JP3355229B2 - Private branch exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange which connects a main unit and a digital telephone with two information channels and one control channel.

[0002]

2. Description of the Related Art In recent years, the main unit of a private branch exchange and a digital telephone have been connected by an interface composed of two information channels and one control channel, as seen in an ISDN user network interface. There are many.

[0003] The calling operation of the conventional private branch exchange will be described below with reference to the drawings. FIG. 4 shows a configuration example of a main unit of a conventional private branch exchange and a digital telephone housed therein, wherein 1 is a main unit of the private branch exchange and 2 is a digital telephone. The digital telephone 2 transmits an information channel (hereinafter, referred to as a B channel) 2 having a transmission speed of 64 kilobits per second to the main unit 1 of the private branch exchange.
And a control channel (hereinafter, referred to as a D channel) having a transmission rate of 16 kilobits per second.

In the main unit 1, reference numeral 3 denotes a main unit control unit including a microprocessor, 4 denotes a communication path connection unit for performing the B channel exchange connection processing, and 5 denotes D channel information in accordance with an instruction from the main unit control unit 3. A D-channel communication unit for transmitting to each digital telephone 2 etc. and notifying the D-channel information received from each digital telephone 2 etc. to the main unit control unit 3, and includes 6 B channels and 1 D channel. And a plurality of telephone interface units for transmitting data on the digital transmission path 7.

In the digital telephone 2, reference numeral 11 denotes a telephone control unit including a microprocessor, and reference numeral 12 denotes a B-channel information from the
And a voice communication unit 13 for transmitting the voice input from the handset 17 and the microphone 19 to the main unit 1 via the B channel, and transmits the D channel information to the main unit 1 in accordance with an instruction from the telephone control unit 11. A D-channel communication unit 14 notifies the telephone control unit 11 of the D-channel information received from the main unit 1. The D-channel communication unit 14 puts two B channels and one D channel on one digital transmission line 7 and Main device interface for transmitting to 1, 15
Reference numeral 16 denotes an operation display unit which controls operations of a dial key, a facsimile switch, a display, and the like of the digital telephone 2, and 16 denotes a data terminal interface unit for connecting a data terminal to the digital telephone 2 and performing data communication.

With respect to the operation of the conventional private branch exchange constructed as described above, the call originating operation from the digital telephone 2 will be specifically described. When the handset 17 of the digital telephone 2 is off-hook, the operation display unit 15
Notifies the telephone control unit 11 that the off-hook is detected. The telephone control unit 11 transmits information indicating off-hook to the D-channel communication unit 13 to transmit the off-hook event to the main device 1. D channel communication unit 13
Puts the information notified from the telephone control unit 11 on the D channel and transmits the information to the main device 1 via the main device interface unit 14. Data on the D channel transmitted from the digital telephone 2 is received by the D channel communication unit 5 via the telephone interface unit 6. D-channel communication unit 5 notifies main device control unit 3 of the data received from digital telephone 2. Main device control unit 3 analyzes the data notified from D-channel communication unit 5 and, when recognizing that the event is an off-hook event of digital telephone 2, starts transmission of a dial tone to digital telephone 2. First, the main device control unit 3 transmits a channel designation event to the digital telephone 2 that is the transmission source, and notifies which of the B channels is to be used. Hereinafter, the two B channels are referred to as a B1 channel and a B2 channel, respectively. Like the off-hook event, the channel designation event is transmitted using the D channel. The telephone control unit 11 of the digital telephone 2
When a channel designation event is received from the main device 1, the B channel designated by the handset 17 is connected to the communication unit 12. Further, main device control unit 3 notifies communication channel connection unit 4 of B channel connection information in order to connect the B channel used by digital telephone 2 to a dial tone transmission sound source. After that, the main device control unit 3
Shifts to a state of waiting for the reception of a dial from the digital telephone 2. The pressed dial key is detected by the operation display unit 15 of the digital telephone 2, and the telephone control unit 1
1 is notified. Similarly to the off-hook event, the telephone control unit 11 transmits the dial information to the main device 1 using the D channel. Main device controller 3 accumulates the notified dial information and, when the destination is determined, starts the calling process of the destination telephone. When the called telephone of the called party answers, the main unit control section 3 sends the B channel connection information to the communication path connecting section 4 to connect the B channel of the calling digital telephone 2 and the B channel of the called digital telephone. Notify. The above operation establishes a voice call between the two extensions.

