JPS62262597A - Control system for telephone device - Google Patents

Abstract

PURPOSE:To shift optionally a telephone set in a system by updating and controlling successively the corresponding relation of the physical connecting position information of individual telephone sets and the terminal number inherent to the individual telephone sets. CONSTITUTION:Telephone sets KT11, 20 and 21 connected by extension buses BUS 1 and 2 to a main device ME are equipped with a telephone sent terminal number holding circuit TENR, a micro processor KTP, a control channel number DCR, a call channel number holding circuit BCR and a transmitting control circuit TRC. The main device ME is equipped with a bus control circuit BCC, a terminal number identifying table TENT, a time slot control table DCT for a control signal, a time slot control table BCT for a calling signal and a terminal accommodating position number converting table NXT. Thus, the accommodating position and the terminal number information can be successively transmitted and received between respective terminals and the main device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control system for telephone equipment, and particularly relates to a communication system configured by accommodating a plurality of time-division transmission lines connected to a plurality of telephones in a plurality of main equipment. This invention relates to a control method that allows a telephone to receive the same service before and after moving a telephone across arbitrary transmission lines in a system.

(Prior Art) In recent years, in communication systems such as button telephones, signal transmission between a main device with a switching function and the telephones connected to it has been decentralized, and multiple telephones are connected to a common line and can be connected individually. A method of time-division multiplexing the information exchanged with telephones is being considered.

In a conventional system of this type, the usable time slots of eleven telephones were fixedly assigned by a mechanical switch installed inside the telephone. In this case, signal collision on the line is avoided by ensuring that time slot numbers do not overlap between telephones on the same line. be able to. Therefore, even if the connection point of the telephone is moved within the same line, operation can be continued without any problem.

(Problems to be Solved by the Invention) The above-mentioned conventional techniques have the following problems. In other words, since a plurality of such lines exist in a general communication system, if a conventional transmission method is used in this case, the following problems will occur. In other words, if a telephone is moved to a different line, there is a high possibility that there will be a telephone on that line that has the same time slot number as that telephone, and in this case two telephones will be assigned to the same time slot. The signals sent by the devices will collide, and normal operation will no longer be possible.

Furthermore, even if signal collisions could be avoided, the control content that a telephone receives is generally fixed and set according to time slots, and as a result of moving the telephone, the services that can be received with that telephone may change. (For example, the meaning of phone numbers and function selection buttons) will change.

An object of the present invention is to provide a control method that allows a telephone to be moved arbitrarily within a system while keeping its service conditions unchanged.

(Means for Solving the Problem) The present invention assigns a unique terminal number to each telephone, and manages the correspondence between the physical connection position information of the telephone and the terminal number while updating the correspondence from time to time. At the same time, the most important feature is that call processing control is executed using the terminal number as a parameter.

This system differs from the conventional system in that a telephone can be moved between different transmission lines, and that the content of the services that can be received before and after the movement remains unchanged.

As a concrete solution, we configured a control system for the telephone device as follows.

That is, - telephones assigned terminal numbers that do not overlap with each other, and a time division multiplex transmission line to which a plurality of the telephones are connected;
In a communication system in which a main device that accommodates a plurality of transmission paths and controls a plurality of telephones individually assigns time slots on the transmission paths to the telephones and sends and receives control signals, The control signal to be sent includes at least a 1-bit synchronization signal, and the main device includes a synchronization detection circuit that determines the normality of the synchronization signal, and a transmission line number and a time slot number that correspond to the terminal number. C
A first storage means for storing service conditions and a second storage means for storing service conditions corresponding to terminal numbers, and when the synchronization detection result becomes abnormal, the corresponding portions of the first and second storage means are provided. When a new synchronization is detected, the terminal number is received from the telephone and the contents of the first storage means are updated, and the contents of the second storage means are re-enabled. The second storage means is referred to to execute call control, and the first storage means is referred to to input and output control signals to and from the telephone.

