JPH0828901B2 - Button telephone device control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a button telephone device composed of a telephone and a main device. More specifically, in the button telephone device, blinking control of a line status display lamp of each telephone is performed. The present invention relates to a control method for performing.

[Conventional technology]

The key telephone device is composed of one main device and a plurality of telephones. A plurality of office lines are accommodated in the main device, and each telephone uses these office lines in common for communication. The telephone is provided with a station line button and a station line lamp corresponding to a station line accessible from the telephone. The user of the telephone confirms the status of use of the station line (vacant, in use, held, etc.) by displaying the station line lamp, and operates the station line button to access the station line.

In such a station line lamp display, even if the lamps correspond to the same station line, the display mode is required to be different for each telephone. For example, when there are multiple lines that are on hold, it may be confusing to transfer calls if you cannot clearly distinguish between the one held on your phone and the one held on another phone. .

As a control system for realizing the above requirements, in the conventional device, a method of directly controlling the lamp display of each telephone by the main processor of the system has been adopted. For example, when there is an incoming line call, it is necessary to provide a visual display of the incoming call to a telephone having a lamp corresponding to that line. The operation of the main processor when performing this operation is as follows.

By referring to the data registered in advance, the telephone which accommodates the office line lamp corresponding to the incoming line is extracted.

A lamp display control signal is sequentially sent to each of the extracted telephones.

This kind of processing is performed when the number of target telephones is large.
This causes an excessive load on the main processor.

[Problems to be solved by the invention]

In view of this, the present invention has a problem to be solved in a key telephone device that reduces the processing load of the main processor relating to the control of the line lamp of the telephone. Therefore, it is an object of the present invention to provide a control system for a key telephone device that enables such a case.

[Means and Actions for Solving Problems]

According to the present invention, service information relating to the attributes of a station lamp is stored in a telephone in advance, and the main processor can control the operation of each telephone by a broadcast format command, thereby reducing the control load on the main processor. The most main feature.

It differs from the conventional system in that the lamp display control signal sent by the main processor is not compatible with each telephone.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a key telephone device as an embodiment of the present invention.

In FIG. 1, ME is a main unit, KT10, 11, 20, 21 are telephones, and KT10, 11 are connected to the main unit ME via an extension bus line BUS1. Similarly, the KTs 20 and 21 are connected to the main unit MU via the extension bus line BUS2. Each bus line BUS1 and
Each of the BUS2 is composed of two pairs of transmission lines, one pair of which is a line for transmitting a signal sent from each telephone set to the main device ME, and is hereinafter referred to as a T line. The other pair is the main unit
A line that transmits a signal sent from the ME to each telephone, and is hereinafter referred to as an R line.

On the bus line, call signals and control signals are time-division multiplexed and transmitted. That is, for signal transmission on the bus line, a fixed time (for example, 125 μS) is defined as a basic unit, and a plurality of time slots are defined within that time. A plurality of these time slots are prepared for each of a call signal transmission and a control signal transmission, and communication between the main device and each telephone is realized by appropriately allocating these time slots corresponding to the telephone.

The configuration of each telephone in FIG. 1 is the same, so the configuration will be described with KT10.

The telephone KT10 is composed of a transmission control circuit TRC, a call circuit SRC, a telephone control circuit unit KTC, a telephone number holding circuit TENR, a control channel number holding circuit DCR, and a call channel number holding circuit BCR. The transmission control circuit TRC sends a signal to the T line via the line driver DRV and R via the line receiver RCV.
Receive the signal from the line. All signals transmitted on the R line are input to the SIN terminal of the transmission control circuit TRC.

On the other hand, the signal transmission from the line driver DRV is controlled by the EN output of the transmission control circuit TRC, and the output signal from the SOUT terminal of the transmission control circuit TRC is T only while the EN output is "1".
Applied to the wire. Line driver while EN output is “0”
The output terminal of DRV becomes a high impedance state.

The call circuit SPC is composed of the handset HS and the analog / digital converter A / D of the voice signal, and the digital input / output terminal of the analog / digital converter A / D is the voice information line BL.
Is connected to the transmission control circuit TRC via.