[0007]

However, in the above-described conventional configuration, a data terminal device is connected to the data terminal interface unit 16 of the digital telephone 2 so that another B channel is used during data communication on the B channel. Can be used to communicate with the handset 17, but otherwise, there are two B
There is a problem that the channels are not used at the same time and the resources are not used effectively.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a private branch exchange which can effectively utilize two B channels.

[0009]

According to the present invention, in order to achieve the above object, another digital telephone can be connected to a digital telephone.
A telephone identifier setting unit configured to set a telephone identifier for directly identifying the first telephone connected to the main device extension or the second telephone connected to the first telephone ; The telephone identifier of the telephone identifier setting unit
Via the main unit interface together with the control event
Transmitted to the main unit and received from the main unit.
The telephone identifier assigned to the telephone
The data received when it matches the telephone identifier of
An information channel communication unit that notifies the telephone control unit,
The main unit includes a plurality of information channels and one control channel.
On a single digital transmission line
A plurality of telephone interface units for transmitting to the
Channel used for each telephone identifier of digital telephone
Control from the digital telephone
When the phone identifier is received with the event,
Requests the vacant information channel to the
The digital telephone notified by the channel management unit
The available information channel to the digital telephone
And a main device control unit for notifying the user .

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention, by the configuration described above, by connecting two digital telephone to a single extension interfaces, end
Attached to the event information from the digital telephone at the end.
Channel to be assigned according to the
By allocating different B channels after the determination , the two B channels can be used effectively.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration example of a main unit of a private branch exchange and a digital telephone housed therein in an embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a main unit of the private branch exchange, and reference numeral 22 denotes a digital telephone. The digital telephone 22 is connected to the main unit 21 by two B channels having a transmission rate of 64 kbits / sec and one D channel having a transmission rate of 16 kbits / sec.

In the main unit 21, reference numeral 23 includes a microprocessor, and a main unit control unit for controlling call control between the extension and the inside / outside line. Reference numeral 24 denotes a communication path connection unit for connecting the extension and the inside / outside line via the B channel. Reference numeral 25 denotes a D which transmits D channel information to each digital telephone 22 or the like in accordance with an instruction from the main device control unit 23 and notifies the main device control unit 23 of the D channel information received from each digital telephone 22 or the like.
A channel communication unit, 26 is a plurality of telephone interface units for transmitting two B channels and one D channel on one digital transmission line 27, and 28 is a channel management unit for managing channels used for each digital telephone. is there.

In the digital telephone 22, reference numeral 31 includes a microprocessor, and a telephone control unit for controlling the operation of the telephone. Reference numeral 32 converts a voice input from the handset 39 or the microphone 41 into a digital signal and puts it on the B channel to cause the main unit to operate. 21 and B from the main unit 21
A communication unit 33 that returns the contents of the channel to voice and sends it out to the handset 39 or the speaker 40 transmits a D-channel information to the main unit 21 in accordance with an instruction from the telephone control unit 31, and transmits the D-channel information received from the main unit 21. A D-channel communication unit that notifies the telephone control unit 31 of channel information;
Reference numeral 4 denotes a main unit interface unit for transmitting two B channels and one D channel on one digital transmission line 27 and transmitting them to the main unit 21. Reference numeral 35 denotes an operation of a dial key, a hook switch, a display and the like of a digital telephone. , A data terminal interface unit for connecting a data terminal to the digital telephone 22 and performing data communication, and 37 a digital telephone 22 as shown in FIG. A telephone interface unit for connecting two information channels and one control channel on one digital transmission line 43 and transmitting the information channel to a second telephone 42. Telephone interface unit 26
Is the first phone connected directly to
A telephone identifier setting unit for setting information (hereinafter, referred to as a telephone identifier) for identifying whether the telephone is the second telephone 42 connected to the second telephone 22.

