KR920001183B1 - Rtc checking method for multi fax communitcation - Google Patents

Abstract

The method carries out an RTC check by detecting RTC from among the signals of a MODEM. The method includes the steps of: checking an RTC checking flag; receiving data by using DMA to carry out RTC-checking; checking the existence or absence of a FED signal after the set-up of the RTC flag; checking the existence or absence of a CDET signal upon detecting an FED signal; and setting the MODEM to a receiving mode upon detecting the CDET signal, and returning the operation upon detecting none of CDET signal or non-setting of the flag.

Description

RTC check method for multi-fax communication

1 is a system diagram applied to the present invention.

2 is a concrete block diagram of the FIU 11 of FIG.

3 is an operational waveform diagram according to the present invention.

4 is a memory map diagram of the interface of the modem 22 of FIG. 2 according to the present invention.

5 is a flow chart in accordance with the present invention.

The present invention relates to a RTC (Retrun To Control) (= EOL * 6) checking method for receiving one page of data in a FAX communication. In particular, a signal generated in a modem without coding and decoding data transmitted / received during FAX transmission and reception is provided. The present invention relates to an RTC checking method for multiple fax communication that detects an RTC from the network and enables multiple fax communication.

The system for the FAX communication configured as shown in FIG. 1 can be seen in the patent application No. 87-15548 filed by the same application as a device for a mailbox connection.

It is connected to the facsimile 101 which is connected to the exchange 103 via a plurality of facsimile 101 and the telephone 102, the exchange 103 and the MCP 8 and the telephone 102 that control the entire system. The MCP detects a FIU 11 that processes a function of receiving a service request in units of blocks from the block 101 or transmits service contents to the facsimile 105, and various status signals generated therein and various signals notified from the outside. (8) Enlarging / Reducing or Encoding / Decoding the Image Data Transmitted / Received Through the FCP 10 and the FIU 11 That Facilitates Data Transmission Between the FIU 11 and the Output to the FAX Terminal In order to store the data of the facsimile 101 upon receiving, it is provided with an ICP 12, a mailbox storage hard disk 104, and a hard disk backup floppy disk 105, which perform a function of converting a code into an image. It consists of a PC (105) for outputting the stored data synthesizer.

2 is a detailed block diagram of the FIU 11 of FIG. First, the FIU 11 and the FCP 10 will be described before the overall system description. As shown in FIG. 2, the NCU 23 is a device that is properly connected to the PABX 103 to control the connection to various devices in the FIU 11. When a ring comes in from the phone 102, a ring detector in the NCU 23 detects the ring and notifies the CPU 14 directly, and the CPU 14 notifies the MCP 8 that the ring has arrived. It then sends a command to the NCU 23 to connect the data bus. At this time, when a voice outputting a signal from the MCP 8 to receive push button data is output, the CPU 14 outputs the corresponding data of the EPROM 18 to the user through the CODEC 21. When the user hears the voice and transmits the PB data (combination of 0-9, #, *) to the DTMF 20 using the push button (PB) of the phone 102, the DTMF 20 is analog. The data is converted to digital, interrupted by the INTC 16, and the PB data is written to the designated buffer in the RAM 19. The data is transferred to the FIFO 17 via the DMAC 15, and transmitted to the MCP 8. When the corresponding output and PB data reception is repeated and all PB data reception is completed, the terminal finally hooks on and outputs a voice to press the communication button of the facsimile 101.

Thereafter, T. 30 protocol communication is performed between the facsimile modem and the MODEM 22 in the FIU 11. The protocol information sent and received is the type of the facsimile, the line speed, and the vehicle mode. When such a rule is established, the actual facsimile image data is transmitted to the FCP 10 using the MODEM 22 and the DMAC 15. Receives the message information of the MCP (8) is transmitted to the PCP 13 and block units. When the transmission is over, the data is cut by the other fax. When the data is sent by the other fax, the free line is found and connected. The data is sent by the other fax by the block unit. When the transmission is completed, the line is disconnected and the transmission is completed. .

The purpose of the FCP 10 shown in FIG. 3 is as an interface between the FIU 11 and the MCP 8 to convey a communication message from the FIU 11 to the MCP 8 and to send the FIU (from the MCP 8). Send communication message to 11). First, upon reception, image data is received from the FIU 11 and written to the hard disk 104 or floppy disk 105 of the PCP 13 according to the MCP 8 instructions, and at the time of transmission, message information of the MCP 8 is transmitted. In this manner, the PCP 13 transmits information in units of blocks from the PCP 13 to the FIU 11.

In addition, in consideration of scalability, it is possible to connect several FIUs 11 to one FCP 10. The FCP 10 performs an interface function with the PCP 13 during transmission and reception, and the expansion of the FIU 11 is easy.