The telephone control circuit unit KTC is mainly composed of a microprocessor KTP, and detects input from various buttons KEY such as line selection buttons, function buttons and dial buttons, and provides various display functions such as line lamps and function lamps. Controls the circuit DSP. Also the microprocessor KTP
Is connected to the transmission control circuit TRC by the control signal DL, and transmits / receives the control signal to / from the main device ME via this line.
Further, the telephone control circuit section KTC includes a line data table LDT for accumulating which real line the line selection button / line lamp corresponds to. The data to be stored in this LDT is transferred from the main device ME at the system initialization stage.

The telephone number holding circuit TENR is an identification number TEN unique to the telephone.
Is a circuit for setting / holding, and can be configured using a mechanical contact switch or a non-volatile memory. All telephones in the system are given different identification numbers TEN. The information held in the telephone number holding circuit TENR is input to the microprocessor KTP.

The control channel number holding circuit DCR is a register for designating the number of the control signal time slot that can be used by the telephone among the time slots multiplexed on the bus. When the microprocessor KTP sets a predetermined number in the control channel number holding circuit DCR, the transmission control circuit T
RC takes in this information. As a result, the control signal that the microprocessor KTP exchanges with the transmission control circuit TRC is
It will be transmitted on the bus using the designated time slot.

The call channel number holding circuit BCR is a register for designating the number of a call signal time slot that can be used by the telephone among the time slots multiplexed on the bus. When the microprocessor KTP sets a predetermined number in the call channel number holding circuit BCR, the transmission control circuit T
RC takes in this information. As a result, the call signal exchanged by the call circuit SPC with the transmission control circuit TRC is transmitted on the bus using the designated time slot.

As is clear from the above description, each telephone set a predetermined time slot from the multiple control signal time slots and call signal time slots multiplexed on the bus under the control of the microprocessor KTP in the telephone. It is possible to select and transmit / receive a call signal and a control signal to / from the main device ME.

The main unit ME is composed of a bus control circuit BCC, a communication path switch SW, an office line trunk TRK, and a main control unit CC.

The bus control circuit BCC is arranged corresponding to the bus line BUS,
In FIG. 1, BCC1 is used for BUS1 and BCC2 is used for BUS2. Each bus control circuit BCC transmits / receives the multiplexed call signal to / from the call path switch SW via the highway HW, and the control signal to / from the main control unit CC via the internal data line DB. Send and receive. In addition, the bus control circuit BCC
Transmits and receives voice and control signals transmitted and received inside the main unit ME to and from the telephone by multiplexing on the bus line BUS. There is a one-to-one correspondence between the time slots for call signals on the bus line BUS and the time slots on the highway.

The control signal transferred on the internal data line DB is a bus line.
It is configured to include, as address information, the number of a control signal time slot to which the signal is transferred on the BUS.
When the bus control circuit BCC receives the control signal from the bus line BUS, the bus control circuit BCC adds the time slot number in which the received signal exists to the actual data and sends it to the main control unit CC via the internal data line DB. .

Conversely, when the control signal is transferred from the main control unit CC to the bus control circuit BCC, the main control unit CC adds the time slot number on the bus line BUS to be sent to the actual data and notifies the bus control circuit BCC. . The bus control circuit BCC sends the transferred signal to the corresponding time slot. In this way,
The main control unit CC can specify a telephone to be controlled and output a control signal.

The office line trunk TRK executes the DC loop closure for the office line CO, dial signal transmission, etc. according to the instructions of the main control unit CC, and also detects the incoming signal detection result, etc.
To notify. In addition, the voice signal is converted from analog to digital and exchanged with the telephone switch SW.

The main control unit CC is mainly composed of the main processor MP, manages system data, and controls the operation of each unit of the system.
The system data includes the telephone identification number table TENT, control signal time slot management table DCT, call signal time slot management table BCT, and telephone identification number TEN.
Telephone accommodation position number It is held in the LEN conversion table NXT.

The telephone identification number table TENT has an identification number TEN as an address, and holds the following information.

(A) Operating state of the telephone having the identification number TEN (operating, moving, unregistered) (b) Bus number connected to the telephone (c) Time slot number for control signal assigned on the bus (D) Information of function allocation to buttons and lamps of the telephone (e) Other service-related data (speed dial number information, etc.) An example of the structure of the control signal time slot management table DCT is shown in FIG. The control signal time slot management table DCT is constructed by arranging a bus line BUS number as an address, and arranging a control word at each address with one bit corresponding to each control signal time slot on the bus. Whether the time slot is used or not is stored by 1,0 of each bit. When the transmission frame of FIG. 4 described later is used, the word length of the control word is 23 bits. FIG. 2 shows an example corresponding to this.

