KR940010467B1 - Fax for isdn - Google Patents

Abstract

The method interfaces a facsimile connecting unit with a communication network, which enables ISDN and CSDN to be used simultaneously. The method consists of an ISDN line interfacing unit, a CSDN interfacing unit which communicates image data with other person by sending other person's telephone number through SDSU, an ISDN controller which controls a signal channel, D channel, exchanges a line coding with a primitive message, and communicates them, and a series I/O unit which separates a data channel from the CSDN line interfacing unit and ISDN controller and transmits image data in series.

Description

Comprehensive Information Networks, Circuit-switched Communication Networks and Connection Circuits and Methods in Faxes

1 is a conventional circuit diagram.

2 is a block diagram according to the present invention.

3 is a detailed circuit diagram of FIG.

The present invention relates to a method of connecting a facsimile terminal connection unit and a communication network in facsimile communication. Particularly, a facsimile terminal device is connected to a circuit switched communication network (CSDN) or an integrated information communication network (ISDN) from a public line switching network (PSTN). The present invention relates to a facsimile communication network access method and circuit that can be used simultaneously for ISDN or CSDN in the existing PSTN.

As shown in FIG. 1, the G3 facsimile configuration diagram used for facsimile communication using an existing public line switching network (PSTN) includes a scan unit 101 for reading image data and a print unit 104 for outputting received image data. ), A memory unit 102 for storing image data and programs, a modem unit 111 for coding and decoding data transmitted and received, and a PSTN line interface unit for connecting the modulated image data to a public line switching network (PSTN). 112 and the MPU 103 for controlling the respective parts.

The signal flow in FIG. 1 is as follows. The image data scanned through the scanning unit 101 is input to the modem unit 111 under the control of the MPU 103, and is converted into an analog coded (MH, MR) signal for conforming to the public circuit switched network protocol, and then the PSTN line interface. The unit 112 transmits the signal to the network through signal level adjustment and filtering. On the other hand, the image data transmitted from another facsimile is input to the buffer in the modem unit 111 through signal level adjustment and line filtering through the PSTN line interface unit 112 via a network, and then decoded into digital image data [MH ^{− 1} , (MR) ^-1 ], stored in the memory section 102, and then outputting image data to the print section 104 under the control of the MPU 103 section.

However, in the related art, the analog communication method for accessing the public line switching network to perform facsimile communication has been impossible in a general information communication network and a circuit switched communication network.

Accordingly, an object of the present invention is to provide a method and a circuit for connecting a G4 facsimile communication network that allows a circuit-switched network and a comprehensive information communication network to be used simultaneously and sequentially by changing a network connection to a G3 facsimile using a public line switched network.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram according to the present invention, in which the configuration except for the dotted line portion (terminal connection unit 100) of FIG. 2 is the same as that of the first diagram, and the ISDN line interface unit 13 for interfacing the integrated information network line; Connected to the exchange data service unit (SDSU) 107, the other party's telephone number for determining the location of the other party is sent to the line through the exchange data service unit, and the line is connected to the other party through an interlocking operation with the exchange to establish an image through a predetermined channel. CSDN interface unit 14 which communicates data with the other party, and ISDN line interface unit 13 are connected to control the D channel which is a signal channel, perform line coding of layer 1 and 2 and primitive message exchange, and perform the line coding. An ISDN controller 12 for communicating the frame data, and the CSDN line for the service of the integrated information network and the circuit-switched communication network. It is connected to the interface unit 15 and the ISDN controller 12 is configured to separate the image data for the channel to the serial input-output unit 11 to transmit in series.

3 is a detailed circuit diagram of FIG. 2, wherein the upper and lower serial input / output unit 11, the ISDN controller 12, and the ISDN interface unit 13 are the same as the patent applications Nos. 91-4488 and previously filed by the same applicant of the present patent. Note that it is described in detail in 91-11639. The communication service method is the same as the contents of the application (91-4488, 11693).

The present invention is to facilitate the application to the circuit switching network as well as the above function, and connects the RS.366A connector (CE2) of the SDSU 107, and connects the V.35 connector (CE1) to the V.35 bus A buffer BF2 is connected to the MPU 103 for the call data transmission from the RS.366A connector CE2, and a buffer BF1 is used for the call data transfer from the MPU 103 to the SDSU 107. ), The inverters N1-N5 are connected between the buffer BF2 from the V.35 connector CE2 connected to the RS266A bus, and a NAND gate between the V35 connector CE2 and the buffer BF1. Link (NA1-NA6). The PXDB, TXDB, RTSB, CTSB, RXDLKB, AXCLKB, and TXCLKB are connected to the second channel SIO (IC2) for the circuit switched network service of the V34 connector CE1, but are connected through a buffer and a driver.

Therefore, for facsimile service, a call signal is transmitted through the buffers BF1 and BF2 for FAX transmission. When a line is connected according to the call, image data is transmitted through the V35 bus.

One embodiment of the present invention will be described in detail with reference to Figs. 1 to 3, wherein the MPU 103 controls the entire facsimile system, and performs system initialization and processing interrupt requests of each I / O device. It plays a role, mainly the central processing unit. It is composed of other interrupt circuits and I / O device control circuits. The memory unit 102 includes a system initialization program and a system operation program. The memory unit 102 is composed of an EP-ROM and a DRAM. The EP-ROM is a program storage memory, and the DRAM stores image data to be communicated with. The scanning unit 101 is an input unit for reading image data of a document to be copied or communicated, and the scanned image data has a resolution of 200 dots / inch, 400 dots / inch, and the like. Consists of

The printer unit 104 outputs image data stored in the memory 102 or data for converting the scanned image data by the pixel conversion unit 106. Here, the TPH (thermal recording element) or LBP (laser printer) or the like is used. use. The pixel converter 106 converts the resolution of the scanned image data into a predetermined resolution, and converts, reduces, and enlarges the predetermined resolution of the data to a predetermined resolution. The terminal connection unit 100 has a different operation process depending on the integrated communication network (ISDN) or the circuit switched communication network (CSDN) used by the facsimile system. First, a case in which the integrated information communication network is used is as follows.

