JPH02272936A - Loop-shaped communication network - Google Patents

Abstract

PURPOSE:To speedily and exactly detect a spot, where a fault is generated, by sending positive logical data and negative logical data, which include system designation information and self-station address information, by using a specified control channel and checking these data. CONSTITUTION:A 0-system loop-shaped optical transmission line 5 turns around control data according to the specified control channel and a 1-system loop- shaped optical transmission line 6 turns around the control data according to the specified control channel. The turning direction of the control data to be transmitted by the specified control channel is made mutually reverse for the optical transmission lines 5 and 6. Control data 50-53, 60-63 are composed of the positive logical data and negative logical data and the positive and negative logical data are respectively composed of the system designation information and self-station address information. The positive logical data and negative logical data are checked and in the case of an error, positive and negative check error information are outputted. Thus, the spot, in which the fault is generated, can be speedily and exactly detected.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention connects a central station device and a plurality of terminal station devices that are distributed and subordinated to the central station device by a loop-shaped transmission line with a duplex configuration. Relating to a circular communication network.

[Conventional technology]

Conventionally, in this type of ring communication network, when one system of a certain end station fails, and the transmission paths of the 0 system and 1 system run in opposite directions, the system control section of the central station equipment controls the 0 system. The central station device control unit of system 1 sends positive logic data (A) and negative logic data (A) of the control data on a specific control channel, and each terminal station device receives the data in order. , negative logic data is checked to detect a transmission path failure between the central office equipment and the terminal equipment. Also,
The positive and negative logic data returns to the central station equipment, and the central office equipment also checks the positive and negative logic data to detect faults in the transmission path. Individual polling is performed on the station equipment to detect bypass failures, etc. in the terminal equipment.

[Problem to be solved by the invention]

In a ring communication network that performs fault detection as described above, when a transmission path failure occurs at a certain terminal station, similar transmission path failures occur at each terminal station up to the central station, and it is difficult to locate the location of the failure. There is a problem that it becomes unclear and that it takes a long time to detect the terminal device bypass.

[Means to solve the problem]

The present invention includes a central station device that monitors and controls an entire communication network, a plurality of terminal station devices subordinate to the central station device, and a loop-shaped transmission line with a duplex configuration that connects the central station device and the plurality of terminal station devices. In the ring communication network, each of the central station device and the plurality of terminal devices transmits system designation information and address information of its own station through a specific control channel that circulates in opposite directions through the loop-shaped transmission path of the duplex configuration. means for sending positive logic data and negative logic data including the above to a subsequent station device; means for receiving the positive logic data and the negative logic data of the specific control channel sent from the preceding station device; means for checking the received positive logic data to detect a transmission line data failure between station devices; and checking the system designation information of the received positive logic data and the negative logic data and system information of the own station device. means for detecting whether or not the transmission path is in a loopback state, and comparing address information of the previous station device stored in advance with the address information of the received positive logic data and the received negative logic data; and means for detecting whether the preceding station device is in a bypass state or the own station device is in a loopback state.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIG. 1 showing one embodiment, the ring communication network includes a central station (CS) 1 that monitors and controls the entire optical communication group, and a plurality of central station devices (CS) 1 that are subordinate to the solid-state device 1 and that monitor and control the accommodated terminal lines. Terminal equipment (TDSI, TDS2.TDS3) 2, 3.4
and 0 that connects the central office equipment 1 and the terminal equipment 2, 3.4.
The loop-shaped optical transmission lines 5 and 6 have a duplex configuration of a system and a single system.

The solid equipment 1 includes a system control unit (SYSCTL) 10 and a redundant system 0 and 1 central office equipment control unit (C8CTLO).
, C3CTLI) 11.12. Also,
The terminal station devices 2.3.4 each have a redundant configuration 0-system terminal station control unit (TDSICTLO, TDS2CTLO, TD
S3CTL○) 21.31.41 and 1 system terminal equipment control unit (TDSICTLI, TDS2CTL1.TDS3C
TLl) 22, 32.42. 0 system central station equipment 5 control section 11 and 0 system terminal station equipment control section 21゜31.41
are connected by an O-thread loop-shaped optical transmission line 5, and the 1st system solid device control section 12 and the 1st system end station device control section 22, 32, 42.
and is connected by a system 1 loop optical transmission line 6.

