JPH09214502A - Alarm notice system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly inform device abnormality without effecting a network protocol in a multiplex device having a network monitor function by means of the LAN protocol of TCP/IP and the like. SOLUTION: In this system, plural multiplex devices #1-#3 are cascade- connected in a time divisional multiplex communication system and the device of alarms on a device fault, which are outputted from the respective multiplex devices #1-#3, are given to the network monitor device through transmission lines 1 and 2. If a device fault does not occur in the self device when the device fault from the other multiplex device among the multiplex devices #1-#3 is received with a device address showing the fault device, the device address is transmitted to the next multiplex device. When the device fault occurs in the self device, the device address is held and the device address of the self device is transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm notification system for a time-division multiplexing apparatus, and more particularly, to an alarm notification system for a low-speed transmission line.
The present invention relates to an alarm notification method useful for network monitoring and control of a LAN protocol such as TCP / IP.

[0002]

2. Description of the Related Art In a network of a time division multiplex communication system configuration in which unmanned relay stations and terminal stations are connected, when a failure occurs in a relay station or terminal station, an alarm notification regarding the failure is transmitted. Centralized monitoring is performed by notifying a network monitoring device (NMS) installed in a manned center station via a road. For alarm notification, an alarm transfer bit is provided along with the main signal in the frame configuration of the time division multiplexed signal on the transmission path. At this time, if the transmission path is slow, TCP /
Network monitoring device for LAN protocol such as IP (N
The control path for MS) is also slow.

[0003] When an abnormality such as a device failure occurs in a relay station or a terminal station, the device notifies the upstream network monitoring device of a TRAP, thereby notifying the abnormality of the device failure. By receiving the TRAP notification, the network monitoring device can know the relay station or terminal station where the device failure has occurred. In addition, when a frame has a 1-bit structure with respect to N bits, it is uneconomical to use several bits. Therefore, a scheme in which each relay station uses 1 bit in common has been proposed.

FIG. 6 shows an example of a signal configuration employed in a conventional system. In FIG. 6, F indicates a frame bit, A indicates an alarm bit, and C indicates an NMS control bit.

In this type of conventional alarm notification system, an alarm bit (polarity during alarm occurrence is "1") is extracted by an alarm extraction unit from a signal in which alarm bits received via a transmission line are multiplexed. Then, the alarm bit receiving unit is notified. Further, when a failure occurs in the device of the own station, the fact is notified from the alarm notification unit to the alarm detection unit. At this time, the output of the alarm bit receiving unit becomes "1" when an alarm has occurred in the downstream device, and the output of the alarm detecting unit becomes "1" when a fault has occurred in the own station device. . A logical OR (OR) circuit is installed in the device, and the output of the alarm receiving unit by the OR circuit unit and the logical OR output of the alarm detecting unit are multiplexed on the transmission line via the alarm bit transmitting unit. Upstream, that is, send it to the network monitoring device,
Perform alarm transfer. Such an alarm notification method is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-253430.

[0006]

According to the above-described alarm notification method, efficient alarm transfer and notification can be performed, but there are also the following problems. That is, TCP
The method of notifying an alarm of a device failure using a control path for a network monitoring device (NMS) of a LAN protocol such as / IP or the like is used when an error such as a device failure occurs in a plurality of devices due to a slow transmission path. However, there is a problem in that the communication traffic to the higher order increases, and congestion occurs, making it difficult for the network monitoring device to perform fault isolation and the like.

When a frame has a 1-bit configuration with respect to N bits, each relay station uses 1 bit in common, and the above-described method of notifying a device failure or the like is based on the failure occurring at a downstream station. Even if such a notification is issued, if a device failure or the like occurs in the relay station, there is a problem that a failure or the like in the downstream station is not reported to the network monitoring device.

Furthermore, unless a band of a control path for a network monitoring device of a LAN protocol such as TCP / IP is secured, monitoring such as fault isolation cannot be performed.

[0009]

In order to solve the above-mentioned problems, the alarm notification system according to the present invention is such that a plurality of multiplexers are cascade-connected in a time division multiplex communication system and output from each multiplexer. In an alarm notification method for notifying an alarm about a device failure to a network monitoring device via a transmission line, when a device failure from another multiplexing device among the multiplexing devices is received together with a device address indicating the failed device, If there is no device failure in the device, send the device address to the next multiplexer,
When a device failure occurs in the own device, the device address is held and the device address of the own device is transmitted.