Since the main processor MP can send and receive control signals to and from individual telephones, individual time slots for control signals are assigned to individual telephones at the system initialization stage. After this control is performed, the set of the bus line BUS number and the time slot number DCN has a one-to-one correspondence with the telephone set identification number TEN. The former set of numbers is called the telephone accommodation position number LEN. The correspondence between these two is stored in the telephone identification number TEN and the telephone accommodation position number LEN conversion table NXT.

FIG. 3 shows an example of the structure of the call signal time slot management table BCT. The call signal time slot management table BCT is configured by arranging a control word composed of a bus line BUS number as an address, and one address corresponding to each control signal time slot on the bus at each address. Whether the time slot is used or not is stored by 1,0 of each bit. When the transmission frame shown in FIG. 4 described later is used, the word length of the control word is 8 bits. FIG. 3 shows an example corresponding to this.

FIG. 4 shows a specific example of the frame structure of signals transmitted on the buses BUS1 and BUS2 in FIG.

FIG. 4 (a) shows the frame structure of the R line. TSBR0 to 7 are voice signal time slots, TSDR is a control signal time slot, TSF is a frame signal time slot, and TSS is a system control signal. Time slot for TSG is a guard bit time slot. The repetition period of the frame, that is, the time from the beginning to the end of FIG. 4 (a) is 125 μS, and 128-bit information is present in this period.

Each of the voice signal time slots TSBR0 to TSBR7 is composed of voice information (br0 to br7) of 8 bits and used for transmission of voice PCM code or digital data.

The control signal time slot TSDR is composed of 10 bits and is used for transmitting a signal for controlling a telephone from the main device ME to each telephone. More specifically, this 10
The bit is composed of an 8-bit control word (dr0 to dr7), a parity bit p of the control word, and a synchronization status indicating bit s.

The guard bit time slot TSG is inserted between the valid information time slots and 6 guard bits (gb0 to gb5) are transmitted.

Originally, this time slot is for guaranteeing the timing so that the information transmitted in the adjacent time slots on the T line does not overlap each other, but for the purpose of transmitting additional information from the main device ME to the telephone. It is also possible to use.

The system control signal time slot TSS is composed of a DE bit for displaying the operating state of the main processor MP in the main device ME and timing bits (rt0 to rt3) for notifying various timing information. Further, this portion also serves as a gerbit between the time slot TSBR7 for a call signal and the time slot TSDR for a control signal.

7-bit 2 for frame signal time slot TSF
The frame number realized by the base number (f0 to f6) is transmitted. This portion also serves as a guard bit between the control signal time slot TSDR and the call signal time slot TSBR0.

The description of FIGS. 4 (b) and 4 (c) will be sent to the back and reference is made to FIG.

FIG. 5 is an explanatory diagram showing the multiframe structure on the R line and the information transmitted by each time slot. A multi-frame consists of 96 consecutive frames. Value of frame signal time slot TSF (frame number)
As can be seen in FIG. 5, "0" is set in the first frame, and the subsequent steps are sequentially performed, and "95" is set in the last frame. By identifying this frame number, the phone
Frame synchronization and multi-frame synchronization can be established.

BR0 to 7 are audio signal time slots TSBR0 to
7 constitutes a channel (B channel) for voice or data information transmitted by 7. The most common use of the B channel is to provide a transmission rate of 64 kbps by having the telephone use one time slot in each frame and transmitting an 8-bit code in the same time slot in each frame. In addition, it is also possible to make one telephone use a plurality of time slots and provide high-speed transmission of 128 kbps, 192 kbps, and the like.

Since the bit string (gb) transmitted in the guard bit time slot is a signal that is ignored by the telephone, it can be set to any value.

There are 96 control signal time slots TSDR in one multiframe, but here, 24 time slot groups (24 D channels: DR0 to DR23) are defined in units of 4 consecutive frames. Each transmits a control signal.

The DR0 channel is a special channel used for different purposes from other channels and is called a broadcast channel. That is, the signal transmitted over the DR0 channel is received and processed as a valid signal by all telephones connected to that bus.

