JPH05292107A - Fault information transmission system and method for optical transmitter having ring network - Google Patents

Abstract

(57) [Abstract] [Purpose] Each node is composed of a line layer, a section layer, a path layer and a main data area, which are transmitted through two optical transmission lines having opposite transmission directions. When data is received, conversion between optical and electrical signals is performed, line layer and path layer are monitored for errors, termination processing by instructions, multiplexing processing, detection of fault information, etc. Regarding the failure information transmission method and method of an optical transmission device having a ring network for terminating the path layer by selecting the optical transmission path that does not detect the optical path and connecting it to the subscriber device group, reliably transmit the failure information to the opposite station. The purpose is to provide a reliable and easy-to-use device. [Configuration] Whether or not an error has been detected in the path layer of only one system, and if an error is detected in only one of the paths, fault information is newly added to the path layer in which no error is detected. It is configured to be included in the path layer and to be instructed to be transmitted on the optical transmission line and transmitted to the opposite station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault information transmission method and method for a transmission device having a ring network for performing transmission control such as multiplexing of transmission data, and more particularly to each node in which the transmission direction of the transmission data is When receiving the transmission data formed by the management data area composed of the line layer, the section layer and the path layer and the main data area used by the subscriber, which are transmitted through the optical transmission paths of the two systems opposite to each other, Converts optical signals and electrical signals, monitors the line layer and the path layer for errors, performs termination processing by instructions, multiplex processing, detects fault information, etc., and does not detect errors in the path layer. The present invention relates to a failure information transmission system and method for an optical transmission device having an annular network that selects an optical transmission line to connect to a group of subscriber devices and terminates a path layer according to an instruction. The present invention is based on SONET (Synchronous Optica
l NetWork (optical transmission) ring using a device (RING structure)
The present invention relates to a failure information transmission method and method for an optical transmission device having the above network.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Regarding transmission data formed of a management data area including a section layer and a path layer and a main data area used by a subscriber, conversion between optical signals and electric signals, error monitoring of the line layer, and termination processing. LTE to do etc.
(Line Terminate Equipment) 1
w, 1e, reception of the path layer, termination processing by instruction,
And STS (Synchronous Tran) that detects fault information.
sport Signal) -PTE (Pass Layer Terminator) 92w, 9
2e, PPMs (error detection units) 3w and 3e for detecting an error in the path layer of received transmission data, and an optical transmission line (optical fiber) for which an error in the path layer is not detected
And a receiving STS path layer selecting section 4 for selecting and connecting to the subscriber system device group.

Here, the "line layer" means, for example, FIG.
As shown in Figure 6, data contained in the line area of the transmission data (for example, 6 rows, 9 columns), such as data communication information, line switching information, and quality information (facili
ty) and error information.
It ends with. Also, "section layer" means
Data included in the transmission data section area (for example, 3 rows, 9 columns) and used for data communication to list frame information and game information.
It contains channel information and SV (SURVEILLANCE) information, and REG (Regenerator; Section).
Termi-nate Equipment). The “pass layer” is included in the pass layer area (for example, 12 rows, columns) of the transmission data, and
It is terminated by E (Path Terminate Equipment), and it has error information inside each node, game alarm (Yellow) and game performance monitor (Performance Monito).
It contains fault information such as FEBE (Far Block Error) carrying the number of parity errors of the game, which is data for monitoring r), and SV device information.
The "pass layer" includes "STS pass layer" and "VT pass layer".
And a multiplex of VT pass layers is shown in FIG. Further, “termination” means that the data included in the received transmission data is taken in and subjected to a predetermined process such as error processing or transfer to an SV device, etc., and is newly transferred from the SV device or the subscriber system. The data is written in the transmission data to instruct the transmission. Further, as shown in FIG. 5, each node 11, 102, 103, 104, 10
Reference numeral 5 denotes a ring-shaped optical transmission line (optical fiber) connection, a node 11 is a branch node, and its configuration is shown in FIG.
Unlike the normal node, there is no STS path layer and the STS path layer does not terminate.