An alarm notification system according to another aspect of the present invention is a line interface unit for terminating a line of a transmission line and synchronizing line frames, and a received signal of the line interface unit for frame synchronization in time slot units. And a frame synchronization unit for inserting a frame, an alarm bit extraction unit for extracting an alarm bit from output data of the frame synchronization unit, and an alarm bit insertion unit for inputting an alarm bit to be inserted into the frame synchronization unit, It has a test starting unit for starting a test, a self-diagnostic function for detecting a fault in the device by starting the test starting unit, and outputs a test result, and an alarm bit based on the self-diagnosing result is stored. However, if a failure has occurred, the alarm bit insertion unit is configured with a predetermined alarm bit configuration. Notified, if the self-diagnosis result failure has occurred, and comprises a control unit for notifying an alarm bits extracted by the alarm bit extraction unit to the alarm bit insertion unit.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an example of a network configuration according to the present embodiment.
In order to pass control data of the network monitoring device,
When assignment cannot be fixedly assigned or when assignment cannot be performed at all, the signal configuration is set as shown in FIG. For example, in a data configuration having a 1-bit frame for every 80 bits, as shown in FIG. 4, by using a multi-frame configuration, 5 bits (X5 to X1) are used by assigning alarm bits, The configuration is such that the device address can be inserted in a binary number.

When a device alarm occurs in the multiplexer # 3, the device address of the transmission line 2 is notified to the multiplexer 2 of "000011" (binary number) which is the device address of the multiplexer # 3. The multiplexing device # 2 notifies the control unit of the common unit of the device address notified from the transmission line 2, and when no alarm occurs in its own device, the multiplexing device # 2 has the device address of the transmission line 1. Multiplexing device address in binary! Notify to. Multiplexer # 2
If an alarm has occurred, the address of the multiplexer # 3 is held, and the transmission line 1 is notified of the device address of the multiplexer # 2. The multiplexing device # 1 notifies the NMS of the device address notified from the transmission path 1, and notifies the NMS of the device address of the minimum hop number, thereby allowing the address of the device in the network where the device failure has occurred to occur. Can be notified in a fixed time without giving congestion to a LAN protocol such as TCP / IP. Also, by accessing the multiplexer # 2 using the control data from the NMS, the device address of the downstream device held in the multiplexer is obtained, and the address of the failed device of the downstream device is recognized from the NMS. can do.

Each multiplexing apparatus in this embodiment basically includes a line unit 1, a terminal unit 2, and a common unit 3, as shown in FIG. The configuration of the multiplexer # 1 in FIG. 2 is shown.

The line section 1 basically has components having the following functions. The line interface unit 101
Terminate the transmission line and synchronize the line frame. The loop unit 102 includes the line interface unit 101
Wraps the transmitted signal to the received signal. Frame synchronization unit 1
03 is a line interface unit 101 to a loop unit 1
02 is subjected to a frame synchronization process for each received signal received via the TS. Further, when the frame has a 1-bit configuration with respect to N bits, the frame synchronization section 103 configures a multi-frame with M bits and includes an alarm device address Q bit (M> Q) in the multi-frame. Is inserted.

[0015] Received data extraction section 104 extracts received data from the received signal in synchronization with the synchronization signal from frame synchronization section 103. Alarm bit extraction section 105 extracts an alarm bit based on output data from frame synchronization section 103. The NMS control data extraction unit 106
The network monitoring control data is extracted from the received signal in synchronization with the synchronization signal of the frame synchronization unit 103. The clamp unit 105 performs a clamp process on the outputs from the reception data extraction unit 104, the alarm bit extraction unit 105, and the NMS control data extraction unit 106, and outputs them to the bus via the bus interface unit 116. Bus interface unit 116
Also inputs data on the bus and outputs the data to the transmission data insertion unit 111, NMS control data insertion unit 112, alarm bit extraction unit 113, and test bit detection unit 114.

The transmission data insertion section 111 extracts transmission data from the output of the bus interface section 116, inserts the transmission data at a predetermined insertion timing, and sends the data to the frame insertion section 110. NMS control insertion unit 112
Extracts NMS control data from the output of the bus interface unit 116, inserts the output data of the transmission data insertion unit 111 at a predetermined insertion timing, and sends the data to the frame insertion unit 110. Alarm bit insertion unit 113
Extracts the alarm address from the output of the bus interface unit 116 and outputs it to the frame insertion unit 110.

