JPH01129629A - Transmission data collision detection system - Google Patents

Abstract

PURPOSE:To attain processing by connecting plural terminal accommodation sections having an error information read section in their inside, a node common section and a control section by plural lines and common transmission data bus so as to detect the terminal accommodation causing an error quickly. CONSTITUTION:A node common section 4 sends a transmission data subject to packet processing inputted via a common transmission data bus 81 to a transmission line. Then a packet processed transmission data from terminal accommodation sections 6, 7 is received and an error is detected, then error information is sent to error information readout section in the node via a 1st line 82. In this case, only error information readout sections 63, 73 in the terminal accommodation section sending the packet processed transmission data sends the error information to the control section 5 via a 2nd line 83. Then the control section 5 sends a block signal to the terminal accommodation section sending error information via 1 3rd line 84 and the output side is interrupted so as not to send the packet processed transmission data from the accommodation section. Thus, the terminal accommodation section causing an error is detected and processed quickly.

Description

[Detailed Description of the Invention] [Summary] When transmitting data from a terminal is packetized in the terminal accommodating unit and sent to a transmission line via a common bus or the like.

A transmission data collision detection method that detects the transmission data from which terminal accommodating unit caused the collision when there is a collision of packetized transmission data on the common bus.The terminal accommodating unit that caused the collision can be quickly detected and corrected. Multiple nodes are connected to a common transmission path, and each node assembles the transmitted data from the connected terminals into packets.
A LAN system including a terminal accommodating unit that sends out to a common transmission data bus, a node common unit that sends packetized transmission data input via the common transmission data bus to the common transmission path, and a control unit, The terminal accommodating part and the node common part are connected by a first line, and the terminal accommodating part and the control part are connected by a second line and a third line, respectively, and error information is read to the terminal accommodating part. When the node common section detects a collision between bucketed transmission data from different terminal housing sections, error information is sent from the node common section to the remaining internal end via the first line. By notifying the unaccommodated unit, only the error information reading unit in the terminal accommodating unit that sent the bucketed transmission data sends the error information to the control unit via the second line, and the control unit The configuration is such that the bucketed transmission data is not sent out from the terminal accommodating unit that sent out the error information via the third line.

[Industrial application field]

The present invention provides a method for determining which terminal accommodating unit is transmitting data when there is a collision between the bucketed transmission data on the common bus when transmitting data from a terminal is bucketed in a terminal accommodating unit and sent to a transmission path via a common bus, etc. This invention relates to a transmission data collision detection method for detecting whether a data collision has occurred.

FIG. 4 is a schematic configuration diagram of a ring type LAN system, and FIG. 5 shows an example of a frame format. Hereinafter, the general operation of FIG. 4 will be explained with reference to FIG. 5, assuming that the delay time of the transmission path is O.

First, the supervisory control device SV sends out two signals in the frame format shown in FIG. 5 to, for example, a ring type optical transmission line at a constant period. A predetermined pattern is inserted into the frame synchronization signal at this time, the source address, destination address, and data fields are blank, and the transmission flag is O indicating unused, but the frame length is predetermined. .

Next, Node 8 adds the source address, destination address, and transmission flag to the data sent to the terminal and assembles it into a packet, but it leaves an unused signal (hereinafter referred to as an empty packet).
When the data (hereinafter referred to as "bucketized transmission data") is input through the ring optical transmission line, this bucketed transmission data (hereinafter referred to as "bucketed transmission data") is placed in an empty packet and sent out to the ring optical transmission line. .

Here, inside node A, terminal AI+8. , 3, etc. is converted into packetized transmission data and sent to the optical transmission path via the common data bus, but when two packetized transmission data collide on the common data bus, which terminal It is necessary to quickly detect whether packetized transmission data from a computer has caused a collision so that it can be dealt with.

[Conventional technology]

FIG. 6 shows a block diagram of a conventional example. In the figure, the packet assembling unit 22 in the terminal accommodating unit 2 assembles transmission data to and from the terminal into packetized transmission data with a destination as described above, and then sends a transmission request signal via a line 85. It is sent to the request signal analysis section 13 in the node common section 1.

Therefore, the request signal analysis section sends a transmission permission signal to the line 86 in consideration of the information on empty packet input from the transmission line monitoring section 12, which constantly monitors the state of the optical transmission line, and the transmission priority of the terminal accommodation section. The data is sent only to the data transmitting section 21 of the terminal accommodating section 2 via the terminal accommodating section 2.

As a result, only the packetized transmission data of the packet assembling section 22 is transferred to the data transmitting section 21. Common transmission data bus 8
1 to the node common section 1.

Parity is checked in the parity check section in this unit, and the error-free packetized transmission data is placed in an empty packet and sent out to the optical transmission line.

In addition, the lines 85 and 86 connect the node common part and the terminal accommodating part to one
:1 is connected.

[Problem that the invention seeks to solve]

Here, the terminal accommodating unit 3 also sent out a transmission request signal after converting the transmission data from the terminal A3 into packetized transmission data, but a transmission permission signal was not obtained.

On the other hand, the packetized transmission data is sent from the data transmission section 21 of the terminal accommodation section 2 which has received the transmission permission signal to the node common section via the common transmission data bus 81. Due to a failure in the data transmitter 31, bucketed transmission data is also sent from there to the common transmission data bus 81, two packetized transmission data collide on this bus, and abnormal data is input to the node common section l. do.

In the node common section 1, the parity check section 11 detects an error in the packetized transmission data, indicating that there has been a collision, but it is unclear where the terminal housing section was that sent the packetized transmission data without a transmission permission signal. Since I don't know,
To find this, you have to stop the system and check each one individually.

