JP2993356B2 - Communication system fault monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault monitoring system in a communication system , and more particularly to a fault monitoring system for a synchronous digital hierarchy (SDH) transmission network, which is a new digital transmission synchronous network.

[0002]

2. Description of the Related Art In response to a rapidly increasing demand for data communication, digital transmission systems have been put to practical use mainly for the purpose of economically providing data dedicated lines and data exchange lines.

[0003] Regarding this kind of digital transmission system,
ANSI (American National St)
and ITU (formerly CCITT).

In such an SDH transmission network, a network fault monitoring system is used because it is necessary to specify the location of a section fault that causes a path alarm detected by a path terminating unit. .

FIG. 4 is a schematic system block diagram of the network fault monitoring system. Between the path terminating devices 111 and 112, the bidirectional paths 11a and 11b (in this example, each of the upstream and downstream paths is shown as one for simplicity, but in practice, a plurality of upper and lower paths are used). ), And in order to accommodate these paths for each section, the bidirectional section pairs 1a and 1b, 2a and 2b, 3a and 3b,
4a and 4b, 5a and 5b, 6a and 6b are provided, respectively.

The bidirectional section pair 1a, 1b is provided between the path terminating device 111 and the cross-connect device 121, and the bidirectional section pair 2a, 2b and 5a, 5b are provided between the cross-connect devices 121, 122, and 124. Are provided respectively. Also, the bidirectional section pair 3a, 3
b and 6a and 6b are cross-connect devices 122 and 12
2 and 123, two bidirectional section pairs 4
a and 4b denote the cross-connect device 123 and the path termination device 1
12 is provided.

The path terminating devices 111 and 112 include path terminating units 31 and 41 for terminating paths, section terminating units 21 and 28 for terminating sections, and alarm processing units 51 and 55.
And

[0008] The cross-connect devices 121 to 124 include section end portions 22 to 27, 29, and 30 and matrix portions 100-1 to 100 that exchange paths between sections.
100-4 and alarm processing units 52 to 54 and 56.

Each section termination section has an AIS section, detects a failure in the reception section, and applies a path AIS (Alarm) to all paths accommodated in the reception section.
The path AIS inserts "1" not only in the overhead part of the transmission signal but also in the payload part (data part) to notify the occurrence of a failure.

A network monitoring device 101 for monitoring the entire network is provided, receives fault information from each of the alarm processing units 51 to 56, and specifies the location of a fault section from the fault information and the information in the database 102. It is supposed to do.

In such a configuration, a failure handling operation will be described with reference to FIG. FIG. 5 is a diagram when a failure occurs in the section 2a (indicated by an X mark) in the same block as FIG.

[0012] In this case, the network monitoring apparatus 101 to identify the section failed, by performing the switching operation of the matrix portion 100-1 and 100-4 as illustrated section
It is necessary to avoid the failed section 2a by establishing a new route by the sections 5a, 5b, 6a, 6b. Therefore, it is necessary to specify the faulty section. The procedure will be described below.

When a failure occurs in the section 2a, the section terminating section 2 uses this section as a receiving section.
4 transmits the section alarm notification A1 to the network monitoring apparatus 101 via the alarm processing unit 53, and at the same time, all the paths 11a accommodated in the section 2a by the AIS unit.
(In this example, one path is shown.) The path AIS is inserted.

A path terminating section 41 for terminating the path 11a
Detects the path AIS and sends a path alarm notification A2 to the network monitoring apparatus 101 via the alarm processing unit 55.

In the network monitoring apparatus 101, both alarm notifications A1,
In response to A2, access is made to the network configuration database 102 representing the accommodation relationship between the path and the section, the section accommodating the path 11a is searched, and the path 11a is retrieved.
Pass through the sections 1a, 2a, 3a, 4a.

Next, the alarm status of each of the sections 1a to 4a is checked by the presence or absence of a section alarm notification from each section end. Since the section alarm notification A1 exists from the section 2a, the section 2a
This is specified as the cause of the path warning of 1a.

[0017]

In such a conventional network fault monitoring system, in order to specify the location of a section fault that causes a path alarm, a database 102 of a network configuration showing the relationship between sections and paths is used. Is required.

FIG. 5 shows an example in which a section fault occurs only in one section 2a. However, when a fault occurs simultaneously in other sections, the section in which the fault has occurred is received. Since a section alarm notification is also generated from the section terminating device to be a section to the network monitoring device 101, the network monitoring device 101 generates a network configuration database 102 indicating the relationship between the section and the path.
If it is not referred to, it is difficult to specify the location of the section fault that causes the path alarm.

