JP2002261830A - System for transferring alarm signal and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for performing an ATM private line service by using an HSD(high super digital) line network, especially, a system for transferring an alarm signal capable of notifying its own office device of a specific alarm, and realizing ATM layer level maintenance. SOLUTION: This system for transferring an alarm signal is provided with an ATM terminating device 1 for detecting and transferring an alarm signal, and a management device 3 for receiving the transferred alarm signal. The ATM terminating device 1 is provided with a detecting means for detecting the alarm information, a transferring means for housing the alarm information in an OAM cell (a cell for transferring an alarm), and for transferring the OAM cell. The management device 3 is provided with a means for detecting the alarm signal housed in the received OAM cell, and for recognizing the generation of the alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm signal transfer system, and more particularly, to an alarm signal transfer system in a system for providing an ATM leased line service using an HSD network.

[0002]

2. Description of the Related Art Conventionally, HSD (high-speed digital dedicated line)
In a network, an alarm generated at a subscriber's terminating device is maintained by an alarm process of a physical layer of the HSD. Such an alarm process is performed by an LCD (Loss) at the interface of the subscriber's terminating device in the HSD network.
Cell Delineation: Loss of cell synchronization, LOS (Loss)
When an alarm such as ofSignal (signal disconnection) is detected, the main signal to the upper side is all set to “1” and the AIS signal (Alarm In)
The processing is performed by transmitting a dication signal (alarm display signal).

[0003]

However, in a system for providing an ATM leased line service using an existing HSD circuit, not only the physical layer of the HSD but also the
Maintenance at the ATM layer level is required.

[0004] The conventional HSD physical layer alarm processing is as follows.
As described above, since all the main signals to the upper side are transmitted as "1", the header portion is also rewritten to "1", and there is a problem that the maintenance at the ATM layer level cannot be performed in the upper apparatus. .

[0005] When LCD, LOS, etc. are detected by the ATM terminating device, these are alarms in the physical layer.
Inevitably, alarm transfer is performed to all VPs (Virtual Passes) on the physical line.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide an ASD using an HSD circuit network.
It is an object of the present invention to provide an alarm signal transfer system in a system for providing a TM leased line service, which notifies an alarm to a device in a higher-order company office and enables maintenance at an ATM layer level.

[0007]

In order to achieve the above-mentioned object, an alarm signal transmission system according to the present invention detects and transmits an alarm signal according to the first aspect of the present invention.
An alarm signal transfer system including a TM terminating device and a management device for receiving the transferred alarm signal, wherein the ATM terminating device detects alarm information,
Transfer means for storing the alarm information in an alarm transfer cell and transferring the alarm transfer cell,
The apparatus further comprises means for detecting an alarm signal contained in the received alarm transfer cell and recognizing generation of an alarm. Thus, the alarm information generated in the ATM terminating device on the subscriber side can be transferred to the management device installed on the upper side, maintenance can be performed at the ATM layer level based on the alarm information, and the above-mentioned object can be achieved.

An alarm signal transfer system according to the present invention comprises:
As described in claim 2, the cell for alarm transfer includes a unique value corresponding to the type of alarm information. As a result, the management device that has received the alarm information
The type of alarm information generated in the TM terminating device can be specified.

An alarm signal transfer system according to the present invention comprises:
As described in claim 3, the management device includes a plurality of A
An alarm signal, which is connected to the TM terminating device and includes a value specifying the ATM terminating device in which the alarm has occurred, is further transferred to another device. As a result, information for specifying the type of alarm information and the location where the alarm has occurred can be transferred to another device.

An alarm signal transfer system according to the present invention comprises:
As described in claim 4, the ATM termination device and the management device are connected by an HSD network. As a result, in a system that provides an ATM leased line service using an existing HSD circuit network, maintenance can be performed not only at the physical layer of the HSD but also at the ATM layer level.

