JPH0775350B2 - Ring communication network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention connects a central office device and a plurality of terminal devices distributed in a subordinate manner to the central office device by a looped transmission line having a duplex configuration. It relates to a ring communication network.

[Conventional technology]

Conventionally, in a ring communication network of this type, if the transmission paths of the 0-system and the 1-system are opposite to each other at the time of one-sided failure of a certain terminal device, the 0-system is controlled by the system controller of the central station device. And, the positive logic data (A) and the negative logic data (A) of the control data on the specific control channel are sent from the central station device control unit of the 1-system, and each terminal device receives the data in order and the positive logic data (A) is received. , The negative logic data is checked to detect a transmission line fault between the central station device and the terminal device. Also,
The positive and negative logic data are returned to the central station device, and the central station device also checks the positive and negative logical data to detect the failure of the transmission line, and the system controller of the central station device sets 0.
Individual polling is performed on each terminal equipment of the system and the 1-system to detect a bypass failure of the terminal equipment.

[Problems to be Solved by the Invention]

In the ring communication network that performs fault detection as described above, when a transmission line fault occurs in a certain terminal device, the same transmission line fault occurs in each terminal device up to the central station device,
There is a problem that the location of the failure is unclear and it takes a long time to detect the bypass of the terminal device.

[Means for Solving the Problems]

The present invention comprises a central station device that monitors and controls the entire communication network, a plurality of terminal station devices that are subordinate to the central station device, and a looped transmission line having 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 end station devices has its own system designation information and its own station address information through a specific control channel that circulates the looped transmission line of the duplex configuration in opposite directions. Means for sending positive logic data and negative logic data including the following to the succeeding station apparatus, means for receiving the positive logic data and the negative logic data of the specific control channel sent from the preceding station apparatus, and receiving Means for checking the positive logic data and detecting a transmission line data failure between station devices, the system designation information of the received positive logic data and negative logic data, and the own station device. Means for checking whether or not the transmission path is in a loopback state by performing a check with the system information, and the address information of the preceding station device stored in advance, the received positive logic data and the negative logic. Means for comparing the address information of the data and detecting whether the preceding station device is in the bypass state and the local station device is in the loopback state.

〔Example〕

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

Referring to FIG. 1 showing an embodiment, a ring communication network comprises a central station device (CS) 1 for monitoring and controlling the entire optical communication network, and a plurality of terminals subordinate to the central device 1 for monitoring and controlling accommodated terminal lines. Stationary devices (TDS1, TDS2, TDS3) 2, 3, 4 and a loop-shaped optical transmission line 5, 6 of a duplicated configuration of 0 system and 1 system for connecting the central station device 1 and the terminal station devices 2, 3, 4 With. The central unit 1 is composed of a system control unit (SYSCTL) 10 and a 0-system and 1-system central station device control units (CSCTLO, CSCTL1) 11 and 12 in a redundant configuration.
Also, the terminal devices 2, 3 and 4 are respectively redundant system 0 terminal device control units (TDS1CTLO, TDS2CTLO, TDS3CTLO) 21, 31, 41 and 1 system terminal device control units (TDS1CTL1, TDS2CTL1, TDS3CTL1).
It consists of 22,32,42. 0 system central station device control section 11 and 0
The system terminal equipment control units 21, 31, 41 and 0 system loop optical transmission line 5
The 1-system central device control unit 12 and the 1-system terminal station device control units 22, 32, 42 are connected by the 1-system loop optical transmission line 6.

In this configuration, for early detection of failure occurrence point,
The 0-system loop-shaped optical transmission line 5 circulates control data by its specific control channel, and the 1-system loop-shaped optical transmission line 6 circulates control data by its specific control channel.
The circulation directions of control data transmitted by a specific control channel are opposite to each other on the optical transmission lines 5 and 6. The format of the control data between the station devices is shown in FIG. Control data 5
0, 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 respectively from system designation information (ID) and own station address information (ADRS). Become. In this embodiment, the address of the central office device 1 is ADRS = 0.
And the addresses of the terminal devices 2, 3 and 4 are ADRS = 1 and
A few.

The terminal station devices 2, 3, and 4 in FIG. 1 have the same configuration, and the details thereof are shown in FIG. 3 by taking the terminal station device 2 as an example. In the terminal device 2, the control data 50 is received by the 0-system optical control unit (OPTCONT0) 8 through a specific control channel, converted into an electric signal, and then sent to the control unit (TDSCONT0) 211. In the control unit 211, a positive / negative data check unit (CHCHK) 212 checks positive logic data and negative logic data, and outputs positive / negative check error information in the case of an error. Central station equipment 1
Can recognize a transmission line failure from the positive / negative check error information. Also, by checking whether the address comparison unit (ADRS CMP) 213, which stores the address information of the preceding station device, is the same as the own station address information in the data 50, the preceding station position is in the bypass state. It turns out if there is. In case of a non-single value, address error information is output. Next, whether the system designation check unit (ID CHK) 214 received from system 0 1
It is checked if it is received from the system, and it can be seen from the ID error information output when there is an error that it is in a loopback state. The positive / negative check error information, the address error information, and the ID error information are the control unit (TDS CONT1) 221 of the 1-system terminal station control unit 22 and the 1-system optical control unit (OPT CONT
1) It is transmitted to the system control unit 10 of the central office device 1 via 220. Further, the control data 51 to the succeeding station device is created by inputting the system designation information and own station address information to the positive / negative data transmission control unit 215, and is transmitted to a specific control channel of the optical transmission line 5. It should be noted that the 0-system and 1-system central station device control units 11 and 12 of the central station device 1 are the 0-system of the above-mentioned terminal station device 2.
Also, the configuration is basically the same as the 1-system terminal station device control units 21 and 22.

〔The invention's effect〕

As described above, according to the present invention, the positive logic data and the negative logic data including the system designation information and the local station address information are transmitted by using the specific control channel, and by checking these data, the failure Not only can the location of occurrence be accurately detected, but the bypass and loopback states can be quickly detected.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing control data in the embodiment, and FIG. 3 is a detailed configuration diagram of a terminal station device in the embodiment. 1 ... Central station equipment, 2,3,4 ... Terminal equipment, 5,6 ... Loop optical transmission line, 10 ... System control section, 11,12 ... Central apparatus control section, 21,22, 31,32,41,42 ... Terminal device controller, 50,
51,52,53,60,61,62,63 ...... Control data, 210,220 ...... Optical control part, 211,221 ...... Control part, 212 ...... Positive / negative data check part, 213 ...... Address comparison part, 214 ...... system Designated check unit, 215 ... Positive / negative data transmission control unit.

Claims (1)

[Claims] 1. A central office device that monitors and controls the entire communication network, a plurality of terminal devices that are subordinate to the central office device, and a loop transmission line having a duplex configuration that connects the central office device and the plurality of terminal devices. In the ring communication network including, each of the central station device and the plurality of terminal station devices, the system designation information of its own station and its own station by a specific control channel that circulates the looped transmission line of the duplex configuration in mutually opposite directions. Means for sending positive logic data and negative logic data including address information to the succeeding station apparatus; means for receiving the positive logic data and the negative logic data of the specific control channel sent from the preceding station apparatus Means for checking the received positive logic data and detecting a transmission path data failure between the station devices, and the system designating information of the received positive logic data and the negative logic data Means for performing a check with the system information of the device to detect whether the transmission line is in a loopback state, address information of the preceding station device stored in advance, the received positive logic data and the negative A ring communication network comprising means for comparing the address information of logical data with each other to detect whether the preceding station device is in a bypass state or the local station device is in a loopback state.