JP2000358034A - Device and method for sending data with atm switch as main switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent resources of an ATM-SW from being uselessly consumed and to unnecessitate the tone reproducing device. SOLUTION: An ATM-SW 3 is interposed on a communication line between a data generator 2 and a data distributor 1. The data generator 2 generates a data ATM cell 8 and a broadcast information ATM cell 9 and sets the paths of a proper number between the data generator 2 and the data distributor 1 on the basis of the headers of the data ATM cell 8 and the broadcast information ATM cell 9 and that proper number is less than the number of plural terminals requesting data and especially single.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission apparatus and a data transmission method using an ATM switch as a main switch, and more particularly to a data transmission apparatus and a data transmission method using an ATM switch for performing broadcast communication over an ATM network as a main switch. Regarding the sending method.

[0002]

2. Description of the Related Art To transmit a tone to a plurality of terminals, A
A TM-SW is provided. The tone transmission method is
As shown in FIG. 5, according to the tone request of the terminal 101, the tone generator 102 generates an ATM cell 10 which is a tone signal.
3 has been generated. If a plurality of terminals 101 request a tone at the same time, the ATM cell 103
The VPI / VCI is set for each of the plurality of copied ATM cells 105 copied by the M-cell copying device 104 and the ATM
-Send to SW106. The ATM-SW 106 that has received the plurality of tone signal ATM cells receives the ATM cells 105.
And a path is set for each of the terminals 101 that make a tone request, and a tone AT, which is a tone signal, is sent to all terminals.
M cell 107 was being sent.

[0003] Such broadcast communication has two problems. The first problem is that resources of the ATM-SW 106 are wasted to transmit tones to a plurality of terminals. The reason is that since a tone transmission path is individually set for all terminals that make tone requests, resources of the ATM-SW are used by the number of tone requests. The second problem is that a tone duplicating device is required in addition to the tone generating device, because the ATM cells of the tone are duplicated by the number of requested tones and VPI / VCI is set for each. The reason is,
Since tone transmission by the ATM-SW is performed in a one-to-one path connection, tone signals are required by the number of terminals requesting a tone.

It is desired that ATM-SW resources are not wasted. Further, it is preferable not to provide a tone duplication device.

[0005]

The object of the present invention is to provide an AT
ATM that does not waste M-SW resources
An object of the present invention is to provide a data transmission device and a data transmission method using a switch as a main switch. Another subject of the present invention is:
An object of the present invention is to provide a data transmission device and a data transmission method using an ATM switch as a main switch without wasting resources of the ATM-SW and eliminating the need for providing a data duplication device.

[0006]

Means for solving the problem are described as follows. The technical matters corresponding to the claims in the expression are appended with numbers, symbols, etc. in parentheses (). The number, the symbol, etc. are at least one of the technical matters corresponding to the claims and the plurality of embodiments.
Although the agreement / correspondence with the technical matters of the two forms is clarified, it is not intended to show that the technical matters corresponding to the claims are limited to the technical matters of the embodiment.

A data transmission device having an ATM switch as a main switch according to the present invention comprises a data generation device (2), a data distribution device (1), and a data generation device (2) and a data distribution device (1). ATM-S interposed in the communication line of
W (3), the data generating device (2) generates a data ATM cell (8) and a broadcast information ATM cell (9), and the ATM-SW (3) generates a data ATM cell (8). Based on the header of the broadcast information ATM cell (9), an appropriate number of paths are set between the data generation device (2) and the data distribution device (1), and the appropriate number is determined by a plurality of terminals requesting data. Smaller than the number, and the ATM-SW
(3) The data ATM cell (8) and the broadcast information ATM cell (9) are switched to send the data ATM cell (8) and the broadcast information ATM cell (9) to the data distribution device (1). , The data distribution device (1)
After converting the M cell (8) into an STM data signal (12) based on the header, the data signal of the STM data signal (12) is switched and broadcast to the terminal 7 which has requested data.

By transmitting such data, the data AT
Reduce the number of duplication devices that generate M cells (8)
-SW (3) path setting is minimized and ATM-SW
(3) The resources can be effectively used. The number of paths set can be single. As is well known, the header of the overhead has VPI / VCI.
It is the same as the well-known device that a sequence number is given to the broadcast information ATM cell (9) and the data ATM cell (8).

