JPH0738564A - Lan line connection controller - Google Patents

Abstract

PURPOSE:To provide a LAN connection controller which immediately detects a fault caused by a LAN connection control part by itself without depending on the communication control of a protocol. CONSTITUTION:This controller is provided with a transceiver 2 for transmitting/ receiving data transmitting signals by connecting the transceiver itself to a LAN line 1, a transceiver 3 for monitoring the data transmitting signals transmitted/received by the transceiver 2, an address comparison part 5 for discriminating the data transmitting signals transmitted/received by the transceiver 2, a transmitting data check part 7 for detecting error by collating transmitting data transmitted by the transceiver 2 with transmitting data monitored by the transceiver a receiving data check part 8 for detecting error by collating receiving data received by the transceiver 2 with receiving data monitored by the transceiver 3, and a data abnormality report part 9 for reporting the error detected by the transmitting data check part 7 and the receiving data check part 8 to a communication protocol 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN connection control device, and more particularly to a LAN connection control device for monitoring transmitted / received data transmission signals in broadcast mode communication.

[0002]

2. Description of the Related Art A conventional LAN connection control device transmits a data transmission signal by knowing the success or failure of delivery by a confirmation response from a communication partner or by the sender not receiving a response from the communication partner within the monitoring time. It depends on either knowing the unsuccessful delivery of the data transmission signal. But L
In broadcast mode communication such as broadcast on an AN line, it is time-consuming and unreasonable to check the success or failure of individual delivery from a large number of communication partners in both the confirmation response method and the time monitoring method. The communication load is generated, and the advantage of the broadcast mode is lost. Therefore, the sender itself does not detect the success or failure of the communication. Then, the success or failure of the communication is known by inquiring whether or not there is a simultaneous notification from the communication partner.

In addition, the LAN connection control device is particularly
Problems around the transceiver that is directly connected to the N line are likely to cause problems and often cause communication failures. But,
Normally, the LAN connection control device itself has no means for detecting a fault around the transceiver.

[0004]

In the above-mentioned conventional method, the failure of the communication due to the failure of the LAN connection control device itself is known by the inquiry or the contact from the communication partner, and the time is delayed. Further, even when data including an error is transmitted due to a malfunction of the LAN connection control device itself, it is difficult to distinguish the error source from itself or the partner.

That is, in the broadcast mode communication, it is impossible to detect the occurrence of these failures by the acknowledgment and time monitoring based on the conventional communication control and perform error control.

[0006]

The object of the present invention is to provide LA
The data transmission signal transmitted and received by the N connection control unit itself is monitored,
LA that immediately detects a fault caused by itself without time delay
An N connection control device is provided.

Therefore, in the present invention, the processing device is connected to a local area network line (hereinafter, abbreviated as LAN line) to transmit / receive a data transmission signal.
The AN line connection control device includes a transceiver for transmitting / receiving a data transmission signal to / from the LAN line, a monitoring transceiver for monitoring a data transmission signal transmitted / received by the transceiver, and a transceiver for transmitting / receiving the transceiver. Comparing the address of the source and the destination included in the data transmission signal monitored by the transceiver for own with the own address held by the source,
An address comparison unit for identifying its own transmission data transmission signal and its own reception data transmission signal, transmission data transmitted from the transmission / reception transceiver and acquired from the data transmission signal monitored by the monitoring transceiver, and the transmission source itself. The transmission data to be checked, the transmission data check unit for detecting an error in the transmission data transmission signal, the data transmission signal received by the transceiver transceiver, and the data transmission signal received by the monitoring transceiver, respectively. A reception data check unit that collates the received data to be acquired and detects an error in the reception data transmission signal, and a communication protocol that performs communication control for an error in the transmission / reception data transmission signal detected by the transmission data check unit and the reception data check unit. And a data abnormality notifying section for notifying the.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

