JPS62204654A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To contrive the communication between different kinds of facsimile terminal equipments by converting a communication procedure and the picture signal code of a facsimile terminal equipment into those in a communication network. CONSTITUTION:A G3 terminal equipment 1a uses a G3 procedure to send a facsimile signal and a picture signal code to a facsimile terminal interface section 71a. The interface section 71a analyzes the received facsimile signal, converts it into a network protocol, transfers it to an X 25 interface section 72a, sends a picture signal to a picture signal code converting section 73a to send it to a packet network 8. When a G4 terminal equipment 1b receives a picture signal code from the terminal equipment 1a, the X 25 interface section 72b transfers the facsimile signal to the interface section 71b, transfers a picture signal code to a code conversion section 73b, and at the interface section 71b, a signal required for the G4 terminal equipment 1b is constituted and the signal is transferred to the G4 terminal equipment 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile transmission system for connecting facsimile terminals via a packet switching network.

[Conventional technology]

The third IgA is a configuration diagram showing a conventional facsimile communication system when communicating between different types of facsimile terminals.

In Japan, LA is G3 facsimile terminal (hereinafter referred to as Ga
4 terminal), 1b is a G4 facsimile terminal (hereinafter referred to as G
2 is a facsimile communication network that accommodates and interconnects facsimile terminals such as G3 terminal 1a and Q4 terminal 1b to transmit one image data; 3a and 3b are G3 terminals 1* and G4 The subscriber exchange that accommodates selection terminal 1b (
(hereinafter referred to as L8), 4m, and 4b are each LS3m.

The relay switch (hereinafter referred to as T8) which is located above 3b and exchanges communication between each L83a and 3b, 5a and sb is connected to each TS4m and 4b, and performs facsimile communication procedure conversion 9 - signal code conversion 2 screen size We have expanded functions such as conversion, resolution mode conversion, character generation for non-delivery notifications, etc.
Facsimile Int
intelligent community 5y
stern is abbreviated as FIC8), 6 is each FIC8
This is a digital relay line connecting between 5a and 5b.

FIG. 4 is a block diagram showing a facsimile communication system function enhancement system for the facsimile communication system shown in FIG. In the figure, 5 is an FIC 8, and 51 is a storage conversion unit (hereinafter referred to as Storage Co
nversion, Equipment is abbreviated as 5T.
52 is a relay switch for facsimile network (hereinafter referred to as FTS), 53 is 5TOC 51 and FTS 5
2, a facsimile signal conversion control device (
Below, pacsimileSignal Conve
rsion and procedure control
olEquipment is abbreviated as F'CAP).

FIG. 5 is a configuration diagram showing a digital relay network of the facsimile communication method shown in FIG. In fig.

51a, 51b, 51c, 51d are 5TO8, 6a, 6b, 6e, 6 which have inter-office transfer function of digital relay network.
d and 6e are digital trunk lines.

Next, the operation of the conventional facsimile communication system shown in FIG. 3 will be explained. From G3 terminal 1a to G4 terminal 1b
Image transmission to is performed using the following procedure. G3 terminal 1a is G
A call is made to the facsimile communication network 2 using the 4n terminal 1b as the receiving terminal. Within the facsimile communication network 2, LS3a that accommodates the G3 terminal 1a, TSAa connected to LS3a, and each F
TS4b connected to IC85a, 5b, FIC85b
.

A call is connected to the G44 terminal 1b in a single line switching system via the LS3b connected to the TS4b. In addition.

Each FIC 85a and Sb are connected via a digital trunk line 6 by the interoffice relay function of the 5TOC 51.