The operation of the present invention will be described with reference to FIG. When the user hooks off the handset of the telephone 102 to transmit the facsimile data, the PABX 103 sends a ring tone to the CPU 14 and outputs a ring backtone to the user.

The CPU 14 detects an on-line physical line and sends a communication message to the FCP 10 through the FIFO 17. The FCP 10 sends the MPC 26 to the MCP 8; Send a communication message through. At this time, the MCP 8 analyzes the communication message, detects the call notification that the ring is coming, and transmits the communication message via the FCP 10 to the FIU 11 for receiving control data. The FIU 11 connects the data bus when the NCU 23 detects the ring tone, and the CPU 14 analyzes the communication message.

Since the message has a command for outputting the control data, the corresponding data of the FPROM 18 is sent out to the user's telephone 102 through the CODEC 21, where the user outputs the telephone as instructed by the output voice. 102 inputs a character string that is a combination of (0-9, *, #) via push button PB.

The DTMF 20 inputting the PB data converts the input analog signal into a digital signal, stores it in the RAM 19, transfers it to the MCP 8 through the FIFO 17 by the DMAC 15, and the MCP 8. Instructs voice output until the control data is all received and repeats the control data. By the above operation, the MCP 8 sends a notification of completion of signal output and PB data reception. At this time, when the user puts the telephone according to the output of the last signal and presses the communication button of FAX, the telephone line is disconnected from this time, and the line of the facsimile is connected to communicate between the facsimile 101 and the FIU 11. The modem of the user facsimile performs the T.30 protocol with the MODEM 22 in the FIU 11, and the work to be done at this time is to determine the type of the facsimile, the line speed, and the setting of the normal fine mode.

After the progression, the MCP 8 receives the data in units of blocks (8K) from the FIU 11 with an instruction to send the facsimile image data to the FIU 11. When the reception of the image data is completed by using the function of, the service of the application S / W 7 in the MCP 8 is received.

As described above, the CPU 14 decodes the digital data from the digitalized data in the modem 22 of the FIU 11 to check the last line of one page of received image data. * 6) will be checked.

In the conventional RTC detection method, since the RTC is detected from the scanned and processed data after scanning the coding data of each line unit during the actual decoding, it is inevitably required to code and decode, which takes a lot of time. Therefore, when FAX is connected multiplely as shown in FIG. 1, it is difficult to process a lot of data in order to detect RTC by decoding entire data one by one in order to detect RTC in FIU 11.

It is therefore an object of the present invention to provide a method for detecting RTC without coding and decoding of image data.

Another object of the present invention is to perform a RTC checking for receiving one-page data required for FAX communication without coding and decoding, thereby reducing the time required for this, and providing a method for reducing the time load generated during multi-line processing. Is in.

(Carrier Dector)신호 파형도로서, 이신호 역시 통과대역 에너지를 감지하기 위한 것으로 데이타가 있는 시작상태에서 “로우”로 가고, 끝상태에서 “하이”로 간다. 이 신호는 1보우(Baud)시간동안 액티브되어 있으며, 상기 보우시간내에서 디엑티브되는 신호이다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 3 is a waveform diagram generated when data is received by the modem 22 of FIG. 2 according to the present invention. FIG. 3a is a one page image data waveform, and FIG. 3b is a modem when receiving one page image data of FIG. Figure 22 is a waveform diagram of the FED (Fast Energy Detect) signal generated in hardware, which indicates the level of the received signal, where the state of low (D) means that the passband energy is present from the start of reception. do. FIG. 3C shows hardware generated by the modem 22 upon receiving the first page data of FIG. 3A.

(Carrier Dector) This is a waveform diagram of a signal, which is also used to sense passband energy. It goes from the beginning of data to "low" and from the end to "high". This signal is active for one bow time and deactivated within the bow time.

4 is an interface memory map diagram of the modem 22 according to the present invention.

신호 유무를 체킹하는 제2단계와, 상기 제2단계에서

신호가 있을때

신호 유무를 체킹하는 제3단계와, 상기 제3단계에서

가 있을때 모뎀(22)을 T·30코멘드 수신모드로 세팅하고 상기 제1-3단계에서 RTC체크 플랙이 세팅이 안되었거나

,

신호가 없을때 리턴되는 제4단계로 이루어진다.FIG. 5 is a flowchart according to the present invention. FIG. 5A is a data receiving flowchart. The first step of checking the flag for RTC checking is set. In the second step of performing the checking of the RTC of FIG. FIG. 5b is a flowchart specifically illustrating RTC checking in the second process, wherein a first step of checking whether or not to set an RTC checking flag is set, and when the RTC checking flag is set in the first step.