Since the network configuration can be changed by the cross-connect device (it is actually changed from the state shown in FIG. 4 to the state shown in FIG. 5), in order to specify the fault location using the network configuration database, the database is always changed. It is necessary to provide management means that makes the same as the actual network configuration.

An object of the present invention is to provide a fault monitoring system in a communication system capable of always specifying a faulty section location accurately without using a network configuration database.

[0021]

According to the present invention, a two-way communication system is provided.
At both ends of the communication path to terminate the path.
Path termination and the bidirectional section containing the path.
At both ends of the bidirectional section pair to terminate the
Provided section ends and these section ends
Communication including monitoring means for monitoring the path and the path terminating section
A fault monitoring system in a system, comprising: means for inserting a path end name for uniquely identifying the terminal end into the path at the path end part ; and the section end part terminating at the section end part. both
Path end point name monitoring means for monitoring the path end point name inserted in the path accommodated in the forward section pair , and the section end section terminates at the section end section.
The interactive section detects a failure of the bidirectional section pairs that
The alarm information is inserted into the path accommodated in the pair and monitored by the path end point name monitoring means.
Means for notifying the path termination point name to the monitoring means, and means for detecting the alarm information in the path termination unit and notifying the path termination point name of the path in which the alarm information is inserted to the monitoring means, The monitoring means is notified of these
A fault monitoring system is provided in which a section fault is specified using a path end point name.

[0022]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention, and the same parts as those in FIGS. If only the parts different from the conventional example of FIG. 4 are described,
The network configuration database referred to by the network monitoring device 101 is not used. Instead, path end point names (P1, P2, etc.) for uniquely identifying each path end part in each path end point name 31, 41 are used. Termination point name holding units 81 and 91 for holding and inserting the corresponding path are provided.

This terminal point name is a path overhead (PO
H), which is inserted into the unused part in ITU-T Recommendation G. In 709, in the case of a VC (virtual container) -3 or VC-4 path, the F2 byte of the POH is defined as a user channel byte and can be used for insertion of a path end point name.

An F2 monitor unit (indicated by F2) is provided to monitor the path end point name of the F2 byte of the transmission section of each of the section end units 21 to 30. Each of the alarm processing units 51 to 56 notifies the network monitoring device 101 of a communication such as a section failure or a path failure detected in each device as an alarm notification. If the alarm is a section alarm, the path termination point name monitored by the F2 monitor unit (F2) of the transmission section corresponding to the reception section that detected the alarm is added to the alarm notification. If the alarm is a path alarm, the name of the path termination point that detected the failure is added to the alarm notification.

The other configuration is the same as that of FIG. 4, and the description is omitted.

In such a configuration, the failure handling operation will be described with reference to FIG. FIG. 2 shows the section 2a in the same block as FIG.
FIG. 3 is a diagram when a failure has occurred.

In this case, the network monitoring apparatus 101 specifies the section in which the fault has occurred, and performs a switching operation between the matrix units 100-1 and 100-4 as shown in the figure to execute a new route by the sections 5a, 5b, 6a, and 6b. It is necessary to avoid the faulty section 2a by performing the following. Therefore, it is required to specify the faulty section. The procedure will be described below.

When a fault occurs in the section 2a, the section terminating section 24 sets this section as a receiving section.
Detects a section failure and inserts a path AIS into all the paths 11a accommodated by the section 2a by a path alarm insertion unit (indicated by AIS). At this time, the F2 monitor unit (indicated by F2) in the section end unit 24 monitors the F2 byte in the POH of the path 11b accommodated in the section 2b in the opposite direction to the section 2a, and is inserted into the F2 byte. Terminating point name is P
2 is detected.

The end point name P2 detected by this monitor
Is added to the section alarm notification and sent to the network monitoring apparatus 101 via the alarm processing unit 53.

On the other hand, the path terminating unit 41 detects the path AIS inserted in the section terminating unit 24 to recognize the failure of the path 1a, and inputs its own path terminating point name P2 via the alarm processing unit 55 to the network monitoring apparatus 101. It is sent to.

