JPH06177877A - Isdn data terminal equipment - Google Patents

Abstract

PURPOSE:To reduce the load of an outgoing terminal equipment and also to reduce the difference of reception end time between terminal equipments when the same data are transmitted to all ISDN data terminal equipments connected to the same ISDN circuits from an ISDN data terminal equipment connected to another ISDN circuit. CONSTITUTION:An ISDN data terminal equipment contains a key station registering part 15 which registers a key station among the ISDN data terminal equipments connected to the same circuit, a local bus connection terminal 17 which is connected to the local buses which connect the data terminal equipment with each other via the signal lines, options of an ISDN basic interface, an operation mode switching part 16 which transmits the data received at the key station to the local buses if these data are specific, and a local bus input/ output control part 14 which controls the transmission/reception of data on the local buses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an ISDN data terminal device connected to a plurality of ISDN lines.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing an outline of a conventional communication system connected to an ISDN network.

The configuration of a conventional communication system will be described with reference to FIG. A network terminating device (DSU) 2.3 connected to the ISDN network 1 and an ISD connected to the DSU 2.
IS connected to N data terminal device 4 and the other DSU 3
Communication system is configured by DN data terminal device _{5 a · 5 b · 5 c} · 5 d.

[0004] Next, the operation will be described when sending the ISDN data terminal equipment ISDN data terminal equipment of the same data from the 4 connected to the same ISDN line _{5 a · 5 b · 5 c} · 5 d. FIG. 5 is a flowchart showing the operation in this case. FIG. 5A shows the operation of the ISDN data terminal device 4 on the originating side in this case. Also, FIG.
(B) shows the operation of the ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d which is a called party in this case.

First, the operation of the originating ISDN data terminal device 4 will be described with reference to FIG. Calling party I
SDN data terminal device 4, the ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d that need to send data I
The SDN number and the sub address are read from the registration table in the ISDN data terminal device 4 as the ISDN address. The number of ISDN data terminal devices that transmit data at this time is the same as the number of read ISDN addresses (4 addresses in this example). The ISDN data terminal device 4 substitutes the number of terminals into the variable max, and sets the variable count for counting the number of terminals that have transmitted data to 0. Next, count is compared with max. At this time, c
If out ≧ max, it indicates that there is no terminal device that transmits data. When count <max, the read ISDN address is substituted into the variable telno.
The ISDN data terminal device 4 uses this substituted teln.
Call o. The line with the terminal device that made this call is connected. After that, the data is transmitted. The line is disconnected after the data transmission is completed. After that, the variable co that counts the number of terminals
Add 1 to unt. Next, the count plus 1 is compared with the variable max. After that, in this comparison, call-line connection-data transmission-line disconnection-count + 1 is similarly repeated until count ≧ max (in this example, data transmission is required four times). When comparing count and max, cou
When nt ≧ max, the data transmission is completed to all the ISDN data terminal devices that need the data transmission. From this, the originating ISDN data terminal device 4 ends the data transmission.

[0006] Next, with reference to FIG. 3 (b), illustrating the operation of the receiving-side ISDN data terminal device _{5 a · 5 b · 5 c} · 5 d. A connection request from the originating ISDN data terminal device 4 is sent from the ISDN network. When the ISDN address included in the connection request matches the ISDN address of the own terminal, this call is accepted as an incoming call.

On the other hand, if they do not match, they are ignored. When the outgoing call is accepted as an incoming call, the line is connected to the originating ISDN data terminal device 4. After the line is connected, the data transmitted from the originating ISDN data terminal device 4 is received. After receiving the data, the line is disconnected and the operation ends. Also, the receiving ISDN data terminal device 5 _{a
· 5 b · 5 c · 5} d is, the originating IS is the calling of one by each one
It is sent from the DN data terminal device 4. This allows
Data transmitted from the ISDN data terminal device 4 is received by the terminating ISDN data terminal device _{5 a · 5 b · 5 c} · 5 d.

