JPH0365846A - Communication method in integrated service digital network and its communication terminal equipment - Google Patents

Abstract

PURPOSE:To allow a terminal equipment to view the communication by setting a communication line with an opposite subscriber and selecting the broadcast mode for terminal equipments in the communication standby state other than a busy terminal equipment. CONSTITUTION:When a broadcast mode setting key of a communication terminal equipment in the communication standby state is depressed, since a 1st switch means 16 disconnects a layer 1 control section 11 and a layer 2/3 control section 12, the transmission/reception of a D-channel signal is disabled. Moreover, a 2nd switch means 17 and a 3rd switch means 18 are opened and a keyboard output and a microphone output are not sent to a B-channel. Thus, no hindrance is given to the operation of a busy communication terminal equipment 10 and the layer 1 control section 11 is active to the information of B-channel on the bus line, then the information of B-channel is received by all standby communication terminal equipments 10. Thus, even the standby communication terminal equipments connected to the same bus line view the information transferred to the bus line.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication terminal device that provides communication services by connecting to a user/network interface of a basic interface of an integrated service digital network (hereinafter referred to as 15DN and IU). It is.

[Conventional technology]

The user/network interface of the basic interface of l5DN consists of two information channels (hereinafter referred to as B channels) and one signal channel (hereinafter referred to as D channel). Connect up to 8 communication terminal devices on the bus wiring of
It was possible to communicate on two lines at the same time using two communication terminal devices.

[Problem to be solved by the invention]

However, although up to eight communication terminal devices can be connected to the user/network interface bus wiring as described above, only two communication terminal devices can communicate, and the other six are in a communication standby state. There was a problem that it became unusable. Since the user/network interface of the basic interface is of the bus wiring type, information sent from the network is sent to the communication terminal equipment that can be seen, heard, and transmitted by all communication terminal equipment, and is transmitted to the communication terminal equipment on the bus wiring. Provides a communication method and communication terminal device that allows information transferred on the bus wiring to be viewed even by a communication terminal device connected to the same bus wiring and waiting for communication by providing a function that allows information to be received in broadcast mode. The purpose is to provide.

[Means to solve the problem]

In order to solve the above problems, the present invention sets up a communication line between I5DN subscribers via an I5DN using one of a plurality of communication terminal devices each connected to a bus wiring. When a communication terminal device other than the communication terminal device performing the communication is in a communication standby state, the function of the device is set to broadcast mode, thereby prohibiting the transmission and reception of signals via multiple signal channels. At the same time, in order to prevent information from escaping to the information channel and to receive only information input via the information channel in broadcast mode, the terminal device is equipped with a broadcast mode setting key and the l
A first switch means for opening and closing the connection between the layer 1 control unit and the layer control unit of the 5DN protocol, and the input of information controlled by the layer 2/3 control unit and input/output via the information channel. information channel switching means for switching the power circuit, second and third switch means for opening and closing the information output from the means, and a layer 2/3 control unit that is activated by pressing the broadcast mode setting key and is in a communication standby state. and broadcast mode control means for opening the first, second, and third switch means after detecting that the broadcast mode is present.

[Effect]

According to the present invention, since the communication terminal device is configured as described above, when the broadcast mode setting key of the communication terminal device in the communication standby state is pressed, the first switch means is activated.
Since the control section and layer 3 control section are separated, it is no longer possible to transmit and receive D channel signals. Further, the second switch means and the third switch means are opened, and the keyboard output and microphone output are not sent to the B channel. Therefore, it does not interfere with the operation of the communication terminal device during communication,
Since the layer 1 control unit is activated for the B channel information on the bus wiring, the B channel information can be received by all the communication terminal devices on standby.

〔Example〕

FIG. 1 is an explanatory diagram of an embodiment of the communication method of the present invention.

In Figure 1, 1 is subscriber A, 2 is subscriber B, 3 is integrated service digital network (l5DN), and 4 is subscriber B.
bus wiring on the side, TEJa is the communication terminal equipment on the subscriber A side (
(hereinafter referred to as terminal device), TE2a, TE2b...
- TE2g t TE2h is the terminal device of subscriber B and is connected to the bus wiring 4, and TE2b-TV and TE2h are set to broadcast mode. It is assumed that subscriber A1 and subscriber B2 communicate by setting up a line via 15DN3 using terminal devices TEJa and TF, 2a, respectively.

By the way, TE? b-TE2h can also operate as a normal terminal device, and either can be used to perform this communication with TEJa individually.

When communicating in broadcast mode, a communication line is established between the terminal devices TEla and TE2a according to the normal user/network interface protocol control procedure as described above, and communication is enabled. By pressing the broadcast mode setting key of the terminal device TE, 2b-TE2h, which is in a communication standby state, the terminal device Tl1 of the subscriber A1
Since the information transmitted from ja flows on the bus wire 4 of subscriber B2 via tsDN3, all terminal devices T
Reception is also possible in E2b-TE2h. In addition,
Since a full-duplex communication line has been established between the terminal device TEJa and TE2 a, transmission from TE2 a is also
? b - Can be received by TE2h.

FIG. 2 is a configuration diagram of an embodiment of the communication terminal device of the present invention. 2, 4 is a bus wiring, 10 is a communication terminal device, 11 is a layer 1 control section, 12 is a layer 2/3 control section, 13 is an operation control section, 14 is an operation section, 14a is a dial, 14b is a broadcast mode setting key; 15 is a broadcast mode control means; 16 is a first switch means; 17 is a second switch means; 18 is a third switch means; 19 is an information channel switching means; 20 is a data input/output unit; Input/output section, 2
2 is a keyboard, 23 is a display, 24 is a microphone, and 25 is a speaker.