Next, the operation of each node of the optical transmission device having the ring network according to the conventional example will be described. A management data area composed of a line layer, a section layer, and a path layer, and a main data area used by a subscriber, which are transmitted to each node via two optical transmission lines whose transmission directions are opposite to each other. When receiving the transmission data formed from the LTE, the LTEs 1w and 1e convert the transmission data represented by the optical signal into an electric signal. Furthermore, the LTE1
The w and 1e take in the line layer of the transmission data, monitor the line layer for errors, and perform processing such as transfer to the SV device. The PTEs 92w and 92e are respectively
The path layer of the transmission data of the same origin received from the opposite direction is taken in and multiplexed, and the PPMs 3w and 3e detect the error. At this time, the reception STS path layer selection unit 4 selects the optical transmission path in which no error is detected based on whether or not an error is detected in the path layer in each PPM 3w, 3e, and the subscriber system is selected. It is connected to the device group 52. After that, if there is an instruction from the interface 50,
For the path layer received from the optical transmission line in which no error was detected, the fact that no error was detected was included in the new path layer and transmitted, and the path layer received from the optical transmission line in which an error was detected With respect to the above, a game alarm (Yellow), which is failure information indicating that an error has been detected, is included and transmitted to each transmission source game device through each optical transmission path.

[0005]

An optical transmission device having a ring network according to a conventional example, for example, one of the optical transmission devices having a ring network as shown in FIG.
When one node 11 has a branch node that branches to another extension node 105, for example, as shown in the configuration of the branch node 11 shown in FIG.
There is no PTE (pass layer terminator) and the pass layer is not terminated, but LTE 21w, 21e and PPM 23w, 23e
Then, whether or not an error is detected in the path layer is monitored by the PPMs 3w and 3e, and the optical transmission line in which the error is not detected is selected (when no error is detected on both the w side and the e side, , Any side is selected), expansion node 1
05 and the path layer selector 24 to be connected. When the branch node 11 is provided in an optical transmission device having a ring network, for example, the node 10
2, when an error is detected in the path layer of the transmission data received only on the w side from the expansion node 105 of the transmission source, which is a game, the path layer of the transmission data received on the e side and the subscriber system group The path layer of the transmission data which is connected to the terminal 52, is terminated, and is sent to the e side contains information indicating that no error is detected, and the information is transmitted to the expansion node 105 which is the game. On the other hand, on the w side, transmission information (Yellow), which is information indicating that an error has been detected in the path layer, is included and transmission data is transmitted to the competition. At that time, if the reception STS path layer selection unit 24 of the branch node 11 happens to be connected to the w-side optical transmission line of the branch node 11, the e-side includes the game alarm (Yellow). The transmission data cannot be transmitted to the expansion node 105, which is the other game, and the failure cannot be dealt with immediately, which is vulnerable to the failure and has the problems of poor reliability and usability.

Therefore, according to the present invention, when a failure occurs, failure information such as a game alarm can be transmitted to the other party's game, and the failure can be immediately dealt with, and it is resistant to the failure, reliable and easy to use. The purpose of the present invention is to provide an optical transmission device having a good ring network.

[0007]

In order to solve the above technical problems, the first invention, as shown in FIG. 1, is a management data area including a line layer, a section layer and a path layer,
Also, the line layer terminators 100w and 100e that perform conversion between optical signals and electric signals, monitoring of errors in the line layer, termination processing, and the like for transmission data formed from the main data area used by the subscriber, and the path layer. Of the path layer terminating devices 200w and 200e that perform reception of data, termination processing according to instructions, and detection of fault information, and error detection units 300w and 30 that detect errors in the path layer of received transmission data.
0e, the path layer selection unit 4 for selecting the optical transmission line in which no error is detected in the path layer and connecting it to the subscriber group of devices.
In an optical transmission device having a ring network in which each node having transmission lines 00 and 00 is connected by two optical transmission lines whose transmission directions are opposite to each other, One-sided error monitoring unit 6 that monitors whether or not an error is detected in the path layer of only the transmission path
00 and an error is detected only in the path layer received from the optical transmission line of one of the systems, the path layer termination devices 200w and 200e in which no error is detected are also included in the path layer. The error information sending instruction unit 700 includes an error information indicating that an error has been detected in a new path layer and gives an instruction to send the error information to the optical transmission line.