[0008]

However, the same data is transmitted to all ISDN data terminal devices connected to the same line (up to eight ISDN data terminal devices are allowed to connect to the ISDN line. When sending, the originating ISDN data terminal device 4 needs to perform call-line connection-line disconnection (up to eight times per line) to all ISDN data terminal devices that need to transmit data. There is. Therefore, the originating ISDN data terminal device 4
There was a drawback that the load on the In addition, it takes more time to send the data, and the I
SDN data terminal and ISD last received data
In the N data terminal device, a considerable time difference occurs in the data reception completion time. For example, when the same video and audio information is simultaneously transmitted to a plurality of ISDN data terminal devices via the ISDN network 1, a reception completion time difference occurs in the data receiving terminal device. For this reason, there is a drawback that the operation start time after completion of reception of the transmitted data is largely deviated between the receiving side terminal devices.

An object of the present invention is to copy the same data into the same I
When transmitting to a plurality of ISDN data terminal devices connected to the SDN line, data communication is performed in which the load on the originating ISDN data terminal device is reduced and the difference in reception completion time between ISDN data terminal devices receiving data is small. The object of the present invention is to provide an ISDN data terminal device that can be used.

[0010]

An ISDN data terminal device of the present invention comprises a representative station registration unit for registering any one of a plurality of ISDN data terminal devices connected to the same ISDN line as a representative station. , A local bus connecting terminal connected to a local bus arranged between the plurality of ISDN data terminal devices, and transmitting predetermined data via an ISDN line when registered as a representative station in the representative station registration unit. When the data is received, the data is transferred to the plurality of ISDs.
And a local bus input / output control unit for controlling transmission / reception of data on the local bus. Characterize.

Further, the local bus is constituted by a signal line of an ISDN basic interface.

[0012]

The ISDN data terminal device of the present invention has a plurality of ISDs connected to the same ISDN line in the representative station registration section.
Any one of the N data terminal devices is registered as a representative station. Further, the operation mode switching unit changes the operation of the ISDN data terminal device registered in the representative station and other ISDN data terminal devices. Here, when the same data is transmitted from an ISDN data terminal device connected to another ISDN line to all the ISDN data terminal devices connected to the same line, the transmitting side ISDN data terminal device is Data is transmitted to the representative station of the ISDN data terminal device. On the other hand, a local bus is provided between a plurality of ISDN data terminal devices connected to the same line on the receiving side by a signal line which is an option for the ISDN basic interface. By connecting this local bus to the local bus connection terminal of each ISDN data terminal device, ISDN
Configure a local bus between terminal devices. The representative station receives the transmitted data. After the reception is completed, if the specific data is added to the data, the local bus input / output control unit sends the received data onto the local bus. The ISDN data terminal device, which is a slave station, reads the data sent on the local bus through the local bus input / output control unit. This allows the sending IS
The DN data terminal equipment is connected to all the I lines connected to the same line.
This means that the same data has been transmitted to the SDN data terminal device.

[0013]

FIG. 6 is a diagram showing a connection between an ISDN data terminal device and a network terminating device (DSU) based on CCITT (International Telegraph and Telephone Advisory Committee) regulations. In normal data communication via the ISDN network, data is transmitted / received by four signal lines as shown in FIG. The ISDN data terminal device according to the present invention uses four signal lines, which are not used normally, among the eight signal lines which are the basic interfaces of ISDN, which are treated as options. By using these four signal lines, a local bus is configured between ISDN data terminal devices connected to the same ISDN line.

[0014] Next, the configuration of the ISDN data terminal device _{5 a · 5 b · 5 c} · 5 d is an embodiment of the present invention in FIG. An ISD that is an embodiment of the present invention with reference to FIG.
The structure of the N data terminal device _{5 a · 5 b · 5 c} · 5 d will be described. An incoming call monitoring unit 11 that monitors a connection request sent via the ISDN network 1, a call control unit 12 that outputs a connection request to an ISDN data terminal device connected via the ISDN network 1, and an ISDN network. 1, an ISDN input / output control unit 13 for controlling data transmission / reception, a local bus input / output control unit 14 for controlling data input / output on a local bus, and a representative station of an ISDN data terminal device connected by a local bus. Representative station registration unit 15 for registering ISDN and ISDN
An operation mode switching unit 16 for switching the operation when the data terminal device is the representative station and the slave station, and a local bus connection terminal which constitutes a local bus by connecting the plurality of ISDN data terminal devices by a signal line. 17 and an ISDN connection terminal 18 connected to the network terminating device 3 connected to the ISDN network 1.