(Function) As a means to solve the problem, the control system for the telephone equipment has been configured as described above. By assigning unique terminal numbers to all telephones in the system, it is possible to avoid multiple paths within the system. Even if a transmission path exists, it is possible to connect a phone to any path and operate it, and even if a phone that is already connected to one path is disconnected and moved to another path. , you can receive the same service as before, i.e. with the service conditions of your phone unchanged,
This allows for arbitrary movement within the system.

(Example) As an example of a communication system to which the present invention is applied? Figure 1 shows the configuration of the telephone telephone device, Figure 2 shows the configuration of the information stored in the control signal time slot table DCT of Figure 1, and Figure 3 shows the information stored in the control signal time slot table DCT in Figure 1. Figure 4 shows a diagram of the configuration of information stored in the time slot management table BCT, Figure 4 shows a frame diagram of the signal transmitted on the bus line BUSI or BUS2, and Figure 5
The figure also shows a multi-frame configuration diagram of signals transmitted on the bus line BUSI or BUS Z, and Figure 6 shows the control signal time slot management table DC in Figure 5.
FIG. 7 shows a configuration diagram of a control word transmitted by T, for example, DRO. There is a bus line BUSI (*) shows and explains another frame configuration diagram of a signal transmitted on BUS2.

In Figure 1, ME is the main device, KT 10.11°2
0.21 is a telephone set (KTIo, 11 is an extension line) and is connected to the main device ME via a 9-slice line BUS1.

Similarly, KT 20.21 is connected to the main device ME via the extension line BUS 2. Each line BU
S1 and BUS2 each consist of two pairs of transmission lines, one pair of which is a line for transmitting signals sent from each telephone to the main device ME, and is hereinafter referred to as a T line. The other pair of lines are lines for transmitting signals sent from the main device ME to each telephone, and are hereinafter referred to as R lines.

On the bus line, speech signals and control signals are time-division multiplexed and transmitted. That is, when transmitting signals on a bus line, a certain 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 transmitting call signals and for transmitting control signals, and communication between the main device and each telephone is realized by appropriately assigning these time slots according to the telephone. .

Since the configuration of each telephone in FIG. 1 is the same,
The structure of the filter will be explained to KTIO. The telephone KTIO includes a transmission control circuit TRC, a speech circuit spc, a telephone control circuit KTC, a telephone number holding circuit TENR1 a control channel number holding circuit DCR1 a speech channel number holding circuit BCR
It is composed of various parts. The transmission control circuit TRC sends a signal to the T line via the line driver DRY, and receives a signal from the R line via the line receiver RCV. 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.
Only during the period when the EN output is 'II', the output signal from the 5OUT terminal of the transmission control circuit TRC is applied to the T line. EN
During the period when the output is "0", the output terminal of the line driver DRV is in a high impedance state.

The telephone communication circuit spc consists of a handset H8 and an analog/digital converter (A/I) for audio signals.
Digital input/output terminals of the digital converter C/D are connected to the transmission control circuit TRC via the audio information line BL.

The telephone control circuit section KTC is mainly composed of a microprocessor KTP, and detects input from various button Y such as line selection buttons, function buttons, and dial buttons, as well as displays various display functions such as line lamps and function lamps. The circuit provided controls the DSP. The microprocessor KTP also controls the transmission control circuit TRC via the control signal line DL.
The control signal is connected to the main device ME via this line, and control signals are sent and received to and from the main device ME. Furthermore, the telephone control circuit section KTC includes a line data table LDT for storing which actual 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 T unique to the telephone.
This is a circuit for setting and maintaining EN, and can be configured using a mechanical contact switch or a contingency memory. All telephones in the system are assigned 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 specifying 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 DCH, the transmission control circuit TRC takes in this information. As a result, the control signal that the microprocessor KTP exchanges with the transmission control circuit TRC is transmitted on the path using the designated time slot.

The communication channel number holding circuit BCR is a renostar for specifying the number of the communication signal time slot that can be used by the telephone among the time slots multiplexed on the path. When the microprocessor KTP sets a predetermined number in the communication channel number holding circuit BCR, the transmission control circuit TRC takes in this information. As a result, the speech signal that the speech circuit SPC exchanges with the transmission control circuit TRC is transmitted on the path using the designated time slot.