After the call is set up, image transmission is performed between the G3 terminal 1a and the G4 terminal 1b. FIC8 in facsimile communication network 2
In 5, the FTS52 performs relay switching using the line switching method, the FCAP53 performs facsimile signal procedure conversion, image signal conversion to convert the image signal code transmitted from the facsimile terminal into M H code, and line concentration, and the 5TO851 performs A
5, A4. B4 screen size conversion, 200uiii elements/
It performs character generation functions for inch, 4001 im, inch, VA degree mode conversion, non-delivery notifications, etc., and interoffice transfer of digital relay networks. The digital relay network consists of multiple 5TOCs as shown in FIG.

For example, four 5Ts each 51a, 51b, 51e, 51d
G#6a, 6b in each digital between OC.

5c, 6d+".

As described above, in the facsimile communication system using the conventional facsimile communication network 2, the facsimile signal procedure,
It is possible to transmit images between facsimile terminals with different l1j signal codes, llii surface sizes, and modes, but since these functions are provided by the FIC 85 in the facsimile communication network 2, it is not possible to transmit images unless the facsimile communication network 2 is used. Communication between different types of facsimile terminals is not possible.

[Problem that the invention seeks to solve]

In the facsimile communication method using the conventional facsimile communication network as described above, facsimile signal procedures are necessary for transmission between different types of facsimile terminals.

Since conversion of image signal code 2 screen size, mode, etc. is provided within the facsimile communication network 2, transmission between different types of facsimile terminals is impossible unless the facsimile communication network 2 is used. Namely.

Transmission between different types of facsimile terminals using a communication network other than the facsimile communication network 2, such as a private telephone network or a private data network, is not possible. Therefore, there is a problem in that communication between different types of facsimile terminals in a more economical communication network becomes impossible.

This invention was made to solve this problem, and is intended to solve this problem.

Or by using communication networks used for data communication etc.
An object of the present invention is to obtain a facsimile communication system that enables communication between different types of facsimile terminals.

[Failure to solve the problem]

The facsimile communication system according to the present invention converts the communication procedure one-stroke signal code of the facsimile terminal into a unified communication procedure picture signal code between the facsimile terminal and the communication network. It unified signal codes and enabled communication between different types of facsimile terminals.

[Effect]

In the facsimile communication system of the present invention, the communication procedure/picture signal code converting means communicates with the facsimile terminal using the communication procedure 9-picture signal code of various facsimile terminals, and at the same time converts the communication procedure 2-picture signal code of the facsimile terminal. The communication procedure within the communication network is converted into a two-picture signal code and connected to one communication network, thereby enabling communication between all facsimile terminals connected to this communication network.

〔Example〕

FIG. 1 is a block diagram showing a facsimile communication system according to an embodiment of the present invention. In the figure, 1a is a G3 facsimile terminal (hereinafter referred to as a G3 terminal) that sends documents, and 1b is a G3yi! A G4 facsimile (hereinafter referred to as G4 facsimile) that receives documents sent from
47! 7a is a facsimile 'J code/procedure conversion device d which receives and receives facsimile signals and image signal codes from the G3 terminal 1a and converts them into the protocol of the packet network 8.
(Hereinafter, Facsimile Code and pr
Ocedure ConversionEquipme
nt is abbreviated as FCPC), and 71a is G34.
A facsimile terminal interface unit 72a is a facsimile terminal interface unit that transmits and receives a facsimile signal 2-signal code according to the 03 procedure to and from the facsimile terminal 1a, and generates a unified facsimile IJ signal for the packet network 8.
The facsimile IJ signal transferred from
5 interface sends the image signal code to the packet network 8, 25 interface unit 73a transmits the image signal code transferred from facsimile terminal interface unit 71a to
Convert from code to MH code, X, 25 interface $
72a is an FCPC which receives the facsimile signal and image signal code sent from the packet network 8, and sends the facsimile signal 2-signal code to the G44 end 1b in accordance with the G4 procedure; 71b is X, which will be described later.

