JP2973979B2 - Control information transmission method and circuit for digital multifunction telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a circuit for transmitting control information of a multifunction telephone connected to an electronic exchange via a digital communication line, and more particularly to a multifunction telephone as a main unit and the multifunction telephone. The present invention relates to an interface of an extension device having various extension functions to be connected.

[0002]

2. Description of the Related Art A digital multifunction telephone has a built-in CPU such as a microprocessor and is connected to a time-division digital communication line to perform not only ordinary voice telephone communication but also
Multi-function processing such as redial, speed dial, and facsimile communication can be performed. The extension device is connected to the multi-function telephone to further extend the function of the existing multi-function telephone.

An example of the above-mentioned multifunctional telephone is disclosed in
FIG. 4 shows an extended telephone system disclosed in JP-A-91344.

In FIG. 4, this system comprises a telephone 10 as a main unit connected to a digital communication line 50 and a plurality of extension units 20 (only one of which is shown). A communication control unit 11 that performs a call control interface with the line 50; a message processing unit 12 that manages and stores a call control message used by the call control interface of the communication control unit 11; A communication unit 13, a data requesting unit 14 for requesting attribute information (higher and lower layer characteristics, a bit rate, etc. regarding each of the extension device units 20) to each of the extension device units 20, and a request by the data requesting unit 14. The specified attribute information is managed and stored for each extended extension unit 20, and the attribute memory unit 1 subordinate to the message processing unit 12.
5 and a microprocessor 16 for controlling the above components
D / including a codec connected to the communication control unit 11
The communication control unit 11 and the extended communication unit 13 are connected by an in-channel communication path 54.

[0005] The extension device section 20 is connected to the extension communication section 13 of the telephone 10 by an extension communication path 53 and communicates with the telephone 10. The extension communication section 21 transmits and receives information data to and from the telephone 10. Unit 22 and telephone 10
An extended device attribute memory unit 23 for storing attribute information requested by the data request unit 14 of the present embodiment, and a function unit 24 for controlling the functions of the extended system.

When a user uses this system,
The extension communication unit 21 of the extension device unit 20 is connected to the extension communication unit 13 of the telephone 10 via the in-channel extension communication path 51. At this time, attribute information necessary for call control between the extension device unit 20 and the digital communication line 50 is input from the attribute memory unit 15 to the message processing unit 12, and is managed and stored as a part of the call control message.

Normally, when a control signal is transmitted from a multi-function telephone or an extension device to an electronic exchange such as a PBX via a digital communication line, as shown in FIG. Each control information is written into a predetermined time slot, for example, control information for a telephone in time slot 1 and control information for an extension device in time slot 2, and is sent to a digital communication line.

[0008]

However, in the above-mentioned system, when the multi-function telephone and the extension device try to send control information at the same time, the control information is written into both the slots 1 and 2 so that a conflict occurs in the electronic exchange. Then, for example, when the instruction of “pressing the speaker button” is issued from both the multifunction telephone and the extension device, the electronic exchange displays “pressing the speaker button”.
Signal arrives twice, so that there is a problem that it is determined to be on-hook and processed.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a control information transmission method for a digital multifunction telephone capable of preventing control information competition and a circuit therefor.

[0010]

According to the present invention, there is provided a method for transmitting control information of a digital multi-function telephone, comprising the steps of: when an extension device writes control information to a second time slot, the multi-function written to the first time slot; It is characterized in that the control information of the telephone is masked.

[0011] Preferably, there is provided an AND operation unit for inputting control information of each of the multi-function telephone and the extension device, calculating an AND of them, and writing the operation result in a first time slot. When not transmitting the control information, the functional telephone and the extension device each input “1” to the AND operation unit. When the extension device attempts to transmit the control information, it transmits “0” before transmitting the control information. Is input to the logical AND operation unit, and then the control information is written in the second time slot and transmitted at the next control information transmission timing.

The control information sending circuit of the digital multi-function telephone according to the present invention receives control information of the multi-function telephone and the extension device, performs a logical product operation of the two, and outputs the operation result to the first time. An AND operation unit to be written into the slot, and “0” to be generated and input to the AND operation unit before writing the control information of the extension device to the second time slot, and then the control information to be transferred to the second time slot. Control information writing means of the extension device to be written, control information passing means for generating and inputting "1" to the logical product operation unit when each of the multifunction telephone and the extension device does not send out control information; And control information sending means for sending the control information written in the second time slot to the electronic exchange at a predetermined timing.

[0013] Further, a logical product operation unit, a control information writing unit, a control information passing unit, and a control information sending unit may be provided in each of the multifunction telephone and the extension device.

[0014]

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

FIG. 1 is a system configuration diagram of one embodiment of the present invention, FIG. 2 is a signal format and control information format between an electronic exchange such as a PBX and a multifunctional telephone, and FIG. 3 is written in each time slot. This is a time sequence of control information to be transmitted.