FIG. 2 is a diagram showing an outline of the configuration of a communication system via the ISDN network according to the present invention. The configuration of a communication system using the ISDN data terminal device of the present invention will be described with reference to FIG. ISD, which is a public network
Network terminating device 2, 3 connected to the N network 1, ISDN data terminal connected to the network terminating device 2 device 4, ISDN data terminal equipment 5 _{a-5 b} connected to the other network terminating device 3・ It is composed of 5 _c and 5 _d . Also,
With the ISDN data terminal device 5a as _a representative station, ISD
The N data terminal devices _5a , _5b , _5c , _5d are connected to the local bus. The operations of the representative station and the slave station have the following differences. The representative station determines whether or not the data sent via the ISDN line is necessary for all ISDN data terminal devices connected to the same line, and if so, sends the data to the local bus. To do. On the other hand, the slave station fetches the data sent from the representative station on the local bus. This change in operation is switched by the operation mode switching unit 16. The representative station is registered in the representative station registration unit 15 in the ISDN data terminal device body, and the representative station can be freely changed.

[0016] Figure 3, ISDN data terminal equipment 5 _a the same data from the ISDN data terminal device 4 according to the invention
It is a diagram showing a flowchart for sending, to the _{5 b · 5 c · 5 d} . FIG. 3A shows a flowchart of the ISDN terminal device 4 on the calling side. FIG. 3B shows _a flowchart of the ISDN data terminal device 5 _a which serves as a representative station on the receiving side. In FIG. 3C, I becomes a slave station on the receiving side.
SDN shows a flowchart of a data terminal device _{5 b · 5 c · 5 d} . With reference to FIG. 3, ISDN data terminal device _{5 a · 5 b · 5 c} · 5 from the ISDN data terminal equipment 4
The operation when the same data is transmitted to _d will be described.

First, the operation of the ISDN terminal device 4 on the calling side will be described with reference to FIG. ISD
ISDN data terminal device 4 transmits the data via the N network 1 is the representative station of the ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d to send the data from its registration table ISDN of ISDN data terminal equipment 5 _a
Read the address from its own registration table. Next, the read ISDN address is substituted into the variable telno. In addition, the data field (st
r). Then, information indicating that the data to be transmitted to the ISDN data terminal device _{5 a · 5 b · 5 c} · 5 d which are connected to the same ISDN line is substituted into DATATYPE, this DATATYPE the beginning of the data field Add. Meanwhile, the data to be transmitted by substituting the information indicating this fact as well when transmitting only the ISDN data terminal device 5 _a to DATATYPE, is prepended to the data field. After constructing the transmission data, te
Make a call to lno. After the line of the ISDN data terminal equipment 5 _a to the reception side is connected, to transmit the data. After completion of data transmission, ISDN data terminal device 4
Disconnects the line and ends the operation.

Next, with reference to FIG. 3 (b), description will be given of the operation of ISDN data terminal equipment 5 _a as a representative on the receiving side. The incoming call monitoring unit 11 accepts an outgoing call from the originating ISDN data terminal device 4 as an incoming call. By accepting this incoming call, the line is connected to the originating ISDN data terminal device 4. After the line is connected, the ISDN input / output control unit 13 receives the data sent from the ISDN data terminal device 4. When the reception of the transmitted data is completed, the line with the ISDN data terminal device 4 is disconnected. After that, the DATANPE added to the head of the data received by the ISDN input / output control unit 13 is read out, and whether the received data is sent only to itself or an ISDN data terminal device connected on the same line the 5 _b · 5 transmission to _c · 5 _d and determines whether necessary. In this determination, if the data is sent only to itself, the operation ends. On the other hand, all of the ISDN data terminal equipment 5 _{b-5 c,} which is connected on the same line,
If 5 transmission to _d is determined to be necessary, to enter the data transmitted from the ISDN data terminal device 4 to the local bus output control section 14. Local bus output control section 14 terminates the operation by sending to the local bus that is configured the entered data between ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d.