As is clear from the above explanation, each telephone set is controlled by the microprocessor KTP within the telephone set to select a predetermined time slot from among a plurality of time slots for control signals and time slots for speech signals multiplexed on the path. It is possible to select a time slot and transmit and receive call signals and control signals to and from the main device ME.

The main device ME includes a path control circuit BCC, a communication path switch S
It is composed of a W1 office line trunk TRK and a main control section CC.

The path control circuit BCC is arranged corresponding to the path line BUS, and in FIG.
2, BCC2 is used. Each path control circuit BCC sends and receives multiplexed call signals to and from the call path switch SW via the highway UW, and also sends and receives control signals to and from the main control unit CC via the internal data line DB. Send and receive. Further, the path control circuit BCC multiplexes the call and control signals transmitted and received within the main device ME onto the bus line BUS, and transmits and receives the signals to and from the telephone. There is a one-to-one correspondence between time slots for communication signals on the path line BUS and time slots on the highway.

The control signal transferred on the internal data line DB includes, as address information, the number of the control signal time slot to which the signal is transferred on the bus line BUS. When the path control circuit BCC receives a control signal from the path line BUS, the path control circuit BCC adds the time slot number in which the received signal was present to the actual data and sends it to the main control unit CC via the internal data line DB. . Conversely, when transferring a control signal from the main control unit CC to the path control circuit BCC, the main control unit CC adds the time slot number on the path line BUS to be sent to the actual data and transfers the control signal to the path control circuit BC.
Notify C. The path 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 closes a DC loop for the office line CO, sends a dial signal, etc. according to instructions from the main controller CC, and notifies the main controller CCK of the detection results of incoming signals. It also converts the audio signal into analog/digital and transmits it to the communication path switch SW.

The main control unit CC is mainly composed of the main processor MPft, and manages system data and controls the operation of each part of the system. System data is telephone identification number table TEN
T-control signal time slot g table OCT,
It is held in the call signal time slot management table BCT1 and the telephone identification number group T/telephone housing location number LEN conversion table NXT. The telephone identification number table TENT is configured using the identification number TEN as an address, and holds the following information.

・Operational status of the telephone with the identification number TEN (in motion, moving, unregistered) ・Path number to which the telephone is connected ・Time slot number for control signals assigned in the path ・R of the telephone Information on function allocation to buttons and lamps and other service-related data (speed dial number information, etc.) An example of the configuration of the control signal time slot management table DCT is shown in FIG. The control signal time slot management table DCT uses the path line BUS number as an address, and one address is assigned to each control signal time slot on the path.
It is constructed by arranging control words made up of corresponding bits, and the distinction between used and unused time slots is stored by 1.0 of each bit. When using the transmission frame shown in FIG. 4, which will be described later, the word length of the control word is 23 bits. FIG. 2 shows an example corresponding to this.

In order to be able to send and receive control signals to and from individual telephones, main processor MP allocates individual time slots for control signals to each telephone at the system initialization stage.

After this control is performed, the pair of path line BUS number and time slot number DCNO corresponds to the telephone identification number TEN on a one-to-one basis. The former set of numbers is referred to as a telephone accommodation position number LEN. The correspondence between these two is stored in the telephone identification number TEN/telephone housing position number LEN conversion table NXT.

FIG. 3 shows an example of the configuration of the call signal time slot management table BCT. The call signal time slot management table BCT uses the path line BUS number as an address, and one address is assigned to each control signal time slot on the bus.
It is constructed by arranging control words made up of bits associated with each other, and the distinction between used and unused time slots is stored by 1 and 0 of each bit. When using the transmission frame shown in FIG. 4, which will be described later, the word length of the control word is 8 bits. Third
The figure shows an example that corresponds to this.

An example of a frame structure of a signal transmitted on paths BUS 1 and BUS 2 in FIG. 1 is shown in FIGS. 4 and 5.