A second aspect of the present invention is, as shown in FIG. 2, a line layer, a section layer, and a path in which each node transmits data through two optical transmission lines whose transmission directions are opposite to each other. Upon receiving the transmission data formed by the management data area consisting of layers and the main data area used by the subscriber, the conversion between the optical signal and the electric signal is carried out, and the line layer and the path layer are monitored by the error and indicated by the instruction. Performs termination processing, multiplexing processing, detection of fault information, etc. (S
1) and select the optical transmission line of the system in which no error is detected in the path layer and connect it to the subscriber system device group (S2),
In an optical transmission device having a ring network that terminates the path layer according to an instruction, was an error detected in the path layer received by the optical transmission line of only one of the transmission data transmitted through the two optical transmission line sections? If the error in the path layer is detected in the transmission data of only one side, (S
3) If no error is detected, the selected path layer also includes fault information indicating that an error has been detected in the new path layer, and the fault information is sent out on the optical transmission line and transmitted to the opposite station. An instruction is given (S4).

A third aspect of the invention is, as shown in FIG. 3, a management data area including a line layer, a section layer and a path layer,
Also, the line layer terminators 100w and 100e that perform conversion between optical signals and electric signals, monitoring of errors in the line layer, termination processing, and the like for transmission data formed from the main data area used by the subscriber, and the path layer. Of the path layer terminating devices 200w and 200e that perform reception of data, termination processing according to instructions, and detection of fault information, and error detection units 300w and 30 that detect errors in the path layer of received transmission data.
0e, the path layer selection unit 4 for selecting the optical transmission line in which no error is detected in the path layer and connecting it to the subscriber group of devices.
In the optical transmission device having an annular network in which each node having a transmission line 00 is connected by two optical transmission lines whose transmission directions are opposite to each other, FEB for detecting FEBE which is failure information indicating the number of parity errors in the path layer
A circular network including an E detection unit 710 and an FEBE transmission instruction unit 770 that includes the detected FEBE in a path layer of transmission data transmitted through two optical transmission lines to instruct transmission. With.

A fourth aspect of the present invention is, as shown in FIG. 4, a line layer, a section layer and a path in which each node is transmitted via two optical transmission lines whose transmission directions are opposite to each other. Upon receiving the transmission data formed by the management data area consisting of layers and the main data area used by the subscriber, the conversion between the optical signal and the electric signal is carried out, and the line layer and the path layer are monitored by the error and indicated by the instruction. Performs termination processing, multiplexing processing, detection of fault information, etc. (S
1) and select the optical transmission line of the system in which no error is detected in the path layer and connect it to the subscriber system device group (S2),
In an optical transmission device having a ring network terminating the path layer according to an instruction, the number of parity errors in the path layer received via an optical transmission line connected to the subscriber group of devices selected as an error is not detected. FEBE, which is the failure information indicating the FEBE, is detected (S13), and the detected FEBE is included in the path layer of the transmission data transmitted through the two optical transmission lines to instruct the transmission (S14). ..

[0011]

The operation of the first and second inventions will be described.
In step S1, the transmission data transmitted in the reverse direction from the game of the same origin formed from the management data area including the line layer, the section layer, and the path layer, and the main data area used by the subscriber are terminated in the line layer termination. Device 200w,
200e receives each. The pass layer termination device 200
Reference numerals w and 200e respectively convert the received transmission data from optical signals to electrical signals. The line layer terminator 100w, 1
00e takes in a line layer, performs a predetermined process, and then includes a new line layer in the transmission data. Further, the path layer terminators 200w and 200e take in the path layer of the received transmission data, perform multiplexing and predetermined processing. In step S2, the error detection units 300w and 30
0e detects a path layer error. As a result, the path layer selection unit 400 selects the optical transmission line in which no error is detected, and connects it to the subscriber system device group.

At step S3, the one-sided error monitoring unit 6
00 monitors whether or not an error in the path layer is detected in the path layer of only one of the transmission data transmitted in the opposite directions through the optical transmission line, and the transmission data of the error in the path layer is only one. If the error is detected in step S4, the failure information transmission instructing unit 700 includes failure information indicating that no error has been detected and that an error has also been detected in the selected path layer. The new path layer is included in the transmission data, and an instruction to send it out on the optical transmission line is given. Therefore, fault information such as game alarms is sent out not only in the direction in which the error was detected, but also in the optical transmission line in the selected direction where no error was detected, so that the fault information can be reliably transmitted to the game. You will be able to In addition, "fault information"
And, for example, game alarm (Yellow) and FEBE (Far
EndBlock Error) is the information that indicates that a failure has occurred in the path layer. The pass layer includes an STS pass layer and a VT pass layer. If no error is detected in either of them, the path layer in any direction is selected. If both detect an error, it will be reported as a failure.