An alarm signal transfer system according to the present invention comprises:
According to a fifth aspect of the present invention, the alarm transfer cell is configured to be able to transmit through a device installed in the HSD network without rewriting the contents. As a result, the contents of the alarm transfer cell can be transmitted without being rewritten by the electric utility apparatus installed on the HSD network.

[0012] The alarm signal transfer system according to the present invention comprises:
As described in claim 6, the ATM termination device includes a first switch for setting a VPI value of the alarm transfer cell, and a second switch for selecting whether to use the alarm transfer cell. 2 switch means, whereby the alarm transfer cell VPI value (Virtual Pa
ss Identifier) and whether to use the cell for alarm transfer can be set by a switch.

According to a seventh aspect of the present invention, there is provided a method for transferring an alarm signal, comprising: an ATM termination device for transferring an alarm signal; and a management device for receiving the transferred alarm signal. A transfer method in a transfer system, wherein the ATM terminal device detects an alarm signal, the ATM terminal device transmits an alarm transfer cell, and the alarm transfer cell received by the management device. And detecting alarm information from the device and recognizing the occurrence of an alarm. As a result, the alarm information generated in the ATM termination device on the subscriber side can be transferred to the management device installed on the upper side, and maintenance based on the alarm information at the ATM layer level can be performed.

[0014] The alarm signal transfer method according to the present invention is characterized in that the alarm transfer cell contains a unique value corresponding to the type of alarm information. Thus, the management device that has received the alarm information can specify the type of the alarm information.

According to a ninth aspect of the present invention, in the alarm signal transfer method, the value for specifying the ATM terminating device in which the alarm has occurred is stored in the alarm transfer cell received by the management device. , Transferring to another device. As a result, information for specifying the type of alarm information and the location where the alarm has occurred can be transferred to another device.

In the alarm signal transfer method according to the present invention, the ATM termination device and the management device are connected by an HSD line network, and the alarm transfer cell is connected to the ATM terminal device. And the step of transmitting the contents installed in the HSD circuit network without rewriting the contents. As a result, in a system for providing an ATM leased line service using an existing HSD circuit network,
Maintenance can be performed not only at the physical layer of the SD but also at the ATM layer level, and the contents of the alarm transfer cell can be transmitted without being rewritten by an electric utility company installed in the HSD network.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a warning signal transfer system according to the present embodiment. As shown in FIG. 1, the alarm signal transfer system according to the present embodiment includes an ATM termination device 1 of an ATM line 5a on the subscriber side,
It comprises an in-house station (management device) 3 connected to an ATM line 5b in the office. The ATM termination device 1 and the in-house station device (management device) 3 are connected via the telecommunications carrier device 2 of the HSD network 6. The ATM termination device 1 is provided with a subscriber interface 4 for a subscriber-side ATM terminal. Further, the ATM termination device 1 includes a first switch means (for example, an 8-bit switch) for setting a VPI value (Virtual Pass Identifier) which is a VP (Virtual Pass) identifier of the alarm transfer cell, and an alarm transfer cell. Second switch means for selecting whether to use the cell (for example, a 1-bit switch,
N / OFF is used to select whether or not to use the above).

Next, the operation of the transfer method in the alarm signal transfer system according to the present embodiment will be described with reference to FIG.

As shown in FIG. 2, the ATM termination device 1
An alarm signal such as an LCD or LOS is detected by the subscriber interface 4 of the subscriber-side ATM terminal provided therein (step S1). ATM termination device 1
Is an O that accommodates an alarm signal such as LCD, LOS, etc.
The data is transferred to the upper-level telecommunications carrier device 2 as AM (Operation And Mentenance: cell for alarm transfer) (step S2).

FIG. 3 is a diagram showing a configuration of an OAM cell in the alarm signal transfer system according to the present embodiment. As shown in FIG. 3, the OAM cell (cell for alarm transfer) has 5
It is a cell composed of a byte header and an information field. In the information field, a 4-bit code “0000” which is not generally defined as an OAM type code is assigned.
It includes an AM type and a 4-bit function type to which various types of alarms such as AIS are assigned.
The OAM cell configured as described above is connected to the ATM termination device 1.
The alarm transfer between the ATM terminating device 1 and the in-house device (management device) 3 is performed using the dedicated VP according to the VPI value set by the dip switch.