Figure 4 (,) shows the frame structure of the R line.
TSBRO~7 is a time slot for audio signals, TSDR
is a time slot for control signals, TSF is a time slot for frame signals, TSS is a time slot for system control signals, and TSG is a time slot for guard pits. Frame repetition period, ie, Fig. 4(a)
The time from the beginning to the end is 125 μs, and 128 bits of information exist during this time.

(Time slot for audio signal) TSBRO~7 each consists of 8 pints of audio information (br-rO-br7) and is used for transmitting audio PCM codes or digital data.

The control signal time slot TSDR consists of 10 bits and is used to transmit telephone control signals from the main device ME to each telephone. To be more specific, this IO bit is an 8-bit control word (drO-dr7).
, a control word, a gritty bit p, and a synchronization status indicator pin)s.

The guard pit time slot TSG is inserted between the valid information time slots and holds 6 bits worth of card pits).
(gbO-gb5) is transmitted. Originally, this time slot was used to ensure timing so that information transmitted in adjacent time slots on the T line would not overlap with each other, but this time slot is used for the purpose of transmitting additional information from the main device ME to the telephone set. It is also possible to use

time slot for system control signals) TSS is main device M
DE- for displaying the operating status of the main processor in E
The timing pit (rtO = rt3) is used to notify bits and various timing information.

Also - this part; City Yoai Aida Kuijin Slot TSBR
7 and the control signal time slot TSDR.

In the frame signal time slot TSF, 2 of 7 bits
The number of the frame expressed in base number (t or 6) is transmitted. This portion also serves as a guard pit between the control signal time slot TSDR and the speech signal time slot TSBROO.

FIG. 5 shows the multi-frame structure of the R line and the information transmitted in each time slot. A multifrenime consists of 96 consecutive frames. The value (frame number) of the frame signal time slot TSF is "O" in the first frame, and is incremented sequentially thereafter, and becomes "95 #" in the last frame.

By identifying this frame number, the phone can establish frame and multiframe synchronization.

BRO~7 are time slots TSB for audio signals, respectively.
It constitutes a channel for voice or data information (B channel) transmitted by RO to 7. The most common use of the B channel is to have the telephone use one time slot in each frame and transmit an 8-bit code in the same time slot every frame, providing a transmission rate of 64 kbps. It is. In addition, one phone can use multiple time slots to achieve 128kbps,
It is also possible to provide high speed transmission such as 192 kbps.

The bit string transmitted in the guard bit time slot (
gb) is a signal that is ignored by the telephone, so 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: DRO to DR23) are defined, and control signals are transmitted through each channel.

The DRO channel is a special channel used for a purpose different from other channels, and is called a broadcast channel. That is, a signal transmitted over a DRO channel is received and processed as a valid signal by all telephones connected to that path. Meanwhile, other channel DRI-DR23
is assigned individually to each telephone connected to the path, and one telephone exclusively uses one channel. Other channels are ignored and not communicated to the processor TKP within the phone. A control method for allocating the D channel to a telephone will be explained later.

Valid information for each D channel consists of 4 bytes. An example of how to use these 4 bytes is shown in FIG. A transmission control signal used for error control etc. is placed in the first byte. The second byte is a command code that instructs the control content, and the third byte is a command code that instructs the control content.
, 4 bytes contain parameter data necessary for executing the control specified by the command code.

For example, if you use a command code to instruct "display",
Display contents of up to 2 bytes can be expressed with noclameter data.

FIG. 4(b) shows the T-line frame structure in correspondence with the R-line frame structure. The T line has a time slot where the telephone can send signals) TSBTO~
7 (for audio signals) and TSDT (for control signals), each time slot is used in pairs with a corresponding time slot on the R line. That is, each telephone transmits a signal on the T line in the same time slot that it receives a signal from the R line.

The signal sent to the audio signal time slots TSBTO~7 is 1c before the 8 bits of audio information (btO~bt7).
2-bit synchronization bit 5tO (="1").

