JPH0279541A - Modem with log function - Google Patents

Abstract

PURPOSE:To easily discriminate whether an alarm is an alarm before a fault or an alarm issued newly after the recovery of the fault by giving time information to the alarm. CONSTITUTION:When data transmission is implemented from a HOST 1 to an opposite station 5, if a communication fault takes place in a part of an exclusive communication line 7A and the communication is disabled, a monitoring section 8 detects it to activate an alarm 9 to raise an alarm. In this case, time information is extracted from a clock 10 together with the alarm and they are stored temporarily in the monitoring section 8. When the communication fault is restored and the communication is enabled, an NSP(network interface processor) 4 references the stored time information and alarm. Thus, the fault occurrence time and the fault consecution time or the like are easily recognized by deciding the sent alarm and time information after the restoration of the fault.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 5) Means for solving the problems to be solved by the invention (Figure 1) Working examples (Figure 2) ~Figure 4) Effects of the invention [Summary] Regarding a modem with a logging function, the purpose is to output time information when a communication failure is detected, and to monitor failures in a communication network equipped with a modem and a communication device. In a communication device having a management control means, a monitoring means for monitoring communication failures is provided in the modem or an adapter externally attached to the modem, and a clock for generating time information when a communication failure is detected, and the time information at the time of communication failure is provided. Configure to output.

[Industrial application field]

The present invention relates to a modem with a log (time information) function, and in particular,
The present invention relates to a modem with a log function that allows time information to be outputted in the modem together with an alarm for the failure when there is a failure in a line network, thereby facilitating management control.

[Conventional technology]

FIG. 5 is a block diagram schematically showing a conventionally used modem network management system (MDMS).

The HO3T (host station) 50 is equipped with a modem (modem) 51 for modulation and demodulation, an NIP (network interface processor) 52, and an N5P (management control processor) 54, and the other station (for example, a terminal device) 55 includes: A modem (modulation/demodulation device) 56 is provided, and a communication line 58 connects the modems 51 and 56.
0 and the other party's station 55.

Suppose that an abnormality occurs in the network, such as a communication line failure, during communication.

This abnormal condition is detected by the modem and generates an alarm.

In this case, the alarm emitted from the modem 56 cannot be transmitted to the modem 51 if the communication line 58 continues to fail, so the alarm does not reach the N5P 54.

Therefore, the alarm remains in the modem 56 and accumulates (alarm information is stored in a memory, for example).

Thereafter, when the line failure is restored, the N5P 54 sucks up the alarm information accumulated in the modem 56.

In this way, at the time of failure recovery, the alarm information accumulated in the modem 56 is sent to the modem 51 via the communication line 58, and then sent to the N5P 54 via the NrP 52, where the alarm information sent here is sent to the modem 51 via the communication line 58. It makes judgments and performs various management and controls.

Note that the alarm is generated not only in the modem 56 but also in the HO3T.
It is also output from the modem 51 on the 50 side.

Furthermore, an alarm is generated not only when there is a failure in the communication line 58 (but also when there is a failure in other parts of the network).

[Problem to be solved by the invention]

The above-mentioned conventional devices had the following drawbacks.

(11 After the failure is recovered, the fact that there was a failure is revealed by judging the alarm information sent to the N5P54, but is it an alarm that was stored before the failure was recovered, or was it issued before the failure was recovered? I couldn't tell if it was an alarm or not.

(2) Failure information could not be managed adequately because there was no time information such as the time of failure occurrence or the duration of the failure.

The present invention solves these conventional drawbacks, makes it possible to easily determine whether an alarm was issued before failure recovery or a new alarm issued after failure recovery, and uses time information. The purpose of this is to make management and control easier by making it easier to determine the time when a failure occurs, the duration of the failure, etc.

[Means to solve the problem]

In order to achieve the above object, the present invention is as follows.

FIG. 1 is a diagram showing the principle of a modem with a log (time information) function according to the present invention, and the present invention will be explained in detail below based on this diagram.

Normal communication is carried out between a HO3T (host station) 1 and a partner station (for example, a terminal device) 5 using a modem (modulation/demodulation device) 2.
6 and communication line 7.

