JPS6022869B2 - Information transmission method in button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button telephone device that accommodates a central office line from a central office and a plurality of button telephones (hereinafter referred to as telephones), and provides switching connections between the central office line and the telephone, and between the telephones. be.

The conventional button telephone device consists of a main device mainly consisting of a relay circuit, a telephone having a mechanical lock button connected to the main device by a large number of indoor wiring, and a mechanical lock button. This device performs subsequent selection between telephones or selects a central office line in accordance with button operations, and makes and receives calls via the central office line via the main device, or calls between telephones by receiving power for communication from the main device. can be,
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 relays, it is large and has poor reliability, and it is extremely difficult to implement services such as regulating incoming and outgoing calls and making reservations for central office lines when making calls via central office lines. This resulted in the following shortcomings.

As a countermeasure to these shortcomings, a processor such as a microprocessor is installed for each office line and telephone line to process information such as incoming and outgoing calls generated from the office line and telephone line, and a crosspoint as an exchange connection circuit is installed. Furthermore, it is conceivable to provide a main control processor to control each processor in an organized manner.

However, if information is exchanged between processors and with telephones using the same routine, each telephone must process various types of information and exchange information. In this case, the time required for information processing on all lines increases, making it extremely difficult to respond quickly to telephone operators.

The present invention has an object of fundamentally solving the above problem, and has a main control unit equipped with a first processor, which performs the operation of connecting the office line, and detects the state of the office line and controls the main control unit based on the main control unit. a second memory for storing information to be sent to the control unit;
A central office line unit provided with a processor corresponding to the central office line, and connected to the telephone via a voice line and a data line, transmits command information to the telephone as a data signal, and transmits the data signal from the telephone. and a third processor that stores information to be sent to the main control unit based on the contents of the received information, and is connected to a terminal unit provided corresponding to the telephone set, and to the central office line via the central office line unit through each terminal unit. In a button telephone device comprising an exchange connection circuit for exchange connection of voice lines, a first processor sequentially checks the stored information of each office line unit and terminal unit, and transfers information based on the results of this check to a predetermined terminal unit. The present invention provides an extremely rational information transmission method in a button telephone device, which allows information to be transmitted to and held by a terminal unit and a telephone set, and also to transmit and receive information simultaneously between a terminal unit and a telephone set.

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, where the central office lines SL, ~SLm from the telephone office are connected to central office line units SLU, ~SLUM.
Only the voice signal is separated and given in parallel to each terminal unit TEU, ~TEUn, and transmitted to multiple telephones MFT, ~MFTn via cross points in the terminal units TEU, ~TEUn. Exchange connections will be made.

Further, link circuits L to Lp are provided between the terminal units TEU and .about.TEUn, and exchange connections between the telephones MFT and .about.MFTn are also possible via the aforementioned cross points.

Note that the telephone M' with the terminal units TEU, ~TEUn
The terminal units TEU, ~TEUn and the telephones MFT, ~MFTn are connected to each other by a 4-wire line consisting of voice lines VL~VLn and data lines DL, ~DLn. Voice signals and data signals in the form of FS signals (frequency shift signals) are transmitted and received through the provided line transformer, and the voice lines VL, ~VL
Power is supplied to the telephone sides FT, -MFTn from the terminal units TEU, -TEUn through neutral points provided in the line transformers of the data lines DL, -DL.

In addition, main control unit MCU, station line unit SLU
, ~SLUM and the terminal units rEU, ~TEUn are equipped with a processor such as a microprocessor, and the processors of the terminal units TEU, ~TEUn decode and hold the transmission information etc. from the telephones MFT, ~MFL, and It decodes and holds incoming call information etc. given from the main control unit MCU, and sends outgoing information etc. to the main control unit MCU while sending out incoming information etc. to the telephones MFT, ~MFL according to instructions from the unit MCU. The main control unit MCU checks the outgoing information from the terminal units TEU, ~TEUn, and the incoming information from the central office line units SLU, ~SLUM, and also checks the setting information of the outgoing/receiving restriction unit OAD. After checking, command information based on these is sent to the station line units SLU, ~SLUM and terminal units TEU, ~TE.
It sends it to Un and controls the exchange operation of the entire system.

On the other hand, the telephones MFT, -MFTn are equipped with the required number of non-locking button switches and indicator lights, and are also equipped with a dial for dialing a central office line, as well as a telephone circuit and a buzzer or bell for notifying an incoming call. , a processor and a MODEM (modulator/demodulator), and the processor decodes the information generated by the button switch operation and the dial information by the dial operation, controls the MODEM, and sends it out as a data signal, while the terminal unit TE
A data signal from a MODEM provided in U, -TEUn is received by its own MODEM, and the received output is decoded by a processor to turn on an indicator light, ring a buzzer or a bell, etc. Figure 2 shows the central office line unit SLU.
, ~ This is a block diagram of SLUM, which is a signal detection circuit DE using a diode bridge circuit, photo coupler, etc.
T detects the calling signal and provides it as incoming call information to the processor CPUs.
Relay HS operates under the control of Us, and its contact hs
When turned on, a loop circuit is formed via the primary winding of the line transformer LTs, and at the same time, the relay HS operates under the control of the processor CPUs, and when the relay HS is restored, the contact hs is turned on and off, and the dial is turned on. It also sends out pulses.

