JPH05145565A - Isdn data transmission control system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by connecting plural ISDN terminal equipments in a ring through an ISDN exchange with a B-channel transmission line, thereby enabling the transmission of the same data to plural terminal equipments. CONSTITUTION:When an ISDN terminal equipment TE1 of a primary station selects one of terminal equipments TE2-TEn of secondary stations and sends data to a data reception section R1 of a control section CT of the terminal equipment, the control section CT throws a changeover circuit SW2 to the position of a data transmission section S2, which transmits reply data. Then the reception section R2 of the TE1 receives data to attain semi-duplex communication. When the TE1 sends data to a reception section R2 of the TEn, the control section CT of the TEn throws a changeover circuit SW1 to the position of a transmission section S1 and when the S1 transmits reply data, the data are received by the reception section R1 of the TE1. Thus, one set of the terminal equipment simultaneously transmits the same data to N-sets of terminal equipments, and transmits independent data through the use of two lines thereby improving the transmission efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online system using ISDN, and more particularly to a data transmission control system for connecting ISDN terminal devices.

[0002]

2. Description of the Related Art A conventional device is disclosed in Japanese Examined Patent Publication No. 62-15744.
As described in 2 gazette, the connection between ISDN terminal devices is
It is a connection form in which point-to-point connection is made via a DN switch, and a multipoint connection form in which a plurality of ISDN terminal devices using an ISDN network are connected is not mentioned.

[0003]

The above-mentioned prior art does not consider the connection form for connecting a plurality of subscriber lines and ISDN terminal devices to a multipoint, and the same data is sent to a plurality of ISDN terminal devices. When transmitting, ISD
It is necessary to perform call setting control for each N terminal device and connect the B channel point-to-point to transmit data to the ISDN terminal device. To transmit data of a plurality of ISDN terminal devices, the number of ISDN terminal devices must be increased. There was a problem that it took a minute.

It is an object of the present invention to connect a plurality of ISDN terminal devices in a ring shape to the B channel of an ISDN network via an ISDN switch so that the same data can be transmitted to the plurality of terminal devices. Another object of the present invention is to simultaneously transmit two types of data to the B channel by connecting in the ring shape. Further, it is to efficiently perform call setting control in order to connect the B channels in a ring shape.

[0005]

In order to achieve the above object, the received data of the first B channel of any two circuit-switched B channels in the same subscriber line is converted into the transmitted data of the second B channel. A switching circuit for switching under the control of the control unit of the ISDN terminal device and a switching circuit for switching between the reception data of the second B channel and the transmission data of the first B channel under the control of the control unit of the ISDN terminal device are provided in the ISDN terminal device. There is. In addition, a plurality of ISDN terminal devices are connected in a ring shape via an ISDN exchange by a B channel transmission line to enable data transmission. Also,
ISD of the primary station transmitting data in the above connection configuration
A configuration table showing ISDN address contents of all the terminal devices which are the constituent elements of the ring is provided in the storage unit of the N terminal device, and the call setting operation is sequentially performed to the ISDN terminal devices in accordance with this configuration table, and the terminal devices are mutually connected to the B channel transmission line. I'm trying to connect in a ring. Further, by separately providing the configuration tables corresponding to the two connection route directions, the call setting operation can be performed according to the configuration tables.
From the direction, the ISDN terminal devices can be connected in a ring shape by the B channel transmission line.

[0006]

A plurality of ISDN terminal devices are connected in a ring shape via an ISDN exchange by a B channel transmission line,
The transmission data from the DN terminal device is for each ISDN on the ring.
It is transmitted to the terminal device. Further, the call setting operation is performed from the ISDN terminal device of the primary station to the ISDN terminal device of the next stage according to the configuration table.
By performing the call setting operation on the SDN terminal device, the ISDN terminal devices are connected to each other in a ring shape by the B channel transmission line. Further, the configuration tables are separately provided for the two connection path directions, and the call setting operation is performed from two directions, whereby the ISDN terminal devices are connected to each other in a ring shape in two directions by the B channel transmission path.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a block diagram showing a configuration of an ISDN terminal device TE of the present invention. TE is an ISDN terminal device, L1 is an ISDN layer 1 control unit, LAPD is an ISDN LAPD control unit,
CP is a control processor, SW1 and SW2 are switching circuits, and S
1, S2 are data transmission units, R1 and R2 are data reception units,
OP is an output port, and F1 and F2 are phase absorption circuits.