Each alarm has a unique identification value for identifying the type of the alarm. For example, when configuring the alarm identification value with 4 bits, “1000” is set to AI.
S, “0100” is set to R-INH or the like, and is incorporated in the payload portion of the OAM cell as information for specifying the type of each alarm.

The OAM cells transferred from the ATM terminating device 1 are arranged in an HSD frame by the conversion means provided in the ATM terminating device 1 and transmitted to the HSD line network 6. The OAM cell is transmitted without being terminated in the telecommunications carrier device 2, and is transmitted to the in-house station device 3 without changing its contents (step S3). Therefore, the alarm processing in the physical layer does not occur in the telecommunications carrier device 2 and does not erroneously affect the main signal.

The in-house device 3 detects the AIS alarm information from the received OAM cell, and recognizes the location where the alarm has occurred and the type of the alarm (step S4). Further, the in-house station device 3 has a function of notifying the higher-level side of the alarm information. The in-house station device 3 usually includes a plurality of ATs.
Since it is connected to the M terminating device 1, it is necessary to identify which ATM terminating device 1 is the alarm information. Therefore,
The VPI value of the access section of the specific ATM terminating device 1 is converted into the VPI value of the relay section in the entire system. The cell whose VPI value is converted in this way is referred to as VP-AI
Notated as S cell. Further, the VP-AIS cell is transferred to a higher-level device (not shown) (step S5).

[0024]

As described above, according to the present invention,
As described in claim 1, the ATM terminating device has a detecting means for detecting alarm information and a transfer means for storing the alarm information in an alarm transfer cell and transferring the alarm transfer cell. Since the device has a means for detecting the alarm signal contained in the received alarm transfer cell and recognizing the occurrence of the alarm, the alarm information generated in the ATM termination device on the subscriber side is installed on the upper side. AT can be transferred to the management device
An alarm signal transfer system capable of performing maintenance based on alarm information at the M layer level can be provided.

Further, according to the present invention, as described in claim 2, the alarm transfer cell includes a unique value corresponding to the type of alarm information, and therefore, the management device that has received the alarm information sets the ATM. An alarm signal transfer system capable of specifying the type of alarm information generated in the terminal device can be provided.

Further, according to the present invention, as set forth in claim 3, the management device is connected to the plurality of ATM terminating devices, and outputs the alarm signal including a value specifying the ATM terminating device in which the alarm has occurred. Further, since it is configured to transfer the alarm information to another device, it is possible to provide an alarm signal transfer system capable of transferring information specifying the type of alarm information and the location where the alarm has occurred to another device.

Further, according to the present invention, as described in claim 4, the communication between the ATM termination device and the management device is performed by the HS.
Since the connection is made by the D line network, an alarm signal transfer system capable of performing maintenance not only at the physical layer of the HSD but also at the ATM layer level in a system for providing an ATM leased line service using the existing HSD line network can be provided. .

Further, according to the present invention, as described in claim 5, the alarm transfer cell is configured so as to be able to pass through a device installed in the HSD network without rewriting the contents. Therefore, it is possible to provide an alarm signal transfer system that allows the contents of the alarm transfer cell to be transmitted without being rewritten by an electric utility apparatus installed on the HSD network.

Further, according to the present invention, as described in claim 6, the ATM terminating device is provided with the VPI of the alarm transfer cell.
Since it has first switch means for setting a value and second switch means for selecting whether or not to use the alarm transfer cell, the VPI value of the alarm transfer cell and the use of the alarm transfer cell It is possible to provide an alarm signal transfer system capable of setting whether or not it is possible with a switch.