On the other hand, the other channels DR1 to DR23 are individually allocated to the telephones connected to the bus, and one telephone set exclusively uses one channel. Other channels are ignored,
Not communicated to the processor TKP in the phone. A control method when allocating the D channel to the telephone will be described later.

The effective information of each D channel is composed of 4 bytes. An example of how to use these 4 bytes is shown in FIG. In FIG. 6, a transmission control word used for error control or the like is arranged in the first byte. A command code for instructing the control content is arranged in the second byte, and parameter data necessary for executing the control instructed by the command code are arranged in the third and fourth bytes. For example, a command code can represent a "display instruction", and parameter data can represent a maximum of 2 bytes of display content.

Returning to FIG. 4, (b) shows the T-line frame structure in association with the R-line frame structure. A time slot TSBT in which the telephone can send a signal to the T line
0 to 7 (for voice signal) and TSDT (for control signal) are defined, and each time slot is paired with the corresponding time slot on the R line. That is, each telephone transmits a signal on the T line in the same time slot in which it receives the signal on the R line.

The signals sent to the audio signal time slots TSBT0 to 7 are added with sync bits st0 (= “1”) and st1 (= “0”) of 2-bit structure before the audio information 8 bits (bt0 to bt7). It is the configured configuration.

On the other hand, the signal sent to the control signal time slot TSDT has a configuration in which a synchronization bit is added before the control signal 8 bits (dt0 to dt7) and the parity bit (1 bit). An example of transmission waveforms when these signals are transmitted on the T line is shown in FIG. 4 (c). Manchester code is used as the transmission code.

A period (t
1), the potential difference between the T lines is zero. When the telephone starts sending signals, the start bit is (+ V, -V, -V, +
V) pattern, followed by valid information. Reception of the T-line signal in the bus control circuit BCC of the main unit ME
It is activated when the state where the potential difference between lines is zero is changed to the state where a significant potential difference exists due to the synchronization bit.

When the line length from the main device ME to the telephone is limited to a certain value or less, the time from when the main device ME sends each time slot to the R line until the corresponding signal is received from the R line is Limited to a certain value or less. From this, the main device ME can identify the type of the received signal by regarding the signal received within the time as the signal corresponding to the time slot in which the signal is transmitted.

An example of typical operation of the key telephone system configured by using the main device ME, the telephone, and the transmission frame as described above will be described below.

First, referring to FIG. 1, the operation of system initialization performed immediately after the main device ME is powered on will be described.

When the main power of the main unit ME is turned on and is in the operating state, R
Transmission of the frame shown in FIG. 5 is started on the line. At this time, the main processor MP sets the value of the DE bit to “0”,
Notify the phone that it is in the process of system initialization control.

Each telephone receives the above frame, detects a frame number that appears periodically, and establishes synchronization. This makes it possible to grasp which position in the multiframe the signal received at each time point corresponds to. When the synchronization is established, the value of the DE bit is checked first, and if the value is "0", the control from the main device ME is awaited.
(The operation when DE = 1 will be described later.) The main control unit CC of the main device ME refers to the telephone identification number table TENT after securing the time required for each telephone to establish synchronization, and "corresponds to it". The telephone identification number TEN registered as "there is a telephone" is sequentially taken out, and a "TEN inquiry" signal is transmitted via the DR0 channels of all buses in the system. The "TEN inquiry" signal includes the telephone identification number TEN as parameter data.

Each phone receives this signal and the microprocessor KT
P determines whether the telephone identification number TEN in the received signal matches the number held in the telephone number holding circuit TENR of the own telephone. If they match, the microprocessor KTP sends a "TEN match" signal to the main device ME via the DT0 channel. If they do not match, the telephone is not activated and waits for the next signal reception.

The main control unit CC of the main unit ME responds to the “TEN inquiry” when “TEN match” is returned from any of the telephones.
The operation for assigning a control channel to the telephone is started. First, the bus number connected to the telephone that has returned a response is identified, and the control signal time slot management table DCT is searched by that value to find an unused time slot. If there is an unused time slot, DR0 the "DCN allocation" signal that consists of the time slot number DCN and the telephone identification number TEN as parameter data.
Send through channel.

