JPH0750859A - Automatic private branch exchange - Google Patents

Abstract

PURPOSE:To utilize simultaneously and independently two telephone sets by connecting a telephone set to another telephone set connecting to a private branch of automatic exchange master set through two B-channels and one D-channel. CONSTITUTION:A channel management section 28 is provide in a master set 21 of an automatic private branch exchange and a digital telephone set 21 provided with a telephone set interface section 37 and a telephone set identifier setting section 38. A telephone set 22 being a master set is connected to a telephone set interface of the master set 21 and a telephone set being a slave of the same configuration is connected to the telephone set interface section 37 of the telephone set 22 and an identifier representing the master or the slave is provided to a telephone set identifier setting section 38 of each telephone set to transmit it to the master set 21. Thus, two B-channels are respectively allocated to two B-channels by a channel management section 28 to attain simultaneous talking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private automatic branch exchange for connecting 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, a main unit of a private branch exchange and a digital telephone are connected by an interface composed of two information channels and one control channel as seen in an ISDN user network interface. There are many.

A call originating operation of a conventional private automatic branch exchange will be described below with reference to the drawings. FIG. 4 shows an example of the configuration of a main unit of a conventional private automatic exchange and a digital telephone housed therein. Reference numeral 1 is a main device of the private automatic exchange and 2 is a digital telephone. The digital telephone 2 has an information channel (hereinafter referred to as B channel) 2 having a transmission rate of 64 kilobits per second in the main unit 1 of the private branch exchange.
It is connected to a book by one control channel (hereinafter referred to as D channel) having a transmission rate of 16 kilobits per second.

In the main unit 1, 3 is a main unit control unit including a microprocessor, 4 is a communication path connection unit for performing the above-mentioned B channel switching connection processing, and 5 is D channel information according to an instruction from the main unit control unit 3. A D channel communication unit for transmitting to each digital telephone 2 etc. and notifying D channel information received from each digital telephone 2 etc. to the main device control unit 3, 6 is one for each of two B channels and one D channel Is a plurality of telephone interface units that are placed on the digital transmission line 7 of FIG.

In the digital telephone 2, 11 is a telephone control unit including a microprocessor, 12 is B channel information from the main unit 1, a handset 17 and a speaker 18.
And the voice input from the handset 17 or the microphone 19 on the B channel and transmitted to the main unit 1, and 13 transmits the D channel information to the main unit 1 according to an instruction from the telephone control unit 11. At the same time, the D channel communication section for notifying the telephone channel control section 11 of the D channel information received from the main apparatus 1, 14 is a main apparatus by putting two B channels and one D channel on one digital transmission line 7. Main device interface section for transmitting to 1
Is an operation display unit that controls the operation of the dial keys, the fax switch, the display, etc. of the digital telephone 2, and 16 is a data terminal interface unit for connecting a data terminal to the digital telephone 2 for data communication.

With respect to the operation of the conventional private automatic branch exchange configured as described above, the operation of making a call 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 off-hook has been detected. The telephone control unit 11 transmits information indicating off-hook to the D-channel communication unit 13 in order to transmit the off-hook event to the main device 1. D channel communication unit 13
Sends the information notified from the telephone control unit 11 to the main device 1 via the main device interface unit 14 on the D channel. The 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. The D-channel communication unit 5 notifies the main device control unit 3 of the data received from the digital telephone 2. The main device control unit 3 analyzes the data notified from the D channel communication unit 5, and when it recognizes that it is an off-hook event of the digital telephone 2, it starts a dial tone transmission process to the digital telephone 2. First, the main device control section 3 transmits a channel designation event to the originating digital telephone 2 to notify which B channel is used. Hereinafter, the two B channels are referred to as B1 channel and B2 channel, respectively. Like the off-hook event above, the channeling event is delivered using the D channel. The telephone control unit 11 of the digital telephone 2
When the channel designation event from the main device 1 is received, the B channel designated by the handset 17 is connected to the communication unit 12. Further, the main device control unit 3 notifies the channel connection unit 4 of the B channel connection information in order to connect the B channel used by the digital telephone 2 to the dial tone transmission sound source. After that, the main device control unit 3
Shifts to a state of waiting for dial reception 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 will be notified. Similar to the off-hook event, the telephone control unit 11 transmits dial information to the main device 1 using the D channel. The main device control unit 3 stores the notified dial information, and when the destination is determined, starts the calling process of the destination telephone. When the called party's partner telephone responds, the main device control section 3 connects the call channel connection section 4 with the B channel connection information in order to connect the B channel of the calling party's digital telephone 2 to the called party's digital telephone. To notify. The above operation establishes a voice call between two extensions.

[0007]

However, in the above-mentioned conventional configuration, the data terminal device is connected to the data terminal interface section 16 of the digital telephone 2 to connect another B channel during data communication on the B channel. Although the user can use the handset 17 to make a call, except for the other cases, there are two through the digital telephone 2B
There is a problem that resources are not used effectively because channels are not used at the same time.

