JPH09247289A - Communication control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide whether or not the communication control unit which sends and receives data through an ISDN basic interface can communicate with an opposite terminal before charging is started and suppress the unnecessary charging of a transmitting terminal side. SOLUTION: The communication control unit 2 is equipped with a line control unit 25. At transmission time, terminal state decision information deciding whether or not an opposite terminal is ready for reception is added to an ISDN subaddress and transferred and after answer information showing that the opposite terminal is ready for reception is received from the opposite terminal, a line connecting process is performed. At termination time, the terminal judges whether or not its device is ready for reception from the terminal state decision information and when so, a line connecting process is performed after answer information showing that this terminal is ready for reception is transferred to the transmission source terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device for transmitting and receiving data via an ISDN (Integrated Services Digital Communication Network) basic interface.

[0002]

2. Description of the Related Art Conventionally, in transmitting and receiving data using an ISDN basic interface, there are respective essential conditions peculiar to a terminal device, and communication is started after each device determines whether communication is possible under those conditions. There was a need.

That is, after connecting the partner terminal to a communication control line called D channel and entering the charging state,
Whether or not the partner terminal is receivable is determined by the in-protocol negotiation process of the data communication line called B channel.

[0004]

In the above-mentioned conventional communication control method, since the state of the partner terminal is judged after entering the billing state and it is confirmed whether communication is possible, even if the partner terminal cannot receive data. There is an inconvenience that the transmission terminal side pays a useless communication charge, and it takes time and effort for the transmission partner.

The present invention has been made in order to solve such a problem, and it is possible to determine whether or not communication with a partner terminal is possible before the start of charging, and to suppress wasteful charging on the transmitting terminal side. The purpose is to provide.

[0006]

In the communication control device of the present invention, at the time of transmission, the ISDN subaddress is added with the terminal status determination information for determining whether or not the other terminal can receive, and the information is transferred, and a response notification indicating that the other terminal can receive the response is sent. The control means for performing the line connection processing after receiving the information is provided.

Further, in the communication control device of the present invention,
Control to determine whether or not the device itself can receive based on the terminal status determination information added to the ISDN subaddress acquired when receiving a call, and to transfer the response notification indicating that it is possible to receive to the source terminal when receiving, and then perform line connection processing Means are provided.

Further, in the communication control device of the present invention,
At the time of transmission, the terminal status judgment information for judging whether the other terminal can receive is added to the ISDN subaddress and transferred. After receiving the response notification of the reception possibility from the other terminal, the line connection processing is performed, and at the time of incoming the terminal status judgment information. Based on the above, a control means is provided for determining whether or not reception is possible in the own device and transferring a response notification indicating that reception is possible to the transmission source terminal when reception is possible, and performing line connection processing.

According to the present invention, the communication control device on the transmission side adds the terminal state determination information to the ISDN sub-address to notify the call setting, and the communication control device on the reception side transmits the terminal device based on the terminal state determination information. After making a call setting response indicating that the call can be received, line connection processing is performed and charging is started.

[0010]

FIG. 1 is a block diagram of a communication system using a communication control device according to the present invention, in which an ISDN basic interface communication network 1 is connected with a lower device 3 via a communication control device 2 according to the present invention. The configuration is shown.
The lower-level device 3 includes a digital copying machine, a data backup device, and the like.

FIG. 2 is a block diagram of a communication control device according to an embodiment of the present invention. A SCSI (small computer system interface) control unit 20 connects the lower device 3 by using the international standard SCSI. It is provided to make it possible.

Further, a DMA (direct memory access) control unit 2 for transferring data from the SCSI control unit 20.
1. Image memory 2 for internally storing transfer data
2. Image control unit 2 for controlling the image memory 22
3, a panel control unit 24 for controlling the lower-level device 3 by a panel instruction, a line control unit (control means) 25 for passing data held in the image memory 22 or data from a line, and controls the entire system. It has a main control unit 26, a program memory 27 for storing various programs, and a work memory 28.

This communication control device 2 is a lower device 3 on the transmitting side which attempts to transmit to the partner terminal when transmitting to the line control part 25.
It has a function of adding the manuscript information of and notifying the other terminal. Further, at the time of reception, it is provided with a function of checking whether or not the lower-level device 3 on the receiving side can receive the document information notified from the transmitting side.

FIG. 3 is a diagram showing the data allocation of the ISDN subaddress used in the present invention. The ISDN subaddress 30 is ISD along with the ISDN number (not shown).
The ISDN number indicates the country code and the subscriber number, whereas the ISDN subaddress 30 is an additional address area assigned to identify terminals and extensions other than the ISDN number, and the real subaddress area 3
Such a number is set in 1.

Since the ISDN subaddress 30 is defined to have a maximum of 40 digits, in the present invention, information for determining the state of the partner terminal is added to the remaining area. That is, a resolution area 32 for setting the resolution of the original document to be transmitted to the partner terminal, a horizontal pixel number area 33 and a vertical pixel number area 34 for setting the pixel number of the original document to be transmitted. Although the information about the resolution and size of the original to be sent is added here, other information such as the number of sheets sent, the personal identification number, and other information that can be used as judgment information can also be notified to the receiving side partner terminal. Is.

Next, referring to the flow chart shown in FIG. 4 and the sequence diagram shown in FIG. 5, the transmission operation performed by the communication control device 2 on the transmission side to the communication control device 2 on the reception side will be described.