By receiving this signal, the telephone set which satisfies the above-mentioned telephone set identification number TEN can recognize the D channel that can be used by the own telephone set. The microprocessor KTP holds the assigned time slot number in the control channel number holding circuit DCR, activates transmission / reception of the control signal for the time slot, and sends a "DCN confirmation" signal as a response to the above signal through this channel. Send out.

When the synchronization of the D channel on the T line is established, the main control unit
The CC sets the corresponding bit in the control signal time slot management table DCT to "1" to register it as a busy state, and sets the value of the s bit of the D channel on the R line to "1" for synchronization. Display the established status.

Further, the main control unit CC refers to the telephone identification number table TENT, and refers to the address corresponding to the telephone whose time slot number DCN has been assigned, "the connected bus number of the telephone" and "the assigned time slot". Number DCN "
The phone identification number TEN
The reference data is registered in the telephone accommodation position number LEN conversion table NXT.

Further, the main control unit CC reads "function allocation information for buttons and lamps" from the telephone identification number table TENT,
This is used as initial setting data and transferred to the telephone through the D channel.

Explaining the initialization data in more detail, its contents consist of "button / lamp number-station line number correspondence data" and "connection restriction information", and "button / lamp number-station line number correspondence data". This is the information that shows the correspondence between the station line button / lamp number on the telephone and the system line number. "Connection restriction information" means that the station lines are tenanted in groups. (A) Tenant class information: information on whether or not the phone is included in the tenant (b) Calling class information: information on whether or not the call can be sent to each station line (c) ) Receiving class information: It consists of information on whether or not it is possible to handle incoming calls from each station line.

The telephone sets the received initial setting data in the line data table LDT, and enters the standby state when the reception is completed.
During this time, the telephone set waits for the start of call processing acceptance in the main control unit CC while sending a "NOP" signal to the T line.

The control of the time slot number DCN allocation for one telephone is completed by the above series of procedures.

The main control unit CC continues this control while sequentially incrementing the value of the telephone identification number TEN. Phone identification number table
When the above control is completed for all numbers registered as having telephones in TENT, a unique time slot number DCN is given to all telephones in the system. This number is differently set between the telephones connected to the same bus (however, there is a telephone having the same time slot number DCN on different buses).

This means that the combination of the bus number and the time slot number DCN can be associated with the telephone identification number TEN in a one-to-one correspondence.

If the response from the telephone to the "TEN inquiry" from the main control unit CC is not detected for a certain period of time or more, the main control unit CC stops the process related to the telephone identification number TEN and responds to the new telephone identification number TEN. Start processing. At this time, the telephone that did not respond is ignored as it is not incorporated in the system.

When the above procedure is completed, the main control unit CC enters the exchange processing service accepting state, which means that the DE bit of the R line is set to "1".
And send it to notify all telephones. After that, the main control unit CC always keeps the DE bit at "1" during the normal operation of the system.

On the other hand, in the telephone, the microprocessor KTP detects DE = 1 and enables various inputs such as dials, line buttons, function buttons, etc., and when the input signal by the user's operation is detected, the T channel is assigned by the assigned D channel. To send a control signal to. In addition, an instruction from the main control unit CC is sent to the broadcast channel (DR0) and the individual ratio channel (DRi, where i = 1.
~ 23), and perform the operation predetermined by the program.

The operation of the entire system will be described by taking as an example the case where the telephone KT10 responds to an incoming call from the office line CO1. Where KT
For telephone 10, the telephone identification number TEN is "10" and "1" is assigned as the control signal time slot number DCN.

When there is an incoming call on the curve CO1, the central line trunk TRK1 detects a ringing signal and informs the main control unit CC of this.

The main control unit CC is connected to the D of all buses via the bus control circuit BCC.
Send the control signal of "calling CO1 for station line" by R0 channel.

The signal is received by all phones in the system.
Each phone refers to the line data table LDT and
Based on the lamp number-office line number correspondence data, it is determined whether or not the own telephone has a lamp corresponding to CO1, and if there is a corresponding one, the lamp lighting mode is determined based on the incoming control data. To do. For example, if CO1 is specified as a class capable of receiving an incoming call, the lamp will blink at regular intervals to display the incoming call status. On the other hand, if CO1 is specified as the incoming call control class, the lamp is lit constantly and the usage status is displayed.