ET is an ISDN exchange, NT is a line terminating device, S I / F is an S interface, ISDN
The ISDN layer 1 control unit L1 of the terminal equipment TE is connected to the ISDN exchange ET via the S interface and the line terminating equipment NT. The D channel for ISDN call control and the like is controlled from the control processor CP by the ISDN LAPD control unit LAPD.

The first signal channel B1 of the ISDN is connected to the data receiving unit R1 to receive data, and the transmission data is transmitted from the data transmitting unit S1 via the switching circuit SW1.
Send to SDN layer 1 control unit L1, S interface,
Data is transmitted to the ISDN exchange ET via the line terminating equipment NT. Similarly, the second signal channel B2 also receives data at the data receiving unit R2 and the data transmitting unit S2.
To transmit the data via the switching circuit SW2.

The received data of the signal channel B1 is ISD.
Signal channel B1 and signal channel B of the N layer 1 control unit
The switching circuit SW2 is connected to the switching circuit SW2 through the phase absorption circuit F1 that absorbs the phase difference of the data bit between the two, and the switching circuit SW2 is switched by the switching signal output from the output port OP according to the instruction of the control processor CP and transmitted from the signal channel B2. Enable to send as data. Similarly, the reception data from the signal channel B2 is also connected to the switching circuit SW1 via the phase absorption circuit F2, and the switching circuit SW1 is switched by the output port OP so that it can be transmitted as transmission data from the signal channel B1.

Next, the connection structure for connecting the ISDN terminal devices in a ring shape will be described. FIG. 2 shows a connection configuration when connecting ISDN terminal devices in a ring shape. First of all, _one of the two signal channels B of the ISDN terminal equipment TE ₁ of the primary station (one signal channel B consists of two of transmission and reception) is the line terminal equipment NT, ISDN exchange ET, ISDN. via the line terminal NT of the terminal device TE _2, via the line terminating unit NT in ISDN terminal equipment TE _2, connect the secondary station to the ISDN terminal equipment TE _2, TE ₃ from Similarly ISDN terminal equipment TE ₂ ...... TE _m-1 ,
TE _m , TE _{m + 1} , ... TE _n-1 , TE _n
A ring-like structure is formed by connecting the remaining one signal channel B. Construction control of this ring-shaped connection configuration will be described below.

[0012] Figure 3 when connecting the ISDN terminal equipment in a ring form, from ISDN terminal equipment TE ₁ of the primary station, the secondary station ISDN terminal TE _2, TE ₃ ...... first direction (L) And the second direction (R) of TE _n , TE _n-1 ...
The following shows a configuration for sequentially connecting to. Here, the control unit CT includes the control processor CP of FIG. 1, the data transmission units S1 and S2, the data reception units R1 and R2, the output ports OP and ISDN.
It is shown as comprising an LAPD controller.

The ISDN terminal device TE ₁ of the primary station is a configuration table showing the ISDN address contents for connecting the secondary station ISDN terminal devices TE ₂ , TE ₃ ... In the first direction (L). Address tables TE _L and TE
_It has the address table TE _R of FIG. 5 for connecting in the second direction (R) of _n , TE _n-1 ....

The ISDN terminal equipment TE ₁ of the primary station is
T using the control channel D for the DN terminal equipment TE ₂ .
Set up a call with the ISDN address of E ₂ . According to the call setting, the signal channel B is connected to the ISDN terminal device TE.
The data transmitting unit S1 of the control unit CT of ₁ transmits the address table TE _L of FIG. 4, and the transmitted address table TE _L is received by the data receiving unit R1 of the control unit CT of TE ₂ . Similarly, the ISDN terminal device TE of the primary station
Similarly, ₁ sets the call to the ISDN terminal device TE _n using the control channel D at the ISDN address of TE _n . This connects the signal channel B, and TE
The data transmission unit S2 of the control unit CT of ₁ transmits the address table TE _R of FIG. 5, and the transmitted address table TE _R is received by the data reception unit R ₂ of the control unit CT of TE _n . In the transmission of the address table, the entire contents of the address table are transmitted.

FIG. 6 shows a control flow of each ISDN terminal device of the secondary station. When the ISDN terminal device of the secondary station receives the call setup from the D channel and both signal channels B1 and B2 are empty, it responds by connecting one B channel (B1 in the example of FIG. 3) of the signal channels. To do. In the case of the ISDN terminal device TE ₂ shown in FIG.
_{When L} is received, the connected flag is added to the ISDN address of TE ₂ . Then, the call is set up with the ISDN address of the +1 TE, that is, the ISDN address of TE ₃ as the address of the own TE. When TE ₃ does not respond, the TE address that is +2 to the address of the own TE is set up.