More specifically, the data generating device (2) receives a data request from a plurality of terminals (7) and generates a broadcast information in response to a data request, and generates a data signal. Data information generating device (23), a header generating device (24) for generating a header, a broadcast information ATM cell (9) from the broadcast information and the header, and further a data signal and its header. And a cell assembling section (25) for assembling a data ATM cell (8).

More specifically, the data distribution device (1) converts a data ATM cell (8) into an STM based on a header.
Cladding (4) for converting to data signal (12)
And a TIME-SW (6), and a TIME-SW control unit (5) for controlling the TIME-SW (6). The TIME-SW (6) receives the STM data signal (1
2) The switching is performed under the control of the TIME-SW control unit (5).

A data transmission method using an ATM switch as a main switch according to the present invention comprises a broadcast information AT having broadcast information.
Generating an M cell (9) and a data ATM cell (8), transmitting the broadcast information ATM cell (9) and the data ATM cell (8) to the data distribution device (1) by a single line using the ATM-SW (3). Data A based on the broadcast information
The data of the TM cell (8) is distributed by the TIME-SW (6) and transmitted to a plurality of terminals (7).
Single line distribution becomes possible.

The data transmission method using the ATM switch as a main switch is, specifically, to extract broadcast information from the broadcast information ATM cell (9) and to convert the data ATM cell (8) to STM data (12). , And creating switching information for the STM data (12) based on the broadcast information. The data to be distributed and transmitted of the cell data is digital data, and includes audio and video data.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Corresponding to the drawings, an embodiment of a data transmission apparatus having an ATM switch as a main switch according to the present invention is provided with a tone distribution apparatus connected to a plurality of terminals. Tone distribution device 1 is connected to tone generation device 2. An ATM-SW 3 is interposed between the tone distribution device 1 and the tone generation device 2. The tone distribution device 1 includes a CLAD 4, a TIME-SW control unit 5, and a TIME-SW (STM switch) 6. Each of the plurality of terminals 7 is connected to the tone distribution device 1.

The tone generator 2 receives a tone request from a plurality of terminals 7, generates broadcast information and a tone signal, and further generates overhead. The overhead has VPI / VCI. The tone generator 2 first assembles a broadcast information ATM cell 9 from the broadcast information and the overhead.

Next, the tone generator 2 assembles a tone ATM cell 8 from the tone signal and the overhead. A sequence number is given to the broadcast information ATM cell 9 and the tone ATM cell 8. Broadcast information ATM cell 9 and tone ATM cell 8 provided with a sequence number
Is sent to the ATM-SW3.

The ATM-SW 3 stores the tone ATM cell 8 received from the tone generator 2 and the broadcast information ATM cell 9
A path is set between the tone generation device 2 and the tone distribution device 1 by looking at the VPI / VCI information in the overhead section of FIG. The path may be one. The ATM-SW 3 performs switching between the tone ATM cell 8 and the broadcast information ATM cell 9, and performs switching between the tone ATM cell 8 and the broadcast information ATM cell 9.
To the tone distribution device 1.

The broadcast information ATM cell 9 and the tone ATM cell 8 are transmitted to the CLAD 4 belonging to the tone distribution device 1.
, The sequence number is checked. The broadcast information ATM cell 9 which has arrived first has its broadcast information extracted and sent to the TIME-SW control unit 5.

The tone ATM cell 8 stores STM time-division multiplexed data (S
(TM tone signal) 12 and transmitted to the TIME-SW 6. The tone ATM cell 8 is allocated to a time slot of the STM tone signal 12. The TIME-SW control unit 5 of the tone distribution device 1 creates switching information on the tone signal based on the broadcast information received from the CLAD 4, controls the switching of the TIME-SW 6, and sends the STM tone transmitted to the TIME-SW 6. Terminal 7 switching signal 12 and requesting a tone
And send it out.

FIG. 2 shows the details of the tone generator 2. The tone generation device 2 includes a control unit 21 and a control unit 21.
Information generation unit 22, sound source generation device 2 controlled by
3, a header generation unit 24. The broadcast information generation unit 22, the sound source generation unit 23, and the header generation unit 24 are connected to the ATM cell assembly unit in the tone generation device 2.

When the tone generator 2 receives a tone transmission request from a plurality of terminals 7 at the same time, the controller 21 of the tone generator 2 writes information on which terminal to broadcast to the broadcast information generator 22. The generated tone data is generated, and further, a tone (a dial tone, a ringback tone, or the like) meeting the request is generated by the sound source generator 23.

