JPH06105115A - Facsimile data transmission system - Google Patents

Abstract

PURPOSE:To decrease a transmission rate by generating a facsimile transmission part cell as soon as the transmission start of facsimile data is detected, sending the cell, and confirming a reply cell from a reception side so as to allocate a transmission band. CONSTITUTION:Voice data from a telephone set 4a at a sender side are composed into ATM cells by an asynchronous transfer mode(ATM) composition section 5 in a sender side transmitter 1 and the cells are sent to a reception side transmitter 2. The transmitter 2 receives the ATM cells, an ATM cell decomposition section 6 decomposes them into voice data, which are received by a telephone set 4b. When a sender side FAX 3a starts the transmission of FAX data, a FAX signal detection section 7 generates FAX transmission starting cell including information such as a band and a speed and sends the cell. Upon the receipt of the reply cell from the transmitter 2, the transmitter 1 uses a multiplexer section 8 to allocate a fixed band and starts the transmission of FAX data. Thus, the transmission of a redundant part such as an ATM header and a trailer is not required and the transmission quantity is compressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile data transmission system using an asynchronous transfer mode system.

[0002]

2. Description of the Related Art A conventional example will be described below with reference to FIG. FIG. 4 is a diagram showing a circuit configuration of a conventional example, and shows a transmission apparatus using an asynchronous transfer mode (ATM) system.

In FIG. 4, reference numeral 1 is a transmitting side transmission device having an ATM cell assembling section 5. Reference numeral 2 is a receiving side transmission device including an ATM cell disassembling unit 6. 3a, 4a
Are a facsimile (FAX) which is a terminal on the transmitting side and a telephone. Further, 3b and 4b are a FAX and a telephone which are terminals on the receiving side.

As shown in FIG. 4, the transmission data of images and voices output from the FAX 3a and the telephone 4a on the transmitting side is transmitted to the AT in the ATM cell assembling unit 5 in the transmitting apparatus 1 on the transmitting side.
It is assembled in the form of M cells and sent to the receiving side transmission device 2 via the line.

The receiving-side transmission device 2 receives the ATM cell sent from the transmitting-side transmission device 1, and the ATM cell disassembling unit 6
Then, the ATM cell is decomposed into FAX data and voice data,
The FAX data is sent to the FAX 3b and the voice data is sent to the telephone 4b to receive them.

[0006] In the ATM type transmission apparatus, the type of data (terminal, image, voice, facsimile (FA
X) etc.), all called ATM cells 53
It is stipulated in the international convention (CCITT convention) that data is transmitted in byte data units.

[0007] In this transmission by the ATM system, transmission / reception is carried out using ATM cells each having a data unit of 53 bytes regardless of the speed of the data to be transmitted or the type of medium, and the data is valid (for example, if there is voice, there is a sound. By transmitting only the part) and not the invalid part (silent part),
It aims to reduce the overall transmission rate.

However, since there is almost no invalid portion for FAX data, when ATM cells are formed, A
The transmission rate is increased by the amount of control information called TM header and trailer added, and the merit of the ATM system cannot be utilized.

[0009]

Therefore, when transmitting FAX data by the ATM method, there is a problem that the transmission rate does not decrease, but rather increases.

It is an object of the present invention to perform fixed band allocation of FAX data by generating a FAX transmission start cell to reduce the transmission rate.

[0011]

In order to achieve the above object, a transmitting side transmission apparatus having an ATM cell assembling unit for converting voice data into ATM cells and transmitting the ATM cells to a line, and an ATM cell from the line to voice data In an asynchronous transfer mode communication system comprising a receiving side transmission device having an ATM cell disassembling unit for converting into a, the transmission side transmission device detects the start of transmission of facsimile data, outputs a facsimile transmission start cell, and A FAX signal detection unit for confirming the facsimile transmission start response cell returned from the receiving side transmission device and transmitting the facsimile data, and a multiplexing unit for allocating the bandwidth of the facsimile data and the ATM cell and transmitting it on the line. In addition, it is possible to confirm the facsimile transmission start cell sent via the line in the receiving side transmission device. The return facsimile transmission start response cell, and constitutes a band allocation data sent from the multiplexing unit to provide a facsimile data decomposing separation unit into ATM cells.

[0012]

According to the present invention, in the FAX signal detecting section, the FAX
At the same time when the start of data transmission is detected, a FAX transmission start cell is generated and transmitted to the line, and when the reception side receives the FAX transmission start cell, the separation unit performs F
Preparations for separating the AX data are made, and the FAX transmission start response cell is returned to the transmission side.

Therefore, the transmitting side confirms the FAX transmission start response cell and performs the band allocation, whereby the band-allocated facsimile data can be transmitted.