The frame insertion unit 110 receives outputs from the transmission data insertion unit 111, the NMS control data insertion unit N112, and the alarm bit insertion unit 113, and inserts a frame bit into the output of the NMS control insertion unit 112 at a predetermined insertion timing. Insert with. The test bit detection unit 114
A test bit is detected from data received via the bus interface unit 116 and output to the control unit 108. When receiving the test bit, the control unit 108
15 and a signal to that effect is output to the loop unit 102.

The test data generation / collation unit 109 collates the test data generated under the control of the control unit 108 with the output data of the reception data extraction unit 104 and compares the collation result with the control unit 1.
08 will be notified. The line interface unit 101 inserts a line frame into the output of the frame insertion unit 110 received via the loop unit 102 and sends out the line frame to the transmission path.

The control unit 108 includes a test bit detection unit 114.
By controlling the loop unit 102, the clamp unit 107, and the test data generation / collation unit 109 by receiving the detection notification of the test bit from the control unit, if the collation result indicates an error, the alarm unit 115 is notified as an alarm. The alarm notification unit 115 receives the control of the control unit 108 and notifies the occurrence of an alarm.

The terminal unit 2 is basically composed of components having the following functions. The level conversion unit 201 performs level conversion of the terminal interface. The loop unit 202 receives the control of the control unit 207, and
The output of the level return unit 201 is returned. The interface control unit 203 controls an interface of an input / output signal from the level conversion unit 201 via the loop unit 202. The bus interface unit 204 transmits and receives an input / output signal of the interface control unit 203 to / from the bus.

The test bit detection unit 205 detects test bits from data received from the common unit 3 on the bus via the bus interface unit 204 and sends out the test bits to the control unit 207. The pattern generation / collation unit 206 controlled by the control unit 207 generates test pattern data, and the generated test pattern data is collated with the data looped back by the loop unit 202 and the data obtained from the interface control unit 203. , The matching result is output to the control unit 207. If the comparison result indicates that the state is an alarm, the control unit 207 outputs a message to that effect to the alarm notification unit 208.

The control unit 207 includes a test bit detection unit 205
, The test data generation / collation unit 206 and the loop unit 202 are controlled, and if an error occurs in the collation result, the alarm notification unit 208 is notified as an alarm. The alarm notification unit 208 notifies the occurrence of an alarm under the control of the control unit 207.

The common section 3 is basically composed of sections having the following functions. The NMS control unit 301 terminates the monitoring protocol with the network monitoring device. The bus interface unit 303 performs an operation of transmitting and receiving NMS control data to and from the bus via the NMS control receiving unit 306. The T-SW unit 305 specifies a time slot which is fixedly assigned in advance as is well known.

The alarm detection unit 307 detects the reception address of the alarm transmission / reception unit 304,
In step 8, if an alarm of the own station has occurred, a preset alarm is transmitted to the alarm bit transmitting / receiving unit 304, the reception address is stored, and if no alarm of the own station has occurred, the alarm bit The receiving address is sent to the alarm bit transmitting / receiving section 304.

The alarm detection unit 307 detects the alarm bit notification of the line unit 1 and the terminal unit 2 and notifies the control unit 308 of the notification. The test start bit transmission unit 302
8 controls the test start bit to the line unit 1 and the terminal unit 2
To send to.

The operation of the above embodiment will be described below.
In the multiplexing device # 3, when the control unit 308 of the common unit 3 issues a request for test activation to the test activation transmission unit 302, the test activation is performed by the test bit detection unit 205 of the terminal unit 2 and the test bit detection unit of the line unit 1. 114 detects the test start request signal. The test bit detection unit 205 of the terminal unit 2 that has detected the test activation notifies the control unit 207 of the fact. The control unit 207 that has received this notification sets a preset time,
It requests the loop unit 202 to form a loop on the line side and the terminal side, controls the interface control unit 203, stops output to the bus interface unit 204, and causes the pattern generation / collation unit 206 to switch the output. Further, the control unit 207 causes the pattern generation / collation unit 206 to start generating a test pattern.

The generated test pattern is transmitted to the loop unit 202.
And is input to the interface control unit 203 and output to the pattern generation / collation unit 206. The pattern generation / collation unit 206 detects whether an error has occurred and notifies the control unit 207 of the presence or absence of the error. When an error has occurred, the control unit 207 notifies the alarm notification unit 208 of the occurrence of the alarm.