On the other hand, the operation of the third and fourth inventions will be described. This example is similar to the first and second inventions,
The same applies from step S1 to step S2. Then, in step S13, the reception path layer selection unit 400
FEBE (Far End Bloc), which is the fault information contained in the path layer connected to the subscriber device group selected by
k Error) is detected by the FEBE detection unit 710. In step S14, the detected FEBE is also included in the path layer that is not selected, and the FEBE is transmitted.
The BE transmission instruction unit 770 gives an instruction. Therefore, the transmission data of the path layer containing the FEBE of the selected path layer is transmitted to both of the optical transmission paths. Therefore, it is possible to monitor the normality / abnormality of the error detection units 300w and 300e, which results in that no error is actually detected.

[0014]

EXAMPLES Examples of the present invention will be described. FIG. 5 shows an overall block diagram of an optical transmission device having a ring network according to this embodiment. As shown in FIG.
A plurality of nodes 11, 12, 13, 14, 15 and subscriber group device groups 52, 53, 54, 55 such as telephones, facsimile machines, etc. connected to the respective nodes 12, 13, 14, 15.
And two optical transmission lines (optical fibers) for transmitting transmission data in opposite directions, and a monitoring device (SV device; SURVEILLANCE Equipment) for performing various monitoring of the optical transmission device 8
And have. Also, the nodes 11, 1
Of the nodes 2, 13, 14, and 15, the node 11 is a branch node as shown in FIG. 7, and the node 15 is an expansion node. Further, the monitoring device 8 has an operating unit 81, a display unit 82, a recording output unit 83, and a monitoring control unit 84, as shown in FIG.

FIG. 6 shows a node 12 according to the first embodiment.
The structure of (13, 15) is shown. As shown in the figure, in the node 12 (13, 15), an optical signal and an electrical signal are transmitted for transmission data formed from a management data area including a line layer, a section layer and a path layer, and a main data area used by a subscriber. LTEs (line layer terminators) 1w and 1e that perform signal conversion, monitoring of line layer errors, termination processing, and the like, and STS that performs reception of the path layer, termination processing according to instructions, and monitoring of fault information. -PTE
(Path layer terminator) 2w, 2e, PPM (error detection unit) 3w, 3e for detecting an error in the path layer of the received transmission data, and an optical transmission line for which an error in the path layer is not detected To connect to the subscriber system device group 52 (select an arbitrary side when neither is detected) and the STS path layer selecting section 4 and the error of the path layer are transmitted in mutually opposite directions. The one-sided error monitoring unit 6 that monitors whether or not the received transmission data is detected only in one of the path layers, and is selected when an error in the path layer is detected in only one of the transmission data. Tata's STS-PT
For E (path layer terminator) 2w, 2e, write a new path layer including transmission game alarm (Yellow), which is one of the failure information indicating that an error has been detected in the path layer, into the transmission data, The PTE2w, which is an instruction to be sent on the optical transmission line,
2E, a game alarm transmission instruction unit 7 which is a failure information transmission instruction unit 700, and an optical transmission line selected by the selection unit 4 and a subscriber system group 52 are provided to interpose the PTE.
It has an interface 50 for controlling the connection such as a termination instruction with respect to 2w and 2e.

FIG. 8 shows the branch node 11. The branch node 11 includes normal nodes 12 and 1
Unlike 3, 14, and 15, STS-PTEs 2w and 2e are not provided and the pass layer is not terminated. Also, STS
The path layer selection unit 4 selects the selected optical transmission line and extension node 15
The connection between and.

Next, the operation of the first embodiment will be described.
For example, the transmission data transmitted from the opposite station, which is the transmission source of the same origin, transmitted from the node 12 shown in FIG. 5 through the optical transmission line from the opposite directions of the CW (clockwise) direction and the CCW (counter clockwise). Is received by LTE 1w and 1e, the optical signal is converted into an electric signal, and the line layer is terminated. Further, the PTEs 2w and 2e receive a path layer, multiplex it, take in the path layer, perform predetermined processing,
An error is detected by the PPMs 3w and 3e.
At that time, if no error is detected in the transmission data from both transmission lines, either of them is arbitrarily selected and the optical transmission line and the subscriber group device group 52 are connected via the interface 50. Both STS-PTE2
A termination instruction is given to w and 2e, and the transmission data is transmitted with the information indicating that no error has been detected in the opposite directions. When an error is detected in the transmission data from only one of the optical transmission lines, the selecting unit 4 selects the one of the optical transmission lines in which no error is detected and connects it to the subscriber group device group 52. Let it end.

