JPH06177912A - Data transmitter and data transmission system using thereof - Google Patents

Abstract

PURPOSE:To improve a retrieval rate of required information and to enhance the data transmission efficiency by deleting address path information used already and not required as routing information from a frame. CONSTITUTION:When a packet frame is received by a reception processing circuit 24 from a reception line 21, a start delimiter (SD) 401 recognizes a head of a frame and discriminates the presence of routing address information 406 from a source address area 404 in the frame. When the information 406 is in existence and the information represents it that the packet frame is a packet frame transferred through a ring, the frame is fetched in a buffer 23, whether or not a segment number of a concerned station is in existence in SN1 to SNX412 to 415 in the information 406 is checked, and when in existence, an elimination circuit eliminates the numbers 412 to 415 and a conversion circuit revises a length byte to revise the length of the segment frame and the result is set to a length field 417.

Description

Detailed Description of the Invention

 [Object of the Invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a data transmission device which is connected between a plurality of networks and is suitable for relaying and transmitting a data packet in which route information to an incoming destination is designated in advance. The present invention relates to improvement of a data transmission method.

[0002]

2. Description of the Related Art Generally, transmission data adopted by a so-called source routing method, in which a data packet in which route information from a caller side to a call destination is previously designated is transmitted from a caller side through a plurality of networks. As shown in FIG. 4, a routing address field (route) 406 indicating route information to the incoming destination is configured.

A conventional data transmission apparatus connected between a plurality of networks is constructed as shown in FIG. 2, and a data packet received via a reception signal line 21 which is the preceding network is supplied to a reception processing circuit 24. The reception processing circuit 24 receives the start delimiter (SD) 401 shown in FIG.
From the source address area (Source Address) 404 in the frame to determine the presence / absence of routing address information (Route) 406. And routing address information 40
6 is present, and if this packet frame is a packet frame that crosses between rings, it is taken into the buffer 23, and the segment number of the local station is this routing frame.
SN1 to SNX (412 to 41) in the address information 406
It is checked whether or not it is in 5), and if there is, the packet frame of the buffer 23 is transmitted to 22 via the transmission processing circuit 25. Do not send if there is no segment number of your own station.

FIG. 1 shows an example of a data transmission system configuration in which a plurality of networks are sequentially connected by the data transmission device shown in FIG. In the configuration example of the data transmission system shown in FIG. 1, when the transmission data (data packet) shown in FIG. 4 is transmitted from the transmission side 11, each of the data transmission devices 12 to 15 on the way has an address field in the transmission data. Select one of networks B to D according to (Route) 406, and send data to the receiving side 1
Transmit to 1.

However, in the conventional data transmission apparatus and the data transmission method using the data transmission apparatus, paying attention to the routing address information in the transmission data, the data on the way from the transmission side 11 to the reception side 16 is transmitted. Even after passing through the transmission device, address information that has not passed and has been used since it has already passed is still present in the routing address information and is transmitted without being deleted. That is, the routing address information in the transmission data is always stored in the routing address field (40) until the transmission data reaches the reception side 6 from the transmission side 11.
6) The data was transmitted with the size kept constant, that is, the length was kept constant.

[0006]

The conventional data transmission device and the data transmission method using the data transmission device are configured as described above, and the data transmission devices 12 to 15 do not need routing address information which is already required. Was continuously transferred, the corresponding address was selected from the many routing addresses received by the receiving circuit 24 and stored in the buffer 23, which required a lot of processing time. In addition, the data transmission devices 12 to 15
Since the transfer is performed while leaving the routing address that is no longer needed in the address information, the frame length of the transmission data is maintained in an unnecessarily long state, and the transfer speed delay and transfer efficiency increase. There is a drawback of causing a decrease, and improvement has been demanded. [Constitution of Invention]

[0007]

According to a first aspect of the present invention, there is provided a packet data transmission device of a system in which, when a data packet is transmitted, route information for a destination to a destination is specified in the packet and transmitted. It is characterized in that it has a length conversion circuit for changing the length designation of the routing address information according to the change of the packet length due to the change of the route address information on the way to the destination.