A 04 procedure facsimile signal is generated from the facsimile signal transferred from the 25 interface section 72b, and the image signal code and 04 procedure facsimile signal transferred from the image signal code conversion section 73b, which will be described later, are converted into 04 procedure facsimile signal 1b. facsimile terminal interface section 72b for transmitting and receiving between
X transfers the facsimile signal and image signal code received from the packet network 8 to the X and 25 interfaces, respectively, and transfers the facsimile signal to the facsimile terminal interface section 71b and the image signal code to the image signal code conversion section 73b, which will be described later. , 25 interface W, 73 b fly. 25 interface unit 72b, which converts the image signal code transferred from the MH code into the MR''code; 8 is X, a packet network that performs conversion and connection between each FCPC 7a and 7b according to the 25 procedure; 81a is X, 25DCE, 8 read directly by FCP07a on the G3 terminal la side
lb is the X, 250CE connected to the FCPC7bJC on the G4 terminal lb side.

Figure 2 shows G3 in the facsimile communication system shown in Figure 1.
G4 yi from the terminal! FIG. 3 is a diagram showing a sequence when transmitting a document to a terminal. In the figure, T and L in the G4 terminal 1b are CCITT (International Telegraph and Telephone Consultative Committee) T
, transport layer based on Recommendation 60, S, L, session layer based on Recommendation CCITT T, 62,
D, L, CCITT T.

This is a document layer based on the V.62 recommendation. Also, the contents of the transmission and reception indicated by the arrows in Figure 2 are as follows:
ITT T, 30 Recommendation-X-25 procedure is CCITT
X, 25 recommendation, transport layer is CCITT
The session layer and document layer are represented using symbols used in the CCITT T.60 Recommendation, respectively.

Next, the operation of the facsimile communication system shown in FIG. 1, which is an embodiment of the present invention, will be explained. GSm end 1
a transmits the facsimile signal and image signal code to the facsimile terminal interface section 71m of the FCPC 7a according to the G3 procedure.

The facsimile terminal interface section 71a analyzes the facsimile 'J signal received from the G3 terminal 1a, converts it into a line protocol, transfers it to the The encoded image signal is transferred to the image signal code conversion section 73&. The X,25 interface section 72a transmits the facsimile signal transferred from the facsimile terminal interface section 7ta to the X,25 DCE 81a of the packet network 8 in accordance with the X,25 protocol. After the call is established via the packet network 8 in the X, 25 interface section 72a, the picture signal code is converted to
Convert from H-MR code to MH code.

This converted image signal code is transferred to the X, 25 interface section 72&. The X, 25 interface unit 72a transmits the image signal code transferred from the image signal code converter 73a to the packet network 8 as a data packet.

Such a sequence will be explained with reference to FIG. G
34 terminal 1a first sends out a selection signal.

Subsequently, CNG is sent out. Upon receiving the selection signal from the G34 terminal 1a, the FCPCTa selects X and 2 of the packet network 8.
The calling packet CR is sent to the 5DCE 81a. The reception of the call to the G4 terminal 1b via the packet network 8 is confirmed, and when the call completion bucket (CC) arrives from the 25DCE 81a to the FCPCTa, the G3 terminal 1&1CCED is sent from the FCPCTa, and the call is accepted at the G34 terminal 1a. Complete the connection steps. Subsequently, FCPCTa sends DIS to G3 terminal 1a, and in response, G3 terminal 1a returns DO8 to FCPCTa. G3 terminal 1a undergoes primary training (Training) T CF M
After transmitting the image signal code to FCPCTa and establishing synchronization for transmitting the single image signal code, the facsimile image signal code MSG8
Send to FCPC7m. FCPCTa is the received picture signal code I (SG) which is converted into 1 by the picture signal code converter 73m.
The MH-MR code is converted into an MH code, divided into a plurality of data buckets (DT(M)), and sent to the packet network 8. X
, 25DCE81a converts the RR packet into the FCPC for the data packet DT(M) sent from the FCPCTa.
The reception confirmation is sent back to Ta. When the G3 terminal 1a finishes sending the first document and wants to send the second document, it first sends MPS to FCPC 7a, FCPCTa sends With Ga
Return MCF to jll terminal 1&.