This is a configuration in which 5tl (="0") is added. 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 (dtO to dt7) and 1 bit. An example of a transmission waveform when these signals are transmitted on Tm is shown in FIG. 4(c). Manchester code is used as the transmission code. During the period (11) when all telephones are not sending signals to the T line, the line potential difference of the T line is zero. When the phone starts sending out signals, the start bits are (+V, -V.

-v, -4-v), and is followed by example valid information. The reception of the T-line signal in the path control circuit BCC of the main device ME is started when the line-to-line potential difference changes from zero to a state where there is a significant potential difference between the lines.

If the line length from the main device ME to the telephone is limited to a certain value or less, the time from when each time slot is sent from the main device ME to Ra until the corresponding signal is received from the R line is constant. Limited to below value. From this,
The main device ME can identify the type of the received signal by regarding the signal received within the time as a signal corresponding to the time slot from which it was sent.

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

First, the system initialization operation that is performed immediately after the main device ME is powered on will be explained.

When the main power of the main device ME is turned on and enters the operating state, R
Then, transmission of the frame shown in FIG. 5 is started. At this time, the main processor MP sets the value of the DE bit to "0" to notify the telephone that it is in the process of controlling system initialization.

Each telephone receives the frames and establishes synchronization by detecting the frame number that appears periodically. This makes it possible to know which position in the multiframe the signal received at each point in time corresponds to. When synchronization is established, first the DEBIC value is checked, and if the value is @O'', it waits for control from the main device ME.

(The operation when DE=1 will be described later.) After securing the time required for each telephone to establish synchronization, the main control unit CC of the main device ME refers to the telephone identification number table TENT and assigns 1 to it. The registered telephone identification numbers TEN are sequentially retrieved and the TEN inquiry 1 is sent via the DRO channels of all buses in the system.
Send a signal.

The "TEN inquiry" signal includes the telephone identification number TEN as parameter data.

Each telephone receives this signal and uses a 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 its own telephone. If there is a match, the microprocessor KTP
sends a "TEN match" signal towards the master ME via the DTO channel. If there is a mismatch, the phone will not be activated and will wait for the next signal to be received.

Main control unit CCFi of main unit ME''TEN inquiry''
If a "TEN match" is returned from any telephone, an operation is started to allocate a control channel to that telephone. First, the bus number to which the telephone that returned the response is connected is identified, and the control signal time slot management table DCT is searched for an unused time slot using that value. If there is an unused time slot, its time slot number DCN and telephone identification number TENt-? A 'DCN allocation' signal configured as parameter data is sent via the DRO channel.

A telephone that satisfies the above-mentioned condition of telephone identification number TEN matching can recognize a channel that can be used by the telephone by receiving this signal. The microprocessor KTP causes the control channel number holding circuit DCR to hold the assigned time slot number, activates the transmission and reception of control signals for the time slot, and sends the DCN confirmation "confirmation complete" via this channel in response to the above signal. signal.

When the synchronization of the D channel on the T line is established, the main controller C
C sets the corresponding bit on the control signal time slot management table DOT to @l" and registers it as being in use, and also sets the value of the S pit of the D channel on the R line to "1" to synchronize. The establishment status is displayed.Furthermore, the main control unit CC refers to the telephone identification number table TENT, and displays the address corresponding to the telephone to which the time slot number DCN assignment has been completed, the path number to which the telephone is connected, and the assignment. Write and memorize the time slot number DCN, as well as the telephone identification number TEN.
・Register the comparison data in the telephone accommodation position number LEN conversion table NXT. In addition, the main control unit CC obtains function assignment information for button, U/F from the telephone identification number table TENT.
Transfer to the telephone using the ``N'' channel.

The initial setting data includes: - Information on the allocation of the office line number to the office line key number on the telephone; - Information on the assignment of the office line number to the office line rung number on the telephone.

The telephone registers the received initial setting data in the line data table LDT, and when the reception is completed, it enters a standby state.

During this time, the telephone waits for the main controller CC to start accepting call processing while sending a "N0P (no control)" signal to the T line.

The above series of procedures completes the control of time slot number DCN allocation to one telephone set.

