JPH08125714A - Communication equipment - Google Patents

Abstract

PURPOSE: To simplify the control of respective layer control parts by dividing pictures in an upper layer based on a data size decided by negotiation with an opposite equipment and sent from a lower layer and performing communication. CONSTITUTION: A CPU 101 is a system control part and controls the entire equipment and a ROM 102 stores the control program of the CPU 101. Then, a RAM 103 is constituted of an SRAM or the like and is for storing a program control variable or the like. Also, a registration setting value or the like is stored in the RAM 103. In this case, a layer 4 control part inside the ROM 102 connects a layer 4 to the opposite communication equipment, negotiates with the opposite communication equipment about a transport size and informs a layer 5 control part of the transport size. The layer control part 5 informs a layer 6 control part of the transport size. Then, the layer control part 6 divides the picture data of the control parts of the layers 5-3 which are the lower layers into processable data sizes and performs communication and thus, the control of the respective layer control parts is simplified.

Description

Detailed Description of the Invention

[0001]

The present invention relates to the International Organization for Standardization (hereinafter
The present invention relates to a communication device that communicates according to the OSI7 layer proposed by ISO).

[0002]

2. Description of the Related Art Conventionally, when communication is performed by using a communication device that communicates in conformity with the OSI7 layer, the communication data size is negotiated in each layer with a partner communication device to determine the communication data size in each layer. Was. Then, when data of a certain upper layer is transferred to the lower layer, the data may be transferred with a data size that exceeds the communication data size in which the lower layer can communicate.

[0003]

However, in the above-mentioned conventional example, the lower layer control section had to divide and transmit the communication data sent from the upper layer by using a communication procedure or the like. In addition, the terminal that receives the divided data needs a process of combining the divided data. As described above, when data of a size exceeding the communicable data size is sent from the upper layer to the lower layer, the control procedure of the control unit of the lower layer becomes complicated.

The present invention eliminates the above-mentioned drawbacks of the prior art, and divides an image in an upper layer for communication based on a data size determined by negotiation with a partner device and sent from a lower layer. Therefore, an object of the present invention is to provide a communication device capable of simplifying the control of each layer control unit in both the transmitting and receiving devices.

[0005]

According to the present invention, in a communication device that communicates in conformity with the OSI7 layer proposed by ISO, the communication data size in each layer determined by the connection procedure of each layer is Communication data size notifying means for each layer control unit to notify the upper layer control unit, and when negotiating the communication data size with the partner communication terminal in the connection procedure of each layer, the communication data size notified from the lower layer control unit When each layer control unit communicates the communication data of the upper layer by providing the negotiation means for negotiating the communication data size of the layer with the communication data size which is equal to or smaller than the communication data size, the communication can be performed without considering the communication data size. It is possible to simplify the control procedure of the control unit of each layer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A communication device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

In this embodiment, a G4 facsimile machine will be described as an example of a communication apparatus.

FIG. 1 is a block diagram of the configuration of the facsimile apparatus of this embodiment. Reference numeral 100 denotes a facsimile apparatus main body.

The CPU 101 is a system control unit,
Control the entire device. The ROM 102 stores the control program of the CPU 101. RAM103
Is composed of an SRAM or the like and is for storing program control variables and the like. The RAM 103 also stores setting values registered by the operator, management data of the apparatus, and various work buffers. The image memory 104 is a DR
It is composed of AM or the like and stores image data.

The resolution conversion processing unit 105 performs resolution conversion control such as milli-inch resolution conversion of raster data.

A communication coding / decoding processing unit (communication codec) 106 and a reading / recording coding / decoding processing unit (reading / recording codec) 107 code and decode image data handled by a facsimile apparatus. Process.

A communication control unit (CCU) 108 controls a facsimile communication protocol, and a line i / f unit 109 has an i / f for a communication line 116 such as ISDN and controls the communication line. It is something to do.

The scanner 111 is composed of a CS (contact sensor) image sensor, a document feeding mechanism, etc., and optically reads a document and converts it into electrical image data. This image data is subjected to correction processing by the image processing unit 110, and high-definition image data is output.

