JPH05344119A - Alarm protecting/suppressing system - Google Patents

Abstract

PURPOSE:To easily specify a fault position by suppressing the generation of excess alarms in a digital multiplexer at the time of generating line alarms by changing alarm detection sensitivity corresponding to line states or the like concerning the alarm protecting/suppressing system for informing line faults or device faults in a digital communication system or the like. CONSTITUTION:A control bus 5 is provided between a network side line housing part 1 and terminal side line housing parts 2-1-2-n and the network side line housing part 1 generates an alarm detection clock and sends it to the control bus 5 so as to change or set a clock cycle even during device operations. The terminal side line housing parts 2-1-2-n perform alarm detection at the timing of the alarm detection clock and when the alarms are continuously detected for prescribed times, an alarm information signal is sent to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a digital communication system or the like, prevents an excessive alarm from occurring in the digital multiplexer when a line failure occurs, and also increases the alarm detection sensitivity to the line state or the like. The present invention relates to an alarm protection / suppression method that can be changed depending on the situation.

In recent years, with the enormous size and complexity of communication networks, early detection and handling of network failures are required. Therefore, when a primary alarm with a higher priority spreads to another and generates a secondary alarm, the secondary alarm must be suppressed in order to prioritize and handle the primary alarm that is the root of the failure. I have to. Further, if the alarm detection sensitivity can be changed according to the line condition, etc., unnecessary frequent alarms can be prevented and the overload of the monitoring control device can be prevented.

[0003]

2. Description of the Related Art FIG. 3 is a diagram showing a digital multiplexer to which an alarm protection / suppression method of the present invention is applied.

In FIG. 3, 1 is a network side line accommodating unit, 2-1 to 2-n are terminal side line accommodating units, 3 is a device control unit, 4 is an in-device data bus, 5 is an in-device control bus, and 6 Are network side lines, and 7-1 to 7-n are terminal side lines.

The network side line accommodating unit 1 receives a digital signal in which n channels are time-division multiplexed from the network side line 6, demultiplexes into n channel data, and n pieces of data are transmitted via the data bus 4. Terminal side line accommodation unit 2-
Send to 1-2-n. The terminal side line accommodating units 2-1 to 2-n send the separated 1-channel data to the terminal side lines 7-1 to 7-n. Each of the line accommodating units 1, 2-1 to 2-n has a fault monitoring unit 11, 21 respectively, which monitors received data to detect a line abnormality, and also detects a fault of its own individual device. Then, an alarm is generated for the corresponding monitoring item and the device control unit 3 is notified via the control bus 5. The device control unit 3 edits the notified alarm information and turns on an alarm lamp or sends an alarm to the host monitoring device.

In the conventional multiplexer, when a line failure occurs in the network side line 6, an alarm is generated in the network side line accommodating section 1 such as "out of sync", and the failure spreads to terminals. The "out-of-sync" alarms are simultaneously generated in the side line accommodating units 2-1 to 2-n. All these alarms are independently transmitted to the device controller 3 via the control bus 5. That is, with respect to a line failure on the higher-order group side, an alarm is also generated in the plurality of line accommodation units on the lower-order group side configured by separating the higher-order group, and the device control unit 3 is notified. In addition, the failure detection unit 21 of each line accommodation unit
Has its own alarm protection time set individually and fixedly, and the alarm detection sensitivity is fixed. Therefore, for all the generated alarms, if the alarm signal continues for the protection time or longer, it is uniformly determined that the alarm is generated or the alarm is recovered, and the alarm is notified to the outside.

[0007]

In the above-mentioned prior art, when a failure occurs in the network side line, a number of alarms are generated from each section for the same failure and the apparatus control section is notified, so that the alarm information is monitored. Congested in the system. Also, since the alarm detection sensitivity (alarm protection time) is preset and set to the unique value of each container,
When the line quality is poor, the frequency of occurrence of alarms in the terminal side line accommodating unit increases, and alarm information is congested more than necessary. For these reasons, the load of the control and monitoring device increases, and it takes time to identify the failure point.