The main control unit CC continues the control while sequentially incrementing the value of the telephone identification number TEN. When the above control is completed for all the numbers registered as telephones in the telephone identification number table TENT, the time slot numbers unique to all telephones in the system are set. ) Different values are set between telephones connected to CN. (However, there are telephones with the same timeslot number DCN for different paths.) This means that the combination of path number and timeslot number DCN can be converted into the telephone identification number TEN.
This shows that a one-to-one correspondence is possible.

Note that if a response from the telephone is not detected for a certain period of time in response to a "TEN inquiry" from the main control unit CC, the main control unit CC will stop processing regarding the telephone identification number TEN, and will respond to a new telephone identification number TEN. Start processing. At this time, telephones that do not respond are ignored as not being incorporated into the system.

When the main control unit CC completes the above procedure, it enters a state in which it accepts exchange processing services, and notifies all telephones of this by setting the DE bit on the R line to @l'' and transmitting it.

From then on, the main control unit CC always uses DE during normal system operation.
-Keep the bit at °1”.

On the other hand, in telephones, the microprocessor KTP and DE=
1 is detected to enable various inputs such as dials, line buttons, function buttons, etc., and when an input signal from a user's operation is detected, a control signal is sent to the T line through the D channel assigned to 1. In addition, instructions from the main control unit CC are sent to the broadcast channel (DRO) and individually assigned channel (DRi).
, where i == 1 to 23), and performs an operation predetermined by the program.

The operation of the entire system will be explained by taking as an example a case where the telephone KTIO makes an outgoing connection to the central office line COI. Here, it is assumed that the telephone identification number TEN of KTIO is "10" and "1" is assigned as the control signal time slot number DCN.

■ Which central office line corresponds to the central office line COI when the telephone is off-hook? When the button (r button number 1) is pressed, the microprocessor KTP sends an "off hook" and - lin number 1 pressed control signal through the DTI channel.

■ In the main unit ME, the main control unit CC is the bus control circuit BCC.
Receive the above signal via. A time slot number is added to the signal supplied from the path control circuit BCC to the main control unit CC.
C indexes the telephone identification number TΔ/telephone housing position number LEN conversion table NXT and determines the telephone identification number TEN of the telephone that made the call.

(2) The main control unit CC searches the stain filler identification number table TENT using the above value, and determines what the station line number corresponding to button number l is.

■ Based on this result, the main control unit CC
K1 is driven to close the Loog circuit to the station line COI.

- The main control unit CC transmits the “Central line COI in use” signal to the DRO channels of all paths, and sends the “Central line COI in use” signal to the DRO channel of the calling telephone KTIO via the DRI channel of the path connected to the calling telephone KTIO.
I own use” signal respectively.

■ Among the above, the first signal is received by all telephones in the system. Each telephone corresponds to the central office line Cot, and it is determined by the line data table LDT whether or not there is a button and a lamp on the own telephone, and if there is a corresponding lamp, the lamp is turned on steadily.

The second signal, on the other hand, is received only by the calling telephone KTIO. In response to this signal, the microprocessor KTP of the calling telephone sets the station line C, which has been set to a steady lighting state, to
Change the station line lamp corresponding to O1 to a blinking display indicating self-use status.

■ The main '+I11 control section CC refers to the call signal time slot management table BCT, checks the usage status of the call signal time slots on the path to which the calling telephone is connected, and searches for an unused time slot. After this,
Sends a "Time slot allocation for 1 call signal" signal via the DRI channel of the corresponding path.

The corresponding bit on the call signal time slot management table BCT is registered as being in use, and the 1 call path switch SW is driven to connect the call signal time slot to the office line trunk TRKI.

■ The above signal is received only by the calling telephone. In response to this signal, the microprocessor KTP causes the designated call signal time slot number to be held in the call channel number holding circuit BCH, and sets a call path. As a result, a communication path is established between the telephone set KTIO and the central office line COI.

A more detailed explanation will be given below regarding the operations of (1) and (2) showing display control of the station line lamp.

