JPS6116647A - Fault recognition system - Google Patents

Abstract

PURPOSE:To prevent an error in the recognition of a fault due to an extending fault by sending an extending fault removal signal out of a center station as to the fault recognition system of an optical communication network. CONSTITUTION:If a fault occurs, the light instantaneous fault of a system 1 is latched in an extending fault factor register (ALMREG1)12 and an extending fault factor is latched in (ALMREG3)14. Then, when said extending fault removal signal (CTL)18 is received by a 0-system terminal device control part (TDS2, 0)7, it is checked whether the bit of an initial head ALM is set or not and when so, the extending fault factor register (ALMREG2)13 is reset to remove the factor. The terminal device control part (TDS3, 0)9 of the system 0 is operated similarly. Namely, an extending fault removal signal (CTL)18 is sent out of the central device by setting the initial head LAM bit to ''0'', and the bit is set when an initial fault occurs, thereby removing the extending fault factor by using the signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a failure recognition method in an optical communication network, and in particular, the present invention relates to a failure recognition system in an optical communication network, and in particular, the entire optical communication network has a double loop configuration and includes a central station and a plurality of distributed terminal stations subordinate to the central station. This invention relates to a monitoring and control method for preventing erroneous recognition of status information regarding the influence of an instantaneous failure of one terminal station on another terminal station in a ring communication network connecting two terminal stations.

Conventionally, in this type of status information collection monitoring control, the central station (C8) sequentially sends a zero to the O system loop via a specific control channel to each end station device having a fixed number that does not match. Polling control is performed with the terminal station fixed number specified in the system loop, and the status information of the other system (1 system) stored in the terminal station 0 system is collected, and then the collected terminal station 0 system erases the contents of the status information and starts storing it again in preparation for the next polling. A similar operation was performed for the 1st system loop, and the central station equipment simply monitored the information of each terminal station and displayed the content of the information as an external output. Therefore, when there is an instantaneous failure in one end station, especially in the optical system, it affects all the end stations located further ahead, and due to the instantaneous optical disturbance at one end station, All of them are displayed on the central office equipment as if a fault has occurred, making it difficult to accurately recognize the fault.

According to the present invention, from the central office equipment to all the terminal equipment,
The above-mentioned drawbacks of the conventional method can be solved by leaving only the information about the origin of the failure, and erasing the information about the failure that has affected the cause by sending a spillover failure removal signal before polling the terminal station. The purpose of this invention is to provide a fault recognition method that eliminates the problem and prevents erroneous recognition of the location of the fault.

For this purpose, the present invention provides a central office device that monitors and controls the entire optical communication network and a plurality of end station devices that monitor and control accommodated terminal lines, and that a central office device that monitors and controls the entire optical communication network and a plurality of end station devices that monitor and control accommodated terminal lines are arranged in a distributed manner, and that the central office device, the end station devices, and the transmission path are connected to each other. It has a double loop transmission line with a dual system configuration of 0 system and 1 system, and monitors and controls fault information on the θ system and 1 system side of the terminal equipment belonging to the 0 system and 1 system, respectively. In this fault recognition system, the central station equipment performs polling control via a specific control channel for each end station device having a fixed number that does not match, and the O system reports the status of the 1 system, and the The system monitors the status of the O system and displays it on the central station device, and from the central station device to the end station device, the ripple factor failure item leaves only information about the origin of the failure, and the information that has affected the system since then. Regarding fault information, means is provided to send out a spillover fault removal signal to eliminate the fault information before polling the terminal station.

In other words, in a transmission line with a dual system configuration of O system and I system, when monitoring and controlling fault information on the 0 system and 1 system side, respectively, of the end station devices belonging to the double loop transmission path, there will be a mismatch. Polling control for specifying the fixed number of the terminal station included in the O-system loop is performed for the O-system loose and the O-system loop via a specific control channel from the central station device to the terminal devices each having a fixed number. The central station device collects the status information of the other system, that is, the 1 system, which is stored in the terminal station device 0 system. Thereafter, the collected terminal station (O system) erases the contents of the status information, prepares it for the next polling, and starts storing it again. A similar operation is performed for the 1st system loose. However, in a loop transmission line, as mentioned above, due to the loop-like relationship, an instantaneous optical failure at one end station will affect all the end stations placed ahead of it, resulting in an instantaneous optical disturbance at one end station. Therefore, there is a drawback that the polling is collected and displayed at the central station equipment as if a failure has occurred in all the terminal stations beyond that point. Therefore, in the present invention, only the information on the origin of the fault is left from the central office equipment to the terminal equipment regarding the ripple cause fault, and a ripple fault removal signal is sent to the end station equipment before pony-ing the end station with respect to the fault information that has affected the equipment since then. By erasing the information, it is possible to prevent misrecognition of the location where the fault has occurred.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of the loop communication network according to the present invention, and FIG. 2 is a diagram showing the configuration of the loop communication network shown in FIG. It is a figure showing an example. This loop communication network consists of central office equipment (C
8) O system central control unit (C8O
) 2.1 system central control unit (C8I) 1, system control unit (SYS) 3 that performs double loop fault monitoring, and terminal station control units (TDSl, 1) 4 for a plurality of terminal station devices, ( TDS
I,0)5゜(TDS2,1)6,(TDS2,0
)7 , (TDS3,1)8 and (TDS3,0)9
Each of the θ system and 1 system is an optical transmission line (0 system loop) 11.
Similarly (1 system loop) 1oI/c is connected in a 92-fold loop.