Next, with reference to FIG. 3 (c), the a slave station on the receiving side ISDN data terminal device 5 _b · 5 _c · 5 _d
The operation of will be described. When ISDN data terminal device 5 _a is the representative station sends the data on the local bus, that there is data on the local bus in the local bus output control section 14 of the ISDN data terminal equipment 5 _b · 5 _c · 5 _d To detect. When it is detected that there is data on the local bus, the local bus input / output control unit 14 reads the data on the local bus. The operation ends when the reading of the data on the local bus is completed.

By operating in this manner, the originating side I
Data to be transmitted occurring in SDN data terminal device 4 only transmits the ISDN data terminal device 5 _a, which is the representative station of the ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d connected to the ISDN line in can transmit data to all of the ISDN data terminal equipment _{5 a · 5 b · 5 c} · 5 d.

[0021]

As described above, according to the present invention, when the same data is transmitted to a plurality of ISDN data terminal devices connected on the same line, the ISDN data terminal device on the transmitting side is connected to the line. -Data transmission-The line needs to be disconnected only once. As a result, the load on the originating ISDN data terminal device is reduced and the communication cost is reduced. Further, since the data received by the representative station is transmitted to the other station via the local bus, the time from the reception of the data by the representative station to the completion of the data reception by the other station becomes short. As a result, when the same video and audio information is simultaneously transmitted to a plurality of ISDN data terminal devices connected to the same line via the ISDN network, the data reception completion time of the ISDN data terminal device on the receiving side is almost the same. be able to. As a result, the operation start time after the completion of reception of the transmitted data can be made substantially the same.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an ISDN data terminal device according to the present invention.

FIG. 2 is a diagram showing an outline of a communication system according to the present invention connected to an ISDN network.

FIG. 3 is a diagram showing a flow chart when the same data is transmitted from the ISDN data terminal device to the ISDN data terminal device according to the present invention.

FIG. 4 is a diagram showing an outline of a conventional communication system connected to an ISDN network.

FIG. 5 is a diagram showing a flowchart in the case where the same data is transmitted from an ISDN data terminal device to a conventional ISDN data terminal device.

FIG. 6 ISDN data terminal equipment and network terminating equipment (DS) based on CCITT (International Telegraph and Telephone Advisory Committee) regulations.
It is a figure which shows the connection of (U).

[Explanation of symbols]

1-ISDN network 2-3 network terminating device (DSU) 4-ISDN data terminal device _{5 a · 5 b · 5 c} · 5 d -ISDN data terminal device 11 incoming call monitoring unit 12 the calling control section 13-ISDN Input / output control unit 14-Local bus input / output control unit 15-Representative station registration unit 16-Operation mode switching unit 17-Local bus connection terminal 18-ISDN connection terminal

Claims (2)

[Claims] 1. An incoming call monitoring unit that receives a connection request sent from an ISDN network, a call control unit that sends a connection request to the ISDN network, and an ISDN input / output control that controls data transmission / reception to / from the ISDN network. An ISDN data terminal device having a section, a representative station registration unit that registers any one of a plurality of ISDN data terminal devices connected to the same ISDN line as a representative station, and the plurality of IS
When a predetermined data is sent through an ISDN line while being registered as a representative station in the representative station registration unit, a local bus connecting terminal connected to a local bus arranged between DN data terminal devices. An operation mode switching section for switching the data to an operation mode for transmitting the data to a local bus arranged between the plurality of ISDN data terminal devices, and a local bus input for controlling transmission / reception of data on the local bus. An ISDN data terminal device comprising an output control unit. 2. The ISDN data terminal device according to claim 1, wherein the local bus comprises a signal line of an ISDN basic interface.