FIG. 2 is a diagram showing the configuration when another digital telephone 42 is connected to the digital telephone 22 in the above embodiment. In FIG. 2, reference numeral 22 denotes a first digital telephone (hereinafter, referred to as a master telephone) directly connected to the extension of the main device 21;
This is a second digital telephone (hereinafter, referred to as a slave telephone) having the same configuration as the first digital telephone 22. The main device interface unit 34 of the second digital telephone 42 includes the first telephone interface unit 3
7, a telephone identifier indicating the master telephone is set in the telephone identifier setting unit 38 of the digital telephone 22, and a telephone identifier indicating the slave telephone is set in the telephone identifier setting unit 38 of the digital telephone 42. You.

FIG. 3 shows a channel management table of the channel management unit 28 in the main unit 21. FIG.
In the telephone interface item 51, information for identifying the extension of the main device 21 is set, and in the telephone identifier item 52, information stored in the telephone identifier setting unit 38 (identifying the master telephone or the slave telephone). Information) is set, and information indicating the B channel use status for each telephone is set in the items 53 and 54. If the telephone is in use, a telephone interface to which the partner telephone is connected and a telephone identifier are set.

The operation of the private branch exchange according to the present embodiment configured as described above will be described specifically with reference to FIG. When the handset 39 of the digital telephone 22 is off-hook, the operation display unit 35 notifies the telephone control unit 31 that the off-hook is detected. Telephone control unit 31
Transmits information indicating an off-hook to the D-channel communication unit 33 in order to transmit the off-hook event to the main device 21. At this time, the telephone control unit 31 reads the telephone identifier (the master telephone in this case) of the digital telephone 22 from the telephone identifier setting unit 38, and transmits the off-hook event with the telephone identifier. The D channel communication unit 33 puts the information notified from the telephone control unit 31 on the D channel and transmits the information to the main device 21 via the main device interface unit 34. Data on the D channel transmitted from the digital telephone 22 is received by the D channel communication unit 25 via the telephone interface unit 26. D channel communication section 25 notifies main apparatus control section 23 of the data received from digital telephone 22. Main device control unit 23 analyzes the data notified from D-channel communication unit 25 and, when recognizing that the event is an off-hook event of digital telephone 22 (master telephone), transmits a dial tone to digital telephone 22. Start as follows: First, the main device control unit 23 requests the channel management unit 28 to allocate a free B channel of the telephone interface unit 26. The channel management unit 28 notifies the main unit control unit 23 of the requested free B channel (either the B1 channel or the B2 channel) of the telephone interface. Main device control unit 23 transmits a channel designation event to digital telephone 22 (master telephone), which is the transmission source, and notifies which B channel is to be used. Like the off-hook event, the channel designation event is transmitted using the D channel. At this time, the main device control unit 23
Sends the channel designation event with the telephone identifier (master telephone) of the digital telephone 22. When the telephone identifier assigned to the received event matches the telephone identifier of the telephone, the D-channel communication unit 33 of the digital telephone 22 notifies the telephone controller 31 of the received data. Conversely, if the telephone identifiers do not match, the event is discarded. When receiving the channel designation event from main device 21, telephone control unit 31 connects handset 39 to the designated B channel to call unit 32. Further, main device control unit 23 notifies communication channel connection unit 24 of the B channel connection information in order to connect the B channel used by digital telephone 22 to the dial tone transmission sound source. Thereafter, main device control unit 23 shifts to a state of waiting for dial reception from digital telephone 22. The pressed dial key is detected by the operation display unit 35 of the digital telephone 22 and is notified to the telephone control unit 31. As in the case of the off-hook event, the telephone control unit 31 adds a telephone identifier (master telephone) to the dial information, and transmits the dial information to the main device 21 using the D channel. Main device controller 23 accumulates the notified dial information, and when the destination is determined, starts the calling process of the called telephone. When the called telephone of the called party answers, the main unit control unit 23 transmits the B channel connection information to the communication path connecting unit 24 in order to connect the B channel of the calling digital telephone 22 and the B channel of the called digital telephone. Notify.

