JPH11266268A - Alarm transfer method between atm terminal station and atm terminal station adjacent device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a manager to detect failures, in a path which passes through the use of a different communication path by transmitting an alarm display signal in the direction of a transmission destination from an opposite side line of a line having a failure if a communication failure of ATM communication is supervised that directs from one ATM terminal station to the other ATM terminal station and detecting failures. SOLUTION: When an ATM terminal station adjacent device 1-4 detects the occurrence of a communication failure in the direction from a C point to a D point, it transmits an alarm display signal P-AIS in the direction of an E point of a communication pass path. An ATM terminal station 1-2 of a transmission destination receives the P-AIS and detects that the communication failure occurs. When a communication failure occurs in the direction from the D point to the C point, an ATM terminal device 1-1 of a transmission destination detects that the communication failure has occurred is a communication path and performs the same operation as the that in a reverse direction. The station 1-2 notifies the communication failure to the own management device, and a management device out of the own management range can grasp a communication failure between the C to D points. Thus, necessary counter measures can be taken.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM terminal via an ATM terminal adjacent device managed by a different manager from an ATM terminal.
AT in ATM communication system for communication between terminal stations
Regarding the alarm transfer method between the M terminal station and the ATM terminal station adjacent device,
For example, the present invention relates to an alarm transfer method between an ATM terminal station and an ATM terminal station adjacent device in an ATM communication system using an ATM terminal station and an ATM terminal station adjacent device using a 150 Mbps interface.

[0002]

2. Description of the Related Art With the spread of ATM communication, ATMs are controlled via ATM terminal station adjacent devices managed by a manager different from the ATM terminal station.
ATM communication systems for performing communication between TM terminal stations are expanding. Here, the ATM terminal station adjacent device is, for example, a network facility such as a public network or an exchange, which has a different administrator.

In such an ATM communication system, when an ATM cell is transmitted from one ATM terminal station to another ATM terminal station, if a failure occurs in an ATM terminal station adjacent device such as a communication path on the way. By notifying the transmission destination and the transmission source ATM terminal station of this fact, it is possible to take necessary measures in the transmission destination and transmission source ATM terminal station.

[0004]

However, conventionally, in the case of an ATM communication system using a 150 Mbps line between the ATM terminal station and the equipment layer adjacent to the ATM terminal station, conventionally, the ATM terminal station and the ATM terminal station adjacent device are not connected. If the network managers are different, there is no provision for forwarding an alarm to the ATM terminal station for a communication failure detected by this ATM terminal station adjacent device, and the network administrator at the ATM terminal station may take measures against the communication failure. There was a problem that it was not possible.

[0005] The present invention provides an ATM system in which a manager can easily detect a failure in a route passing through different communication routes and take necessary measures.
It is an object of the present invention to provide an alarm transfer method between a terminal station and an ATM terminal station adjacent device.

[0006]

In order to achieve the above object, the invention of claim 1 is to determine whether there is a communication failure in ATM communication from one ATM terminal station to another ATM terminal station in an ATM terminal station adjacent device. If a communication failure is detected, an alarm display signal P-A is sent from the line opposite to the detected line.
The IS is transmitted toward the destination.

Further, according to the invention of claim 2, the ATM terminal station which has received the alarm indication signal has a far-end reception failure signal P-
The FERF is transmitted to the source ATM terminal station via the ATM terminal station adjacent device.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a method for transferring an alarm between an ATM terminal station and an adjacent device of the ATM terminal according to the present invention;

FIG. 1 is a block diagram showing an embodiment of an ATM communication system to which the present invention is applied. The ATM terminal stations 1-1 and 1-2 and the ATM terminal station adjacent devices 1-3 and 1-4 are shown in FIG. SDH150Mbps (Synchronous Digital Hi
erachy 155.52Mbps). Note that, for simplicity of explanation, AT
ATM terminal station adjacent device 1 between M terminal stations 1-1 and 1-2
3, 1-4 are connected.

The ATM terminal station adjacent devices 1-3 and 1-4 are:
As described above, it refers to network equipment such as a public network or a switch managed by a different administrator from the ATM terminal stations 1-1 and 1-2.

In FIG. 1, point A-point B-point C connecting ATM terminal station 1-1 and the other ATM terminal station device 1-3.
Each of the points D-E-F is set as one communication path.

Network management devices (NMS) 1-5, 1-6 for managing the system are provided, and communication failures and the like are detected by these network management devices (NMS) 1-5, 1-6. In this embodiment, the network management device 1-5 includes two ATM terminals 1-1, 1
, And the network management device 1-6 manages the ATM terminal station adjacent devices 1-3 and 1-4.

Usually, a communication failure detected in the ATM terminal stations 1-1 and 1-2 is detected by the network management apparatus 1-5, and a communication failure detected in the ATM terminal station adjacent apparatuses 1-3 and 1-4 is determined by the network management apparatus. It can be grasped only by the device 1-6.

However, in this embodiment, as shown in FIG. 2, when a communication failure (for example, LOF / LOS / threshold error) in the direction from point C to point D occurs between C and D, The ATM terminal station adjacent device 1-4 on the point D side detects the communication failure, and responds to the detection of the communication failure by using the ATM.
The terminal station adjacent device 1-4 transmits a P-AIS (P-Alarm Indication Signal: alarm display signal) in the direction of point E, which is a communication path.

