JPH10242995A - Alarm processing method in ATM transmission equipment - Google Patents

Abstract

(57) [Summary] Even if an ATM cell abnormality is detected, an alarm display and an alarm notification are not performed when alarm stop information is received by an ATM path information notification cell. SOLUTION: An ATM path information notification cell (alarm stop information) when an ATM cell abnormality is detected in an ATM transmission device.
The alarm display and the alarm notification for the ATM cell abnormality are suspended for a specified time required for receiving the packet. When the ATM path information notification cell (alarm stop information) is received within the specified time, the alarm display and the alarm notification are not performed as it is. On the other hand, when the ATM path information notification cell (alarm stop information) is not received during the specified time, the ATM path information notification cell (ATM) is transmitted after the specified time has elapsed and within the specified time.
When the cell abnormality information is received, after the reception, the hold of the alarm display and the alarm notification are released, and the alarm display and the alarm notification are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (ATM) for interconnecting an ATM (asynchronous transfer) network and an STM (synchronous transfer) network.
The present invention relates to an alarm processing method in a TM transmission device.

[0002]

2. Description of the Related Art FIG. 3 shows a connection form between an ATM network and an STM network. In the figure, an ATM transmission device 1A and an ATM transmission device 1B are connected via an ATM network 2. The ATM transmission device 1A and the STM transmission device 3A are connected via an STM network 4A, and the ATM transmission device 1B and the STM transmission device 3A are connected to each other.
B is connected via the STM network 4B.

[0003] The ATM transmission apparatus 1A converts (converts) an STM signal from the STM network 4A into an ATM cell and converts the signal into an ATM cell.
The ATM cell is transmitted to the network 2, and the ATM cell from the ATM network 2 is converted into an STM signal (decellulated) and transmitted to the STM network 4A. Further, the ATM transmission apparatus 1A detects an abnormality at the time of receiving the STM signal, and detects an abnormality of the ATM cell received from the ATM network 2 and performs an alarm display and an alarm notification according to the ATM path information notification cell. The same applies to the ATM transmission device 1B.

FIG. 4 shows an alarm processing mode after a power supply is stopped in a conventional ATM transmission apparatus. In the figure, when the power of the ATM transmission device 1B is stopped, the transmission of the ATM cell is stopped, and the opposite ATM transmission device 1A detects the ATM cell abnormality. When the ATM transmission apparatus 1A detects an ATM cell abnormality, an alarm is displayed immediately and an alarm notification for transmitting an alarm generation notification signal to the STM transmission apparatus 3A is issued.

[0005] By the way, the power stop of the ATM transmission apparatus 1B is usually performed by an operator's operation, and is different from a normal failure. Therefore, an ATM cell abnormality due to a power supply stop is distinguished, and in that case, an alarm display or an alarm notification is stopped so as not to affect the STM network side.
That is, the ATM transmission apparatus 1B transmits an ATM path information notification cell (alarm stop information) for notifying the power stop, and the ATM transmission apparatus 1A that receives the cell stops the alarm display and the alarm notification accompanying the ATM cell abnormality detection. It is to let. The ATM transmission device 1B has a power source for transmitting an ATM path information notification cell (alarm stop information) for a predetermined time after the power source is stopped.

FIG. 5 shows an alarm processing method in a conventional ATM transmission device. In the figure, the ATM transmission device is A
As soon as the ATM cell abnormality is detected in the TM cell abnormality detection judgment S11, an alarm is displayed and an alarm notification for transmitting an alarm generation notification signal to the STM network side is performed (S12). In the ATM path information notification cell reception determination S13, it is determined whether the content is the ATM cell abnormality information or the alarm stop information. The ATM path information notification cell includes a case where "ATM cell abnormality information" is notified when an ATM cell abnormality is detected in the ATM network;
When the power of the TM transmission device is stopped, "alarm stop information" may be notified. ATM path information notification cell is ATM
If the cell abnormality information has been notified, the same processing as that performed when the ATM cell abnormality is detected is performed (S12). On the other hand, when the ATM path information notification cell notifies the alarm stop information,
The alarm display and alarm notification already performed by the ATM cell abnormality detection are stopped (S14).

FIG. 6 shows a transmission interval of the ATM path information notification cell. In the figure, the ATM path information notification cell is sequentially transmitted to all the related ATM paths (about 4096 lines) after the power failure or the occurrence of the abnormality of the ATM cell. For this reason, the last ATM transmitted after the power is turned off
The time until the path information notification cell is a maximum of about 370 milliseconds.