[0014]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a diagram showing a configuration of an embodiment circuit of the present invention, and FIG. 2 is a diagram showing a transmission start / end sequence of the present invention. FIG. 3 is a diagram showing fixed band allocation of the present invention.

In FIG. 1, reference numeral 1 is a transmission side transmission apparatus including an ATM cell assembling section 5, a FAX signal detecting section 7 and a multiplexing section 8, and 2 is a reception side transmission apparatus including an ATM cell disassembling section 6 and a separating section 9. Is.

Further, 3a and 4a are a FAX and a telephone which are terminals on the transmitting side, and 3b and 4b are FA which are terminals on the receiving side.
X and a phone. Note that, when FIG. 1 is compared with FIG. 4, the same symbols indicate the same configurations as those of the conventional example.

1 to 3, for example, when only voice is transmitted, the voice data output from the telephone 4a on the transmitting side is AT in the transmitting device 1 on the transmitting side, as in FIG.
As shown in FIG. 3A, the M cell assembling unit 5 assembles the ATM cells into a form, and sends the ATM cells to the receiving side transmission apparatus 2 via a line.

The receiving side transmission device 2 receives the ATM cell sent from the transmitting side transmission device 1, and the ATM cell disassembling unit 6
At, the received data is decomposed into voice data, and the voice data is received by the telephone 4b.

Further, when the transmitting side FAX 3a starts transmission of FAX data, the FAX signal detecting section 7 detects the start of transmission and generates a FAX transmission start cell, and sends out the FAX transmission start cell via the line.

On the other hand, the separation unit 9 of the receiving side transmission device 2 receives the FAX transmission start cell, extracts the information such as the band and speed contained in the FAX transmission start cell, and the data for which the fixed band allocation is performed. Prepare to receive
The FAX transmission start response cell is returned.

When the FAX transmission start response cell is received by the transmission side transmission apparatus 1, the multiplexing unit 8 transmits the ATM cell from the ATM cell assembling unit 5 and the FAX data from the FAX signal detecting unit 7. Band fixed allocation is performed as shown in FIG. 3 (B), and FAX data transmission is started via the line.

The transmission device 2 on the receiving side receives the FAX data sent via the line, and the separating unit 9 decomposes the received data into FAX data and ATM cells. And
FAX data is sent to FAX3b and received, and A
The ATM cell is decomposed into voice by the ATM cell disassembling unit 6 and the telephone is called.
It is sent to 4b and received.

In this case, since the data is fixedly allocated in the FAX signal detecting section 7, it is not necessary to add control information like an ATM cell, and the transmission rate can be lowered. Further, when the transmitting side FAX 3a finishes transmitting the data, the FAX signal detecting section 7 generates a FAX transmitting end cell and outputs it to the line, and releases the fixed allocation of the band.

The separation unit 9 of the transmission device 2 on the receiving side uses the FAX.
When the transmission end cell is received, the fixed allocation of the band is released and the state before the FAX transmission is returned.

[0025]

As is apparent from the above description, according to the present invention, it is possible to prevent the redundant portion such as the ATM header / trailer from being transmitted at the time of transmitting the FAX data, so that the total transmission is performed. Since the amount of data can be compressed, it has an effect that it greatly contributes to the effective use of the line.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment circuit of the present invention.

FIG. 2 is a diagram showing a transmission start / end sequence of the present invention.

FIG. 3 is a diagram showing fixed band allocation of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional example circuit.

[Explanation of symbols]

 1 transmitter on the transmitting side 2 transmitter on the receiving side 3a, 3b FAX 4a, 4b telephone 5 ATM cell assembling unit 6 ATM cell disassembling unit 7 FAX signal detecting unit 8 multiplexing unit 9 separating unit

Claims (1)

[Claims] 1. A transmission device (1) having an ATM cell assembling unit (5) for converting voice data into ATM cells and transmitting the ATM cells to a line, and an ATM cell disassembly for converting ATM cells from the line into voice data. In the asynchronous transfer mode communication system consisting of the receiving side transmitting device (2) having the section (6), the transmitting side transmitting device (1) detects the start of facsimile data transmission and outputs a facsimile transmission start cell. In addition, the FAX signal detection unit (7) that confirms the facsimile transmission start response cell returned from the receiving side transmission device (2) and transmits the facsimile data, and performs the band allocation of the facsimile data and the ATM cell. A multiplexing unit (8) for sending on the line is provided, and a facsimile transmission start cell sent via the line is confirmed in the receiving side transmission device (2) to confirm the facsimile transmission start cell. Facsimile data transmission system characterized in that it further comprises a separating section (9) for returning the transmission start response cell and for dividing the band allocation data sent from the multiplexing section (8) into facsimile data and ATM cells. .