Next, the control unit 21 includes a header generation unit 24
A tone ATM cell 8 for transferring broadcast data and a tone signal corresponding to the tone, and broadcast information AT
A header added to the M cell 9 is generated. A specific VPI / VCI corresponding to the distribution device 1 requested by the data is added to the header. ATM cell assembly unit 25
Receives the data of the broadcast information from the broadcast information generation unit 22, receives the tone signal from the sound source generation unit 23, receives the ATM cell header from the header generation unit 24, and stores the broadcast information ATM cell 9 first, and then , Tone AT
The M cell 8 is assembled, a sequence number is added to its header, and the M cell 8 is transmitted to the ATM-SW3.

FIG. 3 shows details of the tone distribution device 1. The tone distribution device 1 includes a broadcast cell extracting unit 26 in the CLAD 4. The broadcast information ATM cell 9 and the tone ATM cell 8 sent to the tone distribution device 1 are input to the broadcast cell extracting unit 26. The broadcast cell extraction unit 26
The sequence number is checked, and the broadcast information ATM cell 9 which has arrived first is sent to the TIME-SW control unit 5.

The broadcast cell extracting unit 26 is connected to the tone ATM cell receiving unit 27 in the CLAD 4. The tone ATM cell 8 transmitted following the broadcast information ATM cell 9
Is sent to the tone ATM cell receiving section 27. Tone A
The TM cell receiving unit 27 decomposes the received tone ATM cell 8 into an overhead 31 and a payload 32, and sends the overhead information 31 to the conversion control unit 28 and the tone voice payload 32 to the ATM-STM conversion unit 29.

In the conversion control unit 28, the VC in the overhead information received from the tone ATM cell receiving unit 27
I, and determines to which time slot of the STM data 12 the payload 32 of the tone signal sent to the ATM-STM converter 29 is to be assigned, and based on the conversion information, the ATM-STM converter 29 Is converted into the time division multiplexed signal 12 of the STM, and the
Send it to ME-SW6.

Further, in the TIME-SW control unit 5, based on the broadcast information of the broadcast information ATM cell 9 received from the broadcast cell extraction unit 26 by the switching information generation unit 33,
The switching path of the TM tone signal 12 is determined, and the TIME-SW is determined by the switching controller 34 based on the switching path determined by the switching information generator 33.
6, and sends the STM tone signal 12 sent to the TIME-SW 6 to the plurality of terminals 7 that are making tone requests.

FIG. 4 shows another embodiment according to the present invention. A database 41 is provided instead of the tone generation device 2. FIG. 4 shows an embodiment in which user data (moving image, data) is broadcast. When the database 41 of moving images, data, and the like receives a data transmission request from a plurality of user terminals 7 ′ at the same time,
The control unit 21 ′ of the database 41 includes the broadcast information generation unit 2
2 ′ generates data in which information on which terminal 7 ′ is to be broadcast is written.

Next, the control unit 21 '
A for transferring broadcast data and user data to 4 '
A header to be added to the TM cell 8 'is generated. A specific VPI / VCI corresponding to the broadcast data distribution device 1 'requested by the data is added to this header. A
The TM cell assembling unit 25 'receives the broadcast information data from the broadcast information generating unit 22' and the transmission data from the data storage unit 23 ', and first receives the ATM cell header from the header generating unit 24'. Data ATM cell 8 '
Next, the user data ATM cell is assembled, a sequence number is added to the header, and the ATM cell is transmitted to the ATM-SW 3 '.

In the ATM-SW 3 ', the database 2
Looking at the VPI / VCI information in the overhead part of the ATM cell 8 'received from 1', only one path is set between the database 21 'and the broadcast data distribution device 1'.
The TM cell 8 'is switched, and the ATM cell 8' is transmitted to the broadcast data distribution device 1 '. The ATM cell 8 'sent to the broadcast data distribution device 1' is sent to the broadcast cell extraction unit 2
6 ', the broadcast cell extracting unit 26' checks the sequence number and sends the first broadcast information ATM cell which has arrived to the TIME-SW control unit 5. The subsequent user data ATM cell 8 'is transmitted to the user data ATM cell receiver 2
Send to 7 '.