After receiving the MCF, G3al terminal 1a sends the image signal code of the second document to FCPCTa, and
converts this code and converts it into multiple data packets DT(M)
The data is divided into X and 25 and sent to the DCI 81a. After completing the document transmission, the G3 terminal 1a sends the gop to FC.
FCPCTa returns MCF and indicates the end of document transmission to 04 end 1b.

The data packet DT (EOP) is sent to the 25DCI 81a. 03 Zuisue 1a after receiving MCF, DCN'E
The data is sent to the FCPC 7m and all operations are completed. F.C.
When PCTa receives DCN, it sends a recovery request packet CQ
-)X, sent to 25DCE81m.

After confirming the cutting of the 04 skin end 1b via the packet network 8.

The recovery confirmation packet CF is received from the X, 25DCE 81a and the operation is completed.

On the other hand, the operation when the G4 terminal 1b receives the image signal code from the G3 terminal 1a will be explained with reference to FIG. 1 again. x, zsl of packet network 8) CE81b to FCPCTb
The facsimile signal 2 packetized in accordance with the X,25 protocol is transmitted to the X,25 interface section 72b. X.

25 interface@72b transfers the received facsimile signal to the facsimile terminal interface section 71b, and also transfers the received image signal code to the image signal code conversion section 73b.
Transfer to. Facsimile terminal interface section 71b
Then, a signal necessary for the G4 terminal 1b is constructed from the received facsimile signal and sent to the G4 terminal 1b.The one-picture signal code conversion section 73b converts the received MH code into an MR code and transfers it to the facsimile terminal interface section 71b. death.

The image signal code received by the facsimile terminal interface section 71b is transferred to the G44 terminal 1b.

Such a sequence will be explained with reference to FIG. When an incoming call packet (ON) arrives at FCPCTb from X, 25DCE 81b of packet network 8, FCPC 7b sends TC to
Send R. T, L, of G4 terminal 1b returns TCR to TCA%FCPC7b, and FCPC7b sends G4
T, L of terminal 1b.

It is assumed that the receiving operation of the G44 terminal 1b is possible by receiving TCA from the terminal 1b, and sends the incoming call (bucket) CA to the X, 25DCE 81b. Next, FCPC7b
GAm4! sends a session start command FC8S to session layers S and L of G4 terminal 1b, and GAm4! end 1b
, L, returns an R85P response and starts the session.

Furthermore, the FCPC7b sends the document start command CDS to the document layers D and L of the end of 0401b.
The start of sending a document is communicated by sending a . When the FCPC7b receives the image signal code (data communication network) DT(M) from the X, 25DCE 81b, it sends an RR packet to the X, 25DCE 81b to acknowledge the reception, and converts the one-image signal code into the MH code. Convert from to MR code.

It is sent to the G4 terminal 1b using the TDT of T and L, the C3UI of S and L, the C3UI of D and L, and the CDUI of D and L. After receiving the first document, FCPC7
1b is X, data packet DT (from 25DCE81b
MPS), it sends the command CDPR indicating the one-ji boundary to the G4 terminal 1b, L. G4
End of November 1 b(7) Once again, the response to D, L, and GICDPH is received and the response RDPBP is sent to the FCPC 7b. The data packet DT (M) of the image signal code of the second document from X, 25DCE81b is sent to FCPC7
When the image signal is transferred to 1b, the FCPC 7b converts the image signal code from MH code to MR code, and converts the image signal code into TDT, L, and TDT of G44 end 1b.

It is transmitted to the 04 shoulder terminal 1b using the CUSI of L, and the CDUI of D, L. The document has been received.

