in the outgoing state. , other telephones MFT3 to MFTn
, it is displayed that the telephones MFT, . . . MFL are in a busy state.

In addition, each telephone M yen T, ~M 'Dialing from L,
Information such as call termination is similarly given to each terminal unit by sending data signals. Therefore, information is exchanged between the main control unit MCU and the station line units SLU, ~SLUM.
and terminal units TEU, -TEUn are transferred all at once to telephones MFT, -MFTn, and information from telephones MFT, -MFTn is also transmitted at the same time.
The total time required is significantly reduced compared to checking information for each of T, to MmTn and exchanging information each time.

In other words, when the office line SL has 4 lines, the telephone MFT has 12 lines, each processor CPU is of the 5th grade, and its clock pulse frequency is 2MH2, the instruction execution speed is approximately 30p/lmsec. Therefore, 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 1msec, and from "start of check" to "start of TEU transmission" The required time is up to 18 hsec.
The data signal transmission speed is about 80 bits/se.
c, and if one word of the data signal is composed of lIBit, then from "TEU transmission start" to telephone M
Until the data signal transmission to FT is completed, approximately 1
4 msec, and the time required for the data signal in the opposite direction is also the same, so the maximum time required from "check start" to the next "check start" is about 40 to 5 hsec, and you will not feel any delay in the operation of the telephone MFT. It becomes something that cannot be allowed.

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. , similarly built-in RAM (RandomA
Control processing is executed while data is being accumulated in accessMemo.

First, after "initial state setting", the central office line unit "selects the SLU and checks and analyzes the central office line information",
If “Is processing necessary?” is YES, “select all TEUs in sequence and send commands based on station line information” and “all SLs
If the power that has completed the information processing from U)'' is YES, the terminal units ``TEU'' are sequentially selected and M ``analyzes the information of T'', and when ``Is processing necessary?'' is YES, Based on the distinction between calling from a local line, calling from an extension, etc., and the setting information of the outgoing/receiving restriction unit OAD, if it is a “request for calling from a local line”, perform the (local line reservation) described later, and then call the local line SL~
“Whether the request is accepted” depends on whether SLm is busy or not.
If this is YES, “Applicable SLU
/TEU, sends an operation command, and performs "timer processing" to be described later, then controls the cross point CP to "close the corresponding communication path" to establish an exchange connection.

In addition, if it is an "extension call request", link circuits L to Lp
It is determined whether the request can be accepted based on whether or not all of the TEUs are busy, and if the answer is YES, it selects the relevant TEU, sends an operation command, and performs timer processing.
“Closing the corresponding call.”

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

However, if the answer to accepting the request is NO, “
``Select the relevant TEU and send a request rejection command'' to indicate that a new call on the ``central office line'' or ``extension line'' is not possible due to all the lines being busy.When these processes are completed, ``all TEUs'' are
Determine whether the information processing from the EU has been completed, and then proceed to the “
After performing "timer detection processing", "MF to all TEUs"
Sends a command to start transmitting and receiving information with T, causes data signal transmission and reception between the above-mentioned terminal units TEU, ~TEUn and telephones MFT, ~MFTn, and sends a command to confirm that all TEUs have completed transmitting and receiving information with MFT. ” becomes YES, one cycle between “check start” in FIG. 4 ends.
(Central line reservation) is to reserve the corresponding central office line SL by pressing the central office line selection button on the telephone MFT before off-hooking the telephone MFT.In principle, the central office line SL is reserved. ~ SLm is assumed to be non-busy, and this (station line reservation) is performed by pressing the station line selection button and then calling the telephone MFT within a certain period of time such as $ec.
It is automatically released when the user does not go off-hook.

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 3$ec even if the other party is called, and in order to regulate these times, A timer is configured in the processor CPUm, and (local line reservation) starts the timer for a certain period of time, and depending on the “extension call request”, the timer for a certain period of time starts, and “selects the corresponding SLU/TEU and issues an operation command.” Sending” and “
In the "timer process" of "select the relevant TEU and send the operation command", each timer is stopped.

Therefore, “has information processing from all TEUs been completed?”
In the next "timer detection process", 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 SLU, -SLUM, which are executed by the processors CPUs according to instructions stored in their ROMs.

First, after "initial state setting", "station line state detection/processing storage" is performed, and "Selected from MCU" is YES.
In addition, "Do you want to send information to the MCU?" is YES.
If S, “send stored station line information to MCU”
and “Did you input the input completion signal from the MCU?” is YES.
If it becomes S, information transmission ends.

Also, if 'Send information to MCU' is NO, 'input operation command from MCU', and when this is completed, 'send command input completion signal to MCU' and 'MC
It executes the operation command from U to close the loop and send dial pulses to the station line SL.

FIG. 7 shows the terminal unit TEU. It is a flowchart showing the operation of ~TEUn, which is executed by the processor CPU according to instructions stored in its own ROM.

First, after "initial state setting", if "Selected from MCU" is NO, "M" determines whether there is a command to start transmitting/receiving information with T. If this is YES, "Stored to MFT" is determined. "Send information", then "receive and process information from the MFT", and if the content is YES as determined by "Is it necessary to send it to the MCU", "store it as MFT information to be sent to the MCU". Noue, “MFT to MCU
"Sends an information transmission completion signal."