FIG. 3 is a block diagram of the terminal units TEU, ~TEUn, in which the voice line VL from the telephone M'T is routed via the line transformer LTv and the crosspoint CP as a switching connection circuit to the central office line units SLU, ~TEUn. The cross point CP is connected to the station lines SL, .about.SLm or the link circuits L, .about.Lp via SLUM, but the cross point CP is turned on under control from the main control unit MCU, thereby establishing a predetermined exchange connection.

Furthermore, the data line DL from the telephone MFT is connected to the MODEM/MDM via a line transformer LTd. According to the control of SETSUSA CPUt, MODEM・
While the MDM sends data signals as FS signals using audio frequencies, the FS signals from the telephone M'T are
After the M/MDM demodulates the data signal, the processor CP
It is given to Ut. FIG. 4 shows the exchange of information between the main control unit MCU and the station line units SLU, ~SLUM and the terminal units TEU, ~TEUn, and the telephone MFT,
This is a time chart showing the information exchange operation with ~MFTn. First, each unit SLU, ~SLUM, and TEU
, ~ If there is no incoming/outgoing information on the TEUn side, even if a "check start" is performed by sending a boring signal from the main control unit MCU, since no information is retained, the boring signal is sequentially transmitted to each unit SLU. ,~SLU
The check ends only by sending data to M, TEU, ~TEUn, and at the end of the check, the terminal units TEU,
A "TEU sending start" command is given to TEUn from the main control unit MCU, and thereby all terminal units TEU. ~TEUn sends data signals all at once to telephone M'
T, ~MFTn.

When this data information transmission is completed, the telephone MFT
,~Data signals are sent from the MFTn side all at once,
If there is any information, that information is held in the terminal units TEU, -TEUn. Telephone MFT
, ~ When the data bond 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, check the station line unit SLU2, and if there is no information, check up to the station line unit SLUM in order, and then move on to check the terminal unit TEU.
If a call has been made since the last check, this is the telephone MFT in the previous check cycle.
Since this information is held in the terminal unit TEU by sending out a data signal from Terminal unit TEU
,~TEUn also gives this information, and the 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 maintained.

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
Also in FT2, a command to display a busy message is held.

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
The data signals representing each piece of information are caused to be sent from EU, .about.TEUn, and the data signals are also caused to be sent from the telephones MFT, .about.MmTn again.

As a result, each telephone MFT, to MFTn displays an incoming call from the central office line SL, and at the same time, telephones MmT, M'L display that they are in the outgoing state, and others In the telephones MFT3 to MFL, it is displayed that the telephones MFT, , M'L are in a busy state.

In addition, each telephone MFT, ~ M "Dialing from L,
Information such as end of call is similarly given to each terminal unit TEU, -TEUn by sending a data signal. Therefore, information is exchanged between the main control unit MCU, the central office line units SLU, ~SLUM, and the terminal units TEU, ~TE.
The staff that was all done with Un, the phone MF in one fell swoop.
T, ~MFL, and the information from the telephones MFT, ~MFL is also sent at the same time, so it is better to check the information for each office line SL, ~SLm and telephones MFT, ~MFTn, and exchange information each time. The total time required is also significantly reduced.

In other words, when the office line SL has 4 lines and the telephone MFT has 12 lines, and each processor CPU is made by Totoit, and its clock pulse frequency is 2 MHZ, the instruction execution speed is approximately 30 p/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 maximum time required is lahsec
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 msecC, and the time required for data signal transmission 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 the operational delay of the telephone MFT is It becomes something that you don't feel at all.

FIG. 5 is a flowchart showing the operating status of the main control unit MC to execute the above-mentioned information exchange and various controls. Based on the same built-in RAM (Random
Control processing is executed while data is being accumulated in the AccessMemo.

First, after "setting the initial state", select the central office line unit "SLU and check and analyze the central office line information". is carried out by importing stored information, and “processing is necessary” is Y.
If it is ES, "select all TEUs in sequence and send commands based on station line information", and if "information processing from all SLUs is completed" is YES, select terminal units 'TEUs in sequence. Analyze the MFT information, and if YES is found in ``Is processing necessary?'', a ``Central line call request'' is made 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 there is, it is determined whether the request can be accepted depending on whether or not all station lines SL, ~SLn are in session, and if YES, it is determined whether the request is accepted or not, and if the answer is YES, it selects the corresponding SLU/TEU and sends the operation command. , controls the cross point CP and performs exchange connection by "closing the corresponding communication path".