Referring to FIG. 1 showing a configuration of an embodiment of the present invention, a LAN connection control device is connected to a LAN line 1 and a transceiver 2 for transmitting and receiving a data transmission signal and a transceiver 2 for transmitting and receiving. The transceiver 3 for monitoring the data transmission signal to be transmitted and the address of the transmission source and the transmission destination included in the data transmission signal transmitted and received by the transmission and reception transceiver 2 are compared with the address of the transmission source itself, and the transmission and reception of data by itself is performed. Address comparison unit 5 for identifying a signal, transmission / reception transceiver 2 transmits, transmission data acquired from a data transmission signal monitored by a monitoring transceiver, and transmission data held by itself are collated to detect an error transmission The data check unit 7 and the data transmission signal received by the transceiver 2 are monitored by the monitoring transceiver 3. The received data check unit 8 for checking the received data acquired from the data transmission signal to detect an error, and the transmitted / received data error detected by the transmitted data check unit 7 and the received data check unit 8 for communication control. And a data abnormality notifying unit 9 for notifying the communication protocol 10 to perform.

To explain the operation of this embodiment, first, when the communication protocol unit 10 sends a transmission command to the LAN connection control unit, the transmission data check unit 7 holds the transmission data from the communication protocol unit 10. Then, the transmission data check unit 7 sends the transmission data to the transceiver 2 for transmission / reception, converts it into a data transmission signal, and transmits it to the LAN line 1. The monitoring transceiver 3 provided near the transmission / reception transceiver 2 monitors and receives the data transmission signal of the LAN line 1. The monitoring transceiver 3 acquires communication data from the data transmission signal and sends it to the address comparison unit 5. The address comparison unit 5 determines the source address included in the communication data,
By comparing with the address held by itself, it is identified as the communication data transmitted by itself. Then, the data is sent to the transmission data check unit 7, and the transmission data check unit 7 compares it with the held transmission data before transmission. The transmission data check unit 7 checks whether or not the data matches the communication data acquired from the data transmission signal, and if they match, the communication protocol 10 is notified that the communication is normally completed. If the pre-transmission data and the communication data acquired from the data transmission signal do not match, the transmission data check unit 7 notifies the data abnormality notifying unit 9, and the data abnormality notifying unit 9 performs error control corresponding to the content of the error in the communication protocol. Let 10 do it.

The operation when the transceiver transceiver receives the data transmission signal from the communication partner will be described below.
The monitoring transceiver 3 identifies the data transmission signal addressed to itself by the address comparison unit 5 and sends it to the reception data check unit 8. The reception data check unit 8 is the monitoring transceiver 3
The received data is compared with the data received by the transceiver transceiver 2, and if they match, the received data is sent to the communication protocol 10 as a normal reception, and the operation ends.

Next, referring to FIG. 2 showing the configuration of the second embodiment, an error control unit 11 for coping with an error detected by the transmission data check unit 7 and the reception data check unit 8.
To provide. Further, the error control unit 11 detects that the received data check unit 8 detects a mismatch between the received data and the transmission data retransmit unit 12 that controls retransmission for an error detected by the transmission data check unit 7. A received data resend request unit 13 that sends a received data resend request to the sender, and a cancel data communication unit 14 that notifies the communication partner of cancellation of the transmitted data when the transmitted data check unit 7 detects an error in the transmitted data. An unauthorized reception data discarding unit 14 that discards the reception data including an error in response to the unauthorized reception detected by the reception data check unit 8.

The operation of the second embodiment will be described. The transmission data transmitted from the transmission / reception transceiver 2 and received by the monitoring transceiver 3 is compared with the transmission data held in the transmission data check unit 7, and the transmission data is transmitted. When the data check unit 12 detects a mismatch, the cancel data transmission unit 14 notifies the cancel of the data transmission signal so that the communication partner does not mistakenly make the already transmitted data transmission signal into normal data. Then, the transmission data is immediately retransmitted from the transmission data retransmitting unit 12.

In the operation of receiving the data transmission signal, the monitoring transceiver 3 and the transmission / reception transceiver 2 are also provided.
The received data check unit 8 compares the data received by the received data, and when a mismatch is detected, the received data retransmission request unit 13
And the received data resend request unit 8 immediately requests the communication partner to resend. Then, the illegally received data discarding unit 15 discards the already received data.

The error control unit 11 provided in the LAN connection control unit controls the retransmission of the transmission data or the control of the request for re-reception of the reception data so that the presence / absence of the confirmation response by the communication control of the communication protocol or the monitoring time is used. It is possible to eliminate the delay in detecting a failure.