The present invention was made in view of the above problems, and in a multiplexer for multiplexing a plurality of terminal side lines and connecting to the network side line, alarm detection sensitivity (alarm detection protection in the terminal side line accommodating portion). Time) can be set arbitrarily during device operation, and when a failure occurs on the network side line, the occurrence of a secondary alarm in the terminal side line accommodating unit caused by the failure prevents the failure. The purpose is to make it easy to identify the location.

[0009]

FIG. 1 is a diagram showing an alarm protection / suppression system according to the present invention. The above-mentioned problem is, as shown in FIG. 1, a network side line accommodating unit in a digital multiplexing apparatus for separating a multiplexed signal from a network side line 6 and transmitting it to a plurality of terminal side lines 7-1 to 7-n. 1, a control bus 5 is provided between the terminal side line accommodating section 2-1 to 2-n,
The network side line accommodating unit 1 generates an alarm detection clock whose clock period can be changed and set even while the device is operating and sends it to the control bus 5, and the terminal side line accommodating units 2-1 to 2-
In the alarm protection / suppression system of the present invention, n is adapted to detect an alarm at the timing of the alarm detection clock and to send an alarm notification signal to the outside when the alarm is detected a predetermined number of times in succession. Will be resolved.

[0010]

The alarm detection operation in the terminal side line accommodating section is performed at the cycle of the alarm detection clock from the network side line accommodating section, and the cycle can be changed in the network side line accommodating section. Therefore, when a failure occurs on the network side line, if the cycle of the alarm detection clock is set to infinity, the terminal side line accommodating unit will not detect the alarm, so the transmission of the secondary alarm will be masked. Therefore, it is possible to avoid congestion of alarms for the same line failure.

Further, when the quality of the network side line is poor, the alarm detection protection time can be set according to the line quality by changing the cycle of the timing clock. Therefore, the frequency of alarm detection can be suppressed to the necessary minimum, and it is possible to avoid taking a long time to identify a failure point due to overload of the monitoring control device.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing an alarm protection / suppression system of the present invention,
FIG. 2 is a time chart showing the alarm detection operation of the terminal side line accommodating section. Note that the same reference numeral represents the same object throughout the drawings.

FIG. 1 is a diagram for explaining the configuration of an internal bus and a function added when the present invention is applied to the digital multiplexing device described above with reference to FIG. Only one is represented.

In FIG. 1, the internal data bus 4 of the present invention comprises a total of eight data bits 41 for transmitting the demultiplexed main signal and one parity bit for checking an error in the main signal transmission. 9 bits are provided.
The control bus 5 is also provided with a 1-bit alarm detection clock transmission line 53 and a 1-bit clock valid bit line 54. In addition to the conventional fault monitoring unit 11, the network side line accommodation unit 1 also generates an alarm detection clock of a cycle set by the device control unit 3 and sends the alarm detection clock to the alarm detection clock transmission line 43. A clock generation unit 12 and a clock valid bit setting unit 13 that sets a clock valid bit to “0” when a fault occurrence alarm of a network side line is notified from the fault monitoring unit 11 and restores the bit to “1” when restored. To provide. Further, in the fault monitoring unit 21 of each of the terminal side line accommodating units 2-1 to 2-n, a fault detecting unit 21a that detects a line fault and issues an alarm, and a clock valid bit are set to "1". The alarm detection unit 21b detects an alarm in synchronism with the alarm detection clock only when the alarm detection clock is generated. And an Alamou protection unit 21c for notifying the user.