Further, the control unit 108 which has received the notification from the test bit detection unit 114 of the line unit 1 which has detected the test activation.
Requests the loop unit 102 to form a loop on the line side and the terminal side for a preset time, controls the clamp unit 107, stops the output to the bus interface unit 116, and sets the pattern generation / collation unit. 109 causes the output to be switched. Further, the control unit 108 activates the pattern generation / collation unit 109 to generate a test pattern. The generated test pattern is sent to the loop unit 102 via the frame insertion unit 110, where it is looped back, input to the pattern generation matching unit 109, and detects whether or not an error has occurred. Notice. Control unit 10
8 notifies the alarm notifying unit 115 of the occurrence of an alarm when an error occurs.

The alarm detecting section 307 receives the notifications from the alarm notifying section 115 and the alarm notifying section 208, and notifies the control section 308 of the occurrence of an alarm in each section. The control unit 308 stores the presence or absence of an alarm for each unit.

For example, when an error is detected by the pattern generation / collation unit 206 of the terminal unit 2, the alarm notification unit 208
The notification of the occurrence of the alarm is performed. Alarm detector 30
At 7, the control unit 308 is notified that an alarm has been notified from the terminal unit 2. The control unit 308 stores that there is a failure in the terminal unit 2 and sends the alarm bit transmission / reception unit 304
The alarm bit. At this time, if the node number of the multiplexing device # 3 is 3, the mapping of the alarm bits is represented by a binary number, and is as shown in FIG.

The alarm bit insertion unit 113 is notified of the contents as shown in FIG. 4, is mapped to frame bits by the frame insertion unit 110 as shown in FIG. 5, and is notified to the multiplexer # 2.

In the multiplexer # 2, the frame synchronization unit 10
In step 3, the frame is synchronized with the multiplexer # 3, and the alarm bit extracting unit 105 extracts the alarm bit and notifies the alarm bit transmitting / receiving unit 304 of the extracted alarm bit. The alarm bit sending / receiving unit 304 is the control unit 30.
8 is notified of the received alarm bit, and the control unit 308 stores the node number 3. If no failure has occurred in the multiplexer # 2, the node number 3 is notified to the multiplexer # 1 as an alarm bit.

In the multiplexer # 1, the frame synchronization unit 10
3, the frame is synchronized with the multiplexer # 3, the alarm bit extraction unit 105 extracts the alarm bit, and the alarm bit transmission / reception unit 304 is notified. The alarm bit sending / receiving unit 304 is the control unit 30.
8 is notified of the received alarm bit, and the control unit 308 is notified.
Since it is set in advance that there is no higher order to be notified, it can notify the NMS control unit 301 and notify the network monitoring device of the address of the failed node.

From the network monitoring device to the NMS control unit 3
For node 01, a monitor or the like for fault isolation is performed for node number 3. In multiplexing apparatus # 2,
When the pattern generation / collation unit 206 of the terminal unit 2 detects an error, the alarm notification unit 208 notifies the occurrence of an alarm. The alarm detection unit 307 notifies the control unit 308 that the terminal unit 2 has received the alarm notification, and stores that the terminal unit 2 has a failure. The frame synchronization section 103 synchronizes the frame with the multiplexer # 3, extracts the alarm bits in the alarm bit extraction section 105, and outputs the alarm bits to the alarm bit transmission / reception section 3.
04, and when the address of the alarm bit is detected, the node number 3 is notified to the control unit 308. However, when a failure occurs in its own station, the node number 2 is notified to the multiplexer # 1. I do.

In the multiplexer # 1, the frame synchronization unit 10
In step 3, the frame is synchronized with the multiplexer # 3, and the alarm bit extracting unit 105 extracts the alarm bit and notifies the alarm bit transmitting / receiving unit 304 of the extracted alarm bit. The alarm bit sending / receiving unit 304 is the control unit 30.
8 is notified of the received alarm bit. Control unit 308
Since it is set in advance that there is no higher order to be notified, it can notify the NMS control unit 301 and notify the network monitoring device of the address of the failed node.

NMS control unit 3 from the network monitoring device
By monitoring the alarm status of node number 2 with respect to node No. 01, it is possible to detect that the fault location and node number 3 stored in the control unit 308 in the multiplexer # 2 are faulty. .

In the above-described embodiment, when only a low-speed path can be taken in order for a transmission path to pass control data for network monitoring at a low speed, a frame bit is formed into a multi-frame configuration and a minimum hop is set from the network monitoring device. Notify the number and the dress of the alarmed device,
In the node where the device alarm has occurred, the address generated in the lower order is retained, and the LA such as TCP / IPO is stored.
The node in which the device alarm has occurred is notified at high speed without affecting the N protocol.