The present invention solves such a conventional problem, and an object of the present invention is to provide a private automatic branch exchange capable of effectively utilizing two B channels.

[0009]

According to the present invention, in order to achieve the above object, a digital telephone can be connected to another digital telephone, and each telephone is
A telephone identifier setting unit for setting information for identifying whether the telephone is the first telephone directly connected to the extension of the main device or the second telephone connected to the first telephone, In the main device, a channel management unit for managing the B channel to be used is provided for each extension telephone identifier.

[0010]

According to the present invention, two digital telephones are connected to one extension interface by the above-mentioned structure,
2 by assigning different B channels
The B channel of the book can be effectively used.

[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 one embodiment of the present invention. In FIG. 1, reference numeral 21 is a main unit of a private automatic branch exchange, and 22 is a digital telephone. The digital telephone 22 is connected to the main unit 21 by two B channels having a transmission rate of 64 kilobits per second and one D channel having a transmission rate of 16 kilobits per second.

In the main unit 21, 23 is a main unit control unit which includes a microprocessor and controls call control between internal lines and external lines, and 24 is a communication path connection unit which connects internal lines and external lines with B channel. Reference numeral 25 is a D that 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, a plurality of telephone interface units for transmitting two B channels and one D channel on one digital transmission path 27, and a channel management unit for managing a channel used for each digital telephone. is there.

In the digital telephone 22, reference numeral 31 includes a microprocessor, a telephone control section for controlling the operation of the telephone, and 32 a voice input from the handset 39 or the microphone 41 to be converted into a digital signal and placed on the B channel to be the main unit. 21 from the main device 21
The communication unit 33, which returns the contents of the channel to voice and sends it to the handset 39 or the speaker 40, 33 transmits the information of the D channel to the main device 21 according to the instruction from the telephone control unit 31, and the D received from the main device 21. D channel communication unit for notifying the telephone control unit 31 of channel information, 3
Reference numeral 4 is a main device interface section for transmitting two B channels and one D channel on one digital transmission path 27 and transmitting them to the main device 21, and 35 is an operation of a dial key, a hook switch and a display of a digital telephone. 2 is a data terminal interface section for connecting a data terminal to the digital telephone 22 to perform data communication, and 37 is a digital telephone 22, and as shown in FIG. A telephone interface unit for connecting 42 and transmitting two information channels and one control channel on one digital transmission path 43 to the second telephone 42, and 38 is the telephone of the main unit 21. Telephone interface unit 26
Is the first phone connected directly to the
A telephone identifier setting unit that sets information (hereinafter, referred to as a telephone identifier) for identifying whether the second telephone 42 is connected to the second telephone 22.

FIG. 2 is a block diagram of the digital telephone 22 in the above embodiment when another digital telephone 42 is connected. In FIG. 2, reference numeral 22 is a first digital telephone (hereinafter referred to as a master telephone) directly connected to the extension of the main unit 21, and 42 is 1
It is a second digital telephone having the same configuration as the first digital telephone 22 (hereinafter referred to as a slave telephone). The main device interface section 34 of the second digital telephone 42 is the first telephone interface section 3
7, the telephone identifier setting unit 38 of the digital telephone 22 is set with a telephone identifier indicating a master telephone, and the telephone identifier setting unit 38 of the digital telephone 42 is set with a telephone identifier indicating a slave telephone. It

FIG. 3 shows a channel management table included in the channel management unit 28 in the main unit 21. Figure 3
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 section 38 (identifying the master telephone or the slave telephone) is set. 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, the telephone interface and telephone identifier to which the other telephone is connected are set.

