JPS58139544A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To improve the efficiency of a communication circuit, by giving a switch control to the transfer speed to a multiplexed device from a terminal on the basis of the number of working terminals and the communicable speed of terminals. CONSTITUTION:The communication is carried out between a terminal 1 and a terminal 4. In this case, the circuit is occupied between the terminals 1 and 4. Under such conditions, a request is given for communication between terminals 2 and 5. In such a case, a request for connection of communication is given to a multiplexed device 12 from the terminal 2. The device 12 receives the request from the terminal 2 and at the same time transmits the timing for transmission of information with a delay to the terminal 1. The information to be transmitted to a transmission line 14 contains the information transmitted between terminals 1 and 4 as well as the information transmitted between terminals 2 and 5. Furthermore, the communication speed between terminals of one side is doubled when the communication is over between terminals of the other side. If it is assumed that (n) units of terminals work at one time, the terminal speed is set at 1/n transmission speed of circuit. In such a way, the circuits of a smaller number of terminals are used with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to conversion of facsimile communication speed when a small number of lines are shared by a plurality of terminals to perform factor-based communication.

In conventional 7-axis IJ communication, most communication lines and terminals have a one-to-one correspondence. If you are a large customer who installs multiple devices for the same subscriber, you will have to contract for the number of lines according to the number of terminals, and the monthly line usage fee will be reduced to a single monthly usage fee. It is multiplied by the number of installed terminals, and the negative economic impact is large. For this reason, subscribers with multiple terminals may install a multiplexing device 17 and use a method of connecting multiple terminals for communication in order to effectively utilize lines and reduce costs.

In this method, (1) the speed of each terminal is determined by dividing the line speed by the number of terminals connected to the multiplexer. (II) Each terminal may have a unique transmission speed, but not a uniform speed. However, in case (I), each terminal can always communicate with multiple terminals among the same subscribers, but if only one terminal needs to communicate, the factor 9. Calls can only be made at a speed calculated by dividing the transmission speed by the number of terminals connected to the multiplexer, which does not lead to effective use of the line.

As a practical matter, it is considered that there are very few cases in which two or more devices connected to a multiplexer communicate at the same time11, and the lj case is extremely wasteful. However, in the case of (II) (/: 1 is equal to the transmission speed of 7 lines), if even one terminal communicates, the shortcomings such as "IJ+ri" (Fi is slow, etc.) In particular, if you want to send an urgent message later, there is a drawback such as not being able to perform interrupt communication. The terminal connected to the device can always communicate with the other party and is secure.
If one terminal (7) does not need to perform communication operations, the facsimile machine can utilize the full transmission speed of the line, allowing high-speed transmission (1).

In order to facilitate understanding of the present invention, the prior art will be explained in more detail using FIGS. 1 to 4.

FIG. 1 is an example of a conventional communication system. This is a case where one subscriber 7 has a plurality of terminals 1, 2.3 installed in the system shown in FIG. 1, and a subscriber 8 has a plurality of terminals 4, 5.6 installed. For example, a communication line is used for mutual communication between the two parties! l, 10
．． 11 between terminals 1-4, 2-5, and 3-6. In this case, there are disadvantages such as whether each terminal can communicate at the same time or not, and the fee for using the same line must be charged for each terminal every month.

Figure 2 is an improved version of Figure 1, and shows a method in which multiple terminals are connected to subscribers 7 and 8 (7 and multiplexing devices 12 and 13 are installed) to manage the communication connections of multiple terminals. .Communication line]/Il'i1 line or il, depending on the connection number l'4 of the device connected to the multiplexer
Just tie it with a book [less than 7 terminals].

The method shown in Figure 2 can be further divided into the 4>i method and the (7) method. Figures 3 and 4 show 1-+. , 5.6 all operate at the same speed, the terminal speed f: is selected by dividing the line transmission speed by the number of terminals that can be connected to the multiplexer. B) Communication is possible as soon as communication is required, but when there is little communication traffic such as when only one terminal is operating H: There are drawbacks such as the inability to effectively utilize the 11!1 line. Kono 1. For l - Figure 4 shows more than one -
This is an example of a communication method when the speed of the I- terminal is equal to the transmission speed of the line, but in this case, if a terminal operating at a speed equal to the transmission speed of the line is communicating, the line If the terminal is occupied, terminals connected to other multiplexing devices may not be able to communicate.