First, in the transmission preparation state, the communication control device 2 is activated (step 40), and the resolution of the document to be transmitted is acquired from the panel control section 24 (step 41). Then, the vertical and horizontal document sizes of the document to be transmitted are respectively acquired from the panel control unit 24 (step 4
2) The acquired data are set in the corresponding areas 32 to 34 of the ISDN subaddress 30 as terminal status determination information (step 43), and the transmission process is performed on the communication network 1 (step 44).

In this transmission processing, the call control message is notified by transmitting the ISDN address from the communication control device 2 on the transmission side to the communication network 1 (step 51). If the notified terminal state determination information indicates that the call can be received, the communication control device 2 on the receiving side notifies the call setting acceptance message (step 52) and enters the charging state. After that, line connection processing is performed to connect to the B channel. If the notified terminal state determination information indicates that the reception is not possible, the partner terminal notifies the release notification (step 53) and rejects the incoming call. In this case, there is no charge.

Next, with reference to the flow chart shown in FIG. 6 and the sequence diagram shown in FIG. 7, the operation when the communication control device 2 on the receiving side receives an incoming call from the communication control device 2 on the other transmission side will be described. .

When the communication control device 2 on the receiving side detects an incoming call (steps 60 and 71), the terminal state judgment information designated by the transmitting side is acquired from the subaddress 30 of the notified ISDN address (step 61), and this terminal state is determined. The resolution is acquired from the determination information (step 62), and the document size is further acquired (step 63).

Then, the memory capacity that can be received at the present time is calculated for the lower device 3 connected to the communication control device 2 on the receiving side, the information is obtained (step 64), and the paper that can be output by the lower device 3 is obtained. The size is calculated and the information is acquired (step 65).

In this way, when the memory capacity and the outputtable paper size of the receiving lower device 3 are acquired, the receiving communication control device 2 determines whether the receiving lower device 3 can output at the resolution and the document size specified by the transmitting device. It is determined (step 66). If it is determined that the document can be output, the memory size of the document to be transmitted is calculated using the document size on the transmission side, and it is determined that the memory capacity can be received by the lower device 3 on the reception side (step 67).

If it is determined that the memory capacity can be output to the receiving lower device 3, a process for accepting an incoming call is performed (steps 68 and 72), a line connection process is performed, and then communication is performed. From this time, the charging is started at the transmitting terminal.

If it is judged that the output is impossible due to either the paper size or the memory capacity, the transmission side communication control unit 2 is notified of the incoming call rejection (steps 69, 7).
3), disconnect the line. At this time, the communication control device 2 on the transmission side does not enter the charging state. In this way, before the start of billing, it is determined whether or not the terminal device on the receiving side can communicate.

In the above-mentioned embodiment, the receivable memory capacity and the receivable paper size of the receiving side lower device are used as the judgment factors. By grasping all the states of the lower device such as paper jam of the lower device, it is possible to suppress wasteful charges from the transmitting side.

[0026]

According to the communication control device of the present invention, the ISD
After the terminal setting judgment information is added to the N sub-address to notify the call setting, and there is a call setting response that the receiving side terminal device is receivable based on this terminal status judging information,
Since I started the billing by performing the line connection process,
It is possible to prevent the sending terminal from performing useless charging.

[Brief description of drawings]

FIG. 1 is a block diagram of a communication system using a communication control device according to the present invention.

FIG. 2 is a block diagram showing a communication control device according to an embodiment of the present invention.

FIG. 3 is a data allocation diagram of an ISDN subaddress used in the present invention.

FIG. 4 is a flowchart showing a transmission process.

FIG. 5 is a sequence diagram showing a transmission procedure.

FIG. 6 is a flowchart showing an incoming call process.

FIG. 7 is a sequence diagram showing an incoming call procedure.

[Explanation of symbols]

 1 ISDN Basic Interface Communication Network 2 Communication Control Device 3 Lower Device 20 SCSI Control Unit 21 DMA Control Unit 22 Image Memory 23 Image Control Unit 24 Panel Control Unit 25 Line Control Unit 26 Main Control Unit 27 Program Memory 28 Work Memory 30 ISDN Sub Address 31 Actual sub-address area 32 Resolution area 33 Horizontal pixel number area 34 Vertical pixel number area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahito Hirokawa, 94, Kuniyama City, Fukushima Prefecture, Senba 94, Nippon Steel Telecom Technology Co., Ltd. (72) Nobuhito Sato, 94, Kuniyama City, Fukushima Prefecture, Nikko, Ltd. Within Telecom Technology

Claims (3)

[Claims] 1. In a communication control device for transmitting and receiving data via an ISDN basic interface, at the time of transmission, the ISDN subaddress is added with terminal state determination information for determining whether or not the other terminal can receive, and the data can be received from the other terminal. A communication control device comprising control means for performing line connection processing after receiving a response notification from the communication control device. 2. A communication control device for transmitting / receiving data via an ISDN basic interface judges whether or not it can be received by the own device based on the terminal status judgment information added to the ISDN subaddress at the time of an incoming call, and the data can be received. If any, the communication control device is provided with a control means for performing a line connection process after transferring a receivable response notification to the transmission source terminal. 3. In a communication control device for transmitting and receiving data via an ISDN basic interface, at the time of transmission, the ISDN subaddress is added with terminal state determination information for determining whether or not the other terminal can receive, and the data is transferred from the other terminal. After receiving the response notification of availability, the line connection processing is performed, and when receiving a call, the reception status of the device is judged based on the terminal status judgment information, and when reception is possible, the response notification of reception is transferred to the source terminal. A communication control device comprising control means for performing line connection processing later.