With respect to the operation of the private branch exchange in the present embodiment configured as described above, the operation of making a call from the digital telephone 22 will be specifically described 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 has been detected. Telephone control unit 31
Sends 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 of the digital telephone 22 (in this case, the master telephone) from the telephone identifier setting unit 38, assigns the telephone identifier to the off-hook event, and transmits the off-hook event. 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. The 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. The D-channel communication unit 25 notifies the main device control unit 23 of the data received from the digital telephone 22. When the main device control unit 23 analyzes the data notified from the D channel communication unit 25 and recognizes that it is an off-hook event of the digital telephone 22 (master telephone), it sends a dial tone to the digital telephone 22. Start with: First, the main device control unit 23 requests the channel management unit 28 to allocate an empty B channel of the telephone interface unit 26. The channel management unit 28 notifies the main device control unit 23 of the empty B channel (either the B1 channel or the B2 channel) of the requested telephone interface. The main device control unit 23 sends a channel designation event to the originating digital telephone 22 (master telephone) to notify which B channel is used. Like the off-hook event above, the channeling event is delivered using the D channel. At this time, the main device control unit 23
Sends the channel designation event with the telephone identifier of the digital telephone 22 (master telephone). The D channel communication unit 33 of the digital telephone 22 notifies the telephone control unit 31 of the received data when the telephone identifier given to the received event matches the telephone identifier of the telephone. Conversely, if the phone identifiers do not match, the event is discarded. Upon receiving the channel designation event from the main device 21, the telephone control unit 31 connects the handset 39 to the designated B channel with respect to the communication unit 32. Further, the main device control unit 23 notifies the channel connection unit 24 of the B channel connection information in order to connect the B channel used by the digital telephone 22 to the dial tone transmission sound source. After that, the main device control section 23 shifts to a waiting state for dial reception from the digital telephone 22. The pressed dial key is detected by the operation display unit 35 of the digital telephone 22 and notified to the telephone control unit 31. Similarly to the above-mentioned off-hook event, the telephone control unit 31 adds a telephone identifier (master telephone) to the dial information and transmits it to the main device 21 using the D channel. The main device control unit 23 stores the notified dial information, and when the destination is confirmed, starts the calling process of the receiving party telephone. When the called telephone of the called party responds, the main device control section 23 informs the call path connecting section 24 of the B channel connection information in order to connect the B channel of the called digital telephone 22 to the called digital telephone. To notify.

Next, with reference to FIG. 2 and FIG. 1, the transmission operation from the digital telephone 42 during the call of the digital telephone 22 will be specifically described. Digital telephone 4
When the second handset 39 is off-hooked, the operation display unit 35 notifies the telephone control unit 31 that the off-hook has been 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, attaches the telephone identifier to the off-hook event, and transmits it. The D channel communication unit 33 puts the information notified from the telephone control unit 31 on the D channel and transmits it 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 device control unit 23 of the data received from the digital telephone 42. When the main device control unit 23 analyzes the data notified from the D channel communication unit 25 and recognizes that it is an off-hook event of the digital telephone 42 (slave telephone), it sends a dial tone to the digital telephone 42. Start with: First, the main device control unit 23 requests the channel management unit 28 to allocate an empty B channel of the telephone interface unit 26. The channel management unit 28 notifies the main device control unit 23 of an empty B channel that is not used by the digital telephone 22 of the requested telephone interface. The main device control unit 23 transmits a channel designation event to the originating digital telephone 42 (slave telephone) to notify which B channel is used. Like the off-hook event above, the channeling event is delivered 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 it. The D-channel communication unit 33 of the digital telephone 42 notifies the telephone control unit 31 of the received data when the telephone identifier given to the received event matches the telephone identifier of the telephone. Conversely, if the phone 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 call unit 32. Further, the main device control unit 23 notifies the channel connection unit 24 of the B channel connection information in order to connect the B channel used by the digital telephone 42 to the dial tone transmission sound source. After that, the main device control section 23 shifts to a waiting state for dial reception from the digital telephone 42. The dial key pressed is the digital telephone 4
2 is detected by the operation display unit 35 and the telephone control unit 31
Will be notified. Similar to the above-mentioned off-hook event, the telephone control unit 31 adds a telephone identifier (slave telephone) to the dial information and transmits it to the main unit 21 via the digital telephone 22 (master telephone) using the D channel. The main device control unit 23 stores the notified dial information, and when the destination is confirmed, starts the calling process of the receiving party telephone. When the called telephone of the called party responds, the main device control section 23 informs the call path connecting section 24 of the connection information of the B channel in order to connect the B channel of the called digital telephone 42 to the called digital telephone. To notify. The above operation establishes a voice call between two extensions.

[0018]

As described above, according to the present invention, a master telephone and a slave telephone are individually provided by assigning a telephone call identifier to a call control event exchanged between a main unit of a private automatic branch exchange and a digital telephone. By controlling the B channel used for each telephone identifier, it becomes possible to use two telephones connected to one extension interface at the same time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a private automatic 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 in an embodiment of the present invention.

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

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

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A private automatic branch exchange for accommodating a plurality of digital telephones connected to a main unit by two information channels and one control channel, wherein the digital telephones include a microprocessor that controls the operation of the telephones. A control unit, a main unit interface unit for transmitting two information channels and one control channel on one digital transmission line and transmitting them to the main unit, and a data terminal connected to a digital telephone for data communication. A data terminal interface unit, a telephone interface unit for transmitting two information channels and one control channel on one digital transmission line to transmit to a second telephone, and a telephone connected to the main device is directly connected to an extension line. Is the first phone that is connected or is the second phone that is connected to the first phone A telephone identifier setting unit for setting information for identifying whether or not the main device has a main device control unit including a microprocessor for controlling call control between internal lines and external lines; and two information channels. A private automatic branch exchange comprising a plurality of telephone interface units for transmitting one control channel on one digital transmission path and transmitting the digital telephone to a digital telephone, and a channel management unit for managing a channel used for each telephone identifier of the digital telephone.