In addition, if it is an "extension call request", link circuits L to Lp
``Whether the request can be accepted'' is determined based on whether or not all channels are busy, and if the answer is YES, ``the corresponding TEU is selected and an operation command is sent'', and the ``closed stripe of the corresponding channel'' is determined.
Do the following. When the above call status 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 call path is ``Release'' restores the exchange connection state.

However, if “Can the request be accepted?” is NO, “
``Select the relevant TEU and send a request rejection command'' indicating that a new call on the ``office line'' or ``extension line'' is not possible due to all calls being made.

When these processes are completed, it is determined whether "information processing from all TEUs has been completed", "M" sends a command to start transmitting and receiving information with T to all TEUs, and the above-mentioned terminal unit TEU
, ~TEUn and telephone MFT, ~MFTn perform data signal transmission and reception, and if "Have all TEUs completed information transmission and reception with MFT" is YES, " in 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 setting the initial state, the station line state is detected, processed and stored, and the question ``Selected from the MCU'' becomes YES, and the question ``Do you want to send information to the MCU?'' becomes YES.
If so, "Sent the stored station line information to the MCU" and "Did you input the input completion signal from the MCU?" is YES.
If so, 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 then "84
It executes the operation commands from the CU to close the loop for the station line SL and send out dial pulses.

FIG. 7 is a flowchart showing the operation of the terminal units TEU, -TEUn, which is executed by the processor CPUt in accordance with instructions stored in its own ROM.

First, after "Initial state setting", if "Selected from MCU" is NO, "M" determines "Is there a command to start sending and receiving information with T"? If this is YES, "Stored to MFT" is determined. ``transmit information'', then perform ``M``receive and process information from T'', and if the content is ``It is necessary to send to MCU'' and YES by Rizo's judgment, ``MFT information to be sent to MCU is After “Memory”, MFT to “MCU”
"Sends an information transmission completion signal."

Also, if “Selected from MCU” is YES,
“Determine whether to send the MFT information to the MCU, and if this is YES, the MFT information sent to the MCU as described above.
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.
At this time, the command is input from the MCU, and when the command is completed, the command is sent to the MCU as a completion signal.
After "processing the input force command", it is "stored as information to be sent to the MFT" and held until the aforementioned "sending of stored information to the MFT".

Note that the terminal units TEU, ~TEUn and the telephone M'T
, to MFTn, first, the telephone MFT
, ~MFTn, and then information may be sent from the terminal units TEU, ~TEUn, and the data lines DL, ~DL and each MO
If the DEM/M tray M can transmit and receive at the same time, the terminal units TEU, ~TEUn and the telephone M ``T, ~M
Information can also be transmitted from both directions with mTn.

As is clear from the above description, according to the present invention, the number of required wires is reduced compared to the conventional button telephone device, and by changing the program of each processor, it is easy to increase or decrease the number of continuous functions, and at the same time, Since the time required for information processing and information transmission is shortened, and prompt service can be provided, it is highly effective in key telephone devices for various uses.

[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. A time chart showing information exchange operations between units and between telephones, FIG. 5 is a flowchart showing operations in the main control unit for executing the operations shown in FIG. 4, and FIG. 6 shows operations of the central office line unit. Flowchart FIG. 7 is a flowchart showing the operation of the terminal unit. MCU... Main control unit, SLU. ~SLU
M......Station line unit, TEU, ~TEUn...
Terminal unit, MFT, ~MyenTn...Telephone (button type telephone), OAD... Call restriction unit,
SL~SLm...Station line, VL, ~VLn...
...Voice line, DL, ~DLn...Data line, CPUm, CPUs, CPUt...Processor. Rudder Figure 2 Figure 3 Figure 6 Dimensions Figure 5 Figure 7

Claims (1)

[Claims] 1 A main control unit equipped with a first processor, and a second processor that connects the station line, detects the status of the station line, and stores information to be sent to the main control unit based on this. A central office line unit provided corresponding to the telephone line is connected to the key telephone via a voice line and a data line, and transmits command information to the key telephone as a data signal and receives data signals from the key telephone. A terminal unit provided corresponding to the key telephone set includes a third processor that stores information to be sent to the main control unit based on the contents of the terminal unit, and a terminal unit that connects each terminal unit to the central office line via the central office line unit. In the button telephone device, the first processor sequentially checks the stored information of each office line unit and the terminal unit, and based on the result of the check, Information is given to a predetermined terminal unit so that the information is held, and when the check of each unit is completed, the information is transmitted simultaneously between each terminal unit and the key telephone corresponding to the unit. An information transmission method in a button telephone device, which is characterized in that it allows sending and receiving of information.