That is, the incorporated pass layer is, for example, displayed on the display unit 82 of the SVR 8 in various ways or subjected to various predetermined processes in response to an operation instruction from the operation unit 81, and then the subscriber system group or SV. When an instruction from the device 8 and an error are detected, a new path layer including a game alarm is created and sent back to the game that is the transmission source. At that time, it is assumed that the one-sided error monitoring unit 6 detects an error in the transmission data from only one optical transmission line. In this case, the game alarm transmission instruction unit 7 does not detect an error, and causes the path layer selected by the selection unit 4 to include a game alarm indicating that an error has been detected. In the same manner as the path layer in which the error is detected, the transmission instruction is given on the optical transmission line.

Therefore, even if a fault is detected only in the path layer of the transmission data transmitted through one optical transmission line, the transmission data is transmitted only through the optical transmission line in which no fault is detected. Instead, it will transmit both optical transmission lines. Therefore, in the optical transmission device having the ring network shown in FIG.
When transmission data having a path layer containing an error is received from the optical transmission line in the CW (CLOCKWISE) direction, in the conventional case, the optical transmission line in which no error is detected, that is, e
Transmission data including information indicating that no error has been detected is transmitted in the CCW direction on the side, and in the CW direction on the w side,
Transmission data including a game alarm indicating that an error has been detected is transmitted. At this time, for example, if the selecting unit 24 of the branch node 11 happens to receive only the optical transmission line on the w side, that is, the CCW direction, the optical transmission line and the expansion node on which the error is not detected are detected. 15 becomes a state of connection, and of the transmission data output from the node 12, only the transmission data that does not include a game alarm reaches the extension node 15, and the extension node 15
Will not be able to recognize the existence of path layer errors. However, in this embodiment, the node 12
Since the transmission data including the game alarm is transmitted not only to the optical transmission line in the direction in which no error is detected, but also to the optical transmission line in the direction in which an error is detected Also, the transmission data including the game alarm will be transmitted.

Next, a second embodiment will be described with reference to FIG. In this example, each node is different from that of the first example in that the STS path layer selecting unit 4 is not provided and, instead, the VTS that separates the STS path layer is provided.
VT-PTE32 that performs processing such as termination for the T path layer
w, 32e, and a receiving VT-PTE selecting unit 34 for connecting to the subscriber unit device group by selecting the optical transmission line in which an error is not detected in the received VT path layer, and the opposite directions. The VT one-error monitoring unit 36 that monitors whether or not an error is detected in the VT path layer of only one of the two types of transmission data transmitted and received by the VT, and the VT of the transmission data in which one of the transmission data has an error in the path layer. If detected only in the path layer,
VT-PTE 32w, 3 for which no error was detected
2e, the VT versus station alarm transmission instruction unit 37 for instructing to include on the new VT path layer, a versus station alarm, which is failure information that is information indicating that an error has been detected in the VT path layer, and to transmit it to the transmission path. And have. Where ST
The S pass layer and the VT pass layer are shown in FIG.

The operation of the second embodiment will be described next. As shown in FIG. 9, for example, the nodes 12 receive transmission data having the same origin transmitted from opposite directions via the optical transmission line by the LTEs 1w and 1e, and convert the optical signal into an electric signal. , Terminate the line layer. Also, the STS-PTE 2w, 2e receives the STS path layer,
Various processing is performed by incorporating the STS pass layer. Then, the SPM layer error is detected by the PPMs 3w and 3e. In this example, after detecting an error, the path layer is separated into a plurality of VT path layers, and the VT-P
The data is input to the TEs 32w and 32e, the VT path layer is taken in, and predetermined processing is performed. At the same time, the error is VT-PPM
33w, 33e, and the VT path layer selection unit 34
Will select the optical transmission line in which no error is detected and connect it to the subscriber group of devices. At that time, V
The T-one-side error monitoring unit 36 monitors whether or not an error is detected in the VT path layer of only one of the transmission data transmitted in the opposite directions on the optical transmission line, and the error of the VT path layer is detected in only one side. If detected in the transmitted data, the VT
The game alarm transmission instruction unit 37 issues a transmission instruction including a game alarm indicating that an error has been detected to the selected VT path layer without detecting an error. Therefore, the transmission data including the game alarm in the VT path layer are transmitted in the opposite directions to each other, and the game alarm is surely transmitted to the game.