According to the present invention, as set forth in claim 7, an ATM termination device detects an alarm signal, the ATM termination device transmits an alarm transfer cell, and the management device. Detecting the alarm information from the alarm transfer cell received by the subscriber, and recognizing the occurrence of the alarm. And a maintenance method based on the alarm information at the ATM layer level.

Further, according to the present invention, as described in claim 8, the management device having received the alarm information can store the unique value corresponding to the type of the alarm information in the alarm transfer cell. In addition, it is possible to provide an alarm signal transfer method capable of specifying the type of alarm information.

Further, according to the present invention, the method includes the step of transferring the line information of the cell for alarm transfer received by the management apparatus to another apparatus, so that the type of alarm information and It is possible to provide a method of transferring an alarm signal in which information for specifying a place where an alarm has occurred can be transferred to another device.

Further, according to the present invention, as described in claim 10, the communication between the ATM termination device and the management device is H
The cell for alarm transfer is connected by an SD line network,
In a system for providing an ATM leased line service using an existing HSD circuit network by including a step of transmitting the contents of the apparatus installed in the D circuit network without being rewritten,
Provides an alarm signal transfer method that allows maintenance not only at the physical layer of the HSD but also at the ATM layer level and allows the contents of the alarm transfer cells to be transmitted without being rewritten by the electric utility equipment installed on the HSD network. it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an alarm signal transfer system according to an embodiment.

FIG. 2 is a diagram for explaining an operation of a transfer method in the alarm signal transfer system according to the embodiment;

FIG. 3 is a diagram showing a configuration of an OAM cell in the alarm signal transfer system according to the embodiment.

[Explanation of symbols]

 Reference Signs List 1 ATM termination device 2 Telecommunications carrier device 3 In-house device (management device) 4 Subscriber interface 5a, 5b ATM line 6 HSD line network

Claims (10)

[Claims] 1. An alarm signal transfer system comprising: an ATM termination device for detecting and transmitting an alarm signal; and a management device for receiving the transmitted alarm signal, wherein the ATM termination device detects alarm information. Detecting means for storing the alarm information in a cell for alarm transfer, and transfer means for transferring the cell for alarm transfer, wherein the management device includes an alarm contained in the received cell for alarm transfer. An alarm signal transfer system comprising means for detecting a signal and recognizing occurrence of an alarm. 2. The alarm signal transfer system according to claim 1, wherein the alarm transfer cell includes a unique value corresponding to a type of alarm information. 3. The management device is connected to a plurality of ATM terminating devices, and is configured to further transfer an alarm signal including a value specifying an ATM terminating device in which an alarm has occurred to another device. 3. The alarm signal transfer system according to claim 2, wherein: 4. The alarm signal transfer system according to claim 1, wherein the ATM termination device and the management device are connected by an HSD network. 5. The alarm signal transmission system according to claim 4, wherein the alarm transfer cell is configured to be able to transmit through a device installed in the HSD network without rewriting the contents. Transfer system. 6. The ATM termination device comprises: a first switch for setting a VPI value of the alarm transfer cell; and a second switch for selecting whether to use the alarm transfer cell.
And a switch means.
6. The alarm signal transfer system according to any one of 5. 7. An ATM termination device for transferring an alarm signal,
A method for transferring an alarm signal in an alarm signal transfer system, comprising: a management device that receives the transferred alarm signal, wherein the ATM terminal device detects an alarm signal; and the ATM terminal device includes an alarm transfer cell. Transmitting an alarm signal from the alarm transfer cell received by the management device, and recognizing generation of an alarm. 8. The alarm signal transfer method according to claim 7, wherein the alarm transfer cell contains a unique value corresponding to the type of alarm information. 9. The method according to claim 8, further comprising the step of storing a value specifying the ATM terminating device in which the alarm has occurred in the alarm transfer cell received by the management device and transferring the value to another device. 2. The alarm signal transfer system according to claim 1. 10. The ATM termination device and the management device are connected by an HSD network, and the alarm transfer cell passes through a device installed in the HSD network without rewriting the contents. 10. The alarm signal transfer system according to claim 7, further comprising the step of: