JPH03145848A - Line monitor system - Google Patents

Abstract

PURPOSE:To quickly collect a fault monitor data when a MODEM detects a fault by adopting a different constitution for normal monitor data occurred frequency normally from a monitor data caused on the occurrence of the fault and decreasing the data length of the data. CONSTITUTION:The constitution of a response in the normal state and that on the occurrence of a fault are made different and since the normal response is one kind, the data length t2 is selected to be nearly 1/2 of those of t1 in comparison with fault response forms of nearly 10 kinds. Since much of response is normal in the normal state, the transmission time of the response is decreased to nearly a half. Thus, when a fault is detected in a MODEM, the fault response is received from the MODEM faster than a conventional system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line monitoring system for a modem (hereinafter referred to as a modem) that performs transmission via a communication line.

[Summary of the invention]

The scale of data communication systems continues to expand, and reliability is becoming more important.
Transmission equipment is also required to have high reliability. A recent trend is to add a line monitoring function to a transmission device, collect monitoring data with a single line monitoring device, perform preventive maintenance on the data transmission line, and improve the reliability of the system.

It is desirable to collect such monitoring data as quickly as possible for early detection of failures. However, since the transmission of monitoring data between the modems, which are transmission devices, uses the secondary channel of the transmission line, the speed is usually about 75 b/s, making it difficult to quickly transmit the monitoring data. Therefore, in the present invention, normal monitoring data, which normally occurs in large numbers, is made shorter than monitoring data when a failure occurs, so that failure monitoring data can be collected quickly.

[Conventional technology]

Figure 2 shows a schematic diagram of the line monitoring system. In the figure, reference numeral 1 denotes a network composed of a modem, a transmission line, a terminal device, and the like. 2 is an intermediate device that aggregates modem lines, and 3 is a line monitoring device that manages the network. Failure monitoring between modems in this system is performed as follows. That is, the modem M connected at the highest level sends a command to the modem S1 at the lower level, and Sl returns a response as a result of monitoring. When M receives the response from Sl, it sends a command to S2. When 1M also receives a response from S2, it sends a command to S3. Thereafter, the process repeats the same process until the end when commands and responses are sent and received, and then returns to S1. M sends the response received in this way to one line monitoring device 3 via the intermediate device 2.
to be transmitted.

FIG. 3 shows the above-mentioned M, Sl, S2. S3. ...
. . . A time chart is shown for the conventional method of sending and receiving commands and responses. Previously, the structure of both the response in the case of normality and the response in the case of failure did not change (responses of length tl were returned. In the case of failure responses, tl was used to distinguish between about 10 types of failure factors. tl has to be long to some extent because of the need to send commands to the modem.For this reason, in the conventional method, even if a failure is detected in a certain modem, it takes time to send commands to that modem, and it takes time until the failure can be detected. The disadvantage was that it took a long time.

[Problem to be solved by the invention]

In the conventional method, the response in the case of normality and the response in case of failure were the same length.

It took a long time to send a response back. Therefore, even if the modem detects a fault, it takes a long time to receive it as a response, resulting in a delay in detecting the fault. SUMMARY OF THE INVENTION In order to solve these drawbacks, it is an object of the present invention to quickly detect a failure by allowing the modem to quickly receive it as a response when it detects a failure.

[Means to solve the problem]

In order to achieve the above-mentioned objects, the present invention (2) normal monitoring data, which normally occurs in large numbers, has a shorter data length by changing the structure of the monitoring data when a failure occurs.

[Effect]

As a result, if a modem detects a failure, commands can be sent to the modem quickly.
Failures can be detected faster.

〔Example〕

M and Sl in FIG. 2 according to the invention, S2. S3.・
. . . A time chart of the method of transmitting and receiving commands and responses is shown in FIG. 1. This operation will be described below. The method of monitoring failures is the same as the conventional method.

The difference is Sl, 82.83. The structure of the response from ``normal'' and the response when there is a failure was changed, and the length of the response was changed. Since there is only one type of normal response, the data length t2 should be approximately 1 of tl compared to the approximately 10 types of failure responses.
/2. Moreover, since a large number of responses is normal under normal circumstances, the response transmission time can be reduced to approximately 1/2. Therefore, when a failure is detected in a modem, the modem responds to the failure more quickly than in the conventional method. can be received.

〔Effect of the invention〕

As described above, according to the present invention, the configuration of the fault monitoring response is changed between normal cases and faulty cases, and the response length in normal cases is shortened, so that when the modem detects a fault, It becomes possible to quickly collect failure monitoring data.

[Brief explanation of the drawing]

FIG. 1 shows a time chart according to the present invention, FIG. 2 shows a line monitoring system, and FIG. 3 shows a time chart according to a conventional system. 1: Network, 2: Intermediate device, 3: Line monitoring device.

Claims (1)

[Claims] 1. In a line monitoring system consisting of a modem that is equipped with a line characteristic measurement circuit for multiple items and has the function of monitoring the line status, whether a failure is detected in the modem or not;
Or, when transmitting normality information to the line monitoring management device, change the data structure when a failure is detected and when it is normal, and reduce the length of the data when it is normal compared to when a failure is detected. A line monitoring method characterized by a shortened line.