Next, referring to FIG. 3 showing the configuration of the third embodiment, monitoring transceivers 3 and 4 are provided. Then, the transmission data held by the transmission data check unit 7, the transmission data signal on the LAN line received by the monitoring transceivers 3 and 4, and a majority decision are used to determine whether the transmission data is normal. Further, during the reception operation, the reception data check unit 8 judges whether or not the data received by the transmission / reception transceiver 2 and the monitoring transceivers 3 and 4 is normal by a majority decision.

By judging whether or not the transceiver of the LAN connection control unit is normal in the transmission / reception operation by a majority decision, it becomes easy to isolate the fault between the communication partner and itself, and further improve the reliability of its own transceiver. You can

[0018]

As described above, according to the present invention, the fault detection means and the fault processing means for providing the fault detection of the LAN connection control unit connected to the LAN line to the physical layer instead of the communication control of the communication protocol. Thus, the processing of the communication protocol can be performed without any load, and the processing can be performed without delay due to time monitoring. Further, the illegal data is notified to itself or the communication partner by a physical level operation or discarded, and the processing of the communication protocol is further reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.

[Explanation of symbols]

 1 LAN Line 2 Transceiver Transceiver 3 Monitoring Transceiver 4 Monitoring Transceiver 5 Address Comparison Unit 6 Address Comparison Unit 7 Transmission Data Check Unit 8 Received Data Check Unit 9 Data Abnormality Notification Unit 10 Communication Protocol 11 Error Control Unit 12 Transmission Data Retransmission Unit 13 Receiving Data Retransmission Request Section 14 Canceling Data Sending Section 15 Unauthorized Reception Data Discarding Section

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masatsugu Koji 5-7-1, Shiba, Minato-ku, Tokyo Inside NEC Corporation (72) Inventor Miho 1137 23, Kamichitose-cho, Nagano-shi, Nagano Nagano-hi Inside the Denki Software Co., Ltd.

Claims (3)

[Claims] 1. A LAN line connection control device for connecting a processing device to a local area network line (hereinafter abbreviated as a LAN line) and transmitting and receiving a data transmission signal, transmits and receives a data transmission signal to and from the LAN line. A transceiver for transmitting and receiving, a transceiver for monitoring a data transmission signal transmitted and received by the transceiver, and a transmitter and a receiver included in the data transmission signal transmitted and received by the transceiver and monitored by the transceiver. An address comparison unit that compares an address with its own address held by the transmission source to identify its own transmission data transmission signal and its own reception data transmission signal; and the transmission / reception transceiver transmits and monitors by a monitoring transceiver. Data to be transmitted from the transmitted data transmission signal and the transmission source It collates the transmission data only to hold, and a transmission data checking unit for detecting errors in the transmitted data transmission signals, and a data transmission signal the transceiver transceiver receives,
A data transmission signal received by the monitoring transceiver,
The received data check unit that compares the received data acquired from each and detects the error of the received data transmission signal, and the communication control of the error of the transmission / reception data transmission signal detected by the transmission data check unit and the reception data check unit. A LAN connection control device, comprising: a data abnormality notifying unit for notifying a communication protocol to perform. 2. When the transmission data check unit detects an error in a data transmission signal of the transmission data, transmission of cancellation data for notifying a destination of reception cancellation of the data transmission signal, retransmission of the transmission data, and reception data When the check unit detects an error in the received data transmission signal, the check unit includes an error control unit that discards the received data by the data transmission signal and requests the source of the data transmission signal to retransmit the received data. And L according to claim 1.
AN line connection control device. 3. Two monitoring transceivers for monitoring a data transmission signal of a LAN line, an address comparing unit connected to each of the monitoring transceivers for identifying a data transmission signal to be transmitted and received, and the two monitorings. Transmission data check unit for inspecting the respective transmission data of the two data transmission signals received by the transceiver transceiver and the held transmission data by majority, and the data transmission signal received by the two monitoring transceivers and the transmission / reception 2. The LAN line connection control device according to claim 1, further comprising: a reception data check unit for inspecting the reception data, which is acquired from each of the data transmission signals received by the transceiver for each, by the majority decision by the reception data check unit.