Therefore, there is a problem in that prompt detection and treatment are difficult.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 6.7 is a terminal accommodating unit that assembles transmission data from connected terminals into packets and sends them to the common transmission data bus 81, and 4 is the packetized transmission data input via the common transmission data bus. , and 5 is a control unit.

Further, 82 is a first line connecting the terminal accommodating sections 6, 7 and the node common section 4, and 83.84 is a first line connecting the terminal accommodating sections 6, 7 and the node common section 4.
and the control section 5, and 63.73 is an error information reading section provided in the terminal accommodating section.

When the node common section 4 detects that the packetized transmission data from different terminal accommodation sections collide, the error information is transmitted from the node common section to the internal remaining end via the first line 82. By notifying the unaccommodated unit, only the error information@reading unit 63, 73 in the terminal accommodating unit that sent the packetized transmission data sends the error information to the control unit via the second line, and The control unit controls the third line 8
Terminal housing unit 63.73 that sent the error information via 4
Prevent packetized transmission data from being sent out.

[Effect]

The present invention connects the node common part 4 and the terminal accommodating parts 6, 7 with a first line 82, and connects the control part 5 and the terminal accommodating parts 6, 7 with a second line 83 and a third line 84. , error information reading sections 63 and 73 are provided in the terminal housing sections 6 and 7.

Now, when the node common unit 4 receives the packetized transmission data from the terminal accommodating unit and detects an error, the error information is sent to the first
At this time, the error information is sent to all the error information reading sections in this node via the line 82.

Only the error information reading units 63 and 73 in the terminal accommodating unit that sent the packetized transmission data read the error information into the second
The signal is sent to the control unit via the line 83.

Therefore, the control section sends a blockage signal via the third line 84 to the terminal housing section that sent the error information.

The output side is turned off so that packetized transmission data is not sent out from this storage unit. Here, the second line.

Since the third line has a 1:1 connection between the control section and the terminal accommodating section, the control section can immediately detect the terminal accommodating section that sent out the error information.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of FIG. 2. Note that the symbols on the left side of FIG. 3 indicate the waveforms of the portions with the same symbols in FIG.

Here, the parity check section 41. transmission path monitoring section 42,
The request signal analysis section 43 is a component of the node common section 4, the data transmission section 61.7L, the packet assembly section 62.72,
Error information reading unit 63.73. AND gate 64,
74 is a component of the terminal accommodating portion 6.7.

The operation shown in FIG. 2 will be explained below with reference to FIG.

The packet assembling sections 62.72 of the terminal accommodating section 6.7 generate packetized transmission data using the transmission data from the terminals A, . Therefore, the request signal analysis section 43
Then, based on the information from the transmission path monitoring section 42, the terminal housing section 6
A transmission permission signal is sent only to the transmitter (see Fig. 3-■).

The terminal accommodating section 6 that received this transmission permission signal turns on the AND gate 64. The packetized transmission data is sent to the node common section 4 via the common transmission data bus 81 (see FIG. 3--). At this time, the data transmitter 71 mistakenly sends the packet transmission data to the AND gate 74. Since data is sent to the node common unit 4 via the common transmission data bus 81 (see Figure 3-■), data collides at the point marked with an Receive incorrect packetized transmission data as shown. For this reason, errors are detected by the parity check performed by the parity check section 41, and error information is sent from there via the first line 82 to all error information reading sections.

When the corresponding data transmitting section sends packetized transmission data, each error information reading section reads the second line from the start of data transmission to the second line, for example, when error information is input between the time when the next frame synchronization signal is detected. Control unit 5 via
Since the information can be transferred to the control section 5, the error information from the error information reading section 63 and 73 is transferred to the control section 5.

Therefore, the control section sends a blocking signal to the terminal housing section 6.7 via the third line, turns off the AND game 64.74, and prohibits the transmission of packetized transmission data.

If the request signal analysis section 43 provides information on which terminal accommodating section the transmission permission signal was sent to, the first control section 5 can block only the terminal accommodating section 7 based on the error information.

Further, the same effect can be obtained by providing the error information reading section 63.73 in the node common section 4, sending data transmission information from the data transmission section 6L 71 as described above, and performing the same operation as described above.

In other words, it is possible to quickly detect the terminal accommodating section in which the error has occurred and take corrective action.

〔Effect of the invention〕

As described above in detail, one advantage of the present invention is that it is possible to quickly detect a terminal housing part in which an error has occurred and take appropriate action.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the operation of Fig. 2, Fig. 4 is a schematic configuration diagram of a ring type LAN system, Fig. 5 The figure shows an example of a frame format, and Figure 6 shows a block diagram of a conventional example. In the figure, 4 is a node common section, 5 is a control section, 6.7 is a terminal accommodating section, 63 and 73 are error information reading sections, 81 is a common transmission data bus, 82 is a first line, and 83 is a second line. track, 84 indicates the third track.

Claims (1)

[Claims] A plurality of nodes are connected to a common transmission path, and each node assembles transmission data from connected terminals into packets,
A terminal accommodating section (6) that sends data to a common transmission data bus (81)
, 7), a node common unit (4) that sends packetized transmission data input via the common transmission data bus to the common transmission path, and a control unit (5). Terminal housing section (6, 7) and node common section (
4) and the first line (82), and the terminal accommodating portions (6, 7
) and the control section are connected to the second line (83) and the third line (
84), and the terminal accommodating portions (6,
7) is provided with an error information reading unit (63, 73), and when the node common unit (4) detects that packetized transmission data from different terminal housing units collides,
By notifying the error information from the node common section to all internal terminal accommodating sections via the first line (82), the error information reading section (63, 73) sends the error information to the control unit via the second line, and the control unit sends the error information to the terminal housing unit (63, 73) via the third line (84). ) A transmission data collision detection method characterized by preventing packetized transmission data from being sent out.