The operation unit 112 is composed of an LCD, a keyboard, etc., and is used for displaying various messages and for the operator to perform various input operations.

The line buffer 113 is a line buffer used for controlling transfer of image data.

The printer 114 is an LBP that records received images and file data on recording paper. The printer formatter 115 analyzes the printer description language and converts it into image data when printing file data from a workstation or the like.

FIG. 2 is a diagram showing where the control unit of each layer of the OSI7 layer is stored. As is clear from FIG. 2, the layer 1 control unit is stored in the CCU 1, and the layer 2 to layer 6 control units are stored in the ROM 102. In this embodiment, the layer 7 function is omitted because it is unnecessary.

FIG. 3 is a diagram showing a communication sequence during normal communication. Each procedure signal up to the communication of image data is shown in FIGS. 4 and 5. As is clear from FIGS. 4 and 5, the connection is sequentially performed from the lower layer to the higher layer. A post-procedure (procedure until disconnection of the line) after transmitting the image data in FIG. 3 is omitted in FIGS. 4 and 5.

FIG. 4 is a communication control sequence section when transmitting image data in this embodiment, and FIG. 5 is a communication control sequence diagram when receiving image data in this embodiment.

FIG. 6 shows the CPU 101 when transmitting image data.
FIG. 7 is a flowchart showing the control executed by the CPU 101, and FIG. 7 is a flowchart showing the control executed by the CPU 101 when the image data is received.

The characteristic communication control of this embodiment will be described below with particular reference to FIGS. First, FIG. 4 and FIG.
The process at the time of transmission will be described using. If the call request is made by the operator, the process proceeds from step S601 to step S602. In step S602, the layer 2 control unit connects the layer 2.

Next, in step S603, the layer 3 control unit connects the layer 3 and the packet size (layer 3 communication data size) is shown in the negotiation of FIG. Negotiate. Then, the packet size sent from the partner communication device, which is the result of the negotiation, is notified to the layer 4 control unit as shown in the connection confirmation of FIG.

In step S604, the layer 4 control unit notifies the packet size that the partner device can process and the transport size (layer 4 communication data size) is compared, and it is determined in step S605 whether the transport size processable by the own device is larger than the packet size processable by the partner device.

When it is determined in step S605 that the transport size is larger than the packet size, the transport size is adjusted to the packet size in step S606. The transport size changed in step S606 is notified to the partner device by negotiation.

When it is determined in step S605 that the transport size is equal to or smaller than the packet size, the negotiated transport size is set to the default value set in the own device.

In step S607, the layer 4 control unit connects the layer 4, negotiates the transport size changed or the default value in the communication procedure as shown in the negotiation, and notifies the partner device. As a result of the negotiation, the transport size sent from the partner device is notified to the layer 5 control unit by connection confirmation.

In step S608, the layer 5 control unit connects the layer 5 and notifies the layer 6 control unit of the same transport size as the one notified in the connection confirmation (FIG. 4).
Check the connection).

In step S609, the layer 6 control unit divides the image data according to the transport size notified from the layer 5 control unit and processes it into a communication data frame,
In step S610, an image data transmission request is made to the layer 5 control unit.

In step S611, the layer 6 processing section determines whether the image data has been transmitted. If the result of determination in step S611 is that image data has not been transmitted, control returns to step S609 to continue processing. On the other hand, if the result of determination in step S611 is that image data has been transmitted, step S
The communication ends at 612.

As described above, the layer 6 control unit divides the image data into a data size notified from the lower layer, that is, a data size which can be processed by the lower layer 5 to 3 control units, and frames the image data. The control of the layer control unit can be simplified. Moreover, since this data size is decided by negotiation with the other communication device,
Control of data processing can be simplified also in the partner communication device.

Next, the process at the time of receiving data will be described with reference to FIGS. 5 and 7. When an incoming call is received, step S
The process proceeds from step 701 to step S702. Step S70
In 2, the layer 2 control unit connects the layer 2.

Next, in step S703, the layer 3 control unit connects the layer 3, and the packet size (layer 3 communication data size) is negotiated with the partner communication device as shown in the negotiation of FIG. 5 in the connection procedure. To do. Then, the packet size sent from the partner communication device, which is the result of the negotiation, is notified to the layer 4 control unit as shown in the connection notification of FIG.