Also, if “Selected from MCU” is YES,
Determine whether "MFT information is to be sent to the MCU", and if this is YES, the above-mentioned "MFT information to be sent to the MCU" is determined.
The contents stored in "Storing as information" are sent out by "Sending stored MFT information to MCU", and
When the question ``Did you input the input completion signal from U?'' becomes YES, the information transmission ends.

On the other hand, "Do you want to send the MFT information to the MCU?" is NO.
In this case, the command is input from the MCU, and when the command is completed, the command input completion signal is sent to the MCU.
After "input command processing" is performed, "M is stored as transmission information to T" and is held until the aforementioned "transmission of stored information to MFT".

FIG. 8 is a flowchart showing the above-mentioned (station line reservation) operation in detail, and corresponds to the (station line reservation) routine in the "station line call request" shown in FIG. In FIG. 8, any telephone MFTx is connected to any central office line S.
If LY is reserved and the terminal 0 unit “TEUx
Select ``Input/analyze MFT information'' and if ``Is processing necessary?'' is YES, check whether this is the information indicating that the station line ``SLY reservation'' is on-hook and the station line selection button is pressed. If YES, each station line SL to SL stored in the data RAM of the processor CPUm
Based on the status of m, check the status of the central office line ``SLY'', and depending on whether it is busy or not, ``can you make a reservation?''
After determining this, if the answer is YES while the station line SLY is in a non-word state, the subzero information is written to the address of the RAM that stores the status of the station line SLY, and the status of the station line "SLY is reserved for TEUx."

Next, the station line 'SLY reservation timer is activated' which regulates the above-mentioned fixed time, and the terminal unit 'selects TEUx and sends a station line reservation acceptance command'.

In addition, if the office line "SLY reservation" is NO, it means that the off-hook was done before the reservation timer timed out, and after performing the office line "SLY status check",
The off-hook device determines the terminal unit "TEUx power)" that made the station line reservation, and if this is YES, writes the information on the call to the address of the RAM that stores the information on the station line SLY, The state of the local office line 'SLY is set to busy,' and then the local office line 'SLY's reservation timer is stopped.' Next, by selecting the central office line unit 'SLY and sending a central office line closing command', the central office line loop is completed, and the cross point CP is controlled to 'start the corresponding communication path'.

After that, a "timer detection process" is performed by checking the status of the reservation timer, and if "Reservation timer has timed out" is YES, it means that a certain period of time has passed without going off-hook after making a reservation for the central office line. After "selecting the TEUx that reserved SLY" and "sending a reservation cancellation command to TEUx," the reservation information for the station line SLY in RAM is deleted, and the non-busy information is sent to the address where it was stored. Write, “Make station line SLY empty.”

In addition, “power that can be reserved” and terminal unit “TE”
If the determination result of ``Is it Ux?'' is NO, the process goes to ◯ in FIG.

In addition, as the external line, in addition to a central office line, a terminal line of a private branch exchange, a dedicated line, etc. may be used, and the fixed time for reservations can be arbitrarily set according to conditions, and various other modifications are possible.

As is clear from the above explanation, the present invention makes it possible to provide a line reservation service and makes it easier to make a call from a telephone compared to conventional button telephone devices. It exhibits the effect of

BRIEF DESCRIPTION OF THE DRAWINGS 0 The figures show an embodiment of the invention, the first
The figure is a block diagram of the entire system, Figure 2 is a block diagram of the central office line unit, Figure 3 is a block diagram of the terminal unit, and Figure 4 is a block diagram of the terminal unit.
The figure is a time chart showing the information exchange operation between each unit and the telephone set by the main control unit, FIG. 5 is a flowchart showing the operation in the main control unit to execute the operation of FIG. 4, and FIG. 7 is a flowchart showing the operation of the terminal unit, and FIG. 8 is a flowchart showing the details of the central office line reservation operation.

MCU... Main control unit, SLU, ~SLU
M... Office line unit (external line unit), T
EU, ~TEUn...Terminal unit, MFT, ~M
FTn...telephone (button type telephone), OAD...
...Call regulation unit, SL, ~SLm...
Office line (external line), VL, ~VL...Voice line, DL, ~DLn...Data line, CPUm,
CPUs, CPUt. ．． ．． ．． 、． centre.

Rosetsusa. Figure 2 Festival l Figure 4 Figure 3 Figure 5 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] 1 A line unit that performs a connection operation with an external line, and a plurality of line units that are connected to a key telephone via a pair of voice lines and a data line, and that transmit and receive data signals to and from the key telephone via the data line. A terminal unit, an exchange connection circuit for making 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 each of the units and a main control unit equipped with a processor for controlling an exchange connection circuit, the main control unit controls the on-hook of the key telephone according to information on the operation of the external line selection button of the key telephone. state and that the external line corresponding to the external line selection button is not busy, stores the reservation information of the corresponding external line by the button telephone in the memory, and from now on the off-hook from the button telephone is set within a certain period of time. In response to the information being given, the switch connection circuit is controlled to make a switch connection between the voice line of the key telephone and the corresponding external line, and the off-hook information is not given during the predetermined period of time. A line reservation method in a button telephone device, characterized in that the reservation information in the memory is sometimes erased.