Next, the operation of making a call from the digital telephone 42 while the digital telephone 22 is talking will be described in detail with reference to FIGS. Digital telephone 4
When the second handset 39 is off-hook, the operation display unit 35 notifies the telephone control unit 31 that the off-hook is detected. The telephone control unit 31 transmits information indicating off-hook to the D-channel communication unit 33 in order to transmit the off-hook event to the main device 21. At this time, the telephone control unit 31 reads the telephone identifier (slave telephone) of the digital telephone 42 from the telephone identifier setting unit 38, and transmits the off-hook event with the telephone identifier. The D channel communication unit 33 puts the information notified from the telephone control unit 31 on the D channel and transmits the information to the main device 21 via the main device interface unit 34 and the digital telephone 22 (master telephone). The data on the D channel transmitted from the digital telephone 42 is received by the D channel communication unit 25 via the telephone interface unit 26 of the main device 21. D channel communication unit 25
Notifies the main unit control unit 23 of the data received from the digital telephone 42. Main device control unit 23 analyzes the data notified from D-channel communication unit 25 and, when recognizing that the event is an off-hook event of digital telephone 42 (slave telephone), transmits a dial tone to digital telephone 42. Start as follows: First, the main device control unit 23 requests the channel management unit 28 to allocate a free B channel of the telephone interface unit 26. The channel management unit 28 notifies the main unit control unit 23 of a free B channel not used by the digital telephone 22 of the requested telephone interface. Main device control unit 23 transmits a channel designation event to digital telephone 42 (slave telephone), which is the transmission source, and notifies which B channel is to be used. Like the off-hook event, the channel designation event is transmitted using the D channel. At this time,
The main device control unit 23 adds the telephone identifier (slave telephone) of the digital telephone 42 to the channel designation event and transmits the event. When the telephone identifier assigned to the received event matches the telephone identifier of the telephone, the D channel communication unit 33 of the digital telephone 42 notifies the telephone control unit 31 of the received data. Conversely, if the telephone identifiers do not match, the event is discarded. Upon receiving the channel designation event from the main device 21, the telephone control unit 31 of the digital telephone 42 connects the handset 39 to the designated B channel to the communication unit 32. Further, main device control unit 23 notifies communication channel connection unit 24 of B channel connection information in order to connect the B channel used by digital telephone 42 to the dial tone transmission sound source. Thereafter, main device control unit 23 shifts to a state of waiting for dial reception from digital telephone 42. The pressed dial key is a digital telephone 4
2 is detected by the operation display unit 35 and the telephone control unit 31
Will be notified. As in the case of the off-hook event, the telephone control unit 31 adds a telephone identifier (slave telephone) to the dial information and transmits the dial information to the main unit 21 via the digital telephone 22 (master telephone) using the D channel. Main device controller 23 accumulates the notified dial information and, when the destination is determined, starts the calling process of the called telephone. When the called telephone of the called party answers, the main device control unit 23 transmits the B channel connection information to the communication path connecting unit 24 in order to connect the B channel of the calling digital telephone 42 and the B channel of the called digital telephone. Notify. The above operation establishes a voice call between the two extensions.

[0018]

As described above, according to the present invention, a master telephone and a slave telephone are individually assigned by assigning a telephone identifier to a call control event exchanged between the main unit of the private branch exchange and the digital telephone. It is possible to control the two channels connected to one extension interface at the same time by managing the B channel used for each telephone identifier.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a private branch exchange according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration when two digital telephones are connected according to an embodiment of the present invention;

FIG. 3 is a schematic diagram showing a channel management table in a channel management unit according to one embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a conventional private branch exchange.