It is generally considered that it is uncertain which of the two signals sent out by the main control unit CC in (2) will be received first by the calling telephone KTIO. As noted in ■, DRO
If the 1st station line COI in use signal from the channel is received first, lamp control should be executed according to the order in which it was received, but if this order is reversed, a problem will occur. To solve this problem: The following two methods can be adopted for this. One is for the main controller CC to send out the above two signals at an appropriate time interval. In this case, the microprocessor KTP will send the signals unconditionally. It is only necessary to process the control signals in the order of arrival.Another problem is that control signals related to the same station line lamp are sent to the broadcast channel DRO and the individual channel DRI.
In this method, when multiple signals are received from the individual channel, priority is always given to the signal of the individual channel for processing regardless of the order of arrival. In this case, the main control unit CC does not need to strictly manage the sending order of the two signals.

Next, an explanation will be given of the operation when the telephone is removed from the path BUSI and moved to another path BUS2 to be connected during system operation.

Assume that the telephone has been assigned "1" as the time slot number DCN. When the telephone is disconnected from the path BUS 1, the main device ME stops receiving signals on the DTI channel and is no longer able to detect the start pit. The path control circuit BCC sets the S pit of the DRI channel to 10'' when this state continues for a certain number of times (for example, 4 times) or more.The path control circuit BCC also sets the corresponding pit on the control signal time slot management table DCT to @ O"
and displays the unused status of the channel. Furthermore, by referring to the telephone identification number TEN/telephone accommodation position number LEN conversion table K, the telephone identification number TEN of the telephone is determined.
and sets the telephone presence/absence identification information on the telephone identification number table TENT to "none", and also sets the telephone identification number TEN/telephone housing position number LEN conversion table N.
Clear the control data on XT.

When the filling machine is connected to path BUS2, BU
It is assumed that in S2, four telephones are already in operation, and time slot numbers DCN 1 to 4 are in use (see FIG. 2). When the phone is connected to BUS2 and starts receiving signals, the system is already in operation, so R
The DE-bit on the line is "l#." This allows the telephone to identify that the state is different from when the system was initialized (DE=O). In this case, the telephone
A "time slot number DCN request" signal containing the telephone identification number TEN as a parameter is sent to the O channel.

When this is received by the main device ME, the main control unit CC checks the telephone identification number table T4T and confirms that the telephone presence/absence information is not "present".

This is to prevent multiple telephones having the same telephone identification number from existing in the system. Once confirmed, control signal time slot management table DCT
Refer to the BUS2 corresponding section of , and search for an unused time slot number DCN. In this case, DCN=6 is unused and the corresponding pit is "0#." With this result, the main control unit CC sends a "time slot number DCN assignment" signal, and from then on, the system initialization The control proceeds in the same manner as when the system is installed.When the series of steps is completed, DE=1 has already been set, so the telephone is immediately ready to receive service.

In the above process, the service data transferred from the main control unit CC of the main device ME when the telephone is reconnected is read from the same telephone identification number table TENT, so even if the connection point is moved, the service data will remain the same as before. It is possible to operate under service conditions.

Furthermore, even when a completely new telephone is connected to an active path, it is possible to incorporate it into the system and start operating it while the system is in operation, by the same operation as in the second half of the above.

On the other hand, if two telephones KT are connected to the same path at the same time, there is a possibility that the two telephones KT will start sending out "time slot number DCN request" signals to the broadcasting D channel at the same time. In this case, the two signals will interfere with each other on the bus, and the signal received by the main device ME will be a combination of the two signals.Here, each telephone KT has a different telephone identification number TEN. As a result, the main device ME cannot receive the original normal signal.

As a result, the telephone KT cannot obtain a time slot for control signals by the "DCN allocation" signal. If the phone continues to be in this state for a certain period of time, the TEN
The waiting time determined based on the O value (for example, [
T device value] × [time for 4 frames]) and repeat “
In this way, each telephone is guaranteed to transmit a signal without causing interference with other telephones, and can legitimately obtain a DCN.