Next, a third embodiment will be described with reference to FIG. In this example, unlike the first embodiment, the game selected by the reception STS path layer selection unit 4 is used instead of the one-sided error detection unit 6 and the game alarm transmission instruction unit 7 provided in the first embodiment. FEBE (Far End Block Error), which is fault information indicating the number of parity errors in the path layer, and an instruction to send the detected FEBE in both the STS path layer of the transmission data. And an FEBE sending instructing section 77 for carrying out.
Here, the FEBE is used to monitor the normal / abnormal state of the PPM, which is the error detection unit of the game.

Similarly to the first embodiment, for example, the node 12 shown in FIG. 5 is transmitted from the opposite station in the CW direction and the CCW direction, which are transmitted from the opposite directions to each other through the optical transmission line. LTE 1w, 1e receives the transmitted data,
The optical signal is converted into an electrical signal and the line layer is terminated. Further, the PTEs 2w and 2e receive the path layer, multiplex it, take in the path layer and perform a predetermined process, and the PPMs 3w and 3e detect an error. At that time, if no error is detected in the transmission data from both transmission lines, either of them is arbitrarily selected and the optical transmission line and the subscriber group device group 52 are connected via the interface 50. And both STS-PTE2w, 2
The e is instructed to terminate, and the transmission data is transmitted with the information indicating that no error has been detected in the opposite directions. When an error is detected in the transmission data from only one optical transmission line, the selecting unit 4
Selects the optical transmission line in which no error is detected, connects it with the subscriber group device group 52, and terminates it. In this way, when the optical transmission path is selected by the reception STS path layer selection unit 4, the FEBE detection unit 71 detects the FEBE in the selected STS path layer, and the FEBE.
The sending instructing unit 77 causes the FEBE to be included in the path layer not only in the path layer selected without detecting an error but also in the path layer not selected due to the error being detected, etc. Instructions for transmission will be given. As a result, it is possible to monitor the normality and abnormality of the PPM that monitors the error.

Further, a fourth embodiment will be described with reference to FIG. As shown in the figure, this example is different from the second example in place of the VT one-sided error detection section 36 and the VT versus station alarm transmission instruction section 37, and the VT-FEBE detection section 8
6 and a VT-FEBE sending instruction unit 87. The VT-FEBE detection unit 86 is detected as an FEBE detection unit 71 that detects FEBE that is failure information indicating the number of parity errors in the VT path layer of the game selected by the VT reception path layer selection unit 34. The FEBE transmission instruction unit 77 includes FEBE in both the VT path layer of transmission data to instruct the transmission. This example differs from the third example in that the VT path layer selector 3
The FEBE for the VT path layer selected in step 4 is detected, and the VT-FEBE transmission instructing unit 87 instructs the transmission of transmission data for both optical transmission lines.

[0025]

As described above, according to the present invention, not only the optical transmission line in which a failure is detected, but also the optical transmission line in which a failure is detected transmits transmission data including failure information such as a game alarm. I am trying to do it. Therefore, even when an optical transmission device having a ring network includes an expansion node, it is possible to transmit the transmission data including the failure information such as a game alarm to the expansion node, so that it is possible to immediately respond to the failure. Correspondingly, it is possible to rapidly overcome the obstacle and provide a reliable optical transmission device.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the first invention.

FIG. 2 is a principle flowchart according to the second invention.

FIG. 3 is a block diagram of the principle of the third invention.

FIG. 4 is a flow chart of the principle of the fourth invention.

FIG. 5 is an overall block diagram according to an embodiment (conventional example).

FIG. 6 is a block diagram showing a normal node according to the first embodiment.

FIG. 7 is a block diagram showing transmission data according to an embodiment (conventional example).

FIG. 8 is a block diagram showing a normal node according to a second embodiment.

FIG. 9 is a block diagram showing a branch node according to an embodiment (conventional example).

FIG. 10 is a block diagram showing a node according to a third embodiment.

FIG. 11 is a block diagram showing a node according to a fourth embodiment.

FIG. 12 is a block diagram showing a node according to a conventional example.