A second aspect of the present invention is unnecessary in a packet data transmission apparatus of a system in which a transmitting side designates route information to a destination when transmitting a data packet and sends the data packet on the way to the destination. It is characterized in that the deleted address route information is deleted or the unnecessary route address information is ignored.

A third aspect of the invention is a packet data transmission apparatus of a system in which a transmitting side designates route information to a destination when transmitting a data packet, and becomes unnecessary on the way to the destination. Equipped with a local address route information removal circuit to delete the existing address route information, remove the used own address route information from the address information, and change the length of the packet to change the designation of the packet length. DATA TRANSMISSION DEVICE USING CIRCUIT, AND DATA TRANSMISSION METHOD USING NETWORK INCLUDING Plurality Of The Data Transmission Devices

[0010]

Since the data transmission apparatus of the present invention and the data transmission method using the data transmission apparatus have the above-mentioned configuration, the unnecessary address route information which has already been used as the routing information is deleted from the frame. By increasing the retrieval rate of necessary information and further shortening the data length, it is possible to increase the transmission speed and improve the data transmission efficiency.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data transmission device according to the present invention and a data transmission system using the data transmission device will be described with reference to FIGS. 1 to 7 (excluding FIG. 2). FIG. 3 is a circuit diagram showing an embodiment of the data transmission apparatus of the present invention, and the reference numerals in the drawing show the following components. Code 31 Received signal line Code 32 Transmitted signal line Code 33 Buffer for storing received signal Code 34 The start delimiter SD in the transmission data shown in FIG. 4 is recognized, and the presence or absence of routing information is determined by the first one of the source address 404. Reception processing circuit for detecting from the bit Code 35 Length byte conversion circuit for subtracting the length byte number of length field (L) 417 Code 36 Route address information removal circuit Code for removing the segment number of the own station from the frame Code 37 Transmission processing circuit for adding FCS, end delimiter, etc.

FIG. 4 shows the structure of a packet frame used in the data transmission apparatus of this embodiment, which is the frame structure of an IEEE802.5 token ring LAN (local area network). The symbols indicate the following contents. Code 401 Start delimiter indicating the beginning of the frame Code 402 Access control indicating the priority of the frame Code 403 Frame control indicating the type of frame Code 404 Source address indicating the source station Code 405 Destination address indicating the destination station Code 406 Routing information Routing field code 407 Information that stores data
Field code 408 Frame check sequence indicating frame check information Code 409 End delimiter indicating end of frame Code 410 Frame status indicating frame information Code 411 Control field for controlling routing information Code 412 to code 415 Segment number Code 416 Broadcast format Indicates broadcast bit Code 417 Length field indicating the byte length (length byte) of routing information Code 418 Direction bit indicating the advancing direction of the frame Code 419 Maximum frame bit indicating the maximum frame length Code 420 Reserved bit Code 421 Ring identifying the passing ring Number Code 422 Bridge number that identifies the passing bridge

An embodiment will be described below in detail with reference to mainly FIGS. 3 and 4.

First, when a packet frame of the format shown in FIG. 4 is input to the reception processing circuit 34 from the reception signal line 31 of the data transmission apparatus shown in FIG. 3, the frame is transmitted from the start delimiter (SD) 401 in FIG. The beginning is recognized, and the source address area (Source
The presence of routing address information (Route) 406 is determined from the Address 404. Then, if there is routing address information 406, and this packet frame is a packet frame that crosses between rings, it is taken into the buffer 33 in FIG. 3, and the segment number of the local station is this routing address information 40.
It is checked whether it is in SN1 to SNX (412 to 415) in No. 6, and if there is, the segment number removing circuit 3
6 with the segment number 412 (~ 41
5) is removed, and the packet due to the removal of the segment number in the length byte conversion circuit 35 of FIG.
In order to change the frame length, the length byte is converted and set in the length field 417. If the segment number of the local station is not in the routing address information 406, nothing is done thereafter.

The length number removing circuit 36 of FIG. 3 is configured as shown in FIG.
The segment numbers 412 to 415 of the station are sequentially read, and when the decoding circuit 57 of FIG. 5 detects the segment number of the own station, the selector is switched and only the segment number of the own station is skipped, and the next segment number is immediately displayed. 5 is output from the selector 56.

