JP2654026B2 - Digital key telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a digital key telephone apparatus or a simple telephone exchange (hereinafter simply referred to as a digital key telephone apparatus).
More particularly, the present invention relates to a digital key telephone apparatus in which the number of extensions is expanded by connecting a plurality of main units between systems.

(Prior Art) The extension number system of the digital key telephone apparatus is roughly classified into a system called a building block system and a system in which a plurality of main units are connected between systems by a small number of communication paths. The former method is a method in which an extension-dedicated module called an extension frame is stacked on a main device called a basic frame like a block to extend the number of extensions of the main device itself.

In the latter case, for example, by interconnecting a plurality of main units that are installed at a distance of about 300 meters using some of the lines, it is possible to make internal calls between the two frames and receive calls from external lines. The present invention relates to a digital key telephone apparatus suitable for the latter method, in which a simple function such as transfer can be performed.

A conventional configuration of this type of telephone main unit will be described with reference to FIG. There are a plurality of digital key telephone main units 31a to 31c installed hundreds of meters apart, the analog central office interface units 32a to 32b have analog office lines 33a to 33c, and the analog standard telephone interface unit 34a. One or more standard telephones 35 to 34c
a to 35b are connected. One of the main units 31a is a master main unit, and the other main units 31b and 31c are slave main units. One of these interface units for analog office lines and the other is an analog standard telephone interface unit. In the form of cross connection, the master main unit 31a is connected to the other slave main units 31b and 31c via the line 36a.
To 36d. The incoming call from the master main unit 31a to, for example, the slave main unit 31b can be made via the line 36a, and the incoming from the slave main unit 31b to the master main unit 31a is made via the line 36d.
The same applies to the slave main device 31c.

Here, as an example, an operation in the case of an extension intercommunication between the telephone 35a of the master main device 31a and the telephone 35b of the slave main device 31b will be described.

When the handset of the telephone 35a is raised, the master main unit 3
You will hear a dial tone from 1a. Here, when dialing a special number (for example, "7") designating the slave main unit 31b, the call 6 is connected to the slave main unit 31b, and the dial tone of the slave main unit 31b is heard. When the extension number of the telephone set 35b is dialed in this state, the dial signal is sent to the slave main unit 31b, and the telephone set 35b is called, so that a telephone call can be made between the telephone sets 35a and 35b.

Further, the mutual operation between the telephones 35a and 35c is performed by the same operation. However, the special numbers are different numbers.

(Problems to be Solved by the Invention) In the above-described conventional digital key telephone apparatus, voice is converted into digital data and transmitted / received through a time-division multiplexed communication path in the main apparatus. Since the external line network and telephone are for analog use, they are connected via analog interfaces 32 and 34, and connection between systems is also performed via this analog interface. Therefore, when a non-telephone type terminal (for example, a data device) is provided, it is necessary to provide a modulation / demodulation device in order to realize inter-system extension communication between the non-telephone type terminals.

Further, as described above, since the slave main units are connected in a star configuration centering on the master main unit, the number of wirings increases.

Further, even when it is desired to simultaneously call a plurality of slave main units from the master main unit (for example, in the case of broadcast communication), each slave main unit must be individually called and cannot be simultaneously called. There is a problem that the processing load on the apparatus increases and the delay time until the broadcast is finally completed for all the slave main apparatuses increases.

Therefore, the present invention provides a digital key telephone apparatus which can connect a plurality of main units between systems with a small number of wires, does not require a modem even when a non-telephone system terminal is connected, and can simultaneously call a plurality of slave main units. The purpose is to provide.

〔The invention's effect〕

(Means for Solving the Problems) The present invention provides a digital interface in which a master main unit and a slave main unit transmit control data and audio data to other main units as digital codes, respectively, and receive from other main units. A digital interface circuit of the master main unit, the digital interface circuit of the master main unit transmits the control data and the audio data by addressing a slave main unit of a transmission destination, and The addressing can be either simultaneous designation of all slave main units or individual designation of each slave main unit, and the digital interface circuit of the slave main unit is controlled by the master main unit so that all slave units including its own unit are controlled. When the main device is specified at the same time or the address of the own device is specified individually It is intended to provide a digital key telephone apparatus which receives the control data and the voice data only when it is performed.