[Explanation of symbols]

100w, 100e, 1w, 1e Line layer termination device 200w, 200e (2w, 2e, 32w, 32e)
Path layer terminating device (STS-PTE, VT-PTE) 300w, 300e (3w, 3e) Error detection unit (P
PM) 400 (4, 34) Reception path layer selection unit (reception STS path layer selection unit, reception VT path layer selection unit) 600,6 One-sided error monitoring unit 700,7 Failure information transmission instruction unit (game alarm transmission instruction unit)

Claims (4)

[Claims] 1. A transmission data formed from a management data area including a line layer, a section layer and a path layer and a main data area used by a subscriber, conversion between an optical signal and an electric signal, and an error in the line layer. Line layer terminating equipment (100w, 100e) for monitoring and terminating
And a path layer terminating device (200w, 200e) for receiving a path layer, terminating by an instruction, detecting fault information, and the like.
And an error detection unit (300w, 300e) that detects an error in the path layer of the received transmission data, and an optical transmission path in which an error in the path layer is not detected is selected to form a group of subscriber system devices. In an optical transmission device having an annular network in which each node having a path layer selection unit (400) to be connected is connected by two optical transmission lines in which transmission directions of transmission data are opposite to each other, received transmission One-sided error monitoring unit (600) that monitors whether or not an error is detected in the path layer of only one optical transmission line of the data, and only the path layer received from the optical transmission line of one system When an error is detected, the path layer terminator (200w, 200e) on which the error is not detected is also
A fault information sending instruction unit (700) for instructing to include fault information, which is information indicating that an error has been detected in the path layer, in a new path layer and to send it to the optical transmission line. Failure information transmission method for optical transmission equipment with ring network. 2. A management data area including a line layer, a section layer and a path layer, which is transmitted through each of the nodes via two optical transmission lines whose transmission directions are opposite to each other, and a subscriber. When it receives the transmission data formed from the main data area to be used, it converts between the optical signal and the electrical signal and monitors the line layer and the path layer for errors, termination processing by instruction, multiplexing processing, and failure information It has a ring network that performs detection, etc. (S1), selects the optical transmission line of the system in which no error is detected in the path layer and connects it to the subscriber device group (S2), and terminates the path layer according to an instruction. In the optical transmission equipment, it is monitored whether or not an error is detected in the path layer received by the optical transmission path of only one system of the transmission data transmitted through the two optical transmission path strips, and the error of the path layer is monitored. Is detected in only one of the transmission data (S3), no error is detected, and fault information indicating that an error has been detected is also added to the new path layer in the selected path layer. In addition, the fault information transmission method of the optical transmission device having a ring network is characterized in that it is instructed to be sent out on the optical transmission line and transmitted to the opposite station (S4). 3. A transmission data formed from a management data area including a line layer, a section layer and a path layer, and a main data area used by a subscriber, conversion between an optical signal and an electric signal, and an error of the line layer. Line layer terminating equipment (100w, 100e) for monitoring and terminating
And a path layer terminating device (200w, 200e) for receiving a path layer, terminating by an instruction, detecting fault information, and the like.
And an error detection unit (300w, 300e) that detects an error in the path layer of the received transmission data, and an optical transmission path in which an error in the path layer is not detected is selected to form a group of subscriber system devices. In an optical transmission device having an annular network in which each node having a path layer selection unit (400) to be connected is connected by two optical transmission paths in which transmission directions of transmission data are opposite to each other, the reception path layer selection F which is the failure information indicating the number of parity errors in the path layer of the game selected by the section (400)
An FEBE detection unit (710) for detecting EBE, and an FEB for instructing transmission by including the detected FEBE in a path layer of transmission data transmitted through two optical transmission lines.
A fault information transmission system for an optical transmission device having a ring network, comprising an E transmission instruction section (770). 4. A management data area including a line layer, a section layer, and a path layer, which is transmitted via each of two nodes of optical transmission paths in which transmission directions of transmission data are opposite to each other, and a subscriber When it receives the transmission data formed from the main data area to be used, it converts between the optical signal and the electrical signal and monitors the line layer and the path layer for errors, termination processing by instruction, multiplexing processing, and failure information It has a ring network that performs detection, etc. (S1), selects the optical transmission line of the system in which no error is detected in the path layer and connects it to the subscriber device group (S2), and terminates the path layer according to an instruction. In the optical transmission device, failure information indicating the number of parity errors in the path layer, which is selected as an error not being detected and is received via the optical transmission line connected to the subscriber system device group. Performs detection of a FEBE (S13), it is contained in the path layer of the transmission data for transmitting the optical transmission path of the detected the FEBE dual instructs delivery to (S
14) A fault information transmission method for an optical transmission device having a ring network, characterized in that