JPS59178092A - Key telephone set - Google Patents

Abstract

PURPOSE:To attain miniaturization by realizing the 2nd channel used for paging or the like with hardware in small scale to constitute the device to contain a telephone set having plural channels. CONSTITUTION:The 1st channel for normal talking is provided by the number of sets corresponding to the number of telephone sets by one to one to a key telephone interface circuit 7 interfacing with key telephone sets 91-93 having >=2 channels and an exchange main body 1. On the other hand, >=1 of the 2nd channel is provided, and when a key telephone set in the interface 7 is busy or requires a short talking like paging or the like, the objective telephone set is connected by using this channel. Through the constitution above, since the 2nd channel used for paging or the like is realized by a small scale of hardware, the miniaturization is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a button telephone device, and more particularly to a button telephone interface circuit.

[Description of prior art]

Conventionally, in button telephone devices having multiple call paths for each telephone, there is a first call path used for normal calls, and a second call path for paging functions, etc. during calls. It had 2 communication paths corresponding to key telephones. Although the probability that this second communication path will be used is very low and the time that it will be used is very short,
Since the hardware has the same function as the first communication path, the equipment is very expensive, and the hardware required is about twice that required for the first communication path. there were.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks, and aims to provide a compact and inexpensive button telephone device by realizing a circuit for the second communication path with small hardware.

[Key points of the invention]

The present invention provides a key telephone interface circuit that interfaces a key telephone having two or more call paths with a switch main body, in which a number of first call channels for making a direct call are provided in a number that corresponds one-to-one to the key telephones. and further provide at least one second call path, and use said second call path when the button telephone in the interface is busy or when a specific short call is required. It has the function of connecting to a button telephone.

A feature of the present invention is that, in a button telephone device for exchanging a plurality of key telephones, the device is connected to a button telephone having two or more communication paths and interfaces between these key telephones and the exchange main body. An interface circuit is provided, the interface circuit has a call path that corresponds one-to-one to the button telephone, and at least one extra call path that is not connected to the button telephone, and further includes a call path that corresponds one-to-one to the button telephone and the extra call path that is not connected to the button telephone. and a means for connecting the telephone to the communication path of the key telephone.

[Explanation based on examples]

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

This embodiment is an embodiment of an all-digital button telephone device, and FIG. 1 is a block diagram of the entire device of this embodiment, and FIG. 2 shows a program of the button telephone interface 7 in FIG.
FIG. 3 is a diagram showing the transmission/reception timing of digital data and the frame structure.

Referring to FIG. 1, the exchange main unit (main unit) 1 includes a central processing unit 2 that controls the exchange using a storage program method, and a central processing unit 2 connected to the central processing unit 2 via a time switch memory control line 6. A time switch memory 3 for exchanging digital voice data at the clock timing shown in FIG. The digital voice data of the button telephone interface 7 is connected to and exchanged with the time switch memory 3 by a time division multiplexed data bus 5. This button telephone interface 7 has four transmitting/receiving circuits 701-70.
The three transmission/reception circuits 701 to 703 of each button telephone interface 7 connect to the button telephones 91 to 9 via input/output lines 81 to 83 for connecting the button telephones, respectively.
Connected to 3. Each of the button telephones 91 to 93 has two communication paths. The button telephones 91 to 93 and the transmitting/receiving circuits 701 to 703 are connected by three channels CHI to CH3, respectively, and each channel CHI to CH3 uses an 8-pinot l- Digital voice data having two communication paths (1/2 communication path) is transmitted and received.

That is, as shown in FIG. 3 (al), voice data on two communication paths are transmitted and received in a time-division manner, and the 8 bits of do=dv become the first communication path for normal communication, and the 8 bits of CO to C7 1 to 2 become the second communication path for paging, etc.

To explain FIG. 2, 71 is a control circuit for button telephone interface control, 701 to 704 are transmitting/receiving circuits, and each transmitting/receiving circuit 701 to 704 is
It includes shift registers 741 to 74 for converting reception speed and shift registers 751 to 754 for converting transmission speed. Also,
761 to 763 are receivers, 771 to 773 are drivers, 78 is a transmission buffer, and 79 is a reception buffer.