[0038]

As described above, according to the present invention,
When the frame has 1-bit structure with respect to N-bits, a multi-frame structure is constructed with M-bits and a device address is multiplexed with Q-bits so that TCP / I
Network monitoring device of LAN protocol such as P (NM
It is very economical because it is not necessary to use 1 bit as a separate band other than the control path for S) to notify the device failure. Further, the failure occurrence node can be notified without affecting the TCP / IP protocol, so that there is an effect that failure isolation can be performed at high speed. Further, by holding the addresses of the fault location and the downstream fault device in the multiplexing device, there is an effect that the fault location and the fault node can be specified at high speed.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an alarm notification system according to an exemplary embodiment of the present invention.

FIG. 2 is a network configuration block diagram of an alarm notification system according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a signal configuration in an alarm notification system according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of frame bit mapping in an alarm notification system according to an exemplary embodiment of the present invention.

FIG. 5 is a diagram showing an example of mapping when a device alarm occurs in the multiplexing device 3 in the alarm notification system according to the embodiment of the present invention.

FIG. 6 is a diagram illustrating a signal configuration example in a conventional alarm notification method.

[Explanation of symbols]

 1 line unit 2 terminal unit 3 common unit 101 line interface unit 102, 202 loop unit 103 frame synchronization unit 104 received data extraction unit 105 alarm bit extraction unit 106 NMS control data extraction unit 107 clamp unit 108, 207, 308 control unit 109, 206 Pattern generation / collation unit 110 Frame insertion unit 111 Transmission data insertion unit 112 NMS control data insertion unit 113 Alarm bit insertion unit 114, 205 Test bit detection unit 115, 208 Alarm notification unit 116, 204, 303 Bus interface unit 201 Level conversion Unit 203 interface control unit 301 NMS control unit 302 test start transmission unit 304 alarm bit transmission / reception unit 305 T-SW unit 306 NMS control transmission / reception unit 307 alarm detection unit

Claims (5)

[Claims] 1. An alarm notification system for cascading a plurality of multiplexing devices in a time division multiplexing communication system and notifying an alarm relating to a device failure output from each multiplexing device to a network monitoring device via a transmission line. In receiving a device failure from another multiplexing device among the multiplexing devices together with a device address indicating the failed device,
If no device failure has occurred in the own device, the device address is sent to the next multiplexing device. If a device failure has occurred in the own device, the device address is held and the An alarm notification method, wherein the device address is transmitted. 2. The alarm notification system according to claim 1, wherein the network monitoring device accesses the multiplexing device to acquire fault information of a downstream device. 3. The alarm notification method according to claim 1, wherein said transmission path is at a low speed. 4. A line interface section that terminates a line of a transmission line and synchronizes a line frame, and a frame synchronization section that synchronizes a received signal of the line interface section in time slot units and inserts a frame. An alarm bit extraction unit for extracting an alarm bit from output data of the frame synchronization unit, an alarm bit insertion unit for inputting an alarm bit to be inserted in the frame synchronization unit, a test activation unit for performing test activation, and the test activation It has a self-diagnosis function that detects a fault in the device by activating the unit, stores a self-diagnosis unit that outputs a test result, and stores an alarm bit based on the self-diagnosis result. The alarm bit configuration must be notified to the alarm bit insertion section and the self-diagnosis result failure must have occurred. , Alarm notification method which characterized in that it comprises a control unit for notifying an alarm bits extracted by the alarm bit extraction unit to the alarm bit insertion unit. 5. An alarm notification system for connecting a plurality of multiplexers in a tandem connection in a time division multiplex communication system, and notifying an alarm about an apparatus failure output from each multiplexer to a network monitoring apparatus via a transmission line. In the above-mentioned multiplexer, the multiplexer terminates a line of a transmission line and synchronizes a line frame with a line interface unit, and a frame for synchronizing a received signal of the line interface unit in time slot units and inserting a frame. A synchronization unit, an alarm bit extraction unit that extracts an alarm bit from the output data of the frame synchronization unit, an alarm bit insertion unit that inputs an alarm bit to be inserted into the frame synchronization unit, and a test activation unit that performs test activation, It has a self-diagnosis function that detects failures in the equipment by activating the test activating section, A self-diagnosis unit that outputs a result and an alarm bit based on the self-diagnosis result are stored. If a failure occurs, the predetermined configuration of the alarm bit is notified to the alarm bit insertion unit, and the self-diagnosis result is notified. An alarm notification system comprising: a control unit for notifying the alarm bit insertion unit of the alarm bit extracted by the alarm bit extraction unit if no failure has occurred.