When the telephone enters the off-hook state and the office line button (button number 1) corresponding to the office line CO1 is pressed, the microprocessor KTP sends the control signals "off hook" and "press button number 1" through the DT1 channel.

In the main device ME, the main control unit CC receives the above signal via the bus control circuit BCC. Bus control circuit BCC to main control unit CC
A time slot number is added to the signal supplied to the main control unit CC by indexing the telephone identification number TEN and the telephone accommodation position number LEN conversion table NXT based on this and the bus number. Determine the identification number TEN.

The main control unit CC searches the telephone identification number table TENT based on the above value, and determines what the station line number corresponding to the button number 1 is.

The main control unit CC further activates the incoming call response process since the corresponding station line CO1 is receiving an incoming call.

That is, the main control unit CC drives the trunk line TRK1 and closes the loop circuit for the curve CO1.

The main control unit CC sends a "station line CO1 in use" signal by the DR0 channels of all buses, and a "station line CO1 self-use" signal through the DR1 channel of the bus to which the calling telephone KT10 is connected. To do.

Of the above, the first signal is received by all phones in the system. Each telephone determines whether or not the button and lamp corresponding to the central office line CO1 are in its own telephone by the line data table LDT, and if there is a corresponding one, the lamp is steadily turned on. On the other hand, the second signal is the calling telephone.
Only received by KT10. In response to this signal, the microprocessor KTP of the calling telephone changes the station line lamp corresponding to the station line CO1, which has been set to the steady lighting state, to the blinking display indicating the self-use state.

The main control unit CC refers to the call signal time slot management table BCT, checks the usage state of the telephone signal time slot on the bus to which the calling telephone is connected, and finds an unused time slot. After this, DR of the relevant bus
"Call signal time slot allocation" via 1 channel
Signal transmission, time slot management table for call signals
The corresponding bit on the BCT is registered as a use state, and the speech path switch SW is driven to connect the speech signal time slot to the office line trunk TRK1.

The signal is received only by the calling telephone. In response to this signal, the microprocessor KTP causes the call channel number holding circuit BCR to hold the designated time slot number for the call signal and sets the call path. As a result, a call path is set up between the telephone KT10 and the office line CO1.

A more detailed description will be given below regarding the operation of the display control of the station line lamp.

It is generally considered that it is uncertain which of the two signals sent by the main control unit CC is received first by the calling telephone set KT10. As noted above, DR
If the "station line CO1 busy" signal from channel 0 is received first, the lamp control may be executed in the order received, but if this order is reversed, the telephone KT10 that should display its own use status The lamp will be in normal use, causing problems. In order to solve this, the following two methods can be adopted.

One is a method in which the main control unit CC sends the above two signals at appropriate time intervals. In this case, the microprocessor KTP unconditionally processes the signals in the order of arrival, but the main control unit CC needs to strictly manage the order of sending the control signals, which complicates the processing.

The other one is to make up for the above-mentioned drawbacks, in which each telephone always stores the display state of the lamp (that is, the use state of the corresponding line), and it is received from the broadcast channel DR0 according to the stored content. This is a method of determining which of a simultaneous command to be performed and an individual command received from the individual channel DR1 should be responded to.

In order to realize the latter method, it is basically necessary to determine that only the command from the individual channel is followed when the own telephone causes the current line state. As a specific example, when the line is in a call due to a call origination or call answering action of the telephone (the corresponding lamp is in the self-use status display), or the line being held is held by the telephone. The case (corresponding lamp is in the self-holding state) corresponds to this.

Explaining the case equivalent to the above in detail, the operation of the telephone follows only the signal from the individual channel DR0 when the lamp is in the self-use state, and the operation of the individual channel and the broadcast channel in the incoming call and the general use state. Since it is specified to follow signals from both sides, (1) From the main control unit CC to the broadcast channel, the signal "station line" is sent first.
If "CO1 in use" is sent out, the lamps of all the telephones are in the incoming state, so the lamp is displayed as a general use state according to this command. ", But phone K
The T10 responds to this signal and changes the lamp to a self-usage indicator.