In FIG. 1, a multifunctional telephone 1 according to the present embodiment is shown.
0 is a control information writing unit 1 that generates control information of the multi-function telephone 10 and writes the control information in the time slot 1 of the D channel for control information, and a clock signal that supplies a clock signal of an electronic exchange (not shown) to the extension device. A supply unit 2, a control information transmitting / receiving unit 3 for transmitting / receiving control information in synchronization with the electronic exchange,
A logical product operation unit 4 for obtaining a logical product of the control information signal of the extension device 20 and the control information signal of the multi-function telephone 10 and sending the logical product to the control information writing unit 1;
A control information writing unit 5 that generates the control information following “0” and writes it in the time slot 2 of the D channel, and a control information transmitting / receiving unit 6 that transmits and receives the control information in synchronization with the digital communication line. The control information writer 1 and the control information writer 5 each write "1" when not writing control information.

As shown in FIG. 2, the signal between the electronic exchange and the multi-function telephone is B1 for voice or digital data.
Channel, a B2 channel, and a D channel for control information in the form of data with a header. Control information of the multifunction telephone 10 is written in the time slot 1 of the D channel, and control information of the extension device 20 is written in the time slot 2 of the D channel. It is.

Next, a time sequence of control information written in each time slot will be described with reference to FIG.

During a period in which only the multifunction telephone 10 is transmitting control information, "1" is sent from the control information writing unit 5 of the extension device 20 to the logical product operation unit 4, and only the extension device 20 transmits the control information. During the transmission, the control information writing unit 1 of the multi-function telephone 10 sends “1” to the logical product operation unit 4. Then, when the logical product of the two is calculated, the control information being transmitted is directly sent to the electronic exchange.

Next, when the extension device 20 attempts to transmit control information while the multi-function telephone 10 is transmitting control information, the extension device 20 first transmits "0". By taking the logical product with this "0", the multi-function telephone 10
Is masked and does not reach the electronic exchange.

The multifunction telephone 10 transmits “1” during the control information transmission period of the extension device 20 following the transmission of “0” from the extension device 20. Then, as a result of the logical product of this “1”, the control information of the extension device 20 is sent to the electronic exchange as it is.

In this embodiment, the logical product operation unit is provided only on the multi-function telephone 10 side. However, together with the control information writing unit 1 for writing the control information of the multi-function telephone 10 in the time slot 1, each of the extension devices is provided. It may be provided.

[0023]

As described above, according to the present invention, when the extension device writes the control information in the second time slot, the control information of the multi-function telephone written in the first time slot is masked, so that the multi-function This has the effect of preventing contention between the control information of the telephone and the control information of the extension device.

An AND operation unit to which control information of each of the multi-function telephone and the extension device is input, performs an AND operation of the two, and writes the operation result in the first time slot, Control information writing means of an extension device for generating "0" before writing the control information into the second time slot, inputting the control information to the AND operation unit, and then writing the control information into the second time slot; Control information passing means for generating and inputting "1" to the logical product operation unit when each of the control information and the extension device does not transmit the control information, and transmitting the control information written in the first and second time slots to a predetermined time. By providing the control information sending means for sending the control information to the electronic exchange at the timing described above, there is an effect that the conflict of control information can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 shows a signal format and a format of control information between an electronic exchange and a multifunction telephone.

FIG. 3 is a time sequence of control information written in each time slot.

FIG. 4 is a system configuration diagram of one embodiment of a conventional multifunction telephone.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control information writing unit 2 clock signal supply unit 3 control information transmission / reception unit 4 AND operation unit 5 control information writing unit 6 control information transmission / reception unit 10 multifunction telephone 20 extension device

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04M 11/00-11/10 H04M 1/00

Claims (5)

(57) [Claims] 1. A digital multi-function telephone connected to an electronic exchange via a digital communication line and its extension equipment store respective control information in a D channel for control information of the digital communication line. 1st and 2nd
A digital multifunction telephone control information transmission method for writing and transmitting in a time slot, wherein when the extension device writes control information to the second time slot, the multifunction telephone is written to the first time slot. Control information transmission method for a digital multifunction telephone, characterized by masking control information of the digital multifunction telephone. 2. An AND operation unit for inputting control information of each of the multi-function telephone and the extension device, calculating an AND of the two, and writing a result of the operation to the first time slot, When not transmitting the control information, the functional telephone and the extension device each input “1” to the AND operation unit. When the extension device attempts to transmit the control information, the extension device transmits “1” before transmitting the control information. 2. The control information is written in the second time slot after "0" is input to the AND operation unit, and is transmitted at the next control information transmission timing.
3. The control information transmission method for a digital multifunction telephone set according to item 1. 3. A digital multi-function telephone connected to an electronic exchange via a digital communication line and its extension equipment store respective control information in a D channel for control information of the digital communication line. 1st and 2nd
In a control information transmitting circuit of a digital multifunction telephone which writes in a time slot and transmits at a predetermined timing, control information of each of the multifunction telephone and the extension device is input, and a logical AND operation of both is performed. An AND operation unit that writes an operation result to the first time slot; and “0” generated and input to the AND operation unit before writing control information of the extension device to the second time slot. And control information writing means of the extension device for writing the control information into the second time slot from the control unit. Control information passing means for generating and inputting the control information, and transmitting the control information written in the first and second time slots to the electronic exchange at a predetermined timing. Control information transmitting means for a digital multifunction telephone, comprising: 4. The control information transmitting circuit for a digital multifunction telephone according to claim 3, wherein the multifunction telephone is an ISDN terminal. 5. The multi-function telephone and the extension device are provided with the logical product operation unit, the control information writing unit, the control information passing unit, and the control information sending unit.
3. A control information sending circuit for a digital multifunction telephone according to claim 1.