JPH0272742A - Data error location detecting system - Google Patents

Abstract

PURPOSE:To detect at anearly stage in which ring station a data error occurs by collecting data error information in each ring station and monitoring the station from which no response is received by a monitor station. CONSTITUTION:The monitor station 10 transmits data for state collection periodically from a transmission part 14 to each ring station. The ring station 20, when detecting the receipt of the data for state collection, transmits monitor data to the monitor station 10. The monitor station 10 receives the monitor data, and a response part 13 sends a response signal to the ring station 20 from which the monitor data is sent. Such sequence is performed with each ring station periodically. When no monitor data is sent from the ring station 20 in spite of the transmission of the data for state collection from the monitor station 10, it is recognized as a faulty stationy, and the station is displayed on a display part 16.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a loop local area network (LAN).
), the present invention relates to a ring communication system such as a data exchange that performs communication using the token ring method, and particularly relates to a data error location detection method for searching for a fault location in a transmission path and a ring station.

[Conventional technology]

Conventionally, in a token ring type communication system, when a data error occurs in a transmission path or a ring station, the data is saved by retransmission control, so that even a minor failure is not detected.

[Problem to be solved by the invention]

In the conventional token ring communication system,
The frequency of data errors that occur in the transmission path or ring station is low, and the number of data retransmissions increases, causing a negative impact on the system, but the failure is not reported, so it is possible to identify the location where the failure occurs. The disadvantage is that it is difficult to search for

[Means to solve the problem]

The data error occurrence location detection method of the present invention is applicable to a ring communication system in which a monitoring station and a plurality of ring stations are connected in a ring through a transmission path and communicate in a token ring manner, from the monitoring station that monitors the status of the ring station to the Status collection data is periodically sent to each of the ring stations, each of the ring stations that has received the status collection data returns its own station monitoring information to the monitoring station, and the monitoring station The system analyzes monitoring information and detects locations where data errors occur.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a communication system according to an embodiment of the present invention. This system connects a monitoring station 10 that monitors ring stations and a plurality of ring stations 20 through a transmission path 30,
A terminal 40 is connected to each ring station and controls communications between these terminals.

FIG. 2 shows the configuration of a monitoring station that monitors ring stations, and the monitoring station 10 includes a token ring interface 11, a status collection data transmitting section 14, a monitoring data receiving section 12,
It is comprised of a monitoring data reception response section 13 that transmits a response signal of a monitoring take sent from a ring station, a status monitoring data processing and control section 15, and a display section 16 that displays failure details.

FIG. 3 shows the configuration of each ring station, and the ring station 20 has a token ring interface 21 and a general data receiving section 2.
2, a general data transmission unit 25, a communication control unit 26 that controls each of the terminals 40, a detection unit 23 for status collection data sent from the monitoring station, and a transmission unit 24 for monitoring data of the own station. , and a monitoring data response confirmation unit 28 that confirms that the monitoring station has received the monitoring data.

Next, the operation of this system will be explained. The monitoring station 10 periodically sends status collection data to each ring station 20 through the transmitter 1.
Send from 4. In the ring station 20, the detection unit 23 detects that the status collection take has been received. Here, transmitter 2
4, transmission path information (CRC error occurrence count, retransmission data count, etc.) is always collected from the token ring interface 21, and this monitoring data is transmitted to the monitoring station 10 according to instructions from the detection unit 23. The monitoring station 10 receives monitoring data at the receiving section 12 and transfers the data to the control section 15. At this time, the receiving section 12 activates the responding section 13 to send a response signal to the ring station 20 that has sent the monitoring data. The response signal sent from the response unit 13 is sent to the ring station 20.
The confirmation unit 28 of the communication control unit 26 recognizes the reception.

The monitoring data collection sequence for one ring station 20 ends. Note that this sequence is periodically performed with each ring station.

The method for recognizing the location of a data error is as follows.

(1) Transmission error information of monitoring data: The monitoring station 10 determines the location of the error occurrence based on which ring station 20 counts the number of errors in the monitoring data sent from each ring station. Display the contents.

(2) No response to monitoring data: Even though the monitoring station 10 sent status collection data,
When the monitoring data was sent from the ring station 20,
The ring station 20 that does not respond is recognized as a faulty station, and the monitoring station 10
is displayed on the display section 16 of.

Furthermore, in this embodiment, the following operations are performed to ensure that monitoring data collection is performed accurately.

(1) When monitoring data is destroyed: When the monitoring data sent back from the ring station 20 to the monitoring station 10 is destroyed, the monitoring data response signal from the monitoring station 10 does not come to the ring station 20, so the monitoring data is sent back to the monitoring station 10. Resend until there is a response.

(2) When the monitoring response signal is destroyed: When the monitoring data response signal from the monitoring station 10 to the ring station 20 is destroyed, the ring station 20 retransmits the monitoring take. Therefore, the monitoring station 10 transmits the response signal again.

〔Effect of the invention〕

As explained above, according to the present invention, the monitoring station collects data error information of each ring station and monitors non-responsive stations, thereby determining in which ring station a data error is occurring. can be detected early.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are configuration diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Monitoring station, 20... Ring station, 30... Transmission path, 40... Terminal, 11... Token ring interface, 12... Monitoring data receiving unit, 13...
Monitoring data reception response transmitter, 14... Status collection data transmitter, 15... Status monitoring data processing and control unit,
16...Display unit, 21...Token ring interface. 22... General data receiving section, 23... Status collection data detecting section, 24... Monitoring data transmitting section, 25... General data transmitting section% 26... Communication control section, 28...
Monitoring data response confirmation section. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a ring communication system in which a monitoring station and a plurality of ring stations are connected in a ring through a transmission path and communicate using a token ring method, the monitoring station that monitors the status of the ring station periodically sends status information to each of the ring stations. Each of the ring stations that has sent the collection data and received the status collection data returns its own station monitoring information to the monitoring station, and the monitoring station analyzes the returned monitoring information and determines whether a data error has occurred. A data error occurrence location detection method characterized by detecting the location.