When the FCPC 7b receives the data packet DT (EOP) from the X, 25DCE 81b of the packet network 8, it sends the document end command CDE to the G4 terminal 1b, L, and iζ, and then sends the document end command CDE to the G4 terminal 1b, L, and G4 terminal 1b.

sends a document end response response RDEP to the FCPC 7b. Next, the FCPC 7b terminates the session for S and L of the G4 terminal 1b =r-r7)'
C8E'r sending, G4 terminal 1b (7) S, L.

To receive session termination request from FCPC7b, send command R8.
Send EP. . Next, the FCPC 7b uses the G4 terminal 1b.
The transport layer is disconnected by sending a TCC to T and L of the transport layer. X, 25 When the disconnection instruction bucket) CI is sent to the FCPC 7b from the DCE 81b, + FCPC 7b
After sending TCC to T and L of G44 terminal 1b, it sends disconnection confirmation bucket) CF and terminates the call.

As described above, it is possible to send documents from the G3 terminal 1a to the G44 terminal 1b, and similarly, each FCPC 7a,
7b performs reverse procedure conversion of transmission and reception through the procedure within the packet network 8, and 2-picture signal code conversion, resulting in 11 G4i+1
It also becomes possible to send documents from the G3 terminal 1b to the G3 terminal 1a. By using each FCPC7a, 7b, G
Since communication between the G4 terminal 1a and the G4 terminal 1b is possible without depending on the communication network, a general packet network 8 can be used.

In the above embodiment, the G44 terminal 1b was explained as supporting the transport layer or higher.
4! If the terminal 1b also supports layers below the network layer, connection can be made by adding a function to support layers below the network layer to the facsimile interface section 71b of the FCPC 7b.

Further, in the above embodiment, the case where the packet network 8 is used as one communication network has been described, but each X.

By replacing the 25 interface units 72a and 72b with an interface of another communication network, for example, a telephone communication network, another communication network may be used, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, the present invention has a structure in which a facsimile communication method is unified within one communication network by using communication procedures and image signal code conversion means between the facsimile terminal and the communication network. This has an excellent effect in that it is possible to communicate between different types of facsimile terminals using a voice communication network or a data communication network without relying on a dedicated facsimile communication network.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a facsimile communication system according to an embodiment of the present invention, and FIG. 2 is a diagram showing a sequence when a document is sent from a Ga4 terminal to a 04 terminal in the facsimile communication system of FIG. 1. FIG. 3 is a configuration diagram showing a conventional facsimile communication system for communicating between different types of facsimile terminals. FIG. 4 is a configuration diagram showing a facsimile communication system function enhancement system for the facsimile communication system shown in FIG. FIG. 5 is a configuration diagram showing a digital relay network of the facsimile communication method shown in FIG. In the figure, la...G3 facsimile terminal, 1b...
...G4 facsimile terminal, 2...Facsimile communication network, 3a, 3b...Subscriber exchange, 4a, 4b...
Relay switch, s, sa, sb...Facsimile communication system function expansion system, 51, 51a to 51d...Storage and conversion unit, 52...Facsimile IJ network relay switch. 53...Facsimile signal conversion control device, 6, 6a~
6e...Digital trunk line, 7a, 7b...Facsimile code/procedure conversion device 1.71a, 71b...Facsimile terminal interface section, 72a, 72b-X
, 25 interface section, 73a, 73b... image signal code conversion section, 8... packet network, 81a, 81b...
・X, 25DCE. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A facsimile terminal for analog lines connected to a line-switched network, which is connected to this facsimile terminal, receives image data using the communication procedure of the facsimile terminal, and uses facsimile communication rules unified within the communication network. transmitting the image data received from the facsimile terminal to the communication network, or receiving the image data using a communication procedure unified within the communication network, and transmitting the image data received from the communication network to the facsimile terminal. 1. A facsimile communication system comprising: a communication procedure/image signal code conversion means capable of transmitting to said facsimile terminal using a communication procedure possessed by said facsimile terminal.