In the second step of checking the presence of the signal, in the second step

When there is a signal

In a third step of checking the presence of a signal, in the third step

Is set, the modem 22 is set to the T / 30 command receiving mode and the RTC check flag is not set in steps 1-3.

,

The fourth step is to return when there is no signal.

Therefore, the specific embodiment of the present invention will be described in detail with reference to FIGS. 1-5. The present invention finds the RTC indicating the end of page 1 when the FAX transmission and reception are not decoded, and stops receiving image data. Enter a state that receives a command for 30 protocols. For this purpose, the RTC is detected by checking the FED and CDET signals by using the modem 22 of FIG. 2 and a 10 ms timer in the CPU 14 that checks it by polling every 10 ms.

As shown in FIG. 1, the image signal to be transmitted in the multiplexed FAX1-FAXn is digitized. However, when the data to be transmitted is coded in FAX, RTC (EOL) is added and coded simultaneously so that one page of data is distinguished at the end for every one page of data.

The RTC is sensed by an electronic circuit and a mechanical device at the end of one page of a document in FAX and added to the coding transmission data. The data coded with the digital data is received via the private exchange 103 to the modem 22 in accordance with the switching of the NCU 11 of the FIU 11 and executed according to the flowchart of FIG.

In the modem 22, the coded data is mapped by the control program of the CPU 14 to the modem 22 interface memory as shown in Fig. 4, and the CPU 14 moves to a predetermined area on the RAM 19 in Fig. 5A. Set the RTC check flag. In the process of FIG. 5B, the CPU 14 controls the DMAC 15 so that the DMAC 15 receives the control right from the CPU 14 and directly controls the RAM 19. FIG. Therefore, the received coding data output through the MODEM 22 by the control of the DMAC 15 is stored in the RAM 19. The CPU 14 executes the RTC checking routine of FIG. 5B by using the CPU 14 for coding data of the received RAM 19.

To this end, the CPU 14 checks whether the RTC check flag is set in the process of FIG. 5C.

신호 유무를 체킹한다.If the RTC check flag is set in FIG. 5C, the same as the 3D wave form of FIG. 3B in FIG. 5D is mapped onto the interface memory of the modem 22 of FIG.

Check for signal presence.

신호가 있을때 제5e도과정에서 제3c도의 파형과 같이 제4도의 모뎀(22)의 인터페이스 메모리상에 맵핑되었던

신호 유무를 체킹한다.In the process of FIG. 5d

When the signal is present, it is mapped on the interface memory of the modem 22 of FIG. 4 as shown in FIG.

Check for signal presence.

신호가 있을때 제5f도과정에서 CPU(14)는 모뎀(22)을 T·30코멘드 수신모드로 세팅한다. 그러나 상기 제5c도-제5e도과정에서 세팅한다. RTC체크 플랙이 세팅안되었거나

,

신호가 없을때 메인 프로그램으로 리턴된다. 즉, 제3도에서 도시한 바와같이 제3b도, 제3c도의

와

신호는 데이타 상태의 마지막 단계에서 “하이”로 가게된다. 이것을 10ms 타임처리 인터럽트 처리 루틴에서 폴링으로 계속적으로 상태를 체크한다.In the process of Figure 5c

When there is a signal, the CPU 14 sets the modem 22 to the T-30 command reception mode in the process of FIG. 5F. However, it is set in FIGS. 5C to 5E. RTC check flag is not set

,

When there is no signal, it returns to the main program. That is, as shown in FIG. 3, FIG. 3B and FIG.

Wow

The signal goes “high” at the end of the data state. This is constantly checked by polling the 10ms timed interrupt handling routine.

However, if time processing more than 10ms delays a lot of time, signal may be lost, so it should be initialized to less than 10ms. Therefore, when the FED and CDET signals go to "high", the modem 22 is set up with the command reception state of T.30 to go to the phase D stage.

This completes the reception of the page and enables FAX interfacing without decoding.

As described above, it is possible to process without the decoding logic by finding the end of one page by checking the signal output from the modem, and thus it is possible to reduce the time burden caused by the multi-line processing, thereby enabling the multiple line fax communication. .

Claims (1)

In the RTC detection method of facsimile communication, a first step of checking the RTC check flag and a first step of setting the RTC check flag, receiving data using DMA, and performing RTC checking in a data receiving state. Step 2 and a third step of checking whether or not to set the RTC check flag, and when the RTC check flag is set in the third step

In a fourth process of checking for the presence of a signal, and in the fourth process

When there is a signal

In a fifth process of checking for the presence of a signal, and in the fifth process

When the modem is set to T.30 command receiving mode and the RTC check flag is not set in step 3-5,

,

RTC check method for multiple fax communication, characterized in that the sixth process is returned when there is no signal.

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