Therefore, consideration must be given to installing additional communication lines.

The present invention has been made to compensate for the drawbacks of the conventional methods described in i'lfl, and includes the communication method shown in FIG.
In addition to combining both of the communication methods shown in the figure, this speed conversion! 1 (This is characterized by being performed in the middle of an I-communication. It will be explained in detail below.

It is assumed that the communication speed of each terminal is equal to, for example, the transmission speed of the line. It is assumed that one terminal 1 of subscriber 7 and one terminal 4 of subscriber station 8 are still communicating (see FIG. 7). In this case, the line is not occupied between terminals 1-4.

Next, assume that a request for communication occurs between terminals 2-5 during communication between terminals 1-4. In this case, the QHr terminal 2 issues a request for communication connection to the multiplexer 12. The multiplexer 12 is the terminal 2
Requirement 5 - Upon receiving the request, the information transmission timing is delayed to terminal 1, and the information is sent to transmission line 14.] The information is information between terminals 1-4 and information between terminals 2-5. This method consists of: Furthermore, when the communication between either the XM terminals 1-4 or 2-5 is completed, the communication speed between the other terminals can be doubled because the communication line 14 can be occupied. In addition, there are 2 terminals connected to the multiplexer.
The number of terminals may be on Jg, and if n terminals operate simultaneously, the terminal speed will be (line transmission speed)/71. Speed conversion during communication will be explained below.

FIG. 5 shows data frames sent from each terminal and transmitted to the other terminal via the communication line 14. 21 and 24 for data link control. 22 is a subaddress of the own terminal and the communication partner terminal, and includes a parameter indicating whether the data frame is a control signal or an image information signal frame, and a terminal parameter t'i'1 for recording and processing the data frame. Reference numeral 23 denotes an information field 6- consisting of a predetermined octet length.

Figure 0 shows data received (and sent from the terminal).
A response phone soufflé!・Show me. 25tj:ys, 1
' is a no-field that occludes the content of the response, and indicates that the receiving terminal is not in a receiving state if it is ready to receive the next data frame.

Further, FIG. 7 shows the multiplexing device 12. 1: The floc composition of the sea urchin is shown. 26 is a memory for storing transmission data on the side of the multiplexer 12, and 28 is a memory for storing received data. This is a 20-piece communication line support unit, and controls the interface between the communication line and the multiplexer]2. Also, 27
This is a control unit that manages the operations of kl-, 26, 28, and 29. Similarly, 31 is the reception tape on the multiplexer 13 side.
33 is a memory for storing transmission data, and 3o is an ink storage memory between the communication line and the multiplexing device 1:3.
In charge of the 7th engineering department.

Also; 2nd 1nd (1, 3): This is a control unit that manages the operation of the controller. Now, we will explain about FIG. 7. One of the IN terminals connected to the multiplexer 12 requests communication. For example, when a call request is issued to the terminal 1, the request is sent to the transmission data storage memory 26 via the communication line 15.

The data in the sending boot storage memory 2 () is constantly notified to the control unit 27, and a connection request for the FL1 communication partner is issued. - to connect to the other subscriber.
However, if the communication line 4 is a public line, it is necessary to make a general call. −
! The received call 1111 also cannot make a call. Communication line 1
If 4 is a leased line, the other party is connected in advance.
ing.

Once the communication line is set up, the state shifts to a data transfer state, and the terminal 1 enters a state in which transfer of data 7 frames is started. The data 97L/-7. which is not sent from the terminal 1 is stored once in the storage memory 26 and becomes 1'. This accumulated information is transmitted to the interface section 29 based on the command from the control section 27.
and is sent to the Aicho terminal via the communication line I/I (-).

Multiplexer 1: One side checks the Zafatres portion 22 of the received data and transfers it to the corresponding terminal. For example, assume that the tail is sent to terminal 4 and is J'). Terminal 4 checks errors in received data using trailer 2/1 L, N
If the signal is lost, a &sense response shown in FIG. 6 is sent to the transmitter side to indicate that it is waiting for reception of the next data frame. This response once enters the storage system 33, but based on a command from the control section 320, it passes through the interface section 30 and is sent to the multiplexing device 12 via the communication line 4. In the multiplexer 12, the signal passes through the interface section 29 and is stored in the receiving section storage memory 28. Receiving unit accumulation mesaku 2
The contents of 8 are checked by the control unit 27 and immediately transferred to the terminal 1. In this way, the information sent from terminal 1 is transmitted to the other party's terminal, and 17 sponses are sent back from the other party's terminal. In this case, the terminal speed is line] 4, transmission speed 2, etc.