[0008]

The problem of the alarm processing method in the conventional ATM transmission apparatus will be described with reference to FIG. Here, the transmission delay time of the ATM cell is not considered. When a power outage occurs in the ATM transmission apparatus 1B, the transmission of ATM cells is stopped.
In the transmission apparatus 1A, A
Detects TM cell abnormalities. Here, the transmission interval of the ATM cell depends on a time (ATM cell delay time) for converting the STM signal into an ATM cell in the ATM transmission device. 64 STM signals
Assuming kbit / s information, the ATM cell delay time is about
1.9 milliseconds.

On the other hand, since the ATM path information notification cell (alarm stop information) is sequentially transmitted to all the related ATM paths as shown in FIG. 6, the ATM transmission apparatus 1A receives the ATM path information notification cell. It takes a certain amount of time to complete. That is, when a power stop occurs in the ATM transmission device 1B, the probability of detecting an ATM cell abnormality first in the opposing ATM transmission device 1A increases. At this time, AT
In the M transmission apparatus 1A, after detecting the ATM cell abnormality,
Until the TM path information notification cell (alarm stop information) is received, an alarm display and an alarm notification are performed.
This has an adverse effect on the M network side.

According to the present invention, even if an ATM cell abnormality is detected,
It is an object of the present invention to provide an alarm processing method in an ATM transmission apparatus that controls not to perform alarm display and alarm notification when alarm stop information is received by an ATM path information notification cell.

[0011]

The alarm processing method in the ATM transmission apparatus according to the present invention is characterized in that when an ATM cell abnormality is detected in the ATM transmission apparatus, an ATM path information notification cell (ATM cell) accompanying a power supply stop of the opposite ATM transmission apparatus. The alarm display and the alarm notification for the ATM cell abnormality are suspended for a specified time required for receiving the alarm stop information). When the ATM path information notification cell (alarm stop information) is received within the specified time, the alarm display and the alarm notification are not performed as it is.

On the other hand, when the ATM path information notification cell (alarm stop information) is not received during the specified time, the ATM path information notification cell (A) is transmitted after the specified time has elapsed and within the specified time.
When the TM cell abnormal information is received, after the reception, the hold of the alarm display and the alarm notification is released, and the alarm display and the alarm notification are performed.

[0013]

FIG. 1 shows an embodiment of an alarm processing method in an ATM transmission apparatus according to the present invention. In the figure,
When an ATM cell abnormality is detected in the ATM cell abnormality detection judgment S1, the alarm display and the alarm notification are suspended, and the counting of the ATM path information notification cell reception timer is started (S1).
2). Thus, even if the ATM transmission apparatus detects an ATM cell abnormality, an alarm display is not immediately performed, and an alarm occurrence notification signal is not transmitted to the STM network side.

During the counting of the ATM path information notification cell reception timer, the ATM cell abnormality detection judgment S3 and the ATM path information notification cell reception judgment S4 are repeated. here,
The specified time of the ATM path information notification cell reception timer is AT
The reception time difference between the M path information notification cell (alarm stop information) and the ATM cell or the reception time difference is set to a certain time longer. That is, it is set to be equal to or longer than the time difference between the maximum transmission interval of the ATM path information notification cell and the ATM cell transmission interval shown in FIG. Here, it is set to 500 milliseconds as an example (S5).

If no ATM cell abnormality is detected in the ATM cell abnormality detection judgment S3, the suspension of the alarm display and the alarm notification is released, and the state is returned to the non-detection state of the ATM cell abnormality (S6). ATM cell abnormality detection judgment S
If an ATM cell abnormality is detected in step 3 and an ATM path information notification cell (alarm stop information) due to power shutdown is received in the ATM path information notification cell reception determination step S4, the display of the alarm and the suspension of the alarm notification are switched to stop. (S7). Thus, even if an ATM cell abnormality is detected before receiving the ATM path information notification cell (alarm stop information), the ATM transmission apparatus does not perform the alarm display and the alarm notification, and the alarm generation notification signal is sent to the STM network side. It will not be sent.

On the other hand, at the ATM cell abnormality detection judgment S3, the AT
If an M cell error is detected and an ATM path information notification cell (ATM cell error information) due to an ATM cell error in the ATM network is received in the ATM path information notification cell reception judgment S4, the alarm display and the alarm notification hold Is released, and an alarm display and an alarm notification are performed again (S8). Also, ATM
Even if the path information notification cell reception timer has passed the specified time (S
5: Yes), ATM path information notification cell (alarm stop information)
Is not received, the hold of the alarm display and the alarm notification is similarly released, and the alarm display and the alarm notification are performed again (S8).