Now, suppose that, for example, when the HO3TI is transmitting data to the partner station 5, a failure occurs in a part of the communication line 7, and communication between the HO3TI and the partner station 5 becomes impossible.

At this time, the failure is detected in the modem 6 by monitoring by the monitoring section 8, and the alarm 9 is activated to generate an alarm.

The time of occurrence of this alarm can be determined by the clock 10, so
The time information from the clock 10 and the alarm are stored together in the monitoring section 8 (at this time, the information cannot be transmitted because there is a failure in the communication line).

Next, when the above-mentioned failure is restored and communication between the HO3TI and the partner station 5 becomes possible, the time information and alarms stored in the monitoring section 8 are transmitted to the HO3TI side.

This information passes through the monitoring section 11 in the modem 2 and passes through the NIP
(Network Interface Processor) 3 and then to N5P (Management Control Processor) 4.

N5P4 judges the sent alarm and time information, learns the time of failure, the duration of 1 meter of failure, etc., and performs various management controls.

The alarm 12 and clock 13 in the modem 2 generate an alarm and time information in response to a failure detected by the monitoring unit 11, and transmit the alarm and time information to the N5P4.

[Effect]

With the above configuration, after failure recovery, by determining the sent alarm and time information,
You can easily know the time when the failure occurred, the duration of the failure, etc.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Second
The figure shows a modem with a log function, which is an embodiment of the present invention.

HO3T (host station) 1 has a modem (modem/demodulator) 2
, NIP (Network Interface Processor) 3, and NSP (Management Control Processor).

In addition to the modem 2, a number of modems (not shown) are connected to the NIP 3, and perform various information processing between the NSP and the modem.

In addition, the modem 2 is connected to the other station (for example, a terminal device) 5.
A modem 6 having the same structure is connected.

In these modems 2 and 6, modem sections 14.15,
A monitoring unit 8.11, an alarm 9.12 and a clock 10.13 are provided.

7A is a dedicated communication line, and through this line HO3T
Communication is performed between I and the partner station 5.

In this case, the modulation and demodulation units 14 and 15 perform modulation and demodulation to perform communication such as data transmission, but the monitoring units 8 and 11 monitor communication failures in the entire transmission network.

Now, for example, suppose that when data is being transmitted from the HO3TI to the partner station 5, a communication failure occurs in a part of the dedicated communication line 7A, making communication impossible.

This failure is immediately detected by the monitoring unit 8 and activates the alarm 9 to issue an alarm. However, this alarm
As long as the fault continues, it cannot be transmitted to HO3T1, so this alarm cannot be notified to N5P4.

At this time, along with the alarm, time information (
(failure occurrence time, etc.) is extracted and temporarily stored in the monitoring unit 8. This accumulation can be done using a register or memory.

Additionally, the alarm remains on while the fault continues.

Thereafter, when the communication failure is recovered and communication becomes possible, the N5P4 absorbs the time information and alarms accumulated as described above.

That is, time information (failure occurrence and end time, etc.) and alarms are transmitted from the monitoring unit 8 to the dedicated communication line 7 as shown by the dotted line in the figure.
It is transmitted along the route A→monitoring unit 11-NIP3-N5P4 and notified to N5P4.

Upon receiving this notification, the N5P4 judges the time information and the alarm and uses it for subsequent management control.

In addition to the above-mentioned failure, when the monitoring unit 11 detects a failure occurring in another part, for example, a failure in the modem 2, an alarm is generated by the alarm 12, and time information is generated by the clock 13. and the NIP via the monitoring unit 11.
3, time information and alarm are notified to N5P4.

FIGS. 3 and 4 are diagrams showing other embodiments of the present invention.

This embodiment is an example in which a backup device is added to the modem, a dedicated communication line is used for normal communication, and communication is switched to a public telephone line when a failure occurs.

FIG. 3 is a schematic configuration diagram of a modem and a backup device, where 30 is a modem (modulator/demodulator) and 31 is a backup device added to the modem 30.