Next, when a request to communicate from terminal 2 to terminal 5 or 6 occurs during communication between terminals 1 and 4, the call request signal from terminal 2 is not included in the data frame shown in Figure 5 and is multiplexed. It is stored in the transmitter storage memory 26 of the device 12. Judging whether the field 23 of this data frame is a call request or an image information data field 9-1, whether the field 23 is currently in progress, and where the other party's terminal is are determined by looking at the henoki 22. .

If the data frame !\ indicating that there was a call request from the terminal in communication 1 is included in the accumulated message, the control unit 27 checks and Jl, The internal medicine data frame is inserted between the data frames from ψ1111 end 1 during the current incident at timing 4, and is transmitted to the other party.The call is sent to the other party's Rcl storage memory. It checks that the requested data frame is included and notifies the other party's terminal 4 of the request.The other party's terminal 4 responds with a response indicating whether or not it can receive the data frame.This response is stored in the storage memory. 33 and transmitted between the terminals 1-4 based on the command from the control unit 32.
The signal is inserted between frames 1' and sent to multiplexer 12. In the multiplexing device 12, the signal is once stored in the receiving section storage memory 28, and the control section 27 checks the status of the other terminal. If the communication signal capacity is 1 to 1, this is notified to terminal 2, and communication between terminals 2 to 5 is started. The transmission timing of the data frames of terminal 1 and terminal 2 is managed by the control unit 27.

FIG. 8 shows a block configuration of the transmitter storage memory 26,
FIG. 9 shows a block configuration of the receiver storage memory 28. :(4, 35, 36, 38, 39, 40 indicate storage memory blocks 1-. Each storage memory block can store several data frames. For example, ◆1 to Φ1L It is sufficient that a response is received from the receiving side before the data frames are accumulated and transferred.n,
7 is usually used. Reference numerals 37 and 41 indicate changeover switches, which are managed by the control section 27.

This operation will be explained below.

It is assumed that communication between terminals 2 and 5 is performed while communication between terminals 2 and 4 is in progress. Data frames are being transferred between terminals 1-4, and responses to previously sent data frames are being returned in sequence.

At this stage, the terminal 2 attempts to start transferring data. First, information from the terminal 2 is stored in the storage memory block 35. This information is sent out in units of data frames by scanning a changeover switch managed by the control section 27.

In other words, the changeover switch in this case is the storage memory 34 and 3.
5 is repeated, and the information of terminal 1 and terminal 2 is sent out in units of data frames. On the other hand, the storage memory unit 28 shown in FIG. 9 receives responses to the information sent from terminals 1 and 2, and sends them back to terminals 1 and 2. The response sent from the transmission path 14 is 1. lJ4? A switch 41 stores responses in the memory 1+tsq corresponding to each terminal. Since vJ terminal 1 and terminal 2 are operating in the embodiment, the operation of changeover switch 41 alternately switches between memory blocks 38 and 39. 38
The responses stored in 39 and 39 are transferred to each terminal according to instructions from the control section 27. This transferred response requests the corresponding terminal to send the next data frame, and each terminal sends a data frame!・ will be transmitted sequentially. The control unit 27 may check the storage status of data frames in the memory block 34 on the data sending side and send a response to the terminal. Furthermore, storage memory 3
The memory size of 8 is sufficient as long as it can store data frames from 4&1 to ≠7t. This is because the transmitting side cannot send more data frames than the number of data frames up to φn, so the number of data frames in the response can also be less than φn.

The control unit 27 manages the sending speed of data frames from each terminal, and when there is only one terminal in operation, the speed of that terminal can correspond to the transmission speed of the line.
When there are two operating terminals, the timing of transmitting data frames is managed by the control section, so the speed of each terminal is equal to the line speed divided by two. Similarly, when 3 terminals operate, the line speed is divided into 3 and the terminal speed is assigned to the terminal speed, and when 1 terminal operates, the line speed is divided into 7 and the terminal speed is assigned.