(2) From the main control unit CC to the individual channel, the signal "station line"
If "CO1 self use" is sent, this signal is sent to the telephone KT1.
Received by 0 only. Since the lamp of the telephone KT10 is in the incoming state, the display is changed to the self-use state in response to this signal. After this, send a signal to the broadcast channel
When "1 busy" is sent, the telephone KT10 does not respond to this signal, but the other telephones respond to this signal and change the lamp to the general use state.

The latter method complicates the signal processing in the telephone to some extent, but is effective because it simplifies the processing of the main control unit CC where the load tends to concentrate, and is a very effective method.

Next, the operation when the telephone is disconnected from the bus BUS1 and moved to another bus BUS2 and connected while the system is operating will be described.

It is assumed that the telephone has been given "1" as the time slot number DCN. When the telephone is disconnected from the bus BUS1, the main device ME loses the signal reception of the DT1 channel and cannot detect the start bit. The bus control circuit BCC sets the s bit of the DR1 channel to "0" when this state continues for a certain number of times (for example, four times) continuously. Also, the corresponding bit on the control signal time slot management table DCT is set to "0" to display the unused state of the channel.

In addition, telephone identification number TEN and telephone accommodation position number LEN
The conversion table NXT is referenced to determine the phone identification number TEN for that phone, and the phone presence / absence identification information on the phone identification number table TENT is set to "none", and the phone identification number TEN / phone accommodation position number LEN conversion table Erase control data on NXT.

When the telephone is connected to the bus BUS2, four telephones are already operating on BUS2 and the time slot number DCN
It is assumed that items 1 to 4 were in use (see FIG. 2). When the telephone is connected to BUS2 and starts receiving signals, the DE bit on the R line is "1" because the system is already in operation. The telephone can thereby identify that the state is different from that at the time of system initialization (DE = 0). In this case, the telephone sends a "time slot number DCN request" signal containing the telephone identification number TEN as a parameter to the DT0 channel.

When this is received by the main unit ME, the main control unit CC checks the telephone identification number table TENT and confirms that the telephone presence / absence information is not "present". This is to prevent multiple telephones having the same telephone identification number TEN from existing in the system.

When the confirmation is obtained, the BUS2 corresponding part of the control signal time slot management table DCT is referred to search for an unused time slot number DCN. In this case, DCN = 6 is unused and the corresponding bit is "0". Based on this result, the main control unit CC gives “time slot number DCN”
After the signal is transmitted, the control proceeds thereafter in the same procedure as the system initialization. After the series of steps, DE
Since = 1 is set, the telephone is ready to receive service immediately.

In the above process, since the service data transferred from the main control unit CC of the main unit ME when reconnecting the telephone is read from the same telephone identification number table TENT, even if the connection point is moved, it is the same as the original. It is possible to operate under service conditions.

Further, even when the telephone is newly connected to the bus in operation, the operation similar to the latter half of the above makes it possible to be incorporated into the system and operate while the system is in operation.

On the other hand, when the two telephones KT are simultaneously connected to the same bus, there is a possibility that the two telephones KT simultaneously start sending "time slot number DCN request" signals to the broadcasting D channel. In this case, both signals will cause mutual interference on the bus, and the signal received by the main device ME will be a combination of both signals. Where each phone
Since the KTs are given different telephone identification numbers TEN, the main device ME cannot receive the original normal signal.

As a result, the telephone KT cannot acquire the control signal time slot by the "DCN allocation" signal. If such a state continues for a certain period of time or longer, the telephone set a waiting time determined based on the value of TEN (for example, [TEN
Value] × [time of 4 frames]), and the “DCN request” signal is transmitted again. In this way, each telephone is assured of signal transmission without interference with other telephones, and can obtain the DCN properly.

Although the number of bus lines connected to the main unit ME is limited to two for simplification of the description above, the telephone identification number table TENT, the control signal time slot management table DCT, the call signal time slot management table BCT, telephone identification number TEN, telephone accommodation position number LEN conversion table NXT
By expanding the address space of, the same technique as described here can be applied to a system accommodating a larger number of bus lines.

Further, the method of constructing the transmission frame has been described assuming that the frame period is 125 μS, the number of B channels in the frame is 8, and the number of D channels is 1. However, the scheme of the present invention is also applicable to configurations in which these values are changed. Easy to apply.