The user data ATM cell receiving section 27 'decomposes the ATM cell 8' into overhead information 31 'and a payload 32'. The overhead information 31 'is converted into a conversion control section 28', and the payload 32 'is converted into an ATM-STM converting section. It is sent to 29 '. The conversion control unit 28 'detects the VCI in the overhead information 31' received from the user data ATM cell receiving unit 27 'and determines to which time slot of the STM data the ATM cell 8' of the user data is allocated.

Based on the conversion information, the ATM-STM conversion unit 29 'converts the user data payload 32' into the STM data.
To the time-division multiplexed signal 12 ', and sends it out to the TIME-SW 6. The TIME-SW control unit 5 sends the broadcast information ATM cell sent from the broadcast cell extraction unit 26 'to the switching information generation unit 33', extracts the broadcast information from the broadcast information ATM cell, and generates the broadcast information from the CLAD4. The switching path of the STM user data 12 'is determined, the switching control section 34' controls the switching of the TIME-SW 6, and the STM user data 12 'sent to the TIME-SW 6 is broadcast to the plurality of terminals 7'. And send it out.

[0031]

According to the present invention, there is provided a data transmitting apparatus and a data transmitting method using an ATM switch as a main switch.
Since the distribution is performed by the TIME-SW after the cell switching of the −SW, the broadcast communication can be performed with an appropriate minimum number of paths such as a single line. As a result, the resources of the ATM-SW can be effectively used, and more voice and data signals other than tones can be transmitted.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of a data transmission device having an ATM switch as a main switch according to the present invention.

FIG. 2 is a circuit block diagram showing a part of FIG. 1 in detail;

FIG. 3 is a circuit block diagram showing details of another part of FIG. 1;

FIG. 4 is a system block diagram showing another embodiment of a data transmission device using an ATM switch as a main switch according to the present invention.

FIG. 5 is a system block diagram showing a known device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 data distribution device 2 data generation device 3 ATM-SW 4 clad 5 TIME-SW controller 6 TIME-SW (STM switch) 7 multiple terminals 8 data (tone) ATM cell 9 broadcast Information ATM cell 12 ... STM data 22 ... Broadcast information generating unit 23 ... Data information generating device 24 ... Header generating device 25 ... Cell assembling unit

Claims (6)

[Claims] 1. A data generating device, a data distribution device, and an ATM-SW provided on a communication line between the data generating device and the data distribution device, wherein the data generating device includes a data ATM cell and a data ATM cell. Broadcast information A
The ATM-SW sets up an appropriate number of paths between the data generation device and the data distribution device based on the headers of the data ATM cell and the broadcast information ATM cell. The ATM-SW performs switching between the data ATM cell and the broadcast information ATM cell to perform the data AT.
Sending the M cell and the broadcast information ATM cell to the data distribution device, the data distribution device switching the data signal of the STM data signal after converting the data ATM cell into an STM data signal based on the header; A data transmission device having, as a main switch, an ATM switch which broadcasts and transmits to a plurality of terminals 7 which have requested data. 2. The data transmitting apparatus according to claim 1, wherein the appropriate number of ATM switches is one as a main switch. 3. The data generation device according to claim 1, wherein the data generation device receives a data request from a plurality of terminals to generate broadcast information, and a data information generation device for generating a data signal. A header generation device for generating a header; a cell assembly unit for assembling a broadcast information ATM cell from the broadcast information and the header; and a cell assembly unit for setting up the data ATM cell from the data signal and the header. A comprising
Data transmission device with TM switch as main switch. 4. The data distribution device according to claim 3, wherein the data ATM cell stores the data ATM cell on the basis of the header.
A TIME-SW for controlling the TIME-SW; and a TIME-SW control unit for controlling the TIME-SW.
A data transmission device in which an ATM switch that performs the switching under the control of an ME-SW control unit is a main switch. 5. A broadcast ATM cell having broadcast information and data A
Generating a TM cell, and combining the broadcast ATM cell and the data ATM cell with an ATM-
An ATM switch for transmitting data to the data distribution device in a single line by the SW, and distributing the data of the data ATM cell by the TIME-SW based on the broadcast information and transmitting the data to a plurality of terminals; Data transmission method. 6. The method of claim 5, further comprising: extracting the broadcast information from a broadcast ATM cell; converting the data ATM cell into STM data; and switching the STM data based on the broadcast information. A data transmission method using an ATM switch as a main switch, which comprises creating information.