(Operation) According to the above configuration, transmission and reception of voice and control data between the master main unit and the slave main unit are performed as digital data via the digital interface circuit. Therefore, the inter-system communication between the non-telephone terminals can be performed without the intermediary of the modem.

Also, since the master main unit transmits voice and control data by designating the address of the slave main unit, and the slave main unit receives data only when its own address is specified, a plurality of units can be assigned to one master main unit. Of slave main units can be connected in a multipoint manner. Therefore, even when a large number of main devices are connected, only a small number of wires are required.

Furthermore, it is possible to specify a plurality of slave main units at the same time by specifying an address. In this case, since all of the specified slave main units receive downlink data, a plurality of slave main units can be specified by one transmission operation from the master main unit. Slave slave units can be called simultaneously.

Hereinafter, the present invention will be described with reference to examples.

FIG. 2 is a connection diagram between systems in a preferred embodiment of the digital key telephone apparatus according to the present invention.

As shown in FIG. 2, a plurality of, for example, seven slave main units 2a to 2g are connected to one master main unit 1 by a down system highway 3 and an up system highway 4.
Multipoint connection via a full-duplex serial communication line consisting of

The master main unit 1 transmits downstream data to the downstream inter-system highway 3 and receives upstream data from the upstream inter-system highway 4. Conversely, slave main units 2a to 2g receive downlink data and transmit uplink data.

FIG. 1 is a block diagram showing the configuration of the main device of this embodiment. In the master main unit 1, the time slit conversion of the voice data of the speech highway 11, the data highway 12 for transmitting the digital control data, and the speech highway 11, which is a time-division communication path of the digital voice data (8-bit PCM code), is performed. Time switch to exchange by
13.Slave main unit 2 via highways 3 and 4 between systems
a to 2g, which transmits and receives data to and from the other units in the main unit, and inter-system connection interface unit 14, which transmits and receives data via the speech highway 11 and the data highway 12, to other units in the main unit. A central processing unit 15 for transmitting and receiving digital control data and controlling them is provided, and a master sub-processor 16 for controlling transmission and reception of control data of the central processing unit 15 is provided. Further, although not shown, various interface units for connecting curves and various terminals are also provided,
They are also speech highway 11 and data highway
Connected to other units via 12.

In the inter-system connection interface unit 14, a slave sub-processor 17, which is selected by a slave selection address from the master sub-processor 16 and transmits / receives control data to / from the master sub-processor 16, is described below. A common memory 18 for temporarily storing control data transmitted and received between the microprocessors 20 and the audio data (8) on the designated time slot of the speech highway 11 under the control of the microprocessor 20.
Bit PCM code) to an 8-bit data bus, and vice versa, and a time switch 19 which performs the reverse function, receives voice data from the time switch 19, reads out control data in the common memory 18 and reads it out. A microprocessor 20 is provided which is configured in the format shown in FIG. 3 and serially transmitted to the inter-system highway, and performs the reverse function. Note that the microprocessor 20 inputs the frame synchronization signal on the speech highway 11 to its interrupt terminal INT, so that the time switch 19
The timing of reading the audio data from the speech highway 11 via the interface is synchronized with the time slot position of the speech highway 11.

The configuration of the slave main units 2a to 2g is the same as that of the master main unit 1 described above. However, since the format of data transmitted and received between the systems is slightly different from that of the master main unit as described later, the program of the microprocessor 30 of the inter-system connection interface unit 24 and the like are different accordingly.

FIG. 3 shows a format of data transmitted on the highways 3 and 4 between the systems.

The data transmission method between the systems is a full-duplex serial transmission method and an asynchronous transmission method in which each data (8 bits) is transmitted in 11-bit burst units. In this transmission method, the length of one frame is 125 μsec, which is the same as one frame of the time division multiplex transmission of the audio data in the main unit, and the transmission speed is the audio data (to prevent data loss or double transmission). 64Kb / s (= 8bit)
8kHz x 8bit) and the channel is 2 for audio data.
One channel is provided for the channel and the control data (however, in the case of downlink data, as will be described later, since the control data can be transmitted at the same time as the address designation at the time of transmission of each audio data, the control data is substantially 3 channels).