The length byte conversion circuit 35 of FIG. 3 is shown in FIG.
And the registers 61, 63, 65, 6 are configured as shown in FIG.
7, the length bytes are sequentially fetched from the buffer 33 and applied to the length byte conversion circuit 60. The conversion circuit 60 has a specific configuration as shown in FIG. 7. Inputs 701 to 704 are input in the order in which the input 701 is the MSB, and pass through gates 705 to 713 to take values of 9 to 1. The length bytes are subtracted and output to the outputs 714 to 717 in the order in which the output 714 is the MSB. The selectors 62, 64, 66, 68 in FIG.
Apply to. With this output signal, the selectors 62, 64, 6
By selecting 6 and 68, the converted values are set in the registers 63, 65, 67 and 69 of FIG. 6 and supplied to the buffer.

A frame in which the length byte 417 of the routing address information 406 of FIG. 4 is subtracted by these devices and the local station segment number in the frame of FIG. 4 is removed is sent to the transmission processing circuit 37 of FIG.
S is recalculated and is output to the transmission line 32 in FIG. 3, and finally the routing information of the local station is extracted from the frame and output.

Although one embodiment of the present invention has been described above, it can be used without deleting the unnecessary route address information (segment number which is unnecessary in this embodiment) on the way to the incoming destination. It is also possible to add a flag of No. 1 and the like and ignore it in the subsequent data transmission device.

[0019]

As described above, in the data transmission apparatus according to the present invention and the data transmission method using the data transmission apparatus, unnecessary address path information can be deleted from the frame to shorten the data length. Since the data transmission efficiency can be improved, the effect obtained in practical use is great.

[Brief description of drawings]

FIG. 1 is a system configuration diagram for explaining an embodiment of a data transmission device according to the present invention.

FIG. 2 shows a conventional configuration example.

FIG. 3 is a block diagram showing an embodiment of a data transmission device according to the present invention.

FIG. 4 is a diagram showing an input packet frame configuration example for explaining an embodiment of a data transmission apparatus according to the present invention.

FIG. 5 is a circuit diagram showing an embodiment of a segment number removing circuit according to the present invention.

FIG. 6 is a circuit diagram showing an embodiment of a length byte conversion circuit according to the present invention.

FIG. 7 is a circuit diagram showing one embodiment of the logical configuration of the length byte conversion circuit according to the present invention.

[Explanation of symbols]

31 reception signal line 32 transmission signal line 33 buffer for storing signals for the purpose of comparing reception signals 34 reception processing device for recognizing start delimiter and detecting presence or absence of routing information from address 35 subtracting length byte number Length byte conversion device for removing 36 Segment number removing device for removing the segment number of the own station from the frame 37 Transmission processing device for adding FCS, end delimiter, etc.

Claims (3)

[Claims] 1. A data transmission device for receiving and transmitting a signal in which a route address information from a source side to a destination is specified in a data packet on a transmitting side and storing a received signal including the route address information. Connected to a buffer,
A data transmission device comprising: a length conversion circuit for changing the length designation of the path address information; and a transmission processing circuit for transmitting the path address information having the length changed by the length conversion circuit. 2. A data transmission device for receiving and transmitting a signal, in which a route address information from a source side to a destination is designated in a data packet, is transmitted at a transmitting side, and a received signal including the route address information is stored. Connected to a buffer,
A route address information removing circuit for deleting unnecessary route address information on the way to the incoming destination or a circuit for ignoring unnecessary route address information is provided, and the unnecessary route is provided. A data transmission device comprising a transmission processing circuit for transmitting path address information in which address information is removed or ignored. 3. A data transmission device for receiving and transmitting a signal, in which a route address information from a source side to a destination is designated in a data packet, is transmitted by a transmitting side, and a received signal including the route address information is stored. Connected to a buffer,
A route address information removal circuit for deleting the route address information that is no longer needed on the way to the destination of the incoming call, a length conversion circuit for changing the length designation of the route address information, and a length conversion circuit And a data transmission system using the data transmission device, which comprises a transmission processing circuit for transmitting path address information having a specified length.