To perform bidirectional communication via the 15DN, for example, if the sending side is subscriber A1 in FIG. When synchronization is established, the layer 2/3 control unit 12 is notified that layer 1 has become active.

The layer 2/3 control unit 12 converts the dial information etc. accumulated at the time into a call setup signal according to the protocol conditions defined by the user/network interface, and this signal is sent to the network via the layer 1 control unit 11. The signal is sent to the

When the network receives the signal from the terminal, it sends a call setup signal x'J[, to the terminal equipment of the other subscriber B2 (TE, ?a in Figure 1), and the other terminal equipment sends a response signal to the network. When you return it,
The network sets up a communication line (B channel) between terminals,
A signal indicating that communication is possible is sent to both terminal devices.

From this communication state, a transmission and reception communication line is established between the terminals, and full-duplex communication becomes possible between TEJa and TE2a.

In this state, the first switch means 16, the second switch means 17 and the third switch means of each terminal device of TEla and TE2a are switched.
Each circuit of the switch means 18 is in a conductive state, each communication line of the B channel and the D channel is in an established state, and the information of the B channel is inputted and outputted to each input/output section through the information channel switching means 19. Ru.

Next, when performing broadcast mode communication, from the terminal device TE2b of subscriber B2 to TE, ? After the communication line between TEJa and TEza is established in each communication terminal h, the broadcast mode setting key 14b of the operation unit 14 is pressed. When the broadcast mode control means 15 detects a signal from the broadcast mode setting key 14b, the broadcast mode control means 15 detects a signal sent from the layer 2/3 control section 12 indicating that it is in a communication standby state, thereby controlling the layer 1 control section 11. Activates B, detects a synchronization pulse from information on the bus wiring, establishes synchronization, and
Enable channel reception.

Subsequently, the broadcast mode control means 15 opens the first switch means 16, the second switch means 17, and the third switch means 18, thereby switching on the B channel transmission side circuit for transmitting information from the terminal device to the network. Leave it open. moreover,
By opening the signal line of the pD channel by the first switch means 16, the signal transmission/reception operation is stopped.

Therefore TE,? In TE2h from b to TE2h, output devices such as the display 23 and the speaker 25 can output information sent from TEla, but the signals from the keyboard 22 of the data input/output unit 20 and the microphone 24 of the audio input/output unit 21 Since ? is not output, the information on the upper side (terminal → network) on the bus wiring is sent by TE, ? Only a is possible, and does not interfere with TEza's information transmission.

To cancel broadcast mode, press broadcast mode setting key 1.
By pressing 4b again, broadcast mode control means 1
5 detects this signal, and the first to third switch means 1
6.17.18 are closed and conductive, the layer 1 control unit 11 is made inactive, and the terminal device is returned to the communication standby state.

In this state, even if the button is pressed from TE2b to TE2h, normal two-way communication is possible if the dial is pressed and a call operation is performed.

〔Effect of the invention〕

As explained in detail above, according to the present invention, among the terminal devices connected to the bus wiring of the user/network interface of the basic interface of I5DN, a communication line is set up with the other subscriber and the communication By switching a terminal device other than the terminal device that is in a communication standby state to the broadcast mode, the communication can be viewed on the terminal device, and this effect is particularly great when the content of the communication is broadcast.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the communication method of the present invention, and FIG. 2 is a configuration diagram of an embodiment of the communication terminal device of the present invention. 1...Subscriber A, 2...Subscriber B, 3...Integrated service digital network (l5DN), 4...Bus wiring, TEJ a. TE2a, 10... Communication terminal device, TE2b-TE
2h...Broadcast mode setting terminal device, 11...Layer 1 control unit, 12...Layer 2/3 control unit, 13...
- Operation control unit, 14... Operation unit, 14a... Dial, 14b... Broadcast mode setting key 15... Broadcast mode control means, 16... First switch means, 17.
... second switch means, 18... third switch means,
19... Information channel switching means, 20... Data input/output section, 21... Audio input/output section, 22... Keyboard, 23... Display device, 24... Microphone, 25...
speaker.

Claims (1)

[Claims] 1. Connected by a user/network interface of the basic interface of the integrated service digital network, and connected to the user/network interface.
A communication method in which a plurality of communication terminal devices are connected to the bus wiring of a network interface and communication is performed between network subscribers via the integrated service digital network, wherein each of the plurality of communication terminal devices is connected between the subscribers. When a communication line is set up and communication is performed via the network using one of the above, communication terminal devices that are in a communication standby state other than the communication terminal device performing the communication change the function of the device to broadcast mode. By setting, it is possible to prohibit the transmission and reception of signals via the signal channel, and also to prohibit the sending of information to the information channel, so that only information input via the information channel can be received in broadcast mode. A communication method in a comprehensive service digital network characterized by the following. 2. A broadcast mode that is set so that information from an information channel input via the bus wiring can be received in a broadcast mode by a communication terminal device connected to the bus wiring of the user/network interface and in a communication standby state. settings key and
Layer 1 of the protocol of the integrated service digital network
a first switch means for opening and closing the connection between the control unit and the layer 2/3 control unit; and information for switching an input/output circuit of information controlled by the layer 2/3 control unit and input/output via the information channel. A channel switching means, second and third switch means for opening and closing information output from the means, and a layer 2/3 switching means operated by pressing the broadcast mode setting key.
3. A communication terminal device comprising broadcast mode control means for opening the first, second and third switch means after detecting that the third control section is in a communication standby state.