In step S704, the layer 4 control unit notifies the packet size that the partner device can process and the transport size (layer 4 communication data size) is compared with each other, and it is determined in step S705 whether the transport size processable by the own device is larger than the packet size processable by the partner device.

When it is determined in step S705 that the transport size is larger than the packet size, the transport size is adjusted to the packet size in step S706. The transport size changed in step S706 is notified to the partner device by negotiation.

When it is determined in step S705 that the transport size is equal to or smaller than the packet size, the negotiated transport size is set to the default value set in the own device.

In step S707, the layer 4 control unit connects the layer 4, negotiates the transport size changed or the default value in the communication procedure as shown in the negotiation, and notifies the partner device. As a result of the negotiation, the transport size sent from the partner device is notified to the layer 5 control unit by a connection notification.

In step S708, the layer 5 control unit connects the layer 5 and notifies the layer 6 control unit of the same transport size as that notified in the connection notification (FIG. 5).
Connection notification).

In step S709, the layer 6 control unit receives the image data received by the data reception notification from the layer 5 control unit.

In step S710, the layer 6 processing section determines whether the image data has been received. When the result of the determination in step S710 is that the image data has not been received, the control returns to step S709 to continue the processing. On the other hand, when the result of determination in step S710 is that image data has been received, step S
The communication ends at 711.

In this way, by determining the communication data size by negotiation with the device on the partner device side, the receiving device can receive data in a data size that can be processed by each layer control unit, and the received data can be received. The data processing control can be simplified.

As explained above, the O proposed by ISO
In a communication device that communicates according to the SI7 layer,
The communication data size notifying means for each layer control unit to notify the upper layer control unit of the communication data size in each layer determined by the connection procedure of each layer, and the communication data size is negotiated with the partner communication terminal in the connection procedure of each layer. In this case, by providing a negotiation means for performing communication data size negotiation of the layer with a communication data size which is equal to or smaller than the communication data size notified from the lower layer control unit, each layer control unit of both the transmitting and receiving communication devices is controlled by the upper layer. When communicating the communication data of
It is possible to perform communication without being aware of the communication data size, and it is possible to realize simplification of the control procedure of the control unit of each layer of both the transmitting and receiving communication devices.

In the above-described embodiment, the description has been limited to the facsimile machine, but the same applies to a terminal that communicates in accordance with the OSI7 layer.

[0043]

As described above, according to the present invention, an image is divided and communicated in the upper layer based on the data size sent from the lower layer determined by the negotiation with the partner device, and therefore both the transmitting and receiving devices are communicated. It is possible to simplify the control of each layer control unit in.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a storage state of each layer control unit of an OSI7 layer.

FIG. 3 is a diagram showing a communication sequence during normal communication.

FIG. 4 is a communication control sequence diagram at the time of image data transmission in this embodiment.

FIG. 5 is a communication control sequence diagram when image data is received in the present embodiment.

FIG. 6 is a flowchart showing control when transmitting image data.

FIG. 7 is a flowchart showing control when image data is received.

[Explanation of symbols]

 100 Facsimile device 101 CPU 102 ROM 103 RAM 104 Image memory 105 Resolution conversion processing unit 106, 107 Encoding / decoding processing unit 108 Communication control unit (CCU) 109 Line i / f unit 110 Image processing unit 111 Scanner 112 Operation unit 113 lines Buffer 114 printer 115 printer formatter

Claims (2)

[Claims] 1. In a communication device that communicates in conformity with the OSI7 layer proposed by the International Organization for Standardization (hereinafter referred to as ISO), each layer control unit sets the communication data size in each layer determined by the connection procedure of each layer to a higher level. A communication device comprising communication data size notifying means for notifying a layer control unit. 2. When the communication data size is negotiated with the other communication terminal in the connection procedure of each layer, the communication data size negotiation of the layer is performed with the communication data size equal to or smaller than the communication data size notified from the lower layer control unit. The communication device according to claim 1, further comprising a negotiation means for performing the communication.