The path terminating point name added to the previous section alarm indicates the path terminating point name at which a path failure due to the section failure is detected. Therefore, if the path end point name added to the path alarm notification is compared with the path end point name added to the section alarm and there is a match (in this example, it becomes P1 and matches), the corresponding section alarm corresponds. The section (2a in this example) can be specified as a cause of the failure of the path 11a.

In the above description, one path is accommodated in each section for the sake of simplicity. However, in general, a plurality of paths are accommodated, and thus three paths are accommodated in the section in FIG. An example is shown in which

Each of a pair of upstream and downstream paths 11a and 11b, 12a and 12b, 13a and 13b in the path termination unit 31 in the path termination unit 111 is provided with path termination point name retaining units 81, 82, 83 (P11, P12, P13) is provided, and the F2 monitor unit (indicated by F2) of the section termination unit 23 is connected to each path (transmission path) 11a, 12a of the transmission section 1a.
The F2 bytes a and 13a are monitored. The same applies to the other path terminating devices 112, and the F2 monitor of each section terminating unit in each of the cross-connect devices 121 to 124 monitors the F2 byte of each path of the transmission section.

The path terminating point names on the path terminating device 112 side are indicated as P21, P22 and P23.

In this case, under the same conditions as in FIG. 2, the end point names P21, P22, and P23 of each path shown in FIG. 3B are respectively added to the alarm notification to the network monitoring apparatus 101. , The failure path can be specified.

[0037]

As described above, according to the present invention, by adding each terminal point name of a path accommodated in a section to each of the path alarm notification and the section alarm notification, and comparing these path terminal point names. Since the location of a section failure that causes a path failure can be specified, there is an effect that a database indicating a network configuration is not required.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a failure detection operation of the block in FIG. 1;

FIG. 3A is a diagram illustrating some blocks of another embodiment of the present invention, and FIG. 3B is a diagram illustrating an example of a failure notification when the block of FIG.

FIG. 4 is a block diagram of a conventional network fault monitoring system.

FIG. 5 is a diagram for explaining a fault operation of the block in FIG. 4;

[Explanation of symbols]

 1a-6a, 1b-6b Section 11a, 11b Path 21-30 Section terminal 31, 41 Path terminal 51-56 Alarm processing unit 81,91 Path terminal point name holding unit 100-1-100-4 Matrix unit 111,112 Path terminating devices 121 to 124 Cross-connect device AIS Path AIS insertion unit F2 F2 byte monitor unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification code FI H04Q 11/04 (58) Fields investigated (Int.Cl. ⁶ , DB name) H04J 3/00-3/26 H04L 5/22 -5/26 H04L 12/00-12/28 H04L 12/50-12/66 H04M 3/00 H04M 3/08-3/40 H04M 7/00-7/16 H04Q 1/20-1/26 H04Q 3 / 52 H04Q 11/00-11/04

Claims (4)

(57) [Claims] 1. A path which is a bidirectional communication path should be terminated.
A path terminator provided at both ends of the path;
To terminate a bidirectional section pair containing
Section end portions provided at both ends of the section pair,
These monitor the section end and path end.
A fault monitoring system in a communication system including a monitoring unit , wherein the path terminating unit inserts a path terminating name for uniquely identifying the terminating unit into the path ; Section end
Terminating point name monitoring means for monitoring the path terminating point name inserted in the path accommodated in the bidirectional section pair terminating at the section terminating section;
The twin detects its failure bidirectional section pairs that terminate
Means for inserting alarm information for the path accommodated in the directional section pair and for notifying the monitoring means of the path terminal point name monitored by the path terminal point name monitoring means; and detecting the alarm information in the path terminal section Means for notifying the monitoring means of the path end point name of the path in which the alarm information has been inserted, and the monitoring means uses the notified path end point names to identify section faults. A fault monitoring system characterized by: 2. A two-way section pairs houses by multiplexing a plurality of paths, it is an accommodation path accommodating pass the other direction section of one-way sections of this interactive section versus the same path The fault monitoring system according to claim 1, wherein: 3. The path termination point name monitoring means, when the section termination section detects a failure in a bidirectional section pair terminated by the section termination section,
The section of the failed bidirectional section pair where the failure was detected.
The end of the pass contained in the section opposite to the
3. The fault monitoring system according to claim 2, wherein an end point name is monitored. 4. The communication system according to claim 1, wherein the communication system is an SDH (Synchronous Digital Hierarchy) communication system , and the path end point name is inserted into an unused portion of a path overhead section. Fault monitoring system.