For example, as shown in FIG.
A method of setting 250 μS and doubling the amount of information (the number of bits) in the channel while keeping the number of B channels in the frame at 8 can be considered. If this method is adopted, the guard time between channels can be increased compared to t1 in FIG. As a result, the time margin for overlapping signals between channels increases, and the line length to the telephone can be increased.

Further, the operation of transferring the data on the telephone identification number table TENT of the main apparatus to the telephone has been described only in the initial setting state, but the same data transfer as this can be performed in the general operating state. Is possible. By using this function, it is possible to change various operating conditions such as changing the office line assignment for the line button of the telephone.
It can be arbitrarily performed even when the system is in operation.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the correspondence between the office line lamp provided in each telephone and the office line accommodated in the main device is determined by the main device at the start of operation of the telephone. Since the telephone has been notified, the main processor of the main unit has to issue a control signal composed of a set of a station line number and control contents only once at a time. Receiving this, each telephone autonomously executes the lamp control. As a result, the main processor does not need to send a control signal corresponding to the telephone, and the processing load is greatly reduced.

In addition, when it is desired that the display of the lamp corresponding to the same station line be different from that of other telephones on a specific telephone, the main processor sends the signal by the individual channel for the specific telephone and the signal by the broadcast channel for the general telephone. For both of the above, there is no need to manage the sending order and the time interval, and the control logic is greatly simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a key telephone device control system as an embodiment of the present invention, and FIG. 2 is a configuration example of information stored in a control signal time slot management table DCT in FIG. 3 is an explanatory diagram showing an example of the configuration of information stored in the time slot management table BCT for speech signals in FIG. 1, and FIG. 4 is a diagram on the bus line BUS1 or BUS2 in FIG. FIG. 5 is an explanatory diagram showing a frame configuration example of a signal transmitted, and FIG. 5 is an explanatory diagram showing a multi-frame configuration example of a signal transmitted on the bus line BUS1 or BUS2 in FIG. 1, and FIG. 5 Control signal time slot management table DCT, eg DR
0 is an explanatory view showing a configuration example of a control word transmitted by 0, FIG. 7 is an explanatory diagram showing another example of a frame configuration of a signal transmitted on the bus line BUS1 or BUS2 in FIG. 1, Is. Explanation of symbols ME …… Main unit, MP …… Main processor, CC …… Main control unit,
TENT: Telephone identification number table, DCT: Control signal time slot management table, BCT: Call signal time slot management table, NXT: Telephone identification number / accommodation position number conversion table, KT: Telephone, TRC ... … Transmission control circuit, SPC …… call circuit, KTP …… microprocessor, LDT …… line data table, DCR …… control channel number holding circuit, BCR …… call channel number holding circuit, TEN
R: Telephone identification number holding circuit,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Iwazen Iwazen 1-2356 Takeshi, Yokosuka City, Kanagawa Prefecture NTT Communications Corp. Complex Communications Research Laboratory (72) Yosuke Sakai 1-2356 Takeshi, Yokosuka City, Kanagawa Japan (72) Inventor Seiya Uchida 1-741 Kugayama, Suginami-ku, Tokyo Inside (72) Iwasaki Telecommunications Co., Ltd. (72) Kenji Tanaka 260 Kitakata, Takatsu-ku, Kawasaki-shi, Kanagawa Nihon Tsushin Kogyo Co., Ltd. (56) Reference JP-A-60-218997 (JP, A)

Claims (2)

[Claims] 1. A plurality of telephones each having a plurality of numbered line status indicators, and a plurality of telephones accommodating a plurality of numbered lines and indicating the lamps corresponding to the lines in response to changes in the line state. A key telephone device comprising a main unit for instructing the telephone to the telephone via a bus, wherein the telephone has a first table for holding a correspondence between a line number and a lamp number, and a line number and a connection restriction condition for the line. A second table holding a correspondence relationship with
The main unit uses the line number as an index to notify the telephone of the use state of the line, and the telephone refers to the first table to determine the lamp number to be controlled, and further obtains by referring to the second table. A control method for a key telephone device, wherein which of a plurality of lamp blink patterns is to be applied is determined according to the contents of the connection restriction condition. 2. The control system for a key telephone device according to claim 1, wherein each of the first and second tables of the telephone is composed of a rewritable memory, and the table is changed by an instruction from the main device. A control method for a key telephone device characterized in that the contents can be arbitrarily set or changed.