In addition, in the above embodiment, the case where the maximum communication speed of each terminal is equal to the transmission speed of the line is explained] ~ However, the same idea can be applied to the case where the maximum communication speed of each terminal is different. It can be implemented by In that case, for example, if the speed of the transmission circuit is 64 k
bit/sec, and there are two operating terminals connected to the multiplexing device 26, and the maximum communication speed of the first terminal is (i 4 k bi
t/see, the maximum communication speed of the second terminal is 1
6 k bits/see, for example, the first terminal is set to 48 k bits/see so that the transmission rate from the terminal to the multiplexing device is faster than that of the second terminal.
bit/see, the second terminal is 16 k bi%/s
ee, and correspondingly control the connection period of the changeover switch of the multiplexing device so that the first terminal is assigned a period of 7 of the changeover switch cycle.

In other words, if the maximum communication speed of each terminal is different, a value obtained by simply dividing the line transmission speed by the number of operating terminals may be assigned as the transmission speed of the operating terminal. In order to perform more efficient transmission, take into account the maximum communication speed of the terminal and allocate a different transmission speed for each terminal during C1 operation, and also set the connection period of the changeover switch to correspond to the above transmission speed. All you have to do is control the allocation.

Further, the present invention can be implemented by adding various changes and modifications to the above-mentioned embodiments, such that communication between two subscribers is such that one party is on the sending side and the other is on the receiving side. However, it is also possible that transmitting terminals and receiving terminals coexist in one subscriber area.

The number of communication lines 14 to be accommodated may be increased to two or more, and the number of terminals accommodated in the multiplexing device may be further increased, and in addition to communication between both subscribers A and B, communication between A and C and between A and A may be Communication with multiple destinations is also possible as shown in D.

Although we have shown an example of a 4W (four-wire configuration) communication line, it is also possible to use a half-duplex two-wire configuration.

Furthermore, it is also possible to limit the terminal functions to dialing and data transmission/reception functions (reading and recording functions), and provide the multiplexing device with digital encoding, decoding, and transmission control functions. The configuration becomes extremely simple, and hardware such as code/decoder circuits and transmission control circuits can be shared. However, in this case, a start/stop function is required to operate the mechanical parts of the terminal.

As explained in the following, the present invention is capable of improving the efficiency of communication lines by using fewer communication lines than the number of terminals for communication of a subscriber accommodating a plurality of terminals. Since you can communicate with the other party even from the terminal on your shin, an efficient system is possible.

[Brief explanation of the drawing]

FIG. 1 shows a conventional communication configuration, FIG. 2 shows a conventional communication configuration and a communication configuration according to the present invention, FIGS. 3 and 4 show a conventional communication method, and FIG.
6 is a diagram of the data frame and response in this embodiment, FIG. 7 is the block configuration of the multiplexing device, FIG. 8 is the configuration of the storage memory on the transmitting side, and FIG. 9 is the storage memory on the receiving side. This shows the configuration of each. 1 to 6...Terminal, 7, 8...
・Subscriber, 9-11, 1.4 ......Communication line, 15-20.15'-20'...
Communication line between terminal and multiplexer, 12.13...
...Multiplexer, 21.24...Header and trailer for data link control, 22...
...field indicating subaddress, control signal, terminal parameter section, 23... rule/data field, 25... field indicating response information, 26.33... ...Accumulation memo IJ of transmitting section, 28.31...Accumulation memory of receiving section, 27.32...Control section, 29.30.
・・・・・・Interface section with line, 34-3
6.38~40... Memory block,
37, 41°......changeover switch. =17=

Claims (1)

[Claims] In a facsimile communication system in which a plurality of terminals such as 7Axis IJ terminals are connected to a multiplexer and document information is transmitted between subscribers via communication lines, only one of the operating terminals connected to the multiplexer is connected to a multiplexer. 1 for things only. Scanning is performed by the changeover switch circuit of the multiplexing device, and the scanning and the data transmission rate from the operating terminals to the multiplexing device are calculated based on the number of operating terminals and the communication capability of those terminals. A facsimile communication system that is characterized by switching control based on speed.