When the call setup is answered, the signal channel B (B2 in the example of FIG. 3) is connected to TE ₃ , and the IS
The address table TE _{L in} which the connected flag is added to the DN address is transmitted to TE ₃ , the switching circuit SW1 is switched to the R2 side, the switching circuit SW2 is switched to the R1 side, and the reception data from TE ₁ is received at R1 and at the same time TE ₃ It can be sent as it is as the transmission data. Also, the received data from TE ₃ can be transmitted as it is to TE ₁ , and is placed in a data reception waiting state. In accordance with this control flow, TE
₃ 、 TE ₄ …… Sequentially connect. T in the second direction (R)
The same applies to E _n , TE _n-1, ...

Returning to the control flow of FIG. 6, the signal channel B
_{When 1} and B ₂ are not empty, the connection configuration is configured in a ring shape as shown in FIG. 7 when the TE address table has been received. If the TE address table has not been received, a release process, that is, a process for not connecting so that the own TE does not enter the ring is performed and the process ends.

By performing the ring-shaped connection configuration as described above, the ISDN terminal device TE ₁ of the primary station is
When data is transmitted from the data transmission unit S1 of the control unit CT, the signal channel B is transmitted through the ISDN layer 1 control unit.
1 to the ISDN terminal equipment TE _{2 of the} secondary station via the line terminating equipment NT and the ISDN exchange ET.
At the same time as being received by the data receiving unit R1 of the control unit CT via the ISDN layer 1 control unit L1 via the signal channel B1 via T, the switching circuit SW2 and the signal channel B2 via the ISDN layer 1 control L1 are the same as above. To the IS via the line terminating equipment NT and ISDN exchange ET.
It is received by the DN terminal devices TE ₃ , ... TE _n-1 , TE _n . At the same time, the signaling channel B of the ISDN terminal equipment TE ₁
2, the data receiving unit R2 of the control unit CT causes the ISDN
Since the data transmitted from the data transmission unit S1 of the control unit CT by the terminal device TE ₁ itself is received, it can be confirmed whether or not the data transmitted by the ISDN terminal device TE ₁ can be received by the ISDN terminal device of the secondary station.

On the other hand, the transmission data is also transmitted from the data transmission unit S2 of the control unit CT of the ISDN terminal device TE ₁ of the primary station, and the ISDN layer 1 control unit L1 and the line termination device N are transmitted.
T, ISDN exchange ET, data receiving section R2 of control section CT of ISDN terminal equipment TE _n , and switching circuit SW
1, through the ISDN layer 1 control unit L1, TE _n-1 ,
... TE ₃ , TE ₂ are received from the signal channel B2 opposite to the above-mentioned signal channel and transmitted from the signal channel B1. Finally, the transmission data from the data transmission unit S2 of the control unit CT can be received by the data reception unit R1 of the control unit CT from the signal channel B1 of TE ₁ .

As explained above, from the ISDN terminal equipment TE ₁ of the primary station to the ISDN terminal equipments TE ₂ , T of the secondary station.
E ₃ ... Connection structure of TE _n-1 and TE _n in the first direction, and ISDN terminal device TE _{1 of the} primary station to IS of the secondary station
A connection configuration in the second direction to the DN terminal equipments TE _n , TE _n-1, ... TE ₃ , TE ₂ can be constructed. As a result, data can be transmitted simultaneously from the two signal channels B1 and B2.

Next, in the ring-shaped connection configuration of FIG. 7, from the ISDN terminal device TE ₁ of the primary station to the IDN of the secondary station.
A case will be described in which the SDN terminal devices TE _{2 to} TE _n are selected one by one for communication and communication is performed by a so-called polling selection method. For example, if the ISDN terminal equipment TE _{3 of} the selected secondary station responds, T
When sent from E ₁ to the data reception section R1 of the control unit CT of the TE _3, the control unit CT of the TE ₃ is a switching circuit SW2
To the data transmission unit S2 side of the control unit CT, and the control unit C
When the response data is sent from S2 of T, the ISD of the primary station
The data reception section R2 of the control section CT of the N terminal device TE ₁ enables half-duplex communication by the polling selection method. When the data is transmitted from TE ₁ to the data receiving unit R2 of the control unit CT of TE ₃ ,
The control unit CT of E ₃ switches the switching circuit SW1 to the data transmission unit S1 side of the control unit CT, and the data transmission unit S of the control unit CT is changed.
When the response data is transmitted from ₁ , the data receiving unit R1 of the control unit CT of the TE ₁ can receive the data, so that in this ring-shaped connection configuration, half-duplex communication by the polling selection method of two lines is possible.