If an instantaneous optical failure occurs here, for example, if light is lost on the l-system loop output side of the terminal station control unit (TDsl, 1) 4, the terminal station control unit (TDS2.
1) A ripple failure occurs in the receiving unit of 6 and the receiving unit of terminal device control unit (TDS 3, 1) 8. For this reason, when the central station system (SYS) 3 performs terminal station polling and displays the collected information, it will appear as if a failure has occurred in a plurality of terminal stations connected to the 1-system loop.

FIG. 3 is a diagram showing an example of a system configuration of a fault recognition method according to the present invention. The function of accurately recognizing a fault in FIG. 2 will be explained with reference to this diagram.

In this system, polling is performed in order starting from 1 to collect information. First, the failure in the 1st system loop that occurred in Figure 2 is collected by polling of other systems, so
Failure information of the first system is latched in the register of the system. In the case of the failure shown in Figure 2, as shown in the upper part of Figure 3, the optical instantaneous failure of the VC1 system is latched in the trap propagation failure cause register (ALMREGI) 12,
REG2) 13° (ALMRKG3) 14 latches the ripple failure factor. For failures that do not cause spillover failures: Non-spread failure cause register (STA) 15.16.
17. Therefore, each time terminal station polling is performed for one terminal station at a time, a spillover interference removal signal (CTL) 18 is loosely sent to the central station system (SYS) 3 in the PO system and the I system. 0
When the ripple fault removal signal (CTL) 18 is input to the terminal station equipment (TDSI, 'O) 5 of the system, the terminal station detects the signal 18 and sets the initial leading ALM (alarm) pit to 1. and sends it to the next terminal station. Next, the 0 yarn end station device control unit (TDS2゜0) 7 receives the ripple failure removal signal (C
When TL) 18 is received, it is checked whether the initial leading ALM Vc pit is set, and if it is set, the ripple failure cause register (ALMREG2) 13 is reset and removed. O-system terminal device control unit (TDS3,0)
The same thing is done for 9Vc. In other words, a ripple failure removal signal (CTL) '18 is sent from the central station equipment with the initial leading ALM bit set to "0", and is set where an initial failure has occurred, and that signal is used to remove the ripple failure cause. do. In this way, failure information can be reliably collected when polling is performed.

As explained above, according to the VC and the present invention, by sending out a spillover failure removal signal from the central office device, it is possible to prevent erroneous recognition of a failure due to a spillover failure factor.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of a loop communication network according to the present invention, FIG. 2 is a diagram showing the state when an instantaneous optical failure occurs in the loop communication network configuration of FIG. 1, and FIG. 3 is a diagram showing the present invention. 1 is a diagram showing an example of a system configuration of a failure recognition method according to the invention. DESCRIPTION OF SYMBOLS 1... 1-system central control unit of the central station equipment, 2... 0-system central control unit of the central station equipment, 3... System control unit of the central station equipment, 4.6.8... 1-system central control unit 5. terminal device control unit;
7.9...0 system terminal equipment control unit, 10...1 system optical transmission line, 11...0 system optical transmission line, 12.13.1
4...Ripple failure factor register, 15.16.17...
- Non-spread failure factor register, 18... Spread failure removal signal.

Claims (1)

[Claims] A central station device that monitors and controls the entire optical communication network and a plurality of terminal devices that monitor and control the accommodated terminal lines are distributed, and the central station device, terminal station devices, and transmission paths are connected to two systems, 0 system and 1 system.
It has a double loop transmission line with a double system configuration, and the 0 system and 1 terminal station equipment belonging to this double loop transmission line are connected to each other.
In the fault recognition method that monitors and controls fault information on the system side,
The central station equipment performs polling control via a specific control channel for each end station device having a fixed number that does not match, and the 0 system shows the status of the 1 system, and the 1 system shows the status of the 0 system. means for monitoring and displaying on the central station equipment, and a means for monitoring and displaying the information on the central station equipment from the central office equipment to the terminal equipment, for ripple cause failure items, only information on the origin of the failure is left, and information on failures that have affected since then is displayed on the terminal equipment. 1. A fault recognition method comprising means for transmitting a spillage fault removal signal to eliminate the problem before polling.