Normal communication is performed using the dedicated communication line 7A with contacts R1 to R3 of relays and the like located at the positions indicated by solid lines in the figure.

During this communication, the processor 32 receives quality information extracted from demodulated data in the modem 30 and determines the communication quality.

For example, if a communication failure occurs in a part of the dedicated line, this failure is immediately detected by the processor 32, and failure information is sent to the processor 33 in the bankup device 31.

When this processor 33 receives the fault information,
A relay or the like is operated to switch the contacts R1 to R3 from the solid line position shown in the figure to the dotted line position.

Thereby, the modem 30 and the dedicated communication line 7A are disconnected and connected to the public telephone line 7B side.

At the same time, a control signal is issued from the processor 33 and sent to the NCU (network control unit) 34 and the signal generator 35.

The NCU 34 establishes a connection with the other party by automatic calling or the like, and enables continuous communication using the public telephone line 7B.

Further, the signal generating section 35 outputs a test signal and transmits it to the partner station, and the test signal sent from the partner station is taken into the signal quality determining section 36 and judged.

Thereafter, when the fault is recovered, the signal quality determination unit 36 outputs a signal indicating that the fault has been recovered as fault information, and sends it to the processor 33.

The processor 33 switches the contacts R1 to R3 as indicated by the dotted lines in the figure to resume communication via the dedicated communication line 7A, and also sends a signal to the NCU 34 to disconnect the public telephone line 7B.

Note that the above-mentioned bank amplifier device has the same device added to both modems that perform communication.

Figure 4 shows a case where a failure occurs while communicating on a dedicated communication line using a modem equipped with a bank-up device as shown in Figure 3, and communication is switched to a public telephone line. This is an example in which the backup device is omitted.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

Now, suppose that a fault occurs in a part of the dedicated communication line 7A shown in Figure 3 while communicating, and after this fault is detected, the switch is made to the public telephone line 7B. Communication continues.

The above fault information is also notified to and detected by the monitoring section 8 in the modem 6 in FIG. 4, for example. At this time, time information such as the failure occurrence time is issued from the clock 10 and sent to the monitoring section 8.

In this case, since communication via the public telephone line 7B continues, the above time information is sent to the monitoring unit 11 in the modem 2 on the HO5TI side via the public telephone line &%7B, and is further transmitted via the NIP3. and sent to N5P4.

This continues until the fault is recovered and the dedicated communication line is switched over again. That is, the time information during backup is sent from the monitoring unit 8 to the N5P4 via the monitoring unit 11 and the NIP3.

In addition, regarding a failure detected by the monitoring unit 11 in the modem 2, time information from the clock 13 is sent to the N5P4.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(1) Since time information is attached to the alarm, it is easy to determine whether it is an alarm from before the failure or a new alarm issued after the failure has been recovered.

Therefore, subsequent management, control, etc. become easier.

(2) During backup using public telephone lines in the event of a failure,
Since time information can be notified, it is possible to calculate charges for public telephone lines.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanation of the present invention. FIG. 2 is a block diagram of a first embodiment of the present invention. FIGS. 3 and 4 are block diagrams of a second embodiment of the present invention. FIG. 5 is a conventional example. 1.-H03T (host station) 2.6.3 (1-M OD E M (modulator/demodulator)
3--NIP (Network Interface Processor) 4-N S P (Management Control Processor) 5- Partner station
7-Communication line 7 A-11 dedicated communication line 7B-・Public phone line 8
．． 11--Monitoring section 9.12-Alarm 10.1
3.--Clock 14.15-Modulation/demodulation unit 31-Bank amplifier device Patent applicant Fujitsu Limited Patent attorney Akira Yamatani Sakae Ri

Claims (1)

[Claims] (1) In a communication network equipped with a modem (MODEM) and a communication device that has a management control means (NSP) that monitors communication device failures, communication failures are monitored within the modem or within an adapter externally attached to the modem. A modem with a log function characterized in that it is provided with a monitoring means (8) and a clock (10) that generates time information when a communication failure is detected, and is configured to be able to output time information when a communication failure is detected.