[Explanation of symbols]

 Reference Signs List 21 main unit of private branch exchange 22 digital telephone (master telephone) 23 main unit control unit 24 communication path connection unit 25 D channel communication unit in main unit 26 telephone interface unit 27 digital transmission line 28 channel management unit 31 telephone control unit 32 Talk unit 33 D-channel communication unit in telephone set 34 Main device interface unit 35 Operation display unit 36 Data terminal interface unit 37 Telephone interface unit in telephone set 38 Telephone identifier setting unit 39 Handset 40 Speaker 41 Microphone 42 Digital telephone (slave telephone) 43 Digital transmission path

Continuation of the front page (56) References JP-A-3-104493 (JP, A) JP-A-4-178059 (JP, A) JP-A-4-207294 (JP, A) JP-A-64-82794 (JP) JP-A-6-197197 (JP, A) JP-A-4-369994 (JP, A) JP-A-1-209899 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H04Q 3/58 101 H04M 3/00 H04M 11/00 303

Claims (2)

(57) [Claims] 1. A private automatic branch exchange accommodating a plurality of digital phones connected by a plurality of information channels and one control channel to the main unit, the digital telephone, Tsukasa Ru phone control unit the operation of the telephone A main unit interface for transmitting a plurality of information channels and one control channel to a main unit via one digital transmission line; and mounting a plurality of information channels and one control channel on one digital transmission line. A telephone interface unit for transmitting the digital telephone to the second telephone, and the digital telephone is the first telephone directly connected to the extension of the main unit or the second telephone connected to the first telephone. Telephone for identifying whether it is a telephone
And the telephone identifier setting unit for setting an identifier, control event phone identifier of the telephone identifier setting unit
And the main unit via the main device interface unit.
Transmitted to the main unit and attached to the event received from the main unit.
The telephone identifier set in the telephone identification setting unit is
The received data when it matches the
And an information channel communication unit to notify said main device, a plurality of telephone interface for transmitting the digital telephone put a plurality of information channels and one control channel to a single digital transmission path, said digital telephone set A channel management unit for managing a channel used for each telephone identifier, and a telephone identifier together with a control event from the digital telephone.
Receiving the free information channel to the channel management unit.
Request for channel assignment, notified by the channel management unit.
Available information channels available to the digital telephone
And a main unit control unit for notifying the digital telephone of this . 2. The main unit has two information channels and one control.
Accommodates multiple digital telephones connected by channels
An automatic private branch exchange, The digital telephone is Telephone system including a microprocessor that controls the operation of the telephone
Obe and Two information channels and one control channel are combined into one
Main unit interface for transmission to the main unit on digital transmission lines
-Face part, Two information channels and one control channel are combined into one
Telephone that transmits to the second telephone on digital transmission path
Machine interface section, The digital telephone is connected directly to the extension of the main unit
First phone or connected to first phone
Phone to identify if it is the second phone to be used
A telephone identifier setting unit for setting an identifier, Control the telephone identifier of the telephone identifier setting unit.
And the main unit via the main device interface unit.
Transmitted to the main unit and attached to the event received from the main unit.
The telephone identifier set in the telephone identification setting unit is
The received data when it matches the
An information channel communication unit for notifying the main device
But, Microprocessor for call control between extensions and between extensions
A main device control unit including a Two information channels and one control channel are combined into one
Digital telephone set on a digital transmission path
A number of telephone interface units, Channel used for each telephone identifier of the digital telephone
A channel management unit for managing the channel, From a digital telephone, a telephone
Upon receiving a separate part, the main unit control unit performs the channel management.
Requesting the vacant information channel to be allocated to the
The channel management unit recognizes the telephone of the originating digital telephone.
Pass the available information channel available to the other party to the main unit controller.
And the main unit control section transmits the digital telephone
To inform the machine which information channel to use
Characterized by transmitting the channel designation event of
Automatic exchange inside.