Due to the characteristics of the communication line, the facsimile system line connection part is composed of a serial input / output circuit 11, which is a B channel control part, which is a data channel, a D channel control part ISDN controller 12, which is a signal channel, and an ISDN line interface part 11 which is directly connected to the line. Facsimile communication will be performed. The operation signal flow is the line coded line control data coming into the ISDN line interface unit 110 to form a physical layer line connection through an interlocking operation with the ISDN exchange, and the position of the point to be communicated in the D channel unit after being connected to the exchange. Through the linkage operation with the signal data to designate the exchange, the location of the other party is known. Therefore, after recognizing the location of the other party, the B channel control unit, which is a data channel, converts the image data to be communicated into a frame structure and then communicates with the other party via a line. The following circuit switched network is used.

The switched data service unit (SDSU) 107, which is a line connection part, is directly connected to the line according to the characteristics of the communication network, performs line coding of data to be communicated with the line, and a peripheral for controlling the MPU 103 of the SDSU 107. The CSDN line interface unit 13, which contains a circuit, also serves to connect the image data to be sent to the line in the B channel unit, which is a data channel, with the SDSU 107. The operation signal flow is sent to the line through the SDSU 107 to the other party's telephone number for determining the other party's position by the control of the MPU 103, and connected to the line through the interlocking operation with the exchange, the B channel control unit to communicate Send data to communicate with the other party.

In order to use the circuit switched communication network, the CSDN line interface unit 14 uses the RS366A bus for communication with the SDSU 107, the V35 bus for the B channel unit, and the MPU 103 uses the SDSU 107. In order to control the I / O port of the various MPU 103 is configured. Moreover, the circuit for connecting with a B channel part is comprised. The B channel controller is constituted by a circuit for controlling the MPU 103. In order to use the integrated information communication network, the ISDN line interface unit 13 is composed of peripheral circuits for impedance matching purpose of sending line-coded line data to the exchanger well, and MPU 103 and SDSU 107 for facsimile data transmission. Facsimile transmission is performed for communication according to the call.When transmitting information for call connection from the MPU 103 to the SDSU 107, the buffer BF1 is enabled through the oragate OR1 to enable the address bus. Buffer the data through the NAND gate (NA1-NA6) through the RS366A bus to the SDSU 107, and when reading data from the SDSU 107 through the oragate (OR2) through the buffer (BF2) The enabled information read from the SDSU 107 is inverted in the inverters N1-N5 through the RS366 connector CE2 and then buffered in the buffer BF2 and transferred to the MPU 103. Thus, when the line connection is completed, the facsimile image data is transferred from the SDSU 107 through the SIO IC2.

As described above, facsimile communication is possible regardless of whether the line is a comprehensive telecommunication network or a circuit switched network, and it improves excessive transmission error and transmission time, which is a weak point of the existing public line switched network, It can be used, and there is an advantage that the facsimile function can be implemented by changing the line connection in the existing facsimile diagram.

Claims (4)

A circuit switched telecommunication network (CSDN) connection circuit having a facsimile central processing unit (MPU) to connect an integrated data communications network (ISDN) and a switched data service unit, comprising: an ISDN line interfacing unit for interfacing the integrated telecommunication network lines; The other party's telephone number to be connected to the exchange data service unit (SDSU) is sent to the line through the exchange data service unit (SDSU) to connect the line with the other through interlocking operation with the exchange. A DSDN interface for communicating with the other party, an ISDN controller connected to the ISDN line interface for controlling a D channel, a signal channel, performing line coding and primitive message exchange, and communicating line coded frame data, and the integrated information communication network. CSDN for service of network and circuit switched networks An integrated information network and circuit switched network connection circuit in a facsimile machine comprising a serial input / output unit connected to a line interface unit and an ISDN controller to separate data channels to be used and to transmit image data in series. The CPU of claim 1, wherein the CSDN interface unit connects the address bus of the CPU to the buffer and controls the buffer by a chip selector signal for input / output and the write control terminal WR of the CPU. Enable to buffer the input address signal, connect it to an RS-366 bus for transmission to an exchange data service unit (SDSU), and chip selector of the central processing unit (MPU) to buffer data on the RS-366 bus. Signal and lead control stage And a buffer means for buffering the FAX data on the V35 from the switched data service unit (SDSU). 3. The integrated information communication network and circuit-switched connection circuit according to claim 2, further comprising means for inverting input and output signals at the input and output ends of the RS-366 bus and the buffer. A method of connecting a circuit switched telecommunication network (CSDN) for connecting an integrated data communications network (ISDN) or a data service unit using a fax central processing unit (MPU), wherein the signal transmission between the integrated telecommunication network and the circuit switched telecommunication network is performed. The data channel is separated and line interfaced to facilitate signal transmission through the channel for the integrated information network, and the signal channel controls the D channel, and exchanges the line coded frame data by exchanging messages for line coding and primitives. And a line interfaced to facilitate signal transmission through a channel for the circuit switched communication network so as to communicate image data with a counterpart through a connection channel according to a call of a subscriber. .