Each burst has a start bit F (1 bit), data (8 bits), an address /
It is composed of a total of 11 bits of a data select bit A / D (1 bit) and a stop bit S (1 bit). The address / data select bits A / D identify whether the burst transmits audio data B (hereinafter referred to as audio data burst) or transmits the selected address A of the slave main unit (hereinafter referred to as address burst). Is a bit to be done.

In the case of the audio data burst, all 8 bits of the data are allocated to the audio data B. On the other hand, in the case of an address burst, as shown in FIG. 3 (a) (a start bit, an address / data select bit, and a stop bit are not shown in FIG. 3), the preceding 4 bits of the 8 bits are the address. A and the remaining 4 bits are allocated to control data D. The first one of the four bits of the address is one-to-one communication in which the master main unit calls one slave main unit or one-to-multiple communication in which a plurality of (all in the present embodiment) slave main units are simultaneously called. The remaining three bits are used for communication selection, and the remaining three bits are used for individual addressing of each slave main unit in one-to-one communication. For example, the first bit of the address is one-to-one.
Set to "0" for communication, set to "1" for one-to-many communication, and the remaining three bits are set to "1" at the beginning bit
It only makes sense when. Note that this address burst configuration is applied only to the downstream data from the master main unit to the slave main unit. In the case of the upstream data from the slave main unit to the master main unit, the transmission destination is determined to be the master main unit. Since there is no need to specify an address, the data in the burst is composed of only the control data D, as in the third burst (the start bit and the like are not shown) in FIG. 3B.

When the microprocessor 20 of the master main unit 1 outputs data to the highway 3 during the downstream system, it performs the operation after addressing the slave main unit which is the transmission destination. That is, as shown in FIG. 3A, when transmitting audio data, an address burst is transmitted first, and then an audio data burst is transmitted. When transmitting control data, only the address burst is output because the control data D is incorporated in the address burst as described above. In one frame, the transmission of the partial data burst is performed twice, and the transmission of only the address burst is performed once.

The microprocessor 30 of the slave main units 2a to 2g receives the burst sent from the master main unit 1 and identifies whether it is an address burst or a voice data burst from the address / data select bits A / D. .
If it is an address burst, the first one of the data
It is determined from the bit whether one-to-one communication or one-to-many communication.

In the case of one-to-many communication, all the slave main units 2a to 2g receive the subsequent 4-bit control data D, and if the subsequent burst is an audio data burst, the audio data B
To receive. In addition, as for the transmission of the uplink data at this time, only the slave main unit for which a predetermined response operation has been performed at the terminal with respect to the incoming call is permitted to transmit, and as shown in FIG. In response, the audio data B or the control data D is transmitted to the upstream intersystem highway 4.

On the other hand, in the case of one-to-one communication, the microprocessors 30 of the slave main units 2a to 2g receive 4 bits from the second bit of the received data.
The address A up to the bit is read and compared with the address of the own device registered in advance as operation / maintenance data at the time of installation. As a result, only the slave main unit having the matching address receives the subsequent 4-bit control data D,
Further, if the next burst is an audio data burst, the audio data B is received, and the highway 4 between the upstream systems is received.
To send upstream data. On the other hand, the other slave main units whose addresses do not match are in a standby state, and do not receive or transmit until the reception of the next address burst.

Next, the operation of the digital key telephone apparatus according to the present invention configured as described above will be described by taking as an example the case where a telephone connected to the extension of the master main apparatus makes simultaneous extension calls to the telephones of all slave main apparatuses. I do.