From the control circuit 7I controlled by the microcomputer,
The communication path switch control lines 72 (eight lines indicated by ■ to ■ in the figure) are drawn out to shift registers 741 to 744 for reception speed conversion and shift register 7 for transmission speed conversion, respectively.
It is connected to control terminals 51 to 754 (indicated by ■ to ■ in the figure). This communication path switch control line 72 is a control line that controls whether or not the communication path switch of the second communication path of each channel CHI to CH3 can be connected. (al's do-d
The connection between the first communication path corresponding to each button telephone of Co-C7 and the second communication path of Co-C7 for use in paging etc. is controlled.

Shift registers 741 to 743 for converting reception speeds are connected to receivers 761 to 763 and input lines 811 to 813 for connecting key telephones, respectively, and shift registers 75x to 753 for converting transmission speeds are connected to drivers 77i to 77, respectively.
It is connected to each of the button telephones 91 to 93 via 73 and key telephone connection output lines 821 to 823, and transmits and receives data to and from the button telephones 91 to 93. The shift registers 741 to 744 for converting reception speeds and the shift registers 751 to 754 for converting transmission speeds control the data (
This is for speed conversion between the speed shown in FIG. 3 (al format) and the data speed of the conversion time division multiplexing lotus 51 shown in FIG. 3+bl.

Transmitting/receiving circuits 701 to 703 each have channel CH1.
~CH3, and each has a first communication path and a second communication path as described above.

The transmitter/receiver circuit 704 that realizes the fourth channel has the same function as the transmitter/receiver circuits 701 to 703 of the other 3-channel channels, and the difference is that the second channel receiving path 710 and the second channel receiving path 711 Each channel via CHI~
It is connected to the second communication path of CH3. This transmitting/receiving circuit 704 receives a second call from a key telephone via any one of channels CHI to CH3 under control performed from the control circuit 71 to each transmitting/receiving circuit 701 to 704 via a control line 72. The channel data is sent to the exchange via the reception conversion shift register 744, and the second communication path data from the exchange is sent to the key telephone via the transmission speed conversion shift register 744. This shift register for reception and transmission speed conversion 744.754
The data entered into the key telephone is transferred to the key telephone as shown in Figure 3 (al.
It is sent in the format T sec at a period of T sec, and is sent to the time division multiplexing hub 5 of the exchange at the timing shown in FIG. 3(b). On the time division multiplexed bus 5, m channel 8-bit serial data are multiplexed.

By having the button telephone interface 7 control the connection of the second call path in this manner, the fourth channel can be freely connected to the other three channels, and a button telephone having multiple call paths can be connected to the exchange G. I can do it.

Although this embodiment has been described using a digital exchange (G), it can also be applied to an analog type exchange by increasing the number of connection lines between the key telephone and the interface.

〔Effect of the invention〕

As explained above, the present invention realizes the second communication path used for basing etc. with small-scale hardware,
The device is configured to accommodate a key telephone having a plurality of communication paths, thereby making the device compact and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a program of an apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of the button telephone interface 7 in FIG. 1. In FIG. 3, (a) shows the data transmission/reception format between the key telephone and the key telephone interface, and (bl shows the configuration of the time division multiplexed data bus within the exchange. 1. The main body of the exchange, 2. Central processing unit, 3...
Time switch memory, 5... time division multiplexed data 7
\S, 5'...Time division multiplexing)\S connection line, 7...
Button telephone interface, 9... Button telephone, 71... d<Tan telephone interface control circuit, 72... Control line, 73... Various timing signals and clock outside 141 to 744... Reception speed Shift register for conversion, 751-754...Shift register for transmission speed conversion, 710...Second communication channel reception lot, 71
1...Second communication channel reception lot. Patent applicant: NEC Corporation Representative Patent attorney: Naotaka Ide

Claims (1)

[Claims] (1) A plurality of button telephones, each of which has a plurality of communication paths and which selects and uses one of the communication paths, and a main device that accommodates the plurality of button telephones; The button telephone includes a plurality of first transmitting/receiving circuits corresponding to the plurality of button telephones, and the first transmitting/receiving circuit is configured to transmit and receive voice data to one of the plurality of communication paths of the button telephone. The apparatus includes at least one second transmitting/receiving circuit, and the second transmitting/receiving circuit transmits data other than the voice data to at least one of the plurality of key telephones to another communication path of the key telephone. A button telephone device configured to transmit and receive.