The device control unit 3 sets a predetermined clock period in the alarm detection clock generation unit 12 of each network side line accommodating unit 1 at the time of starting the device. This cycle is number 1
0 ms to several tens of seconds and ∞ can be set, and an appropriate value is set for each in accordance with the line quality and the like. Further, the clock valid bit setting unit 13 sets the clock valid bit to "1".
Set to. As a result, each terminal side line accommodating section 2-1 to 2-
The alarm detector 21b of n detects an alarm at a cycle interval of the alarm detection clock. And, even if the alarm occurrence signal from the failure detection unit 21 becomes "H", the alarm protection unit
If the number n of alarm detection pulses set in 21 does not occur consecutively, no external alarm notification is given. That is, the alarm detection protection time of only the alarm detection clock cycle × n is provided. Therefore, if the clock cycle is set according to the state of the system such as the line quality, the detection of the secondary alarm can be suppressed.

The network side line accommodating section 1 monitors the data received from the network side line by the alarm monitoring section 11, and when a line failure is detected, the clock valid bit setting section 12 is notified and the device control section is notified. Notice.
Also, the clock valid bit setting unit 12 is an alarm valid bit.
Set “0” to 54. Based on the alarm occurrence notification, the device control unit sets a longer period than the initially set period in the alarm detection clock generation unit 13 of the network side line accommodation unit 1.

On the other hand, in the terminal side line accommodating section 21, the fault detecting section 21a monitors the data received from the 8-bit data bus, and when a fault is detected, an alarm is generated. However, since the clock valid bit is "0" in the alarm detection unit, it is determined that the higher level failure has spread, the alarm detection clock is invalidated, and the alarm is not detected. Therefore, the alarm notification to the device control unit is suppressed.

Further, as shown in FIG. 2, if "1" is set in the clock valid bit, it is judged not to be the spread of the upper alarm, but to be the fault after the data bus or the fault of the own device (individual fault) Alarm detection is performed on the alarm generation signal at the set alarm detection clock timing and an alarm detection pulse is generated. When the alarm detection pulse is generated n times (three times in the figure) in a row, the alarm protection unit sends an alarm notification signal to the device control unit via the control bus. As shown in a and b in the figure, the alarm notification signal is not sent even if the alarm generation signal has an alarm within the protection time. This protection time can be arbitrarily adjusted to the system state by changing the cycle of the alarm detection clock. It can be set appropriately.

[0019]

As is apparent from the above description, according to the present invention, the alarm detection sensitivity can be changed according to the state of the line, and the alarm regarding the fault occurring on the upstream side of the line can be detected on the downstream side. Since no notification is given from the line accommodating unit, it is possible to avoid the alarm congestion at the time of failure occurrence and to quickly identify the failure occurrence location.

[Brief description of drawings]

FIG. 1 illustrates an alarm protection / suppression scheme of the present invention.

FIG. 2 is a time chart showing the alarm detection operation of the terminal side line accommodating unit.

FIG. 3 is a block diagram of a digital multiplexing device to which an alarm protection / suppression method of the present invention is applied.

[Explanation of Codes] 1-Network side line accommodation unit, 11-Fault monitoring unit, 12 ...
Clock valid bit setting unit, 13 ... Alarm detection clock generation unit, 2-1 to 2-n--Terminal side line accommodation unit, 21--Fault monitoring unit, 21a ... Fault detection unit, 21b ... Alarm detection unit, 21c ...
Alarm protection unit, 3 ... Device control unit, 4 ... In-device data bus, 5-In-device control bus, 6- Network side line, 7-
1 to 7-n-Terminal side line

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04L 29/14 H04Q 1/446 A 9076-5K

Claims (1)

[Claims] 1. A digital multiplexing apparatus for separating a multiplexed signal from a network side line (6) and sending it to a plurality of terminal side lines (7-1 to 7-n), wherein a network side line accommodation section ( 1) and terminal side line accommodation (2
-1 to 2-n), a control bus (5) is provided, and the network side line accommodating unit (1) generates an alarm detection clock whose clock period can be changed and set even while the device is operating, and generates the control bus. (5), and the terminal side line accommodating unit (2-1 to 2-n) performs alarm detection at the timing of the alarm detection clock, and outputs an alarm notification signal when the alarm is detected a predetermined number of times in succession. Alarm protection / suppression method characterized by being sent to the.