The destination ATM terminal 1-4 receives the P-AI
S is received, and it is detected that a communication failure has occurred in the communication path.

A communication failure from point D to point C (for example, L
(OF / LOS / threshold error), the ATM terminal 1-1 of the transmission destination detects the occurrence of a communication failure in the communication path by performing the same operation in the opposite direction to the above.

ATM terminal station 1 that detects a fault in the communication path
4 notifies the network management device 1-5 managing itself that a communication failure has occurred. As a result, the network management device 1-5 can recognize that a communication failure has occurred even though the area between CD and D is not within its own management range.

On the other hand, the ATM receiving the P-AIS
The terminal station 1-2 receives the P-AIS,
A FERF (P-Far End Receive Failure: far end reception failure signal) is transmitted from the point F to the transmission source toward the point E, and A
Notify the TM terminal station 1-1.

As a result, the source ATM terminal station 1-1 detects that a communication failure has occurred in the communication path to the other ATM terminal station 1-1. In this case, even if the ATM terminal station adjacent devices 1-3 and 1-4 detect the P-FERF, no action is taken. P-FE up to point A
Performs RF transmission.

Next, as shown in FIG. 4, when there is a communication failure in the direction of point B between point A and point B, the ATM terminal station adjacent device 1-3 transmits the communication failure at point B. Is detected, and the P-AIS is transmitted to the point C on the opposite side. ATM terminal station adjacent device 1
-4 detects the P-AIS at the point D, but transmits the P-AIS as it is to the point E and transmits the P-AIS as it is to the ATM terminal 1-2. ATM terminal 1-2 receives P-
AIS is detected.

ATM terminal station 1-2 receiving P-AIS
Transmits the P-FERF to the source AT in the same manner as in FIG.
It transmits to the M terminal station 1-1 and notifies the network management device 1-5 that manages its own station that a communication failure has occurred.

Next, as shown in FIG. 5, when a communication failure occurs in the direction of the point E between the points E and F, the ATM terminal station adjacent device 1-4 causes the communication failure at the point F to occur. Detect and transmit P-AIS to point D on the opposite side.

The ATM terminal station adjacent device 1-3 receives the P-
Although the AIS is detected, the P-AIS is transmitted as it is to the point B side, and the P-AIS is transmitted as it is to the ATM terminal station 1-1.

ATM terminal 1 receiving P-AIS at point A
As in the case of FIG. 3, -1 is a network that transmits P-FERF to the source ATM terminal station 1-2 and manages its own station that a communication failure has occurred between points E and F. Notify the management device 1-5.

As described above, in this embodiment, if a communication failure in the ATM communication from one ATM terminal to the other ATM terminal is detected, the alarm display signal P-AIS is transmitted from the line opposite to the detected line. Is transmitted in the direction of the transmission destination, and the ATM terminal station of the transmission destination notifies that a communication failure has occurred in the network management apparatus.
Since the FERF is transmitted to notify that a failure has occurred in the communication path to the transmission destination, the failure can be easily detected even if the failure is in a path through a different communication path by the administrator. And take necessary measures.

[0026]

As described above, according to the present invention, if a communication failure in the ATM communication from one ATM terminal to the other ATM terminal is detected, an alarm display signal is output from the line opposite to the detected line. The P-AIS is transmitted in the direction of the transmission destination, and the ATM terminal station of the transmission destination notifies that a communication failure has occurred to the network management apparatus.
Since the ERF is transmitted to notify that a failure has occurred in the communication path to the transmission destination, even if the failure is on a path through a different communication path, the administrator can easily detect the failure. And take necessary measures.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an ATM communication system to which the present invention is applied.

FIG. 2 is a diagram showing a case where a communication failure occurs in the direction from point C to point D between CD in FIG. 1;

FIG. 3 is a diagram illustrating a case where a P-FE is transmitted from a transmission destination to a transmission source when a communication failure in a direction from a point C to a point D occurs between CD and D in FIG.
The figure which shows transmitting RF.

FIG. 4 is a diagram showing transmission of a P-AIS to a transmission destination when a communication failure in the direction of point B occurs between AB in FIG. 1;

FIG. 5 is a diagram showing that a P-AIS is transmitted when a communication failure in the direction of point E occurs between EF in FIG. 1;

[Explanation of symbols]

 1-1, 1-2 ATM terminal station 1-3, 1-4 ATM terminal station adjacent device 1-5, 1-6 Network management device

Claims (2)

[Claims] An ATM managed by an administrator different from an ATM terminal.
In an ATM communication system for performing communication between ATM terminal stations via a TM terminal station adjacent apparatus, the ATM terminal station adjacent apparatus monitors whether there is a communication failure in ATM communication from one ATM terminal station to the other ATM terminal station. If a communication failure is detected, an alarm display signal is transmitted from the line opposite to the detected line in the direction of the transmission destination. 2. The ATM terminal station receiving the alarm indication signal transmits a far-end reception failure signal to a source ATM terminal station via an ATM terminal station adjacent device. 2. The alarm transfer method between an ATM terminal station and an ATM terminal station adjacent device according to 1.