FIG. 2 shows an example of an alarm processing operation in the ATM transmission apparatus of the present invention. When the power is stopped, the ATM transmission device 1B stops transmitting the ATM cells and transmits an ATM path information notification cell (alarm stop information) to all ATM paths. Normally, ATM path information notification cell (alarm stop information)
Since the ATM cell transmission interval is shorter than the transmission interval of
The opposite ATM transmission apparatus 1A detects an ATM cell abnormality first.

The ATM transmission apparatus 1A does not perform alarm display and alarm notification even if an ATM cell abnormality is detected, and suspends the operation.
Thereafter, upon receiving the ATM path information notification cell (alarm stop information) from the ATM transmission device 1B, the ATM transmission device 1
Recognizing that the power supply of B has stopped, the display of the alarm and the suspension of the alarm notification are switched to stop. Further, the ATM transmission device 1A
Subsequent to the TM cell abnormality detection, the ATM path information notification cell (A
When the TM cell abnormality information is received, the hold of the alarm display and the alarm notification is released, and the alarm display and the alarm notification are performed again.

In the present embodiment, the alarm processing in the ATM transmission apparatuses opposing one-to-one via the ATM network has been described. However, the alarm processing in the ATM transmission apparatuses opposing one-to-N (N is an integer of 2 or more) is described. The method of the present invention can be similarly applied to alarm processing.

[0020]

As described above, according to the alarm processing method in the ATM transmission apparatus of the present invention, the alarm display and the alarm notification are temporarily suspended when the ATM cell abnormality is detected.
It waits for a specified time until the state is notified in the M path information notification cell. AT including alarm stop information within this specified time
When the M path information notification cell is received, the display of the alarm and the suspension of the alarm notification are switched to stop. This allows
Even if the ATM cell abnormality is detected, the alarm display and the alarm notification need not be performed. That is, since the alarm occurrence notification signal is not transmitted even temporarily,
The influence on the M network side can be avoided. If the ATM path information notification cell including the alarm stop information is not received within the specified time, the alarm display and the alarm notification can be performed after the specified time has elapsed.

On the other hand, when an ATM path information notification cell including ATM cell abnormality information is received within a specified time period during which the alarm display and the alarm notification are suspended, an alarm is displayed immediately and an alarm generation notification signal is sent to the STM network. Can be sent to the side. As a result, an alarm display and an alarm notification can be performed simultaneously with the occurrence of an ATM cell abnormality in the ATM cell network.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of an alarm processing method in an ATM transmission device of the present invention.

FIG. 2 is a timing chart showing an example of an alarm processing operation in the ATM transmission device of the present invention.

FIG. 3 is a block diagram showing a connection form between an ATM network and an STM network.

FIG. 4 is a diagram showing an alarm processing mode after power is turned off in a conventional ATM transmission device.

FIG. 5 is a flowchart showing a warning processing method in a conventional ATM transmission device.

FIG. 6 is a timing chart for explaining a transmission interval of an ATM path information notification cell.

FIG. 7 is a timing chart showing an example of an alarm processing operation in a conventional ATM transmission device.

[Explanation of symbols]

 1A, 1B ATM transmission device 2 ATM network 3A, 3B STM transmission device 4A, 4B STM network

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04L 29/14 H04L 13/00 313 H04Q 3/00

Claims (2)

[Claims] 1. An alarm processing method in an ATM transmission device for performing alarm display and alarm notification in response to detection of an abnormality of an ATM cell, wherein the alarm display and the alarm notification are suspended when the ATM cell abnormality is detected. When the ATM path information notification cell including the alarm stop information due to the power supply stop is received within a specified time after detecting the ATM cell abnormality, the display of the alarm and the hold of the alarm notification are switched to stop, and within the specified time. When the ATM path information notification cell including the ATM cell abnormality information is received, and after receiving the ATM path information notification cell including the alarm stop information, the alarm display and the alarm notification are suspended after the specified time has elapsed. An alarm processing method in an ATM transmission device, wherein an alarm is displayed and an alarm is notified by releasing the alarm. 2. An ATM path information notification cell including alarm stop information accompanying a power supply stop of an ATM transmission apparatus is transmitted to all ATM paths accommodated in the ATM transmission apparatus. 2. The alarm processing method in the ATM transmission device according to claim 1, wherein the alarm transmission method is set for a fixed time longer by a reception time difference between the ATM path information notification cell including the alarm stop information and the ATM cell or the reception time difference.