Above, in order to simplify the explanation, the number of bus lines connected to the main device ME was limited to two; however, the telephone identification number table TENT and the control signal time slot management table D
CT, time slot management table BCT for call signals,
and telephone identification number TEN/telephone housing location number LE
The same technique described here can also be applied to a system example that accommodates a large number of bus lines by expanding the address space of the N translation table NXT.

In addition, although the method of configuring the transmission frame has been explained 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, the method of the present invention can also be applied to configurations in which these values are changed. Easy to apply. For example, as shown in FIG. 7, a method can be considered in which the frame period J[-250 μs is set, and the amount of information (the number of pits) in the channel is doubled while keeping the number of B channels in the frame at 8.

If this method is adopted, the guard time between channels can be increased compared to tl in FIG. 4. As a result, the amount of time available for overlapping signals between channels increases, making it possible to increase the line length to the telephone set.

(Effects of the Invention) As explained in detail above, by applying the method of the present invention and assigning unique terminal numbers to all telephones in the system, it is possible to create multiple bus transmission lines within the system. You can connect a phone to any bus and operate it even if there is a This has the effect of simplifying the operation of the system by eliminating the need for work associated with moving and installing telephones.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a telephone telephone device according to an embodiment of the present invention, and Fig. 2 is a time slot for control signals shown in Fig. 1). The configuration diagram of the information stored in the embedded table DCT, Figure 3 is the first
A configuration diagram of information stored in the call signal time slot management table BCT shown in the figure, FIG. 4 shows the bus line BU of FIG. 1.
A frame configuration diagram of a signal transmitted on the SI or the same BUSZ, FIG. 5 is a multi-frame configuration diagram of a signal transmitted on the bus line BUSI or the same BUS2 in FIG. 1,
FIG. 6 is a configuration diagram of a control word transmitted by the control signal time slot management table DCT of FIG. 5, for example, DRO, and FIG. 7 is a signal transmitted on the bus line BUS 1 or BUS 2 of FIG. 1. This is another frame configuration diagram. ME... Main equipment, TRK... Office line trunk, SW.
・・Communication path switch, BCC ・・Bus control circuit, HW
...highway, DB...internal data line, CC...
・Main control unit, MP...Main processor, TENT...
・Telephone identification number table, DCT...time slot management table for control signals, BCT...time slot for call signals) 'IQ table, NXT...-telephone housing position number LEN conversion table, KTIO, KTI
I, KT20, KT21...telephone, COI
, CO2-... central line, BUSI, BUS2 ・
...Circular lotus line, TRC...Transmission control circuit, SIN
...Terminal, 5OUT...Terminal, RCV...Line receiver, DRV...Line driver, EN...
Control, DCR...control channel number holding circuit, BC
R...Speech channel number holding circuit, spc...Speech circuit, H8...Handset, ~庺...Analog desotal converter, BL...Audio information line, DL...Control signal line , KTC...Telephone control circuit, KTP...Micro processor, KEY...Various buttons (line selection, function, dial), DSP...Circuit providing various display functions, LDT... Line data table, TENR
...Telephone number holding circuit.

Claims (1)

[Claims] The main device is composed of a telephone assigned a terminal number that does not overlap with each other, a time division multiplex transmission line to which a plurality of the telephones are connected, and a main device that accommodates a plurality of the transmission paths and controls the plurality of telephones. In a communication system in which the telephone individually assigns time slots on the transmission path to transmit and receive control signals, the telephone transmits at least one control signal.
The main device includes a synchronization signal of bits, and the main device includes a synchronization detection circuit that determines the normality of the synchronization signal, and a first storage means that stores a set of a transmission line number and a time slot number in correspondence with a terminal number. , and a second storage means for storing service conditions corresponding to the terminal number, and when the synchronization detection result becomes abnormal, the information in the corresponding part of the first and second storage means is invalidated, and a new storage means is provided. When a synchronization is detected, the terminal number is received from the telephone, the contents of the first storage means are updated, and the contents of the second storage means are made valid again, and the second storage means is referred to. 1. A control method for a telephone device, characterized in that the telephone device is configured to perform call control using the first storage means, and input/output control signals to and from the telephone device while referring to the first storage means.