When the handset of the telephone connected to the master main unit is lifted, the dial tone of the master main unit 1 is heard. In this state, when a special signal (for example, "90") for simultaneously ringing extensions is dialed, the dial data is transmitted to the data highway.
12, central processing unit 15 via master side sub-processor 16
Is received. The central processing unit 15 decodes the data and sends control data from the master-side sub-processor 16 to the slave-side sub-processor 17, and the data is written to the common memory 18 by the slave-side sub-processor 17. Thereafter, the microprocessor 20 reads the control data from the common memory 18, sets "1" to the first bit of the data of the address burst based on the control data, and sets the control data for notifying the incoming call to the subsequent 4 bits to set the control data to notify the downstream system. Send to highway 3.

The microprocessors 30 of all the slave main units 2a to 2g that have received the data determine the one-to-multiple communication from the first bit of the data, and receive the subsequent 4-bit control data and write it to the common memory 28. The control data is read out by the slave side sub-processor 27 and sent to the master side sub-processor 26. The central processing unit 15 decodes the read out control data and performs an incoming call operation on a telephone connected to the own apparatus. In this way, the telephones of all the slave main units 2a to 2g are called simultaneously, and if one of the slave main units answers, a call is started between the telephone and the master telephone.

The transmission and reception of voice data at the time of simultaneous calling are performed as follows. The microprocessor 20 of the master main unit 1 controls the time switch 19 to read audio data from the corresponding time slot of the downstream speech highway 11. Then, an address burst in which "1" is set in the first bit of the address is prefixed, and the burst of the audio data is transmitted to the down-system highway 3. When this is received by the microprocessors 30 of all the slave main units 2a to 2g, the voice data is transmitted to the corresponding time slot of the speech highway 21 via the time switch 29.
The voice data is exchanged by the time switch 23 and transmitted to the called telephone.

Conversely, the procedure for transmitting audio data and control data from the slave main unit to the master main unit is also substantially the same as described above, and a description thereof will be omitted.

〔The invention's effect〕

As described above, according to the present invention, since voice and control data are transmitted and received between systems via the digital interface circuit, communication between systems of non-telephone terminals can be easily performed without using a modem. Can be realized. Further, since the systems can be connected at a multipoint via the interface, there is an advantage that the number of wirings can be reduced even when a plurality of main devices are connected. Furthermore, when the slave main unit is addressed from the master main unit, a plurality of slave main units can be specified at the same time, so that a plurality of slave main units can be simultaneously called.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a digital key telephone apparatus according to the present invention, FIG. 2 is a connection diagram between systems of the embodiment of FIG. 1, and FIG. 3 is a system in the embodiment of FIG. FIG. 4 is a connection diagram between systems of a conventional digital key telephone apparatus. 1 ... master main unit, 2 ... slave main unit, 3, 4 ...
Inter-system highway, 11,21 ... Speech highway, 12,22 ... Data highway, 13,23,19,29 ... Time switch, 14,24 ... Inter-system connection interface unit, 15,25 ... Central processing Apparatus, 16, 26 ... Master side sub-processor, 17, 27 ... Slave side sub-processor, 18, 28 ... Common memory, 20, 30 ... Microprocessor.

Claims (2)

(57) [Claims] A circuit for exchanging digital voice data in a time-division communication path; a circuit for transmitting and receiving said voice data to and from a terminal; a circuit for controlling these circuits based on digital control data; One master main unit and a plurality of slave main units each having a digital interface circuit for transmitting voice data as a digital code to another main unit and receiving from the other main unit are connected via the digital interface circuit. The digital interface circuit of the master main unit transmits the control data and the audio data by addressing the slave main unit of the transmission destination, and the addressing is performed simultaneously by all the slave main units. Designation and individual designation of each slave main unit are possible. Digital interface circuit,
The master main unit receives the control data and the audio data only when all slave main units including the own unit are simultaneously specified or when the address of the own unit is individually specified, and from the slave main unit. A digital key telephone apparatus in which transmission to the master main unit is performed without specifying an address. 2. The address specification of the slave main unit has a format including a first address part for simultaneously specifying all slave main units and a second address part for individually specifying each slave main unit. 2. The digital key telephone apparatus according to claim 1, wherein the address data is transmitted by transmitting the configured address data from the master main unit to the slave main unit.