In this configuration, for early detection of failure locations,
The 0-system loop optical transmission line 5 circulates control data using its specific control channel, and the 1-system loop optical transmission line 6 circulates control data using its specific control channel.

The circulation directions of control data transmitted through a specific control channel are opposite to each other on the optical transmission lines 5 and 6. FIG. 2 shows the format of control data between each station device. The control data 50, 51, 52, 53, 60, 61, 62゜63 are composed of positive logic data and negative logic data, and the positive and negative logic data are system designation information (ID) and own station address information (ADR3), respectively. ).

In this embodiment, the address of the central office device 1 is AD
R3=O, and the addresses of terminal devices 2, 3, and 4 are ADR3=1.2.3, respectively.

The terminal devices 2, 3.4 in FIG. 1 have the same configuration,
The details of the terminal device 2 are shown in FIG. 3 using the terminal device 2 as an example.
, the control data 50 is received by the 0-system optical control unit (OPTCONTO>8) through a specific control channel and converted into an electrical signal, and then the control data 50 is sent to the control unit (TDSCONTO) 211.
sent to.

In the control unit 211, a positive/negative data check unit (CHCHK) 21 checks positive logic data and negative logic data.
2 is performed, and in case of an error, outputs sign/negative check error information. The central station device 1 can recognize a transmission path failure based on the positive/negative check error information. In addition, an address comparison unit (ADRSC) that stores address information of the previous station device
By checking in MP) 213 whether or not it is the same as the own station address information in the data 50, it becomes clear whether or not the previous station device is in a bypass state. If the values are different, address error information is output. Next, the system specification check section (
ID CHK) 214 checks whether it is received from the 0 system or from the 1 system, and it can be seen from the ID error information output in the case of an error that it is in a loopback state.

Positive/negative check error information, address error information and ID
The error information is sent to the control unit (TD) of the terminal station control unit 22 of system 1.
S C0NT1) 221 and 1 system optical control unit (OPT
C0NTI) 220 to the system control unit 10 of the central office device 1.

Further, control data 51 to be sent to the subsequent station device is created by inputting system designation information and own station address information to the positive/negative data sending control section 215, and is sent to a specific control channel of the optical transmission line 5. Note that the O-system and 1-system central office device control units 11 and 12 of the central office device 1 have basically the same configuration as the O-system and 1-system terminal station device control units 21 and 22 of the terminal station device 2 described above.

〔Effect of the invention〕

As explained above, according to the present invention, by sending positive logic data and negative logic data including system designation information and own station address information using a specific control channel and checking these data, failures can be detected. Not only can the location of the occurrence be detected accurately, but also bypass and loopback states can be quickly detected.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing control data in the same embodiment, and FIG. 3 is a detailed block diagram of a terminal device in the same embodiment. DESCRIPTION OF SYMBOLS 1...Central station device, 2,3.4...Terminal station device, 5°6...Loop-shaped optical transmission line, 10...System control unit, 11, . 12...Solid device control unit, 21, 22, 3
1゜32.41.42...terminal device control section, 50,5
1゜52.53, 60, 61, 62.63...Control data, 210,220...Light control section, 211.221
...Control unit, 212...Positive/negative data check unit, 2
13...Address comparison unit, 214...System designation check unit, 215...Positive/negative data transmission control unit. Valve! sword

Claims (1)

[Claims] A circular communication system comprising a central station device that monitors and controls an entire communication network, a plurality of terminal station devices subordinate to the central station device, and a loop-shaped transmission line with a duplex configuration that connects the central station device and the plurality of terminal station devices. In the network, each of the central station equipment and the plurality of terminal equipments transmits a true signal containing system designation information and address information of its own station via a specific control channel that circulates in opposite directions through the loop-shaped transmission path of the duplex configuration. means for transmitting logic data and negative logic data to a downstream station device; means for receiving the positive logic data and negative logic data of the specific control channel transmitted from the preceding station device; a means for checking logical data to detect a transmission line data failure between station devices; and a means for checking the system designation information of the received positive logic data and the negative logic data and the system information of the own station device for transmitting the data. means for detecting whether or not the path is in a loopback state; and a means for detecting whether or not the path is in a loopback state; 1. A ring communication network comprising: means for detecting whether a station device is in a bypass state or its own station device is in a loopback state.