In the above description, the primary station is TE
_Although it was set to ₁ , TE _{2 because} it has a ring-shaped connection configuration
Any of the ISDN terminal devices of ~ TE _n may be the primary station. Also, in the explanation of the ring-shaped connection configuration,
The signal channels B1 and B2 have been described as fixed, but
Even if the signal channels B1 and B2 are switched due to the connection of the ISDN exchange, the ring-shaped connection configuration and control can be made the same.

As shown in the above embodiments, the ISD
According to the N address table, the ISDN terminal devices activated by the call setting operation are mutually connected by the B channel, so that the plurality of activated ISDN terminal devices are all ring-shaped via the B channel communication path. With the connection configuration, two lines of data can be simultaneously transmitted to each ISDN terminal device by using two B channels.

[0024]

According to the present invention, since the ring-like connection configuration can be constructed by utilizing the circuit switching mode of ISDN, one-to-N communication becomes possible, and the same data can be transmitted from one terminal to N units. The data can be simultaneously transmitted to the terminal, and independent data can be transmitted by using two lines, which has the effect of improving the transmission efficiency. Further, there is an effect that software and applications such as a branching system realized by a dedicated line for 1 to N communication can be realized on ISDN.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram in which a plurality of ISDN terminal devices are connected in a ring shape between ISDN terminal devices via an ISDN exchange.

FIG. 3 ISDN terminal device of primary station to ISD of secondary station
It is a connection diagram for connecting to N terminal devices.

FIG. 4 is a diagram showing an address table of TE _L which is an ISDN address table.

FIG. 5 is a diagram showing an address table of TE _R which is an ISDN address table.

FIG. 6 is a call setting control flow chart of the ISDN terminal device.

FIG. 7 is a diagram showing a configuration in which a plurality of ISDN terminal devices are connected in a ring shape.

[Explanation of symbols]

 ET ISDN exchange NT line terminating device TE ISDN terminal device L1 ISDN layer 1 control unit LAPD ISD NLAPD control unit CP control processor SW1, SW2 switching circuit S1, S2 data transmission unit R1, R2 data reception unit OP output port F1, F2 phase absorption Circuit CT controller

Claims (4)

[Claims] 1. A plurality of ISDN terminal devices connected to an ISDN-standard user network interface receive received data of a first B channel of arbitrary two circuit-switched B channels in the same subscriber line. IS for the B channel transmission data
A switching circuit that switches under the control of the control unit of the DN terminal device and a switching circuit that switches between the reception data of the second B channel and the transmission data of the first B channel under the control of the control unit of the ISDN terminal device are provided, and each adjacent ISDN is provided. An ISDN data transmission control method for performing data transmission by connecting a plurality of ISDN terminal devices in a ring shape by connecting the two circuit-switched B channels between the terminal devices via an ISDN switch. 2. The ISDN data transmission control method according to claim 1, wherein the ISDN terminals of a plurality of secondary stations that receive data from two B channels of an ISDN terminal device of a primary station that transmits data. An ISDN data transmission control method characterized by transmitting data to a device. 3. The ISDN data transmission control method according to claim 1, wherein all ISDNs which are constituent elements of the ring are stored in the storage unit of the ISDN terminal device of the primary station which transmits data.
A configuration table indicating the ISDN address contents of the terminal device is provided, and the call setting operation is performed for the ISDN terminal device of the next stage according to the configuration table. Then, the ISDN terminal device which has successively performed the call setting operation is the ISDN of the next stage. An ISDN data transmission control system characterized in that the call setting operation is performed on a terminal device, and the ISDN terminal devices are connected to each other in a ring shape by a B channel transmission line. 4. The ISDN data transmission control method according to claim 3, wherein a configuration table is separately provided in the storage unit of the ISDN terminal device of the primary station for two connection route directions, and the call setup is performed according to the configuration table. An ISDN data transmission control method characterized in that operations are performed from two directions and the ISDN terminal devices are connected to each other in a ring shape by a B channel transmission line.